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Activités et modèle de dispersion de Daubentonia madagascariensis (Gmelin, 1788) male dans la foret classée de Kianjavato, Sud-Est de Madagascar / Roger Doménico RANDIMBIHARINIRINA
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Titre : Activités et modèle de dispersion de Daubentonia madagascariensis (Gmelin, 1788) male dans la foret classée de Kianjavato, Sud-Est de Madagascar Type de document : texte imprimé Auteurs : Roger Doménico RANDIMBIHARINIRINA, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2015 Importance : 46 p. Présentation : 97 réf.; 21 tab.; 2 tab. Note générale : Diplome d'Etudes Approfondies Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIEN NOCTURNE DAUBENTONIA MADAGASCARIENSIS ECOLOGIE KIANJAVATO, SUD-EST DE MADAGASCAR Résumé : Cette étude a été effectuée dans la Forêt Classée de Kianjavato, au Sud-est de Madagascar. Elle a duré
un an : Octobre 2013 - Octobre 2014. Elle a pour but de compléter les informations sur l’histoire
naturelle de Daubentonia madagascariensis. Deux individus mâles ont fait l’objet de notre étude. Pour
atteindre les objectifs spécifiques, plusieurs méthodes ont été utilisées telles que : la « radio tracking » et
le « focal animal sampling » pour déterminer les activités des individus ; et la méthode du « Minimum
Convex Polygon » pour étudier le modèle de leur dispersion dans leur habitat.
Les résultats ont montré que le mâle de Daubentonia madagascariensis consacre la majorité de
son temps à s’alimenter et à se déplacer. Comparée à d’autres espèces de lémurien, il ne se repose que
pendant très peu de temps. Sa nourriture est principalement composée de larves, de graines de Canarium
madagascariensis et de Canarium boivinii et d’insectes. Il complète son régime alimentaire avec du
nectar de Ravenala madagascariensis. Il montre une préférence significative envers les larves. Les Ayeaye mâles dénichent ces derniers dans des branches d’arbres partiellement mortes, des arbres morts et
dans des troncs de bambou adulte. Pourtant, ils cherchent les insectes dans les fleurs sèches de Ravenala
madagascariensis et au niveau des branches de Dypsis linea. Le territoire des deux individus occupe
respectivement une superficie de 974 Ha et de 822 Ha. Ils se chevauchent entre eux ; et l’un recouvre
presque en totalité celui d’une femelle. Leur territoire semble être délimité par les sources de larve dans
la forêt. Et la dispersion des mâles dans son habitat ne dépend uniquement pas de la répartition spatiale
de leur nourriture. Elle pourrait être aussi liée à d’autres facteurs, comme la recherche d’une femelle.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/randimbiharinirinaRogerD_SN_M2_15.pdf Activités et modèle de dispersion de Daubentonia madagascariensis (Gmelin, 1788) male dans la foret classée de Kianjavato, Sud-Est de Madagascar [texte imprimé] / Roger Doménico RANDIMBIHARINIRINA, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2015 . - 46 p. : 97 réf.; 21 tab.; 2 tab.
Diplome d'Etudes Approfondies
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIEN NOCTURNE DAUBENTONIA MADAGASCARIENSIS ECOLOGIE KIANJAVATO, SUD-EST DE MADAGASCAR Résumé : Cette étude a été effectuée dans la Forêt Classée de Kianjavato, au Sud-est de Madagascar. Elle a duré
un an : Octobre 2013 - Octobre 2014. Elle a pour but de compléter les informations sur l’histoire
naturelle de Daubentonia madagascariensis. Deux individus mâles ont fait l’objet de notre étude. Pour
atteindre les objectifs spécifiques, plusieurs méthodes ont été utilisées telles que : la « radio tracking » et
le « focal animal sampling » pour déterminer les activités des individus ; et la méthode du « Minimum
Convex Polygon » pour étudier le modèle de leur dispersion dans leur habitat.
Les résultats ont montré que le mâle de Daubentonia madagascariensis consacre la majorité de
son temps à s’alimenter et à se déplacer. Comparée à d’autres espèces de lémurien, il ne se repose que
pendant très peu de temps. Sa nourriture est principalement composée de larves, de graines de Canarium
madagascariensis et de Canarium boivinii et d’insectes. Il complète son régime alimentaire avec du
nectar de Ravenala madagascariensis. Il montre une préférence significative envers les larves. Les Ayeaye mâles dénichent ces derniers dans des branches d’arbres partiellement mortes, des arbres morts et
dans des troncs de bambou adulte. Pourtant, ils cherchent les insectes dans les fleurs sèches de Ravenala
madagascariensis et au niveau des branches de Dypsis linea. Le territoire des deux individus occupe
respectivement une superficie de 974 Ha et de 822 Ha. Ils se chevauchent entre eux ; et l’un recouvre
presque en totalité celui d’une femelle. Leur territoire semble être délimité par les sources de larve dans
la forêt. Et la dispersion des mâles dans son habitat ne dépend uniquement pas de la répartition spatiale
de leur nourriture. Elle pourrait être aussi liée à d’autres facteurs, comme la recherche d’une femelle.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/randimbiharinirinaRogerD_SN_M2_15.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics / Vasey, N.
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Titre : Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics Type de document : texte imprimé Auteurs : Vasey, N., Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS ENERGY CONSERVATION ENERGY ACCUMULATION CIRCADIAN RHYTMS SEX DIFFERENCES Résumé : The activity budgets and daily activity rhythms of Varecia rubra were examined over an annual cycle according to season and reproductive stage. Given the relatively high reproductive costs and patchy food resources of this species, I predicted that V. rubra would 1) travel less and feed more during seasonal resource scarcity in an attempt to maintain energy balance, and 2) show sex differences in activity budgets due to differing reproductive investment. Contrary to the first prediction, V. rubra does not increase feeding time during seasonal food scarcity; rather, females feed for a consistent amount of time in every season, whereas males feed most during the resource-rich, hot dry season. The results are consistent with other predictions: V. rubra travels less in the resource-scarce cold rainy season, and there are some pronounced sex differences, with females feeding more and resting less than males in every season and in every reproductive stage except gestation. However, there are also some provocative similarities between the sexes when activity budgets are examined by reproductive stage. During gestation, female and male activity budgets do not differ and appear geared toward energy accumulation: both sexes feed and rest extensively and travel least during this stage. During lactation, activity budgets are geared toward high energy expenditure: both sexes travel most and in equal measure, and rest least, although it remains the case that females feed more and rest less than males. These similarities between female and male activity budgets appear related to cooperative infant care. The high energetic costs of reproduction in V. rubra females may require that they allot more time to feeding year round, and that their overall activity budget be more directly responsive to seasonal climate change, seasonal food distribution, and reproductive schedules Titre du périodique : American Journal of Primatology Volume : 66: 23-44 En ligne : https://doi.org/10.1002/ajp.20126 Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics [texte imprimé] / Vasey, N., Auteur . - 2005.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS ENERGY CONSERVATION ENERGY ACCUMULATION CIRCADIAN RHYTMS SEX DIFFERENCES Résumé : The activity budgets and daily activity rhythms of Varecia rubra were examined over an annual cycle according to season and reproductive stage. Given the relatively high reproductive costs and patchy food resources of this species, I predicted that V. rubra would 1) travel less and feed more during seasonal resource scarcity in an attempt to maintain energy balance, and 2) show sex differences in activity budgets due to differing reproductive investment. Contrary to the first prediction, V. rubra does not increase feeding time during seasonal food scarcity; rather, females feed for a consistent amount of time in every season, whereas males feed most during the resource-rich, hot dry season. The results are consistent with other predictions: V. rubra travels less in the resource-scarce cold rainy season, and there are some pronounced sex differences, with females feeding more and resting less than males in every season and in every reproductive stage except gestation. However, there are also some provocative similarities between the sexes when activity budgets are examined by reproductive stage. During gestation, female and male activity budgets do not differ and appear geared toward energy accumulation: both sexes feed and rest extensively and travel least during this stage. During lactation, activity budgets are geared toward high energy expenditure: both sexes travel most and in equal measure, and rest least, although it remains the case that females feed more and rest less than males. These similarities between female and male activity budgets appear related to cooperative infant care. The high energetic costs of reproduction in V. rubra females may require that they allot more time to feeding year round, and that their overall activity budget be more directly responsive to seasonal climate change, seasonal food distribution, and reproductive schedules Titre du périodique : American Journal of Primatology Volume : 66: 23-44 En ligne : https://doi.org/10.1002/ajp.20126 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics / Vasey, N.
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Titre : Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics Type de document : texte imprimé Auteurs : Vasey, N., Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS ENERGY CONSERVATION ENERGY ACCUMULATION CIRCADIAN RHYTHMS SEX DIFFERENCES Résumé : The activity budgets and daily activity rhythms of Varecia rubra were examined over an annual cycle according to season and reproductive stage. Given the relatively high reproductive costs and patchy food resources of this species, I predicted that V. rubra would 1) travel less and feed more during seasonal resource scarcity in an attempt to maintain energy balance, and 2) show sex differences in activity budgets due to differing reproductive investment. Contrary to the first prediction, V. rubra does not increase feeding time during seasonal food scarcity; rather, females feed for a consistent amount of time in every season, whereas males feed most during the resource-rich, hot dry season. The results are consistent with other predictions: V. rubra travels less in the resource-scarce cold rainy season, and there are some pronounced sex differences, with females feeding more and resting less than males in every season and in every reproductive stage except gestation. However, there are also some provocative similarities between the sexes when activity budgets are examined by reproductive stage. During gestation, female and male activity budgets do not differ and appear geared toward energy accumulation: both sexes feed and rest extensively and travel least during this stage. During lactation, activity budgets are geared toward high energy expenditure: both sexes travel most and in equal measure, and rest least, although it remains the case that females feed more and rest less than males. These similarities between female and male activity budgets appear related to cooperative infant care. The high energetic costs of reproduction in V. rubra females may require that they allot more time to feeding year round, and that their overall activity budget be more directly responsive to seasonal climate change, seasonal food distribution, and reproductive schedules Titre du périodique : American Journal of Primatology Volume : 66: 23-44 En ligne : https://doi.org/10.1002/ajp.20126 Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics [texte imprimé] / Vasey, N., Auteur . - 2005.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS ENERGY CONSERVATION ENERGY ACCUMULATION CIRCADIAN RHYTHMS SEX DIFFERENCES Résumé : The activity budgets and daily activity rhythms of Varecia rubra were examined over an annual cycle according to season and reproductive stage. Given the relatively high reproductive costs and patchy food resources of this species, I predicted that V. rubra would 1) travel less and feed more during seasonal resource scarcity in an attempt to maintain energy balance, and 2) show sex differences in activity budgets due to differing reproductive investment. Contrary to the first prediction, V. rubra does not increase feeding time during seasonal food scarcity; rather, females feed for a consistent amount of time in every season, whereas males feed most during the resource-rich, hot dry season. The results are consistent with other predictions: V. rubra travels less in the resource-scarce cold rainy season, and there are some pronounced sex differences, with females feeding more and resting less than males in every season and in every reproductive stage except gestation. However, there are also some provocative similarities between the sexes when activity budgets are examined by reproductive stage. During gestation, female and male activity budgets do not differ and appear geared toward energy accumulation: both sexes feed and rest extensively and travel least during this stage. During lactation, activity budgets are geared toward high energy expenditure: both sexes travel most and in equal measure, and rest least, although it remains the case that females feed more and rest less than males. These similarities between female and male activity budgets appear related to cooperative infant care. The high energetic costs of reproduction in V. rubra females may require that they allot more time to feeding year round, and that their overall activity budget be more directly responsive to seasonal climate change, seasonal food distribution, and reproductive schedules Titre du périodique : American Journal of Primatology Volume : 66: 23-44 En ligne : https://doi.org/10.1002/ajp.20126 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Adaptations in the Aye-aye: A review Type de document : texte imprimé Auteurs : Eleanor J. Sterling, Auteur ; Erin E McCreless, Auteur Editeur : New York, NY [USA] : Springer Année de publication : 2006 Importance : p. 159–184 ISBN/ISSN/EAN : 978-0-387-34586-4 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HOME RANGE MIDDLE FINGER SEXUAL SIZE DIMORPHISM ESTROUS FEMALE GRAY MOUSE LEMUR En ligne : https://doi.org/10.1007/978-0-387-34586-4_8 Adaptations in the Aye-aye: A review [texte imprimé] / Eleanor J. Sterling, Auteur ; Erin E McCreless, Auteur . - New York, NY [USA] : Springer, 2006 . - p. 159–184.
ISBN : 978-0-387-34586-4
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HOME RANGE MIDDLE FINGER SEXUAL SIZE DIMORPHISM ESTROUS FEMALE GRAY MOUSE LEMUR En ligne : https://doi.org/10.1007/978-0-387-34586-4_8 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Arrived in the light: Diet and seasonal activity patterns in wild verreaux's sifaks (Propithecus v; verreauxi; Primates: Indriidae) / Erkert, H. G., Kappeler, P.M.
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Titre : Arrived in the light: Diet and seasonal activity patterns in wild verreaux's sifaks (Propithecus v; verreauxi; Primates: Indriidae) Type de document : texte imprimé Auteurs : Erkert, H. G., Kappeler, P.M., Auteur Année de publication : 2004 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY PATTERN CIRCADIAN RYTHM SEASONALITY DIURNALITY PROPITHECUS Résumé : Madagascar is characterised by pronounced annual climatic and ecological seasonality and harbours a radiation of closely related sympatric primates (Lemuriformes) that exhibit diurnal, nocturnal and cathemeral activity patterns. We collected continuous activity data over a complete annual cycle from wild diurnal Verreaux’s sifakas (Propithecus v. verreauxi) to contribute detailed and comparative data: (1) to characterise their diel and seasonal activity rhythms, (2) to identify factors shaping variation in activity rhythms, and (3) to help reconstruct the evolutionary transition from nocturnal to diurnal activity. We fitted eight adult sifakas from seven different groups living in Kirindy forest with an accelerometer/data logger device and recorded their activity in 5-min bins for a total of 12 months. We characterise P. verreauxi as a strictly diurnal species with a pronounced bimodal activity pattern that briefly changed to a more unimodal pattern during their annual mating season (January to March). We documented significant annual variation in total daily activity, activity time, and activity level, as well as in most parameters characterising their bimodal activity pattern. Despite a significant positive correlation of the animals’ activity time with day length, pronounced annual variation in the phase position of onset and end of activity in relation to sunrise and sunset times could also be discerned. Minor enhancing effects of moonlight on nocturnal activity were only found for the first 3 h of the inactivity period. Bimodality of the activity pattern and the additional reduction of activity time during the cold and dry winter months associated with reduced food availability can be interpreted as flexible behavioural adaptations to reduce energy expenditure. We therefore propose that energetic and thermoregulatory benefits are important factors shaping these primates’ activity pattern. Titre du périodique : Behavioral Ecology and Sociobiology Volume : 57: 174-186 En ligne : https://doi.org/10.1007/s00265-004-0845-y Arrived in the light: Diet and seasonal activity patterns in wild verreaux's sifaks (Propithecus v; verreauxi; Primates: Indriidae) [texte imprimé] / Erkert, H. G., Kappeler, P.M., Auteur . - 2004.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY PATTERN CIRCADIAN RYTHM SEASONALITY DIURNALITY PROPITHECUS Résumé : Madagascar is characterised by pronounced annual climatic and ecological seasonality and harbours a radiation of closely related sympatric primates (Lemuriformes) that exhibit diurnal, nocturnal and cathemeral activity patterns. We collected continuous activity data over a complete annual cycle from wild diurnal Verreaux’s sifakas (Propithecus v. verreauxi) to contribute detailed and comparative data: (1) to characterise their diel and seasonal activity rhythms, (2) to identify factors shaping variation in activity rhythms, and (3) to help reconstruct the evolutionary transition from nocturnal to diurnal activity. We fitted eight adult sifakas from seven different groups living in Kirindy forest with an accelerometer/data logger device and recorded their activity in 5-min bins for a total of 12 months. We characterise P. verreauxi as a strictly diurnal species with a pronounced bimodal activity pattern that briefly changed to a more unimodal pattern during their annual mating season (January to March). We documented significant annual variation in total daily activity, activity time, and activity level, as well as in most parameters characterising their bimodal activity pattern. Despite a significant positive correlation of the animals’ activity time with day length, pronounced annual variation in the phase position of onset and end of activity in relation to sunrise and sunset times could also be discerned. Minor enhancing effects of moonlight on nocturnal activity were only found for the first 3 h of the inactivity period. Bimodality of the activity pattern and the additional reduction of activity time during the cold and dry winter months associated with reduced food availability can be interpreted as flexible behavioural adaptations to reduce energy expenditure. We therefore propose that energetic and thermoregulatory benefits are important factors shaping these primates’ activity pattern. Titre du périodique : Behavioral Ecology and Sociobiology Volume : 57: 174-186 En ligne : https://doi.org/10.1007/s00265-004-0845-y Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire A comparison of activity patterns for captive Propithecus tattersalli and Propithecus coquereli / Gregory L. Wallace
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Titre : A comparison of activity patterns for captive Propithecus tattersalli and Propithecus coquereli Type de document : texte imprimé Auteurs : Gregory L. Wallace, Auteur ; Lisa B. Paquette, Auteur ; Kenneth E. Glander, Auteur Année de publication : 2016 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEMALE DOMINANCEN LEMUR GOLDEN-CROWNED SIFAKA SOCIAL BEHAVIOR COQUEREL'S SIFAKA ALLOGROMMING Résumé : The activity patterns and social interactions of two species of captive sifaka were observed during a 2-year period. Allogrooming was not observed in golden-crowned sifaka and they spent significantly more time resting than the Coquerel's sifaka. Females of both species were found to be dominant to males. The golden-crowned sifaka (Propithecus tattersalli) spent significantly less time feeding than the Coquerel's sifaka. Temperature, time of day, species, and interpair comparisons for the golden-crowned sifaka were found to affect activity and social interactions, while gender did not. Like the Coquerel's sifaka, the golden-crowned sifaka was found to be diurnal; however, they differed in that the golden-crowned sifaka did not descend to the ground Titre du périodique : Zoo Biology Volume : 35:128-136 En ligne : https://doi.org/10.1002/zoo.21258 A comparison of activity patterns for captive Propithecus tattersalli and Propithecus coquereli [texte imprimé] / Gregory L. Wallace, Auteur ; Lisa B. Paquette, Auteur ; Kenneth E. Glander, Auteur . - 2016.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEMALE DOMINANCEN LEMUR GOLDEN-CROWNED SIFAKA SOCIAL BEHAVIOR COQUEREL'S SIFAKA ALLOGROMMING Résumé : The activity patterns and social interactions of two species of captive sifaka were observed during a 2-year period. Allogrooming was not observed in golden-crowned sifaka and they spent significantly more time resting than the Coquerel's sifaka. Females of both species were found to be dominant to males. The golden-crowned sifaka (Propithecus tattersalli) spent significantly less time feeding than the Coquerel's sifaka. Temperature, time of day, species, and interpair comparisons for the golden-crowned sifaka were found to affect activity and social interactions, while gender did not. Like the Coquerel's sifaka, the golden-crowned sifaka was found to be diurnal; however, they differed in that the golden-crowned sifaka did not descend to the ground Titre du périodique : Zoo Biology Volume : 35:128-136 En ligne : https://doi.org/10.1002/zoo.21258 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Comportement alimentaire et recensement de Phaner pallescens (Grove & Tattersall, 1991) dans l'aire protegée complexe Tsimembo Manambolomaty / Tojonirina Patrick Rafalimanana
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Titre : Comportement alimentaire et recensement de Phaner pallescens (Grove & Tattersall, 1991) dans l'aire protegée complexe Tsimembo Manambolomaty Type de document : texte imprimé Auteurs : Tojonirina Patrick Rafalimanana, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2022 Importance : 50 p. Présentation : 60 réf. ; 13 ill.; 9 tab. Note générale : Master II Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENT ALIMENTAIRE DENSITE PHANER PALLESCENS, PASSIVE ACOUSTIC MONITORING COMPLEXE TSIMEMBO MANAMBOLOMATY Résumé : Une étude visant à connaître le comportement alimentaire et la densité de population de Phaner pallescens a été
effectuée dans l’Aire Protégée Complexe Tsimembo Manambolomaty, dans le Centre Ouest de Madagascar, durant les mois
d’octobre et novembre 2019. La collecte de données comportementales utilisant la méthode « continuous focal animal
sampling » a été faite sur deux couples. Pendant les observations, les types de nourritures et les espèces de plantes consommées par ces individus focaux ont été identifiés. Aussi, les temps que passent les individus sur chaque type de nourriture et sur chaque espèce de plante nourricière ont été enregistrés. Pour le recensement des individus, des observations sur lignes de transects ont été effectuées. Huit lignes de transect de 1 km chacun ont été visitées dans six sites. Une visite s’effectue entre 18 h 45 et 21 h 00 et chaque transect a été visité en moyenne quatre fois pendant l’étude. De plus, des enregistrements de son selon la méthode « Passive Acoustic Monitoring », ont été effectués sur 10 endroits où les individus ont été observés ou entendus par leur vocalisation sur ces transects. Les résultats ont montré que les individus de Phaner pallescens passent la plus grande partie de leur temps d’alimentation à consommer des gommes (74 %), ils mangent aussi des fleurs (14 %) et lèchent des feuilles d’arbres (12 %) (N = 4 individus). Ils passent environ 57,77 % de leur temps d’alimentation sur l’espèce d’arbre Terminalia calcicola. La densité de population de Phaner pallescens est estimée à 156 individus/km² (N = 6 sites ; ?
= 144) à partir du recensement sur ligne de transect. Cette densité est relativement élevée comparée à celles trouvées dans d’autres zones hébergeant cette espèce. Par ailleurs, la quantité moyenne des séries de cris obtenus (156,6 séries de cris/nuit ; N = 10 enregistrements ; ? = 92) dans les enregistrements a permis d’avoir une estimation de 47 individus/km² (N =10 enregistrements ; ? = 27). Ainsi, avec ces informations, cette étude pourrait constituer une base pour des études approfondies sur la biologie et l’écologie de cette espèce surtout dans l’AP Complexe Tsimembo ManambolomatyEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rafalimananaTojonirinaP_SN_MAST_22.pdf Comportement alimentaire et recensement de Phaner pallescens (Grove & Tattersall, 1991) dans l'aire protegée complexe Tsimembo Manambolomaty [texte imprimé] / Tojonirina Patrick Rafalimanana, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2022 . - 50 p. : 60 réf. ; 13 ill.; 9 tab.
Master II
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENT ALIMENTAIRE DENSITE PHANER PALLESCENS, PASSIVE ACOUSTIC MONITORING COMPLEXE TSIMEMBO MANAMBOLOMATY Résumé : Une étude visant à connaître le comportement alimentaire et la densité de population de Phaner pallescens a été
effectuée dans l’Aire Protégée Complexe Tsimembo Manambolomaty, dans le Centre Ouest de Madagascar, durant les mois
d’octobre et novembre 2019. La collecte de données comportementales utilisant la méthode « continuous focal animal
sampling » a été faite sur deux couples. Pendant les observations, les types de nourritures et les espèces de plantes consommées par ces individus focaux ont été identifiés. Aussi, les temps que passent les individus sur chaque type de nourriture et sur chaque espèce de plante nourricière ont été enregistrés. Pour le recensement des individus, des observations sur lignes de transects ont été effectuées. Huit lignes de transect de 1 km chacun ont été visitées dans six sites. Une visite s’effectue entre 18 h 45 et 21 h 00 et chaque transect a été visité en moyenne quatre fois pendant l’étude. De plus, des enregistrements de son selon la méthode « Passive Acoustic Monitoring », ont été effectués sur 10 endroits où les individus ont été observés ou entendus par leur vocalisation sur ces transects. Les résultats ont montré que les individus de Phaner pallescens passent la plus grande partie de leur temps d’alimentation à consommer des gommes (74 %), ils mangent aussi des fleurs (14 %) et lèchent des feuilles d’arbres (12 %) (N = 4 individus). Ils passent environ 57,77 % de leur temps d’alimentation sur l’espèce d’arbre Terminalia calcicola. La densité de population de Phaner pallescens est estimée à 156 individus/km² (N = 6 sites ; ?
= 144) à partir du recensement sur ligne de transect. Cette densité est relativement élevée comparée à celles trouvées dans d’autres zones hébergeant cette espèce. Par ailleurs, la quantité moyenne des séries de cris obtenus (156,6 séries de cris/nuit ; N = 10 enregistrements ; ? = 92) dans les enregistrements a permis d’avoir une estimation de 47 individus/km² (N =10 enregistrements ; ? = 27). Ainsi, avec ces informations, cette étude pourrait constituer une base pour des études approfondies sur la biologie et l’écologie de cette espèce surtout dans l’AP Complexe Tsimembo ManambolomatyEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rafalimananaTojonirinaP_SN_MAST_22.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Contribution à la revision systematique de deux genres d'Indriidae (Avahi, Jordan 1834 et Propithecus, Bennett 1832) de la cote Est de Madagascar / Volasoa Nicole Andriaholinirina
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Titre : Contribution à la revision systematique de deux genres d'Indriidae (Avahi, Jordan 1834 et Propithecus, Bennett 1832) de la cote Est de Madagascar Type de document : texte imprimé Auteurs : Volasoa Nicole Andriaholinirina, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2006 Importance : 135 p. Présentation : 87 réf.; 22 ill.; 25 tab. Note générale : Thèse de Doctorat Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS MADAGASCAR AVAHI PROPITHECUS SYSTEMATIQUE CYTOGENETIQUE, BIOLOGIE MOLECULAIRE BARRIERE GEOGRAPHIQUE Résumé : Une étude morphologique et génétique de différentes populations de deux genres
d’Indriidae de l’île de Madagascar – Avahi et Propithecus – a été réalisée. Des prélèvements
ont été effectués sur des animaux répartis dans les forêts de l’est de l’Île. Les animaux
capturés ont été photographiés, pesés et mesurés pour des comparaisons morphologiques.
Pour chaque animal, le caryotype a été déterminé, et le cyt-b et la D-loop sur l’ADN
mitochondrial, ont été séquencés. La comparaison des séquences a permis de calculer la
distance génétique séparant différentes populations et d’établir une phylogénie. Pour Avahi,
seuls les marqueurs moléculaires différencient nettement deux populations susceptibles d’être
considérées comme des espèces différentes si ces résultats sont confirmés sur un
échantillonnage plus important. A l’intérieur de chacune de ces deux populations les mêmes
marqueurs ont encore permis d’isoler deux sous-populations. Aucune différence
chromosomique n’a été décelée au sein des Avahi de l’est et les différences morphologiques
se sont révélées discrètes. Pour Propithecus, seul P. edwardsi est défini à la fois par des
caractères morphologiques distincts, une formule chromosomique spécifique et des
caractéristiques moléculaires et doit être considéré comme une espèce. Au vu des résultats
moléculaires obtenus à partir d’un faible échantillonnage et des données cytogénétiques le
statut spécifique de P. candidus, P. diadema et P. perrieri a été considéré comme discutable.
Le rôle des fleuves Mangoro et Onive qui marquent la frontière entre P. diadema et P.
edwardsi, ainsi qu’entre les deux taxons issus de A. laniger, a été discuté. L’importance de la
révision taxonomique pour la définition de la répartition et la mise en œuvre d'une politique
de protection a été discutée.En ligne : http://biblio.univ-antananarivo.mg/pdfs/andriaholinirinavn_sn_dnr_06.pdf Contribution à la revision systematique de deux genres d'Indriidae (Avahi, Jordan 1834 et Propithecus, Bennett 1832) de la cote Est de Madagascar [texte imprimé] / Volasoa Nicole Andriaholinirina, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2006 . - 135 p. : 87 réf.; 22 ill.; 25 tab.
Thèse de Doctorat
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS MADAGASCAR AVAHI PROPITHECUS SYSTEMATIQUE CYTOGENETIQUE, BIOLOGIE MOLECULAIRE BARRIERE GEOGRAPHIQUE Résumé : Une étude morphologique et génétique de différentes populations de deux genres
d’Indriidae de l’île de Madagascar – Avahi et Propithecus – a été réalisée. Des prélèvements
ont été effectués sur des animaux répartis dans les forêts de l’est de l’Île. Les animaux
capturés ont été photographiés, pesés et mesurés pour des comparaisons morphologiques.
Pour chaque animal, le caryotype a été déterminé, et le cyt-b et la D-loop sur l’ADN
mitochondrial, ont été séquencés. La comparaison des séquences a permis de calculer la
distance génétique séparant différentes populations et d’établir une phylogénie. Pour Avahi,
seuls les marqueurs moléculaires différencient nettement deux populations susceptibles d’être
considérées comme des espèces différentes si ces résultats sont confirmés sur un
échantillonnage plus important. A l’intérieur de chacune de ces deux populations les mêmes
marqueurs ont encore permis d’isoler deux sous-populations. Aucune différence
chromosomique n’a été décelée au sein des Avahi de l’est et les différences morphologiques
se sont révélées discrètes. Pour Propithecus, seul P. edwardsi est défini à la fois par des
caractères morphologiques distincts, une formule chromosomique spécifique et des
caractéristiques moléculaires et doit être considéré comme une espèce. Au vu des résultats
moléculaires obtenus à partir d’un faible échantillonnage et des données cytogénétiques le
statut spécifique de P. candidus, P. diadema et P. perrieri a été considéré comme discutable.
Le rôle des fleuves Mangoro et Onive qui marquent la frontière entre P. diadema et P.
edwardsi, ainsi qu’entre les deux taxons issus de A. laniger, a été discuté. L’importance de la
révision taxonomique pour la définition de la répartition et la mise en œuvre d'une politique
de protection a été discutée.En ligne : http://biblio.univ-antananarivo.mg/pdfs/andriaholinirinavn_sn_dnr_06.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective / Lisa Gould
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Titre : Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective Type de document : texte imprimé Auteurs : Lisa Gould, Auteur ; R.W. Sussman, Auteur ; Michelle L. Sauther, Auteur Année de publication : 2003 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : POPULATION CHANGE FECUNTIDY INFANT MORTALITY LIFE-SPAN ENVIRONMENTAL VARIABLES Résumé : Over 15 field seasons (1987–2001), we collected census and life-history data on a population of individually identified ring-tailed lemurs at the Beza Mahafaly Reserve, Madagascar. No significant difference was found in population size over the study period, though a marked decline in the population occurred following a 2-year drought. The population rebounded rapidly after the immediate postdrought period. There was nearly a complete replacement of individuals over the study period. Average group size is 11.5 animals, and adult male to female sex ratio is 0.92. Most females reproduce annually, and the average fecundity rate is 84.3%. The greatest variability in fecundity is found among old females. We suggest that ring-tailed lemur females follow an “income breeding” strategy, i.e., females use maximum resources during reproduction rather than relying on fat stores, as do “capital breeders.” Infant mortality to 1 year of age in a nondrought year is 52%, higher than infant mortality in small to medium-sized anthropoids. The oldest known female was 18 years old in 2001. We suggest that 18–20 years may represent the maximum life-span for wild ring-tailed lemurs. Because males regularly emigrate from the population, we have no data regarding male life-span; however, there is some indication that males do not survive as long as females. Group fission has occurred three times: twice from one parent group living in the driest area of the reserve, with the most dispersed food resources. We suggest that the reproductive strategy that has evolved in this species, wherein females reproduce early in life and annually until old age, is a response to the unusual climate and environmental conditions under which Lemur catta has evolved. Titre du périodique : American Journal of Physical Anthropology Volume : 120: 182-194 En ligne : DOI 10.1002/ajpa.10151 Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective [texte imprimé] / Lisa Gould, Auteur ; R.W. Sussman, Auteur ; Michelle L. Sauther, Auteur . - 2003.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : POPULATION CHANGE FECUNTIDY INFANT MORTALITY LIFE-SPAN ENVIRONMENTAL VARIABLES Résumé : Over 15 field seasons (1987–2001), we collected census and life-history data on a population of individually identified ring-tailed lemurs at the Beza Mahafaly Reserve, Madagascar. No significant difference was found in population size over the study period, though a marked decline in the population occurred following a 2-year drought. The population rebounded rapidly after the immediate postdrought period. There was nearly a complete replacement of individuals over the study period. Average group size is 11.5 animals, and adult male to female sex ratio is 0.92. Most females reproduce annually, and the average fecundity rate is 84.3%. The greatest variability in fecundity is found among old females. We suggest that ring-tailed lemur females follow an “income breeding” strategy, i.e., females use maximum resources during reproduction rather than relying on fat stores, as do “capital breeders.” Infant mortality to 1 year of age in a nondrought year is 52%, higher than infant mortality in small to medium-sized anthropoids. The oldest known female was 18 years old in 2001. We suggest that 18–20 years may represent the maximum life-span for wild ring-tailed lemurs. Because males regularly emigrate from the population, we have no data regarding male life-span; however, there is some indication that males do not survive as long as females. Group fission has occurred three times: twice from one parent group living in the driest area of the reserve, with the most dispersed food resources. We suggest that the reproductive strategy that has evolved in this species, wherein females reproduce early in life and annually until old age, is a response to the unusual climate and environmental conditions under which Lemur catta has evolved. Titre du périodique : American Journal of Physical Anthropology Volume : 120: 182-194 En ligne : DOI 10.1002/ajpa.10151 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Demography, life history, and social structure in Propithecus diadema edwardsi from 1986–2000 in Ranomafana National Park, Madagascar / Sharon T. Pochron
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Titre : Demography, life history, and social structure in Propithecus diadema edwardsi from 1986–2000 in Ranomafana National Park, Madagascar Type de document : texte imprimé Auteurs : Sharon T. Pochron, Auteur ; W. Troy Tucker, Auteur ; Patricia C. Wright, Auteur Année de publication : 2004 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS LIFE TABLE MORTALITY FERTILITY POPULATION GROWTH GROUP STRUCTURE Résumé : Prosimian lemurs differ fundamentally from anthropoid primates in many traits related to social structure. By exploring the demography of Milne-Edwards' sifakas (Propithecus diadema edwardsi), and comparing it to other well-studied primates, we explore the effect of demographic and life-history factors on social structure. Specifically, we compare lemur survivorship and fertility patterns to two published composite models: one created for New World and another created for Old World monkeys. Using longitudinal data collected on individual Propithecus diadema edwardsi from four study groups from 1986–2000 in Ranomafana National Park, Madagascar, we quantify 1) group composition, 2) birth seasonality, 3) interbirth interval, 4) life-table values, and 5) population growth estimates. The mortality, survivorship, and life-expectancy schedules indicate high infant and juvenile mortality. Fertility remains high until death. The intrinsic rate of increase and net reproductive rate indicate a shrinking population. We suggest that high mortality rather than low fertility causes the observed population decline. While sifaka survivorship closely resembles New World patterns, fertility resembles Old World patterns, i.e., like New World monkeys, few sifakas survive to reproductive age, and those that do, reproduce at a slow rate resembling the Old World pattern. This necessarily impacts social structure. An adult sifaka at the end of her lifespan will have one only daughter who survives to reproductive age, compared to 3.4 for New World or 2.7 for Old World monkeys. Demography limits the formation of large kin-based groups for sifakas, and survivorship and fertility patterns do not easily permit sifakas to form large same-sex family groups Titre du périodique : American Journal of Physical Anthropology Volume : 125: 61-72 En ligne : DOI: 10.1002/ajpa.10266 Demography, life history, and social structure in Propithecus diadema edwardsi from 1986–2000 in Ranomafana National Park, Madagascar [texte imprimé] / Sharon T. Pochron, Auteur ; W. Troy Tucker, Auteur ; Patricia C. Wright, Auteur . - 2004.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS LIFE TABLE MORTALITY FERTILITY POPULATION GROWTH GROUP STRUCTURE Résumé : Prosimian lemurs differ fundamentally from anthropoid primates in many traits related to social structure. By exploring the demography of Milne-Edwards' sifakas (Propithecus diadema edwardsi), and comparing it to other well-studied primates, we explore the effect of demographic and life-history factors on social structure. Specifically, we compare lemur survivorship and fertility patterns to two published composite models: one created for New World and another created for Old World monkeys. Using longitudinal data collected on individual Propithecus diadema edwardsi from four study groups from 1986–2000 in Ranomafana National Park, Madagascar, we quantify 1) group composition, 2) birth seasonality, 3) interbirth interval, 4) life-table values, and 5) population growth estimates. The mortality, survivorship, and life-expectancy schedules indicate high infant and juvenile mortality. Fertility remains high until death. The intrinsic rate of increase and net reproductive rate indicate a shrinking population. We suggest that high mortality rather than low fertility causes the observed population decline. While sifaka survivorship closely resembles New World patterns, fertility resembles Old World patterns, i.e., like New World monkeys, few sifakas survive to reproductive age, and those that do, reproduce at a slow rate resembling the Old World pattern. This necessarily impacts social structure. An adult sifaka at the end of her lifespan will have one only daughter who survives to reproductive age, compared to 3.4 for New World or 2.7 for Old World monkeys. Demography limits the formation of large kin-based groups for sifakas, and survivorship and fertility patterns do not easily permit sifakas to form large same-sex family groups Titre du périodique : American Journal of Physical Anthropology Volume : 125: 61-72 En ligne : DOI: 10.1002/ajpa.10266 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Determinants of terrestrial feeding in an arboreal primate: The case of the southern bamboo lemur (Hapalemur meridionalis) / Timothy M. Eppley
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Titre : Determinants of terrestrial feeding in an arboreal primate: The case of the southern bamboo lemur (Hapalemur meridionalis) Type de document : texte imprimé Auteurs : Timothy M. Eppley, Auteur ; Giuseppe Donati, Auteur ; Jörg U. Ganzhorn, Auteur Année de publication : 2016 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ANTIPREDATOR ECOLOGICAL FLEXIBILITY, MADAGASCAR NUTRITIONAL ECOLOGY, TERRESTRIALITY Résumé : The proximate and ultimate determinants that may have prompted some primates to shift from an arboreal to terrestrial feeding niche, whether due to environmental change, seasonality, and/or predation pressure, are poorly understood. Within a fragmented littoral forest in southeast Madagascar, an arboreal strepsirrhine population spends a large proportion of time on the ground, thus we aimed to identify which factors influence terrestrial feeding. From January to December 2013, we conducted 103 full-day focal follows on three social groups of southern bamboo lemurs H. meridionalis. We continuously recorded feeding time on all arboreal and terrestrial items, as well as whether the focal individual was under the canopy or exposed, and the distance to their nearest conspecific neighbor. All observed food items were collected and analyzed for macronutrient content. Daily climatic variables (temperature, precipitation), resource seasonality, daily path length (DPL), along with dietary and predation risk proxies, were used as fixed effects in a linear mixed model, with the daily proportion of terrestrial feeding as the dependent variable. Our model indicated that daily terrestrial feeding increased at cooler temperature, was associated with reduced DPL, and the intake of dietary metabolizable energy increased as terrestrial feeding increased. All other fixed effects were not significant predictors. Our study provides a window into the ultimate determinants of niche expansion: ancestral primates, in absence of their primary resources, may have initially descended to the ground in peripheral population range areas where the benefits (e g., nutritional pay-off) out-weighed the costs.
Titre du périodique : American Journal of Physical Anthropology Volume : 161 (2): 328-342 En ligne : https://doi.org/10.1002/ajpa.23034 Determinants of terrestrial feeding in an arboreal primate: The case of the southern bamboo lemur (Hapalemur meridionalis) [texte imprimé] / Timothy M. Eppley, Auteur ; Giuseppe Donati, Auteur ; Jörg U. Ganzhorn, Auteur . - 2016.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ANTIPREDATOR ECOLOGICAL FLEXIBILITY, MADAGASCAR NUTRITIONAL ECOLOGY, TERRESTRIALITY Résumé : The proximate and ultimate determinants that may have prompted some primates to shift from an arboreal to terrestrial feeding niche, whether due to environmental change, seasonality, and/or predation pressure, are poorly understood. Within a fragmented littoral forest in southeast Madagascar, an arboreal strepsirrhine population spends a large proportion of time on the ground, thus we aimed to identify which factors influence terrestrial feeding. From January to December 2013, we conducted 103 full-day focal follows on three social groups of southern bamboo lemurs H. meridionalis. We continuously recorded feeding time on all arboreal and terrestrial items, as well as whether the focal individual was under the canopy or exposed, and the distance to their nearest conspecific neighbor. All observed food items were collected and analyzed for macronutrient content. Daily climatic variables (temperature, precipitation), resource seasonality, daily path length (DPL), along with dietary and predation risk proxies, were used as fixed effects in a linear mixed model, with the daily proportion of terrestrial feeding as the dependent variable. Our model indicated that daily terrestrial feeding increased at cooler temperature, was associated with reduced DPL, and the intake of dietary metabolizable energy increased as terrestrial feeding increased. All other fixed effects were not significant predictors. Our study provides a window into the ultimate determinants of niche expansion: ancestral primates, in absence of their primary resources, may have initially descended to the ground in peripheral population range areas where the benefits (e g., nutritional pay-off) out-weighed the costs.
Titre du périodique : American Journal of Physical Anthropology Volume : 161 (2): 328-342 En ligne : https://doi.org/10.1002/ajpa.23034 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Diet and feeding behaviour of the black and white ruffed lemur (Varecia variegata variegata) in the Betampona Reserve, eastern Madagascar / Britt, A.
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Titre : Diet and feeding behaviour of the black and white ruffed lemur (Varecia variegata variegata) in the Betampona Reserve, eastern Madagascar Type de document : texte imprimé Auteurs : Britt, A., Auteur Année de publication : 2000 Langues : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEEDING BEHAVIOUR DIET VARECIA BLACK AND WHITE RUFFED LEMUR FEEDING POSTURES SUPPORT USE VERTICAL SPACE Résumé : The feeding behaviour and diet of the black-and-white ruffed lemur (Varecia variegata variegata) was investigated in the Betampona Reserve, eastern Madagascar. The highly frugivorous diet of this subspecies was confirmed – feeding on fruits accounting for 92.0% of feeding records. Most feeding at Betampona was observed at 10–25 m above the forest floor amongst flexible, small (0.5–5.0 cm diameter) and oblique/horizontal (0–45°) supports. The Varecia spent on average 21.7% (± 1.5) of their daily activity budget feeding and employ a variety of postures that enable them to harvest fruits in the rain forest canopy. The suspensory postures were the most important in allowing Varecia to compete with other smaller-bodied frugivores. Titre du périodique : Folia Primatologica Volume : 71(3):133-141 En ligne : https://doi.org/10.1159/000021741 Diet and feeding behaviour of the black and white ruffed lemur (Varecia variegata variegata) in the Betampona Reserve, eastern Madagascar [texte imprimé] / Britt, A., Auteur . - 2000.
Langues : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEEDING BEHAVIOUR DIET VARECIA BLACK AND WHITE RUFFED LEMUR FEEDING POSTURES SUPPORT USE VERTICAL SPACE Résumé : The feeding behaviour and diet of the black-and-white ruffed lemur (Varecia variegata variegata) was investigated in the Betampona Reserve, eastern Madagascar. The highly frugivorous diet of this subspecies was confirmed – feeding on fruits accounting for 92.0% of feeding records. Most feeding at Betampona was observed at 10–25 m above the forest floor amongst flexible, small (0.5–5.0 cm diameter) and oblique/horizontal (0–45°) supports. The Varecia spent on average 21.7% (± 1.5) of their daily activity budget feeding and employ a variety of postures that enable them to harvest fruits in the rain forest canopy. The suspensory postures were the most important in allowing Varecia to compete with other smaller-bodied frugivores. Titre du périodique : Folia Primatologica Volume : 71(3):133-141 En ligne : https://doi.org/10.1159/000021741 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Diet and Feeding Behaviour of the Black-and-White Ruffed Lemur (Varecia variegata variegata) in the Betampona Reserve, Eastern Madagascar / Adam Britt
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Titre : Diet and Feeding Behaviour of the Black-and-White Ruffed Lemur (Varecia variegata variegata) in the Betampona Reserve, Eastern Madagascar Type de document : texte imprimé Auteurs : Adam Britt, Auteur Année de publication : 2000 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEEDING BEHAVIOUR DIET VARECIA BLACK AND WHITE RUFFED LEMUR FEEDING POSTURES SUPPORT USE VERTICAL SPACE Résumé : The feeding behaviour and diet of the black-and-white ruffed lemur (Varecia variegata variegata) was investigated in the Betampona Reserve, eastern Madagascar. The highly frugivorous diet of this subspecies was confirmed – feeding on fruits accounting for 92.0% of feeding records. Most feeding at Betampona was observed at 10–25 m above the forest floor amongst flexible, small (0.5–5.0 cm diameter) and oblique/horizontal (0–45°) supports. The Varecia spent on average 21.7% (± 1.5) of their daily activity budget feeding and employ a variety of postures that enable them to harvest fruits in the rain forest canopy. The suspensory postures were the most important in allowing Varecia to compete with other smaller-bodied frugivores. Titre du périodique : Folia Primatologica Volume : 71(3):133-141 En ligne : https://doi.org/10.1159/000021741 Diet and Feeding Behaviour of the Black-and-White Ruffed Lemur (Varecia variegata variegata) in the Betampona Reserve, Eastern Madagascar [texte imprimé] / Adam Britt, Auteur . - 2000.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEEDING BEHAVIOUR DIET VARECIA BLACK AND WHITE RUFFED LEMUR FEEDING POSTURES SUPPORT USE VERTICAL SPACE Résumé : The feeding behaviour and diet of the black-and-white ruffed lemur (Varecia variegata variegata) was investigated in the Betampona Reserve, eastern Madagascar. The highly frugivorous diet of this subspecies was confirmed – feeding on fruits accounting for 92.0% of feeding records. Most feeding at Betampona was observed at 10–25 m above the forest floor amongst flexible, small (0.5–5.0 cm diameter) and oblique/horizontal (0–45°) supports. The Varecia spent on average 21.7% (± 1.5) of their daily activity budget feeding and employ a variety of postures that enable them to harvest fruits in the rain forest canopy. The suspensory postures were the most important in allowing Varecia to compete with other smaller-bodied frugivores. Titre du périodique : Folia Primatologica Volume : 71(3):133-141 En ligne : https://doi.org/10.1159/000021741 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Diets of Two Lemur Species in Different Microhabitats in Beza Mahafaly Special Reserve, Madagascar / Nayuta Yamashita
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Titre : Diets of Two Lemur Species in Different Microhabitats in Beza Mahafaly Special Reserve, Madagascar Type de document : texte imprimé Auteurs : Nayuta Yamashita, Auteur Année de publication : 2002 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS DIET MECHANICAL PROPRIETIES FOOD TOUGHNESS MICROHABITATS Résumé : Studies of primate diets usually focus on differences that distinguish species or populations. However, variation in diet can occur at a more local level of groups within a population, especially in a non-homogeneous habitat. I compared dietary variation in food composition and toughness across groups of 2 lemur species in Beza Mahafaly special reserve, Madagascar. Beza Mahafaly contains an 80-ha reserve (Parcel 1) that, while small, hosts a dense population of Lemur catta (ring-tailed lemurs) and Propithecus verreauxi verreauxi (sifakas). Microhabitats in the eastern vs. western sides of the parcel are structurally and floristically distinct. Sifakas in this parcel have small, discrete home ranges and are morphological folivores. For these reasons, I expected that the 6 groups studied would eat a different menu of food plants but with similar toughness values. Ring-tailed lemurs have comparatively large, overlapping home ranges, and I expected that the 5 study groups would eat similar foods. Despite living in different microhabitats across the parcel, sifakas exhibit high dietary uniformity both in dietary plant species composition and the toughness of the foods. Food selection in sifakas operates on two distinct levels. Sifaka groups share many key food species that appear independent of local abundances, but the ranking of the foods within each group appears related to availability. Ring-tailed lemur groups are more heterogeneous in the composition of their diets relative to sifakas, though the time spent feeding on individual foods reveals a marked preference for the fruits of Tamarindus indica by all groups. Food toughness is consistent across the parcel with the exception of the most western group. Ring-tailed lemurs are highly specific feeders, but indiscriminate nibblers. Sifakas are targeted, balanced feeders. There does not appear to be a consistent microhabitat effect operating across species. Differences within sifaka and ring-tailed lemur populations in food composition and toughness, however, correspond to an east-west microhabitat gradient. Measures of dietary flexibility must take into account not only the plant species consumed and the different parts eaten but also their associated food properties and proportion of time spent feeding on them. Titre du périodique : International Journal of Primatology Volume : 23 : 1025–1051 En ligne : https://doi.org/10.1023/A:1019645931827 Diets of Two Lemur Species in Different Microhabitats in Beza Mahafaly Special Reserve, Madagascar [texte imprimé] / Nayuta Yamashita, Auteur . - 2002.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURS DIET MECHANICAL PROPRIETIES FOOD TOUGHNESS MICROHABITATS Résumé : Studies of primate diets usually focus on differences that distinguish species or populations. However, variation in diet can occur at a more local level of groups within a population, especially in a non-homogeneous habitat. I compared dietary variation in food composition and toughness across groups of 2 lemur species in Beza Mahafaly special reserve, Madagascar. Beza Mahafaly contains an 80-ha reserve (Parcel 1) that, while small, hosts a dense population of Lemur catta (ring-tailed lemurs) and Propithecus verreauxi verreauxi (sifakas). Microhabitats in the eastern vs. western sides of the parcel are structurally and floristically distinct. Sifakas in this parcel have small, discrete home ranges and are morphological folivores. For these reasons, I expected that the 6 groups studied would eat a different menu of food plants but with similar toughness values. Ring-tailed lemurs have comparatively large, overlapping home ranges, and I expected that the 5 study groups would eat similar foods. Despite living in different microhabitats across the parcel, sifakas exhibit high dietary uniformity both in dietary plant species composition and the toughness of the foods. Food selection in sifakas operates on two distinct levels. Sifaka groups share many key food species that appear independent of local abundances, but the ranking of the foods within each group appears related to availability. Ring-tailed lemur groups are more heterogeneous in the composition of their diets relative to sifakas, though the time spent feeding on individual foods reveals a marked preference for the fruits of Tamarindus indica by all groups. Food toughness is consistent across the parcel with the exception of the most western group. Ring-tailed lemurs are highly specific feeders, but indiscriminate nibblers. Sifakas are targeted, balanced feeders. There does not appear to be a consistent microhabitat effect operating across species. Differences within sifaka and ring-tailed lemur populations in food composition and toughness, however, correspond to an east-west microhabitat gradient. Measures of dietary flexibility must take into account not only the plant species consumed and the different parts eaten but also their associated food properties and proportion of time spent feeding on them. Titre du périodique : International Journal of Primatology Volume : 23 : 1025–1051 En ligne : https://doi.org/10.1023/A:1019645931827 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Discrimination vocale du complexe “Eulemur fulvus” à Madagascar / Miadana Hanitriniaina RAKOTONIRINA
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Titre : Discrimination vocale du complexe “Eulemur fulvus” à Madagascar Type de document : texte imprimé Auteurs : Miadana Hanitriniaina RAKOTONIRINA, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2011 Importance : 46 p. Présentation : 54 réf.; 11 ill.; 9 tab. Note générale : Diplome d'Etudes Approfondies Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPLEXE « EULEMUR FULVUS » ESPECES VOCALISATION TAXONOMIE CRI D’ALARME MADAGASCAR Résumé : Plusieurs études ont montré que chez plusieurs groupes d’animaux, la vocalisation peut aider à comprendre les relations
taxonomiques entre les espèces. Quelques-unes seulement ont investigué sur sa performance quant à la taxonomie des primates non-humains. La présente étude s’est focalisée sur celle des espèces appartenant au complexe « Eulemur fulvus », un groupe qui a été longtemps un grand sujet de discussion à cause de l’élévation de ses membres au degré d’espèces par Groves en 2001, sans argument significatif. L’objectif de cette étude est de savoir si la vocalisation peut servir à différencier chaque espèce du complexe « Eulemur fulvus » précédemment considérée comme sous-espèces d’E. fulvus. Des cris d’alarme ont été enregistrés dans 22 sites à Madagascar en utilisant des « playbacks », ils ont été analysés à partir de l’analyse des fonctions discriminantes (DFA) et l’analyse des variances multivariées (MANOVA). Les résultats ont montré des différences significatives entre les espèces et au niveau de chaque variable. La classification est d’environ 50%. Eulemur sanfordi est différente de chaque autre espèce étudiée, il en est de même pour E. collaris à l’exception de son voisin E. cinereiceps. Ensuite, E. cinereiceps diffère d’E. rufifrons bien que ces espèces soient hybrides, enfin, E. albifrons, E. fulvus et E. rufus diffèrent moins des autres espèces. Tout ceci indique que la vocalisation seule, ne suffit pas pour discriminer les espèces. Elle doit ainsi être combinée avec différentes
données telles que la génétique ou la morphologie pour résoudre le problème de la taxonomie. Jusqu’alors, la taxonomie des Eulemur reste incertaine.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/rakotonirinaMiadanaH_SN_M2_11.pdf Discrimination vocale du complexe “Eulemur fulvus” à Madagascar [texte imprimé] / Miadana Hanitriniaina RAKOTONIRINA, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2011 . - 46 p. : 54 réf.; 11 ill.; 9 tab.
Diplome d'Etudes Approfondies
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPLEXE « EULEMUR FULVUS » ESPECES VOCALISATION TAXONOMIE CRI D’ALARME MADAGASCAR Résumé : Plusieurs études ont montré que chez plusieurs groupes d’animaux, la vocalisation peut aider à comprendre les relations
taxonomiques entre les espèces. Quelques-unes seulement ont investigué sur sa performance quant à la taxonomie des primates non-humains. La présente étude s’est focalisée sur celle des espèces appartenant au complexe « Eulemur fulvus », un groupe qui a été longtemps un grand sujet de discussion à cause de l’élévation de ses membres au degré d’espèces par Groves en 2001, sans argument significatif. L’objectif de cette étude est de savoir si la vocalisation peut servir à différencier chaque espèce du complexe « Eulemur fulvus » précédemment considérée comme sous-espèces d’E. fulvus. Des cris d’alarme ont été enregistrés dans 22 sites à Madagascar en utilisant des « playbacks », ils ont été analysés à partir de l’analyse des fonctions discriminantes (DFA) et l’analyse des variances multivariées (MANOVA). Les résultats ont montré des différences significatives entre les espèces et au niveau de chaque variable. La classification est d’environ 50%. Eulemur sanfordi est différente de chaque autre espèce étudiée, il en est de même pour E. collaris à l’exception de son voisin E. cinereiceps. Ensuite, E. cinereiceps diffère d’E. rufifrons bien que ces espèces soient hybrides, enfin, E. albifrons, E. fulvus et E. rufus diffèrent moins des autres espèces. Tout ceci indique que la vocalisation seule, ne suffit pas pour discriminer les espèces. Elle doit ainsi être combinée avec différentes
données telles que la génétique ou la morphologie pour résoudre le problème de la taxonomie. Jusqu’alors, la taxonomie des Eulemur reste incertaine.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/rakotonirinaMiadanaH_SN_M2_11.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Distribution of a folovorous lemur in relation to seasonally varying food resources: integrating quantitive and qualitative aspects of food characteristics / Jorg, U. Ganzhorn
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Titre : Distribution of a folovorous lemur in relation to seasonally varying food resources: integrating quantitive and qualitative aspects of food characteristics Type de document : texte imprimé Auteurs : Jorg, U. Ganzhorn, Auteur Année de publication : 2002 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : MADAGASCAR PRIMATES LEPILEMUR RUFICAUDATUS SEASONALITY BOTTOM-UP PROCESS Résumé : The goal of this study was to assess the relative importance of food availability and its quality for the spatial distribution of a folivorous lemur species, Lepilemur ruficaudatus, from the highly seasonal dry deciduous forest of Madagascar. Males and females of this species showed opposite changes of body mass and body condition during the dry and the wet season. Male body mass declined during the dry season that coincides with mating, while female body mass remained constant. During the wet season that coincides with lactation, female body mass declined but male body mass increased. This indicates that changes in body mass are not linked as much to environmental seasonality as to mating and reproduction. The distribution of L. ruficaudatus was most significantly related to the spatial distribution of leaf protein during the wet season. Neither the availability nor the chemical composition of leaves eaten during the dry season affected the spatial distribution of L. ruficaudatus. These findings are consistent with hypotheses that constraints are most severe during the times of lactation and weaning and that distributions of primates reflect their food requirements in order to optimize their reproductive success. They are inconsistent with the idea that the lean dry season is the most stressful time of year for lemurs in energetic or nutritive terms. Titre du périodique : Oecologia Volume : 131:427-435 En ligne : https://doi.org/10.1007/s00442-002-0891-y Distribution of a folovorous lemur in relation to seasonally varying food resources: integrating quantitive and qualitative aspects of food characteristics [texte imprimé] / Jorg, U. Ganzhorn, Auteur . - 2002.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : MADAGASCAR PRIMATES LEPILEMUR RUFICAUDATUS SEASONALITY BOTTOM-UP PROCESS Résumé : The goal of this study was to assess the relative importance of food availability and its quality for the spatial distribution of a folivorous lemur species, Lepilemur ruficaudatus, from the highly seasonal dry deciduous forest of Madagascar. Males and females of this species showed opposite changes of body mass and body condition during the dry and the wet season. Male body mass declined during the dry season that coincides with mating, while female body mass remained constant. During the wet season that coincides with lactation, female body mass declined but male body mass increased. This indicates that changes in body mass are not linked as much to environmental seasonality as to mating and reproduction. The distribution of L. ruficaudatus was most significantly related to the spatial distribution of leaf protein during the wet season. Neither the availability nor the chemical composition of leaves eaten during the dry season affected the spatial distribution of L. ruficaudatus. These findings are consistent with hypotheses that constraints are most severe during the times of lactation and weaning and that distributions of primates reflect their food requirements in order to optimize their reproductive success. They are inconsistent with the idea that the lean dry season is the most stressful time of year for lemurs in energetic or nutritive terms. Titre du périodique : Oecologia Volume : 131:427-435 En ligne : https://doi.org/10.1007/s00442-002-0891-y Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Does female dominance facilitate feeding priority in black-and-white ruffed lemurs (Varecia variegata) in southeastern Madagascar? / Deborah J. Overdorff
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Titre : Does female dominance facilitate feeding priority in black-and-white ruffed lemurs (Varecia variegata) in southeastern Madagascar? Type de document : texte imprimé Auteurs : Deborah J. Overdorff, Auteur ; Elizabeth M. Erhart, Auteur ; Thomas Mutschler, Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEMALE FEEDING PRIORITY FEMALE DOMINANCE, LEADERSHIP VARECIA, MADAGASCAR Résumé : Although many Malagasy lemurs are thought to be female dominant and to have female feeding priority, to date the relationship between these behaviors has been rigorously established only in Lemur catta, and other ways that females might achieve feeding priority have not been examined closely. Erhart and Overdorff [International Journal of Primatology 20:927-940, 1999] suggested that one way female primates achieve feeding priority is to initiate and lead groups to food, thereby gaining access to the food first and positively influencing their food intake compared to other group members. Here we describe female dominance patterns and potential measures of feeding priority in two groups of black-and-white ruffed lemurs (Varecia variegata) that were observed over a 15-month period in southeastern Madagascar. We predicted that the females would 1) be consistently dominant to males, 2) lead groups to food sources more often than males, and 3) have higher feeding rates compared to males when they arrived at food sources first. The results were dissimilar between the study groups. During the study, the oldest adult female in group 1 died. There was no evidence for female dominance in this group, and the remaining (likely natal) female did not lead the group more often, nor did she have a higher food intake than males. Group 1 dispersed shortly after the time frame reported here. In contrast, the resident female in group 2 was dominant to group males (based on agonistic interactions), led the group to food sources more often, and experienced a higher food intake when she arrived first at a food source. How these patterns vary over time and are influenced by the number of females in groups, group stability, food quality, and reproductive condition will be examined in future analyses. Titre du périodique : American Journal of Primatology Volume : 66:7-22 En ligne : https://doi.org/10.1002/ajp.20125 Does female dominance facilitate feeding priority in black-and-white ruffed lemurs (Varecia variegata) in southeastern Madagascar? [texte imprimé] / Deborah J. Overdorff, Auteur ; Elizabeth M. Erhart, Auteur ; Thomas Mutschler, Auteur . - 2005.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FEMALE FEEDING PRIORITY FEMALE DOMINANCE, LEADERSHIP VARECIA, MADAGASCAR Résumé : Although many Malagasy lemurs are thought to be female dominant and to have female feeding priority, to date the relationship between these behaviors has been rigorously established only in Lemur catta, and other ways that females might achieve feeding priority have not been examined closely. Erhart and Overdorff [International Journal of Primatology 20:927-940, 1999] suggested that one way female primates achieve feeding priority is to initiate and lead groups to food, thereby gaining access to the food first and positively influencing their food intake compared to other group members. Here we describe female dominance patterns and potential measures of feeding priority in two groups of black-and-white ruffed lemurs (Varecia variegata) that were observed over a 15-month period in southeastern Madagascar. We predicted that the females would 1) be consistently dominant to males, 2) lead groups to food sources more often than males, and 3) have higher feeding rates compared to males when they arrived at food sources first. The results were dissimilar between the study groups. During the study, the oldest adult female in group 1 died. There was no evidence for female dominance in this group, and the remaining (likely natal) female did not lead the group more often, nor did she have a higher food intake than males. Group 1 dispersed shortly after the time frame reported here. In contrast, the resident female in group 2 was dominant to group males (based on agonistic interactions), led the group to food sources more often, and experienced a higher food intake when she arrived first at a food source. How these patterns vary over time and are influenced by the number of females in groups, group stability, food quality, and reproductive condition will be examined in future analyses. Titre du périodique : American Journal of Primatology Volume : 66:7-22 En ligne : https://doi.org/10.1002/ajp.20125 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Ecologically Enigmatic Lemurs: The Sifakas of the Eastern Forests (Propithecus candidus, P. diadema, P. edwardsi, P. perrieri, and P. tattersalli) / M.L. Irwin
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Titre : Ecologically Enigmatic Lemurs: The Sifakas of the Eastern Forests (Propithecus candidus, P. diadema, P. edwardsi, P. perrieri, and P. tattersalli) Type de document : texte imprimé Auteurs : M.L. Irwin, Auteur Année de publication : 2006 Importance : p. 305-326 ISBN/ISSN/EAN : 978-0-387-34586-4 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HOME RANGE FOREST FRAGMENT, PHYSICAL ANTHROPOLOGY SMALL HOME RANGE HANUMAN LANGUR En ligne : https://doi.org/10.1007/978-0-387-34586-4_14 Ecologically Enigmatic Lemurs: The Sifakas of the Eastern Forests (Propithecus candidus, P. diadema, P. edwardsi, P. perrieri, and P. tattersalli) [texte imprimé] / M.L. Irwin, Auteur . - 2006 . - p. 305-326.
ISBN : 978-0-387-34586-4
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HOME RANGE FOREST FRAGMENT, PHYSICAL ANTHROPOLOGY SMALL HOME RANGE HANUMAN LANGUR En ligne : https://doi.org/10.1007/978-0-387-34586-4_14 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Effects of Seasonal Water Scarcity on the Ranging Behavior of Eulemur fulvus rufus / Friederike Scholz
Titre : Effects of Seasonal Water Scarcity on the Ranging Behavior of Eulemur fulvus rufus Type de document : texte imprimé Auteurs : Friederike Scholz, Auteur ; Peter M. Kappeler, Auteur Année de publication : 2004 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : SEASONALITY RANGING LOCAL MIGRATION, MADAGASCAR : EULEMUR FULVUS Résumé : The climate of western Madagascar is characterized by a long (8–9 mo) dry season during which small rivers run dry, so that most animals are dependent on access to a few permanent water holes. We studied the effects of water scarcity at the end of the dry season on the ranging behavior of 4 groups of redfronted lemurs (Eulemur fulvus rufus) living at different distances from the Kirindy Riverbed in the Kirindy/CFPF forest northeast of Morondava. Using radio-collars, we located 2 resident groups with permanent home ranges near the river, and 2 non-resident groups and followed them for 60 days. We obtained a GPS reading every 30 min and later analyzed them with GIS ArcView to determine the size and location of each group's (core) home range. One group resided in direct proximity to the riverbed with several water holes and made regular short trips (mean 330 m) to drink. A second resident group had no direct access to water and made regular trips to the same water hole at a mean distance of 590 m from their home range. One non-resident group had a center of activity about 1300 m from the nearest water hole, to which they traveled on a non-daily basis. The other non-resident group established a temporary binuclear home range with one center of activity near the riverbed, about 2900 m away from the other center of activity. Thus, redfronted lemurs use different drinking and ranging tactics as a function of the distance of their core areas from the nearest water source. Titre du périodique : International Journal of Primatology Volume : 25 (3): 599-613 Effects of Seasonal Water Scarcity on the Ranging Behavior of Eulemur fulvus rufus [texte imprimé] / Friederike Scholz, Auteur ; Peter M. Kappeler, Auteur . - 2004.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : SEASONALITY RANGING LOCAL MIGRATION, MADAGASCAR : EULEMUR FULVUS Résumé : The climate of western Madagascar is characterized by a long (8–9 mo) dry season during which small rivers run dry, so that most animals are dependent on access to a few permanent water holes. We studied the effects of water scarcity at the end of the dry season on the ranging behavior of 4 groups of redfronted lemurs (Eulemur fulvus rufus) living at different distances from the Kirindy Riverbed in the Kirindy/CFPF forest northeast of Morondava. Using radio-collars, we located 2 resident groups with permanent home ranges near the river, and 2 non-resident groups and followed them for 60 days. We obtained a GPS reading every 30 min and later analyzed them with GIS ArcView to determine the size and location of each group's (core) home range. One group resided in direct proximity to the riverbed with several water holes and made regular short trips (mean 330 m) to drink. A second resident group had no direct access to water and made regular trips to the same water hole at a mean distance of 590 m from their home range. One non-resident group had a center of activity about 1300 m from the nearest water hole, to which they traveled on a non-daily basis. The other non-resident group established a temporary binuclear home range with one center of activity near the riverbed, about 2900 m away from the other center of activity. Thus, redfronted lemurs use different drinking and ranging tactics as a function of the distance of their core areas from the nearest water source. Titre du périodique : International Journal of Primatology Volume : 25 (3): 599-613 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Environmental enrichment to address behavioral differences between wild and captive black-and-white ruffed lemurs (Varecia variegata) / Frances J. Kerridge
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Titre : Environmental enrichment to address behavioral differences between wild and captive black-and-white ruffed lemurs (Varecia variegata) Type de document : texte imprimé Auteurs : Frances J. Kerridge, Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : VARECIA VARIEGATA BEHAVIORAL ENRICHMENT CAPTIVE MANAGEMENT SPECIES-TYPICAL BEHAVIOR Résumé : I compared the behaviors of wild Varecia variegata living in a Malagasy rain forest with those of caged groups living in zoos in the United Kingdom in order to design environmental enrichment to encourage more natural behaviors. Comparisons were made between wild and captive animals in terms of activity budgets (instantaneously sampled at 1-min intervals) and social and solitary behaviors, which were continuously recorded for focal individuals. I followed the same sampling protocol during behavioral enrichment experiments, with additional monitoring of the amount and type of food consumed, and with more detailed observations of feeding behavior. No significant differences were found in resting or moving between wild and captive V. variegata. However, captive V. variegata spent more time on self-grooming and social behaviors, and less time feeding than wild V. variegata. There was also a lack of manual manipulation of food items. Behavioral enrichment experiments were carried out in which whole rather than chopped fruit was provided and presented in a more naturalistic manner. With this method of dietary presentation, manual manipulation of dietary items increased. Time spent feeding also increased significantly. Captive conservation breeding programs should not be wholly concerned with maintaining a diverse gene pool–they should also be concerned with conserving species-typical behaviors, especially if they are to produce behaviorally intact captive animals that can be reintroduced to the wild with minimal training, financial resources, and loss of individuals Titre du périodique : American Journal of Primatology Volume : 66:71-84 En ligne : 10.1002/ajp.20128 Environmental enrichment to address behavioral differences between wild and captive black-and-white ruffed lemurs (Varecia variegata) [texte imprimé] / Frances J. Kerridge, Auteur . - 2005.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : VARECIA VARIEGATA BEHAVIORAL ENRICHMENT CAPTIVE MANAGEMENT SPECIES-TYPICAL BEHAVIOR Résumé : I compared the behaviors of wild Varecia variegata living in a Malagasy rain forest with those of caged groups living in zoos in the United Kingdom in order to design environmental enrichment to encourage more natural behaviors. Comparisons were made between wild and captive animals in terms of activity budgets (instantaneously sampled at 1-min intervals) and social and solitary behaviors, which were continuously recorded for focal individuals. I followed the same sampling protocol during behavioral enrichment experiments, with additional monitoring of the amount and type of food consumed, and with more detailed observations of feeding behavior. No significant differences were found in resting or moving between wild and captive V. variegata. However, captive V. variegata spent more time on self-grooming and social behaviors, and less time feeding than wild V. variegata. There was also a lack of manual manipulation of food items. Behavioral enrichment experiments were carried out in which whole rather than chopped fruit was provided and presented in a more naturalistic manner. With this method of dietary presentation, manual manipulation of dietary items increased. Time spent feeding also increased significantly. Captive conservation breeding programs should not be wholly concerned with maintaining a diverse gene pool–they should also be concerned with conserving species-typical behaviors, especially if they are to produce behaviorally intact captive animals that can be reintroduced to the wild with minimal training, financial resources, and loss of individuals Titre du périodique : American Journal of Primatology Volume : 66:71-84 En ligne : 10.1002/ajp.20128 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Etude comparative du comportement alimentaire des femelles adultes et des juvéniles agées d'un an de Indri indri (Gmelin, 1789) dans la foret humide de Maromizaha, Est de Madagascar / Lovasoa Espérance Razafindravony
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Titre : Etude comparative du comportement alimentaire des femelles adultes et des juvéniles agées d'un an de Indri indri (Gmelin, 1789) dans la foret humide de Maromizaha, Est de Madagascar Type de document : texte imprimé Auteurs : Lovasoa Espérance Razafindravony, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2014 Importance : 39 p; Présentation : 31 réf. ; 14 ill.; 7 tab. Note générale : Diplome d'Etudes Approfondies Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENT ALIMENTAIRE FEMELLE ADULTE INDRI INDRI JUVENILE MADAGASCAR MAROMIZAHA Résumé : Une comparaison du comportement alimentaire des femelles adultes et des juvéniles d’Indris (Indri
indri) âgées d’un an a été fait lors d’une étude réalisée dans la forêt humide de Maromizaha au mois de juillet
jusqu’en décembre 2011. La méthode « continuous focal animal sampling » a été choisie pour relever la durée
de chaque comportement, les noms des espèces, les parties de plantes consommées, la vitesse de
consommation ainsi que la hauteur fréquentée pendant l’alimentation. Pour mener l’étude, quatre groupes
d’Indris ont été suivis pendant la saison sèche et humide. Le résultat a montré que pendant la saison sèche, la
proportion de temps consacré à l’alimentation par les femelles adultes comparés aux juvéniles ne présente
aucune différence significative. Par contre, au cours de la saison humide, le cas contraire a été constaté lorsque
les individus comparés n’appartiennent pas au même groupe. Quant au régime alimentaire, l’étude a identifié
que les Indris consomment au total 33 espèces de plantes. L’indice de recouvrement de Pianka révèle que les
plantes consommées par les femelles adultes et les juvéniles présentent une composition spécifique similaire.
Malgré le fait que cette espèce a un régime alimentaire généralement folivore, il a été observé que le temps
imparti à l’alimentation en fruit atteint 72,19% pendant la saison humide. Par ailleurs, même si les femelles
adultes et les juvéniles n’appartiennent pas au même stade de développement, ils présentent un cas similaire de
budget d’activité alimentaire, de régime alimentaire et de vitesse de consommation. Enfin, la hauteur
fréquentée pendant la prise de nourriture est semblable chez les femelles adultes et les juvéniles.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/razafindravonyLovasoa_SN_M2_14.pdf Etude comparative du comportement alimentaire des femelles adultes et des juvéniles agées d'un an de Indri indri (Gmelin, 1789) dans la foret humide de Maromizaha, Est de Madagascar [texte imprimé] / Lovasoa Espérance Razafindravony, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2014 . - 39 p; : 31 réf. ; 14 ill.; 7 tab.
Diplome d'Etudes Approfondies
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENT ALIMENTAIRE FEMELLE ADULTE INDRI INDRI JUVENILE MADAGASCAR MAROMIZAHA Résumé : Une comparaison du comportement alimentaire des femelles adultes et des juvéniles d’Indris (Indri
indri) âgées d’un an a été fait lors d’une étude réalisée dans la forêt humide de Maromizaha au mois de juillet
jusqu’en décembre 2011. La méthode « continuous focal animal sampling » a été choisie pour relever la durée
de chaque comportement, les noms des espèces, les parties de plantes consommées, la vitesse de
consommation ainsi que la hauteur fréquentée pendant l’alimentation. Pour mener l’étude, quatre groupes
d’Indris ont été suivis pendant la saison sèche et humide. Le résultat a montré que pendant la saison sèche, la
proportion de temps consacré à l’alimentation par les femelles adultes comparés aux juvéniles ne présente
aucune différence significative. Par contre, au cours de la saison humide, le cas contraire a été constaté lorsque
les individus comparés n’appartiennent pas au même groupe. Quant au régime alimentaire, l’étude a identifié
que les Indris consomment au total 33 espèces de plantes. L’indice de recouvrement de Pianka révèle que les
plantes consommées par les femelles adultes et les juvéniles présentent une composition spécifique similaire.
Malgré le fait que cette espèce a un régime alimentaire généralement folivore, il a été observé que le temps
imparti à l’alimentation en fruit atteint 72,19% pendant la saison humide. Par ailleurs, même si les femelles
adultes et les juvéniles n’appartiennent pas au même stade de développement, ils présentent un cas similaire de
budget d’activité alimentaire, de régime alimentaire et de vitesse de consommation. Enfin, la hauteur
fréquentée pendant la prise de nourriture est semblable chez les femelles adultes et les juvéniles.
En ligne : http://biblio.univ-antananarivo.mg/pdfs/razafindravonyLovasoa_SN_M2_14.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Etude du comportement alimentaire et utilisation de l'habitat par Propithecus coronatus: Cas de la foret galerie d'Amboloando (CR Dabolava-District Miandrivazo) / Andriamihaja Rado RAKOTONDRABE
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Titre : Etude du comportement alimentaire et utilisation de l'habitat par Propithecus coronatus: Cas de la foret galerie d'Amboloando (CR Dabolava-District Miandrivazo) Type de document : texte imprimé Auteurs : Andriamihaja Rado RAKOTONDRABE, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2012 Importance : 67 p. Présentation : 62 réf.; 18 ill.; 22 tab. Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROPITHECUS CORONATUS LEMURIENS ACTIVITES NOURRITURE HABITAT MADAGASCAR Résumé : Une étude sur le comportement alimentaire et sur l’utilisation de l’habitat par Propithecus coronatus a
été réalisée dans la forêt d’Amboloando (CR Dabolava) en mars et avril 2010 afin d’analyser le mode
de vie adopté par cette espèce pour survivre dans un habitat très fragmenté. « Instantaneous
sampling » pour un intervalle de 3 minutes et « ad libitum » ont été utilisées durant les observations.
Les résultats indiquent la domination du repos (54.69%) et de l’alimentation (31.58%) sur l’activité
générale de l’espèce. Particulièrement, pour l’alimentation, malgré la saison de l’étude et l’état de
l’habitat, Propithecus coronatus demeure un lémurien folivore. Il consomme des feuilles (62.96%),
des fruits (28.66%) et une quantité minime des autres parties végétales. Mais la consommation de ces
types d’aliments varie avec le sexe et la saison. Propithecus coronatus consomme 35 variétés de
plantes pour satisfaire son besoin alimentaires, et pour 3 mn, l’espèce fait une moyenne de 20.23 ±
0.14 bouchés lors de l’alimentation. Parmi les différents endroits du site, la zone I est la plus exploitée
par l’espèce suite à sa qualité moins dégradée et loin des tapages. A Dabolava, Propithecus coronatus
utilise d’avantage le niveau moyen compris entre 5 à 10 m (40.94%) et le niveau haut 10 à 15 m
(22.46%). Quant à l’utilisation des supports, l’espèce utilise beaucoup plus les branche d’arbres à
dimension ? 5 cm (48.50%) et les branches de diamètre compris entre 5 et 10 cm (32.58%).
L’utilisation mensuelle et par sexe de ces niveaux et diamètres est significativement différent.
Comparé aux comportements de Propithecus diadema de la RNI de Betampona et de Propithecus
coronatus de la forêt d’Antrema, le comportement et le mode de vie de Propithecus coronatus de
Dabolava présente quelques variations qui résultent probablement de la qualité de l’habitat et de la
répartition phytogéographique. Mais des similarités sont aussi observées. En bref, malgré la
dégradation de son habitat, Propithecus coronatus est contraint de s’adapter à son milieu pour
survivre.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rakotondrabeAndriamihajaR_SN_M2_12.pdf Etude du comportement alimentaire et utilisation de l'habitat par Propithecus coronatus: Cas de la foret galerie d'Amboloando (CR Dabolava-District Miandrivazo) [texte imprimé] / Andriamihaja Rado RAKOTONDRABE, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2012 . - 67 p. : 62 réf.; 18 ill.; 22 tab.
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROPITHECUS CORONATUS LEMURIENS ACTIVITES NOURRITURE HABITAT MADAGASCAR Résumé : Une étude sur le comportement alimentaire et sur l’utilisation de l’habitat par Propithecus coronatus a
été réalisée dans la forêt d’Amboloando (CR Dabolava) en mars et avril 2010 afin d’analyser le mode
de vie adopté par cette espèce pour survivre dans un habitat très fragmenté. « Instantaneous
sampling » pour un intervalle de 3 minutes et « ad libitum » ont été utilisées durant les observations.
Les résultats indiquent la domination du repos (54.69%) et de l’alimentation (31.58%) sur l’activité
générale de l’espèce. Particulièrement, pour l’alimentation, malgré la saison de l’étude et l’état de
l’habitat, Propithecus coronatus demeure un lémurien folivore. Il consomme des feuilles (62.96%),
des fruits (28.66%) et une quantité minime des autres parties végétales. Mais la consommation de ces
types d’aliments varie avec le sexe et la saison. Propithecus coronatus consomme 35 variétés de
plantes pour satisfaire son besoin alimentaires, et pour 3 mn, l’espèce fait une moyenne de 20.23 ±
0.14 bouchés lors de l’alimentation. Parmi les différents endroits du site, la zone I est la plus exploitée
par l’espèce suite à sa qualité moins dégradée et loin des tapages. A Dabolava, Propithecus coronatus
utilise d’avantage le niveau moyen compris entre 5 à 10 m (40.94%) et le niveau haut 10 à 15 m
(22.46%). Quant à l’utilisation des supports, l’espèce utilise beaucoup plus les branche d’arbres à
dimension ? 5 cm (48.50%) et les branches de diamètre compris entre 5 et 10 cm (32.58%).
L’utilisation mensuelle et par sexe de ces niveaux et diamètres est significativement différent.
Comparé aux comportements de Propithecus diadema de la RNI de Betampona et de Propithecus
coronatus de la forêt d’Antrema, le comportement et le mode de vie de Propithecus coronatus de
Dabolava présente quelques variations qui résultent probablement de la qualité de l’habitat et de la
répartition phytogéographique. Mais des similarités sont aussi observées. En bref, malgré la
dégradation de son habitat, Propithecus coronatus est contraint de s’adapter à son milieu pour
survivre.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rakotondrabeAndriamihajaR_SN_M2_12.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Etudes des comportements et des territoire de deux espèces de lémuriens nocturnes Avahi laniger (Gmelin 1788) et Lepilemur mustelinus (Geoffroy 1851) dans le parc national de Mantadia / Voahangitiana Noeline Rasoamanarivo
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Titre : Etudes des comportements et des territoire de deux espèces de lémuriens nocturnes Avahi laniger (Gmelin 1788) et Lepilemur mustelinus (Geoffroy 1851) dans le parc national de Mantadia Type de document : texte imprimé Auteurs : Voahangitiana Noeline Rasoamanarivo, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2011 Importance : 51 p. Présentation : 67 réf.; 20 ill.; 9 tab. Note générale : Diplome d'Etudes Approndies Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENTS TERRITOIRES ACTIVITES SUPPORTS, SUBSTRATS, LEMURIENS NOCTURNES AVAHI LANIGER LEPILEMUR MUSTELINUS PARC NATIONAL DE MANTADIA MADAGASCAR Résumé : Ce travail se rapporte aux études des comportements et des territoires de deux espèces de
lémuriens exclusivement nocturnes: Avahi laniger & Lepilemur mustelinus dans le Parc National de
Mantadia, dans la partie Est de Madagascar durant la période chaude (Octobre 2008 au Février
2009). Durant les observations, la méthode utilisé est le « Focal animal sampling ».
Les résultats obtenus indiquent qu’il y a une différence statistiquement significative entre les
activités de A. laniger et de L. mustelinus. La fréquence de l’activité « alimentation » ne représente
que 10% des activités chez A. laniger, il se nourrit avec le minimum de temps, ce qui semble se
traduire par la consommation d’une faible quantité de nourriture. Par contre pour L. mustelinus
l’activité « alimentation» a une proportion de 20%, c’est pourquoi il dépense 37% de temps de
« déplacement » consacré à la recherche de nourriture. Alors que pour ce dernier activité « Repos »
prédomine 68% pour A. laniger et 43% pour L. mustelinus. A. laniger presque au repos par rapport L.
mustelinus. Les fréquences de la dimension et de l’orientation des supports au cour des différentes
activités sont différentes pour les deux espèces. Pendant le déplacement A. Laniger préfère les
branches verticales en tant que sauteur verticale tandis que L. mustelinus à la fois verticale et oblique.
La hauteur entre 4-7m est la plus adoptée par A. Laniger pendant le repos et le déplacement et celle
le niveau entre 8-15m pour L. Mustelinus. La surface du territoire de ces deux espèces sont
différents : 1.33 ha pour A. laniger et 1.23 ha pour L. mustelinusEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rasoamanarivoVoahangitianaN_SN_M2_11.pdf Etudes des comportements et des territoire de deux espèces de lémuriens nocturnes Avahi laniger (Gmelin 1788) et Lepilemur mustelinus (Geoffroy 1851) dans le parc national de Mantadia [texte imprimé] / Voahangitiana Noeline Rasoamanarivo, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2011 . - 51 p. : 67 réf.; 20 ill.; 9 tab.
Diplome d'Etudes Approndies
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : COMPORTEMENTS TERRITOIRES ACTIVITES SUPPORTS, SUBSTRATS, LEMURIENS NOCTURNES AVAHI LANIGER LEPILEMUR MUSTELINUS PARC NATIONAL DE MANTADIA MADAGASCAR Résumé : Ce travail se rapporte aux études des comportements et des territoires de deux espèces de
lémuriens exclusivement nocturnes: Avahi laniger & Lepilemur mustelinus dans le Parc National de
Mantadia, dans la partie Est de Madagascar durant la période chaude (Octobre 2008 au Février
2009). Durant les observations, la méthode utilisé est le « Focal animal sampling ».
Les résultats obtenus indiquent qu’il y a une différence statistiquement significative entre les
activités de A. laniger et de L. mustelinus. La fréquence de l’activité « alimentation » ne représente
que 10% des activités chez A. laniger, il se nourrit avec le minimum de temps, ce qui semble se
traduire par la consommation d’une faible quantité de nourriture. Par contre pour L. mustelinus
l’activité « alimentation» a une proportion de 20%, c’est pourquoi il dépense 37% de temps de
« déplacement » consacré à la recherche de nourriture. Alors que pour ce dernier activité « Repos »
prédomine 68% pour A. laniger et 43% pour L. mustelinus. A. laniger presque au repos par rapport L.
mustelinus. Les fréquences de la dimension et de l’orientation des supports au cour des différentes
activités sont différentes pour les deux espèces. Pendant le déplacement A. Laniger préfère les
branches verticales en tant que sauteur verticale tandis que L. mustelinus à la fois verticale et oblique.
La hauteur entre 4-7m est la plus adoptée par A. Laniger pendant le repos et le déplacement et celle
le niveau entre 8-15m pour L. Mustelinus. La surface du territoire de ces deux espèces sont
différents : 1.33 ha pour A. laniger et 1.23 ha pour L. mustelinusEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rasoamanarivoVoahangitianaN_SN_M2_11.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Feeding Ecology of Propithecus diadema in Forest Fragments and Continuous Forest Type de document : texte imprimé Auteurs : M.T. Irwin, Auteur Année de publication : 2008 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : CONSERVATION DIADEMED SIFAKAS DIET FOREST FRAGMENTATION MISTLETOE PROPITHECYS DIADEMA Résumé : Forest fragmentation is viewed as a serious threat to primates, yet whether or not it can disrupt food resources and cause energetic stress remains largely untested. I present the results of a 12-mo study of the feeding ecology of Propithecus diadema in fragmented and continuous forest at Tsinjoarivo, eastern Madagascar. Two continuous forest groups had higher dietary diversity and ate more fleshy fruit, but during the dry season, diversity was reduced and they relied heavily on mistletoe (Bakerella clavata). In contrast, 2 groups in fragments employed the lean season strategy of eating mistletoe year-round; the fruiting tree species that sustain continuous forest groups through the rainy season were largely absent. As expected, intersite dietary overlap was highest in the dry season. The level of specialization was high: fragment groups devoted 30–40% of feeding time to Bakerella clavata, compared to 28–30% in continuous forest. The major characteristic of Bakerella clavata enabling it to be an important fallback or staple resource, or both, is its extended phenology. The difference in resource utilization between sites may have important implications for nutritional status, as well as ranging and social behavior, largely owing to the small size and high abundance of feeding patches of Bakerella. Understanding resource shifts in fragments can shed light on socioecological questions by providing comparisons between continuous forest and fragment populations with differing diets and resource distributions. In addition, understanding dietary shifts in fragments can aid in species-specific conservation efforts, while contributing to a better understanding of the considerable interspecific variability of primates in responses to fragmentation. Titre du périodique : International Journal of Primatology Volume : 29: 95-115 En ligne : https://doi.org/10.1007/s10764-007-9222-9 Feeding Ecology of Propithecus diadema in Forest Fragments and Continuous Forest [texte imprimé] / M.T. Irwin, Auteur . - 2008.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : CONSERVATION DIADEMED SIFAKAS DIET FOREST FRAGMENTATION MISTLETOE PROPITHECYS DIADEMA Résumé : Forest fragmentation is viewed as a serious threat to primates, yet whether or not it can disrupt food resources and cause energetic stress remains largely untested. I present the results of a 12-mo study of the feeding ecology of Propithecus diadema in fragmented and continuous forest at Tsinjoarivo, eastern Madagascar. Two continuous forest groups had higher dietary diversity and ate more fleshy fruit, but during the dry season, diversity was reduced and they relied heavily on mistletoe (Bakerella clavata). In contrast, 2 groups in fragments employed the lean season strategy of eating mistletoe year-round; the fruiting tree species that sustain continuous forest groups through the rainy season were largely absent. As expected, intersite dietary overlap was highest in the dry season. The level of specialization was high: fragment groups devoted 30–40% of feeding time to Bakerella clavata, compared to 28–30% in continuous forest. The major characteristic of Bakerella clavata enabling it to be an important fallback or staple resource, or both, is its extended phenology. The difference in resource utilization between sites may have important implications for nutritional status, as well as ranging and social behavior, largely owing to the small size and high abundance of feeding patches of Bakerella. Understanding resource shifts in fragments can shed light on socioecological questions by providing comparisons between continuous forest and fragment populations with differing diets and resource distributions. In addition, understanding dietary shifts in fragments can aid in species-specific conservation efforts, while contributing to a better understanding of the considerable interspecific variability of primates in responses to fragmentation. Titre du périodique : International Journal of Primatology Volume : 29: 95-115 En ligne : https://doi.org/10.1007/s10764-007-9222-9 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Feeding ecology of sympatric mouse lemur species in Northwestern Madagascar / Radespiel; U., Reimann, W., Rahelinirina, M., Zimmermann, E.
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Titre : Feeding ecology of sympatric mouse lemur species in Northwestern Madagascar Type de document : texte imprimé Auteurs : Radespiel; U., Reimann, W., Rahelinirina, M., Zimmermann, E., Auteur Année de publication : 2010 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : DIET FEEDING ECOLOGY MICROCEBUS STREPSIRHINES Résumé : We performed a comparative pilot study on vertical space use and feeding ecology of 2 closely related sympatric mouse lemur species in northwestern Madagascar. We recorded feeding behavior and the use of vertical forest strata for 6 gray and 4 golden-brown mouse lemur females that we followed for 120 h. We carried out feeding experiments and analyzed fecal samples for food remains. Both species showed no significant difference in use of forest strata. They had a similar overall diet, with insect secretions and gum as main plant food resources; arthropod remains occurred in about half of all fecal samples. Both lemurs used in common >50% of the plant species that each consumed, which accounts for ?70% of all individual plants used. However, both species used >40% of their feeding plant species exclusively and seemed to differ in their degree of specialization on certain plant species. Titre du périodique : International Journal of Primatology Volume : 27 (311) En ligne : https://doi.org/10.1007/s10764-005-9005-0 Feeding ecology of sympatric mouse lemur species in Northwestern Madagascar [texte imprimé] / Radespiel; U., Reimann, W., Rahelinirina, M., Zimmermann, E., Auteur . - 2010.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : DIET FEEDING ECOLOGY MICROCEBUS STREPSIRHINES Résumé : We performed a comparative pilot study on vertical space use and feeding ecology of 2 closely related sympatric mouse lemur species in northwestern Madagascar. We recorded feeding behavior and the use of vertical forest strata for 6 gray and 4 golden-brown mouse lemur females that we followed for 120 h. We carried out feeding experiments and analyzed fecal samples for food remains. Both species showed no significant difference in use of forest strata. They had a similar overall diet, with insect secretions and gum as main plant food resources; arthropod remains occurred in about half of all fecal samples. Both lemurs used in common >50% of the plant species that each consumed, which accounts for ?70% of all individual plants used. However, both species used >40% of their feeding plant species exclusively and seemed to differ in their degree of specialization on certain plant species. Titre du périodique : International Journal of Primatology Volume : 27 (311) En ligne : https://doi.org/10.1007/s10764-005-9005-0 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Group Composition, Home Range Size, and Diet of Three Sympatric Bamboo Lemur Species (Genus Hapalemur) in Ranomafana National Park, Madagascar / Chia, L. Tan
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Titre : Group Composition, Home Range Size, and Diet of Three Sympatric Bamboo Lemur Species (Genus Hapalemur) in Ranomafana National Park, Madagascar Type de document : texte imprimé Auteurs : Chia, L. Tan, Auteur Année de publication : 1999 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HAPALEMUR BAMBOO, CYANIDE BODY SIZE NICHE PARTITIONING Résumé : This is the first long-term, simultaneous, comparative study of three bamboo lemur species (Hapalemur griseus, H. aureus, and H. simus) at a site in southeastern-central Madagascar where they occur in sympatry. At Talatakely, Ranomafana National Park, the three Hapalemur spp. share overlapping home ranges. Hapalemur griseus has flexible group sizes, varying from three to nine individuals (n = 6). The home range of Hapalemur griseus averages 15 ha (n = 2). Hapalemur aureus forms family groups of ?4 individuals (n = 3); they have a home range on average of 26 ha (n = 2). The single group of Hapalemur simus is composed of one or three adult males, two adult females, and their offspring; they occupy a home range of 62 ha. The three species of Hapalemur are year-round bamboo specialists: >88% of their diets consist of bamboo and grass in the Family Poaceae. Contrary to earlier findings, all three Hapalemur spp. consume the cynogenic parts—young leaf bases, young pseudopetioles, and young shoots—of the giant bamboo, Cathariostachys madagascariensis. They rely heavily on this plant, which comprises 72–95% of their diets. Hapalemur griseus and H. aureus consume similar proportions of bamboo vs. nonbamboo plants, though they differ in the species of bamboo they prefer. Hapalemur simus has the most distinct diet of the three bamboo lemurs. They exploit the young shoots of Cathariostachys madagascariensis during the austral summer rainy season, between November and April. From June to November, Hapalemur simus shifts its diet to eating the mature culm pith of Cathariostachys madagascariensis; the proportion of pith represented in their diet reaches a maximum of 89% in October. Seasonal availability of food resources, feeding competition, and factors related to body size may provide clues to the understanding of diet selection among the three sympatric Hapalemur spp. Titre du périodique : International Journal of Primatology Volume : 20 (4): 547-566 En ligne : https://doi.org/10.1023/A:1020390723639 Group Composition, Home Range Size, and Diet of Three Sympatric Bamboo Lemur Species (Genus Hapalemur) in Ranomafana National Park, Madagascar [texte imprimé] / Chia, L. Tan, Auteur . - 1999.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : HAPALEMUR BAMBOO, CYANIDE BODY SIZE NICHE PARTITIONING Résumé : This is the first long-term, simultaneous, comparative study of three bamboo lemur species (Hapalemur griseus, H. aureus, and H. simus) at a site in southeastern-central Madagascar where they occur in sympatry. At Talatakely, Ranomafana National Park, the three Hapalemur spp. share overlapping home ranges. Hapalemur griseus has flexible group sizes, varying from three to nine individuals (n = 6). The home range of Hapalemur griseus averages 15 ha (n = 2). Hapalemur aureus forms family groups of ?4 individuals (n = 3); they have a home range on average of 26 ha (n = 2). The single group of Hapalemur simus is composed of one or three adult males, two adult females, and their offspring; they occupy a home range of 62 ha. The three species of Hapalemur are year-round bamboo specialists: >88% of their diets consist of bamboo and grass in the Family Poaceae. Contrary to earlier findings, all three Hapalemur spp. consume the cynogenic parts—young leaf bases, young pseudopetioles, and young shoots—of the giant bamboo, Cathariostachys madagascariensis. They rely heavily on this plant, which comprises 72–95% of their diets. Hapalemur griseus and H. aureus consume similar proportions of bamboo vs. nonbamboo plants, though they differ in the species of bamboo they prefer. Hapalemur simus has the most distinct diet of the three bamboo lemurs. They exploit the young shoots of Cathariostachys madagascariensis during the austral summer rainy season, between November and April. From June to November, Hapalemur simus shifts its diet to eating the mature culm pith of Cathariostachys madagascariensis; the proportion of pith represented in their diet reaches a maximum of 89% in October. Seasonal availability of food resources, feeding competition, and factors related to body size may provide clues to the understanding of diet selection among the three sympatric Hapalemur spp. Titre du périodique : International Journal of Primatology Volume : 20 (4): 547-566 En ligne : https://doi.org/10.1023/A:1020390723639 Exemplaires
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Titre : Group histories and offspring sex ratios in ringtailed lemurs (Lemur catta) Type de document : texte imprimé Auteurs : C. L. Nunn, Auteur ; Michael E. Pereira, Auteur Année de publication : 2000 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : OFFSPRING SEX RATIONS FACULTATIVE ADJUSTMENT LOCAL RESOURCE ENHANCEMENT RINGTAILED LEMURS LEMUR CATTA Résumé : Birth sex ratios were examined for ringtailed lemurs (Lemur catta) at the Duke University Primate Center. This population provides a long-term database of births under a variety of demographic and management conditions, including two semi-freeranging groups between which males transfer freely and females defend stable territorial boundaries. We examined three hypotheses usually considered in studies of primate sex ratio bias. The Trivers-Willard hypothesis predicts that dominant females produce males, local resource competition at the population level (LRC-population) predicts that the dispersing sex (males) will be overproduced in dense populations, and local resource competition among individuals (LRC-individual) predicts that dominant females overproduce the philopatric sex (females). We also examined a fourth hypothesis, local resource enhancement (LRE), which is usually subsumed under LRC-individual in studies of primate sex ratio evolution. LRE predicts that under certain conditions, females will produce the sex that provides later cooperative benefits, such as alliance support for within- or between-group competition. Our data provide support for LRE: females overproduce daughters given prospects of new group formation, either through group fission or threatened expulsion of young mothers. Behavioral data from Duke and also wild populations show that daughters serve mothers as important allies in this context and LRE effects also have been documented in other mammals that experience similar group histories. Nonsignificant trends in the data supported the LRC-population hypothesis, and we suggest that LRC interacts with LRE to explain offspring sex ratios in ringtailed lemurs. Titre du périodique : Behavioral Ecology and Sociobiology volume Volume : 48: 18–28 En ligne : https://doi.org/10.1007/s002650000206 Group histories and offspring sex ratios in ringtailed lemurs (Lemur catta) [texte imprimé] / C. L. Nunn, Auteur ; Michael E. Pereira, Auteur . - 2000.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : OFFSPRING SEX RATIONS FACULTATIVE ADJUSTMENT LOCAL RESOURCE ENHANCEMENT RINGTAILED LEMURS LEMUR CATTA Résumé : Birth sex ratios were examined for ringtailed lemurs (Lemur catta) at the Duke University Primate Center. This population provides a long-term database of births under a variety of demographic and management conditions, including two semi-freeranging groups between which males transfer freely and females defend stable territorial boundaries. We examined three hypotheses usually considered in studies of primate sex ratio bias. The Trivers-Willard hypothesis predicts that dominant females produce males, local resource competition at the population level (LRC-population) predicts that the dispersing sex (males) will be overproduced in dense populations, and local resource competition among individuals (LRC-individual) predicts that dominant females overproduce the philopatric sex (females). We also examined a fourth hypothesis, local resource enhancement (LRE), which is usually subsumed under LRC-individual in studies of primate sex ratio evolution. LRE predicts that under certain conditions, females will produce the sex that provides later cooperative benefits, such as alliance support for within- or between-group competition. Our data provide support for LRE: females overproduce daughters given prospects of new group formation, either through group fission or threatened expulsion of young mothers. Behavioral data from Duke and also wild populations show that daughters serve mothers as important allies in this context and LRE effects also have been documented in other mammals that experience similar group histories. Nonsignificant trends in the data supported the LRC-population hypothesis, and we suggest that LRC interacts with LRE to explain offspring sex ratios in ringtailed lemurs. Titre du périodique : Behavioral Ecology and Sociobiology volume Volume : 48: 18–28 En ligne : https://doi.org/10.1007/s002650000206 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons / Volampeno, M.S.N., Masters, J.C., Downs, C.T.
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Titre : Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons Type de document : texte imprimé Auteurs : Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur Année de publication : 2011 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : ANKARAFA FOREST CONSERVATION STRATEGY EULEMUR FLAVIFRONS POPULATION VIABILITY ANALYSIS VORTEX Résumé : Population viability analysis is an important tool to assess the extinction risk in small populations of highly specialized primates. The blue-eyed black lemur (Eulemur flavifrons) is critically endangered with a restricted range in the north-western dry deciduous forest of Madagascar, where habitat fragmentation and loss of forest connectivity threaten its survival. We performed a population viability analysis (PVA) of this lemur in Ankarafa Forest in the Sahamalaza Peninsula National Park, north-western Madagascar, to determine the demographic parameters most influential for population persistence and to assess extinction probabilities. We conducted PVA analyses using different demographic parameters which characterize the species including reproduction, lifespan and population size using the software VORTEX for six scenarios with 100 iterations and simulated over 100 years. The simulations suggested the first extinction within 13 years when the percentage of habitat destruction increased up to 12%. Severe habitat destruction such as fire and logging was the major cause which led to the risk of population extinction. Conservation strategies, in particular measures to reduce habitat destruction, are proposed to ensure the survival of this critically endangered lemur. Titre du périodique : African Journal of Ecology Volume : 53 :419-427 En ligne : DOI: 10.1111/aje.12213. Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons [texte imprimé] / Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur . - 2011.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : ANKARAFA FOREST CONSERVATION STRATEGY EULEMUR FLAVIFRONS POPULATION VIABILITY ANALYSIS VORTEX Résumé : Population viability analysis is an important tool to assess the extinction risk in small populations of highly specialized primates. The blue-eyed black lemur (Eulemur flavifrons) is critically endangered with a restricted range in the north-western dry deciduous forest of Madagascar, where habitat fragmentation and loss of forest connectivity threaten its survival. We performed a population viability analysis (PVA) of this lemur in Ankarafa Forest in the Sahamalaza Peninsula National Park, north-western Madagascar, to determine the demographic parameters most influential for population persistence and to assess extinction probabilities. We conducted PVA analyses using different demographic parameters which characterize the species including reproduction, lifespan and population size using the software VORTEX for six scenarios with 100 iterations and simulated over 100 years. The simulations suggested the first extinction within 13 years when the percentage of habitat destruction increased up to 12%. Severe habitat destruction such as fire and logging was the major cause which led to the risk of population extinction. Conservation strategies, in particular measures to reduce habitat destruction, are proposed to ensure the survival of this critically endangered lemur. Titre du périodique : African Journal of Ecology Volume : 53 :419-427 En ligne : DOI: 10.1111/aje.12213. Exemplaires
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Titre : Infant development and parental care in two species of sifakas Type de document : texte imprimé Auteurs : Bettina Grieser, Auteur Année de publication : 1992 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : INFANT DEVELOPMENT PARENTAL CARE PROPITHECUS REPRODUCTIVE COSTS ECOLOGY Résumé : This paper reports the results of a three-month field study on parental care and infant development in the diademed sifaka (Propithecus diadema edwardsi) in the primary rain-forest of south-eastern Madagascar. They are compared with a three-and-a-half-month study of captive white sifaka (Propithecus verreauxi coquereli) in the Duke University Primate Centre. Records were taken by means of focal animal and instantaneous sampling. In both species the mother was the primary carrier and caretaker; theP. verreauxi father carried the infant significantly more than did any animal other than the mother in theP. diadema group. The infantP. verreauxi spent less time off the mother than didP. diadema from week 4 through week 10. It is concluded thatP. verreauxi shows more non-maternal care thanP. diadema and also develops at a slower rate. The difference in the two species' habitats is discussed as a possible cause. Titre du périodique : Primates Volume : 33 (3): 305-314 En ligne : https://doi.org/10.1007/BF02381192 Infant development and parental care in two species of sifakas [texte imprimé] / Bettina Grieser, Auteur . - 1992.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : INFANT DEVELOPMENT PARENTAL CARE PROPITHECUS REPRODUCTIVE COSTS ECOLOGY Résumé : This paper reports the results of a three-month field study on parental care and infant development in the diademed sifaka (Propithecus diadema edwardsi) in the primary rain-forest of south-eastern Madagascar. They are compared with a three-and-a-half-month study of captive white sifaka (Propithecus verreauxi coquereli) in the Duke University Primate Centre. Records were taken by means of focal animal and instantaneous sampling. In both species the mother was the primary carrier and caretaker; theP. verreauxi father carried the infant significantly more than did any animal other than the mother in theP. diadema group. The infantP. verreauxi spent less time off the mother than didP. diadema from week 4 through week 10. It is concluded thatP. verreauxi shows more non-maternal care thanP. diadema and also develops at a slower rate. The difference in the two species' habitats is discussed as a possible cause. Titre du périodique : Primates Volume : 33 (3): 305-314 En ligne : https://doi.org/10.1007/BF02381192 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Influence of dry season and food quality and quantity on behavior and feeding strategy of Propithecus verreauxi in Kirindy, Madagascar / Ivan Norscia
Titre : Influence of dry season and food quality and quantity on behavior and feeding strategy of Propithecus verreauxi in Kirindy, Madagascar Type de document : texte imprimé Auteurs : Ivan Norscia, Auteur ; Valentina Carrai, Auteur ; Silvana M Borgognini-Tarli, Auteur Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY PATTERNS DIET DRY SEASON FEEDING STRATEGY PROPITHECYS VERREAUXI VERREAUXI RANGING BEHAVIOR SIFAKA Résumé : According to optimal foraging theory, herbivores can base food choice mainly on the quality or the quantity of food, or both. Among herbivorous primates, folivorous lemurs living in the highly seasonal environment of Madagascar have to cope with the shortage of high-quality food during the dry season, at least in deciduous forests. We studied (Verreaux's sifaka) in Kirindy, western Madagascar, to understand the influence of dry season and food quality and quantity on behavioral patterns and feeding strategy (qualitative vs. quantitative dietary choice) of a folivorous lemur in a deciduous forest. We followed 7 groups (4 groups/period; 3 individuals/group/month) during 4 periods of the year (wet season: February–March; early/middle/late dry season: May–June; July–September; October–November). We collected samples of plants eaten and examined behavioral and feeding patterns, considering food quality (macronutrients, proteins/fibers ratio, and tannins) and abundance. We found 1) a significant reduction of home range, core area, and daily path length from the wet to the dry season, possibly related to dietary change and 2) a daily period of inactivity in the dry season for energy conservation. Regarding the feeding strategy, Kirindy sifakas showed 1) high variation and selection in choosing food items and 2) a dietary choice based mainly on quality: Kirindy sifakas fed on plant species/families independently from their abundance and tannins represented a feeding deterrent during the dry season. Overall, behavioral and dietary adaptations allow Kirindy sifakas to overcome the shortage of high-quality food in the lean period. Titre du périodique : International Journal of Primatology Volume : 27(4): 1001-1022 Influence of dry season and food quality and quantity on behavior and feeding strategy of Propithecus verreauxi in Kirindy, Madagascar [texte imprimé] / Ivan Norscia, Auteur ; Valentina Carrai, Auteur ; Silvana M Borgognini-Tarli, Auteur . - 2006.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY PATTERNS DIET DRY SEASON FEEDING STRATEGY PROPITHECYS VERREAUXI VERREAUXI RANGING BEHAVIOR SIFAKA Résumé : According to optimal foraging theory, herbivores can base food choice mainly on the quality or the quantity of food, or both. Among herbivorous primates, folivorous lemurs living in the highly seasonal environment of Madagascar have to cope with the shortage of high-quality food during the dry season, at least in deciduous forests. We studied (Verreaux's sifaka) in Kirindy, western Madagascar, to understand the influence of dry season and food quality and quantity on behavioral patterns and feeding strategy (qualitative vs. quantitative dietary choice) of a folivorous lemur in a deciduous forest. We followed 7 groups (4 groups/period; 3 individuals/group/month) during 4 periods of the year (wet season: February–March; early/middle/late dry season: May–June; July–September; October–November). We collected samples of plants eaten and examined behavioral and feeding patterns, considering food quality (macronutrients, proteins/fibers ratio, and tannins) and abundance. We found 1) a significant reduction of home range, core area, and daily path length from the wet to the dry season, possibly related to dietary change and 2) a daily period of inactivity in the dry season for energy conservation. Regarding the feeding strategy, Kirindy sifakas showed 1) high variation and selection in choosing food items and 2) a dietary choice based mainly on quality: Kirindy sifakas fed on plant species/families independently from their abundance and tannins represented a feeding deterrent during the dry season. Overall, behavioral and dietary adaptations allow Kirindy sifakas to overcome the shortage of high-quality food in the lean period. Titre du périodique : International Journal of Primatology Volume : 27(4): 1001-1022 Exemplaires
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Titre : Lemur traits and Madagascar ecology: Coping with an island environment Type de document : texte imprimé Auteurs : Patricia C. Wright, Auteur Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LIFE HISTORY WEANING SYNCHRONY FEMALE DOMINANCE CATHEMERALITY ENERGY CONSERVATION DISEQUILIBRIUM HYPOTHESIS Résumé : The last decade's lemur research includes successes in discovering new living and extinct species and learning about the distribution, biogeography, physiology, behavior, and ecology of previously little-studied species. In addition, in both the dry forest and rain forest, long-term studies of lemur demography, life history, and reproduction, have been completed in conjunction with data on tree productivity, phenology, and climate. Lemurs contrast with anthropoids in several behavioral features, including female dominance, targeted female-female aggression, lack of sexual dimorphism regardless of mating system, sperm competition coupled with male-male aggression, high infant mortality, cathemerality, and strict seasonal breeding. Hypotheses to explain these traits include the “energy conservation hypothesis” (ECH) suggesting that harsh and unpredictable climate factors on the island of Madagascar have affected the evolution of female dominance, and the “evolutionary disequilibrium hypotheses” (EVDH) suggesting that the recent megafauna extinctions have influenced lemurs to become diurnal. These hypotheses are compared and contrasted in light of recent empirical data on climate, subfossils, and lemur behavior. New data on life histories of the rain forest lemurs at Ranomafana National Park give further support to the ECH. Birth seasons are synchronized within each species, but there is a 6-month distribution of births among species. Gestation and lactation lengths vary among sympatric lemurs, but all lemur species in the rain forest wean in synchrony at the season most likely to have abundant resources. Across-species weaning synchrony seen in Ranomafana corroborates data from the dry forest that late lactation and weaning is the life history event that is the primary focus of the annual schedule. Lemur adaptations may assure maximum offspring survival in this environment with an unpredictable food supply and heavy predation. In conclusion, a more comprehensive energy frugality hypothesis (EFH) is proposed, which postulates that the majority of lemur traits are either adaptations to conserve energy (e.g., low basal metabolic rate (BMR), torpor, sperm competition, small group size, seasonal breeding) or to maximize use of scarce resources (e.g., cathemerality, territoriality, female dominance, fibrous diet, weaning synchrony). Among primates, the isolated adaptive radiation of lemurs on Madagascar may have been uniquely characterized by selection toward efficiency to cope with the harsh and unpredictable island environmen Titre du périodique : Yearbook of Physical Anthropology Volume : 42: 31-72 En ligne : ttps://doi.org/10.1002/(SICI)1096-8644(1999)110:29+<31::AID-AJPA3>3.0.CO;2-0 Lemur traits and Madagascar ecology: Coping with an island environment [texte imprimé] / Patricia C. Wright, Auteur . - [s.d.].
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LIFE HISTORY WEANING SYNCHRONY FEMALE DOMINANCE CATHEMERALITY ENERGY CONSERVATION DISEQUILIBRIUM HYPOTHESIS Résumé : The last decade's lemur research includes successes in discovering new living and extinct species and learning about the distribution, biogeography, physiology, behavior, and ecology of previously little-studied species. In addition, in both the dry forest and rain forest, long-term studies of lemur demography, life history, and reproduction, have been completed in conjunction with data on tree productivity, phenology, and climate. Lemurs contrast with anthropoids in several behavioral features, including female dominance, targeted female-female aggression, lack of sexual dimorphism regardless of mating system, sperm competition coupled with male-male aggression, high infant mortality, cathemerality, and strict seasonal breeding. Hypotheses to explain these traits include the “energy conservation hypothesis” (ECH) suggesting that harsh and unpredictable climate factors on the island of Madagascar have affected the evolution of female dominance, and the “evolutionary disequilibrium hypotheses” (EVDH) suggesting that the recent megafauna extinctions have influenced lemurs to become diurnal. These hypotheses are compared and contrasted in light of recent empirical data on climate, subfossils, and lemur behavior. New data on life histories of the rain forest lemurs at Ranomafana National Park give further support to the ECH. Birth seasons are synchronized within each species, but there is a 6-month distribution of births among species. Gestation and lactation lengths vary among sympatric lemurs, but all lemur species in the rain forest wean in synchrony at the season most likely to have abundant resources. Across-species weaning synchrony seen in Ranomafana corroborates data from the dry forest that late lactation and weaning is the life history event that is the primary focus of the annual schedule. Lemur adaptations may assure maximum offspring survival in this environment with an unpredictable food supply and heavy predation. In conclusion, a more comprehensive energy frugality hypothesis (EFH) is proposed, which postulates that the majority of lemur traits are either adaptations to conserve energy (e.g., low basal metabolic rate (BMR), torpor, sperm competition, small group size, seasonal breeding) or to maximize use of scarce resources (e.g., cathemerality, territoriality, female dominance, fibrous diet, weaning synchrony). Among primates, the isolated adaptive radiation of lemurs on Madagascar may have been uniquely characterized by selection toward efficiency to cope with the harsh and unpredictable island environmen Titre du périodique : Yearbook of Physical Anthropology Volume : 42: 31-72 En ligne : ttps://doi.org/10.1002/(SICI)1096-8644(1999)110:29+<31::AID-AJPA3>3.0.CO;2-0 Exemplaires
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Titre : Les lémuriens des forêts sèches malgaches Type de document : texte imprimé Auteurs : Jose M. Ralison, Auteur Année de publication : 2008 Langues : Français (fre) Langues originales : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FORET SECHE OCCIDENTAL LEMURIENS DIVERSITE SPECIFIQUE Résumé : Pendant les saisons humides de 2004 à 2007, des inventaires rapides sur les lémuriens ont été menés dans 19 endroits différents de la forêt sèche du versant occidental de Madagascar. La méthode de transect a été utilisée pour l’estimation de la densité et la méthode de capture-relâche a été adoptée pour l’identificationdesespècesdelémuriensdepetitetaille. Une évaluation de l’état de la forêt et des menaces
de la population de lémuriens de chaque site a été entreprise. Au total, 25 espèces de lémuriens ont été
inventoriées dont 6 diurnes (Propithecus coquereli, P. deckenii, P. verreauxi, Eulemur fulvus, Lemur catta
et Hapalemur occidentalis), 3 espèces cathémérales (Eulemur rufus, E. mongoz et E. macaco flavifrons)
et 16 nocturnes (Avahi occidentalis, Lepilemur sp., L. sahamalazensis, L. ruficaudatus, L. edwardsi, L.
petteri, Phaner pallescens, Cheirogaleus medius, Mirza zaza, M. coquereli, Microcebus ravelobensis,
M. myoxinus, M. murinus, M. griseorufus, M. berthae et Daubentonia madagascariensis).
La diversité spécifique est élevée dans les sites ayant un statut de protection légale tels que les Parcs
Nationaux d’Ankarafantsika et de Kirindy Mite ainsi que la station forestière de Kirindy (CFPF). Pour
l’ensemble des sites, les densités de lémuriens sont affectées par les variations longitudinale (rs = 0,211,
P = 0,01) et latitudinale (rs = -0,171, P= 0,04). La perte de l’habitat naturel provenant des pressions
anthropiques constitue des problèmes majeurs pour la viabilité de certaines espèces de lémuriens dans
des vestiges forestiers. Etant donné l’absence d’une protection légale des sites à haut risque de disparaître,
la considération de leur intégration dans le système des aires protégées devrait être primordiale.Titre du périodique : Malagasy Nature Volume : 1:135-156 En ligne : http://www.vahatra.mg/volume1/mn01_06.pdf Les lémuriens des forêts sèches malgaches [texte imprimé] / Jose M. Ralison, Auteur . - 2008.
Langues : Français (fre) Langues originales : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : FORET SECHE OCCIDENTAL LEMURIENS DIVERSITE SPECIFIQUE Résumé : Pendant les saisons humides de 2004 à 2007, des inventaires rapides sur les lémuriens ont été menés dans 19 endroits différents de la forêt sèche du versant occidental de Madagascar. La méthode de transect a été utilisée pour l’estimation de la densité et la méthode de capture-relâche a été adoptée pour l’identificationdesespècesdelémuriensdepetitetaille. Une évaluation de l’état de la forêt et des menaces
de la population de lémuriens de chaque site a été entreprise. Au total, 25 espèces de lémuriens ont été
inventoriées dont 6 diurnes (Propithecus coquereli, P. deckenii, P. verreauxi, Eulemur fulvus, Lemur catta
et Hapalemur occidentalis), 3 espèces cathémérales (Eulemur rufus, E. mongoz et E. macaco flavifrons)
et 16 nocturnes (Avahi occidentalis, Lepilemur sp., L. sahamalazensis, L. ruficaudatus, L. edwardsi, L.
petteri, Phaner pallescens, Cheirogaleus medius, Mirza zaza, M. coquereli, Microcebus ravelobensis,
M. myoxinus, M. murinus, M. griseorufus, M. berthae et Daubentonia madagascariensis).
La diversité spécifique est élevée dans les sites ayant un statut de protection légale tels que les Parcs
Nationaux d’Ankarafantsika et de Kirindy Mite ainsi que la station forestière de Kirindy (CFPF). Pour
l’ensemble des sites, les densités de lémuriens sont affectées par les variations longitudinale (rs = 0,211,
P = 0,01) et latitudinale (rs = -0,171, P= 0,04). La perte de l’habitat naturel provenant des pressions
anthropiques constitue des problèmes majeurs pour la viabilité de certaines espèces de lémuriens dans
des vestiges forestiers. Etant donné l’absence d’une protection légale des sites à haut risque de disparaître,
la considération de leur intégration dans le système des aires protégées devrait être primordiale.Titre du périodique : Malagasy Nature Volume : 1:135-156 En ligne : http://www.vahatra.mg/volume1/mn01_06.pdf Exemplaires
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Titre : Lemurs : Ecology and Adaptation Type de document : texte imprimé Auteurs : Lisa Gould, Auteur ; M.L. Sauther, Auteur Mention d'édition : 1ère Edition Editeur : New York, NY [USA] : Springer Année de publication : 2006 Collection : Developments in Primatology: Progress and Prospects, ISSN 1574-3497 Importance : 450 p. ISBN/ISSN/EAN : 978-0-387-34586-4 Prix : $ 116,95 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ADAPTATION EVOLUTION BEHAVIOR BEHAVIORAL ECOLOGY ECOLOGY ENVIRONMENT PRIMATE BEHAVIOR PRIMATES Résumé : In this comprehensive volume, written by experts in the field, information gathered on lemur ecology and adaptation over the past 15 years is presented by both seasoned and newer lemur researchers, and provides us with further knowledge concerning both well-studied and rarely studied extant species, as well as insights into the ecology and adaptation of some of the recently extinct lemurs. With the dramatic increase in behavioral and ecological studies on a great variety of lemur species in the past few decades, our knowledge concerning the adaptation of these charming primates to Madagascar's unpredictable and sometimes harsh environmental conditions has improved significantly. Lemurs: Ecology and Adaptation will be a useful and fascinating source book for researchers and students of primate ecology. En ligne : https://doi.org/10.1007/978-0-387-34586-4 Lemurs : Ecology and Adaptation [texte imprimé] / Lisa Gould, Auteur ; M.L. Sauther, Auteur . - 1ère Edition . - New York, NY [USA] : Springer, 2006 . - 450 p.. - (Developments in Primatology: Progress and Prospects, ISSN 1574-3497) .
ISBN : 978-0-387-34586-4 : $ 116,95
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ADAPTATION EVOLUTION BEHAVIOR BEHAVIORAL ECOLOGY ECOLOGY ENVIRONMENT PRIMATE BEHAVIOR PRIMATES Résumé : In this comprehensive volume, written by experts in the field, information gathered on lemur ecology and adaptation over the past 15 years is presented by both seasoned and newer lemur researchers, and provides us with further knowledge concerning both well-studied and rarely studied extant species, as well as insights into the ecology and adaptation of some of the recently extinct lemurs. With the dramatic increase in behavioral and ecological studies on a great variety of lemur species in the past few decades, our knowledge concerning the adaptation of these charming primates to Madagascar's unpredictable and sometimes harsh environmental conditions has improved significantly. Lemurs: Ecology and Adaptation will be a useful and fascinating source book for researchers and students of primate ecology. En ligne : https://doi.org/10.1007/978-0-387-34586-4 ContenuExemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Male and Female Activity Patterns in Microcebus murinus During the Dry Season at Kirindy Forest, Western Madagascar / Emilienne Rasoazanabary
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Titre : Male and Female Activity Patterns in Microcebus murinus During the Dry Season at Kirindy Forest, Western Madagascar Type de document : texte imprimé Auteurs : Emilienne Rasoazanabary, Auteur Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY LEVELS DRY SEASON KIRINDY FOREST MICROCEBUS MURINUS NESTS SEASONAL TORPOR SEX DIFFERENCES Résumé : I investigated sexual differences in activity levels, and their adaptive significance in gray mouse lemurs, Microcebus murinus, during the dry season. I studied them between April and September, 1999, at Kirindy Forest, a dry deciduous forest in western Madagascar. Six males and 6 females were radiocollared and followed using focal individual sampling. The males remained active throughout the dry season, whereas the females hibernated for up to 3 mo. Males exhibited a gradual decrease in activity from May to June and some of them remained inactive for periods of a few days to 1 wk. Males were more active in July. Though there were changes in the duration of time spent sleeping, there was no significant change in male body mass throughout the period. Males appear to prefer to rest in nests that are close to or coincident with those preferred by females, and multiple males may simultaneously share nests with multiple hibernating females. Males occupying nests that are close to or coincident with nests preferred by females tend to switch nests less frequently than others do. Researchers have suggested that high levels of activity prepare males for the mating season, which occurs at the end of the dry season. Presumably, by maintaining an active lifestyle throughout the dry season, certain males may position themselves to monopolize the best tree holes during the mating season. The reproductive advantages gained by this behavior may overshadow the costs of remaining active during the dry season when resources are scarce, temperatures are low, and predator pressure is high. Measurements on captured males confirm a weak (nonsignificant) positive correlation between body mass and activity levels. There is no indication that the heavier, more active males were better able to monopolize the best tree holes. Titre du périodique : International Journal of Primatology Volume : 27 (2) : 437-464 En ligne : DOI:10.1007/s10764-006-9017-4 Male and Female Activity Patterns in Microcebus murinus During the Dry Season at Kirindy Forest, Western Madagascar [texte imprimé] / Emilienne Rasoazanabary, Auteur . - 2006.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ACTIVITY LEVELS DRY SEASON KIRINDY FOREST MICROCEBUS MURINUS NESTS SEASONAL TORPOR SEX DIFFERENCES Résumé : I investigated sexual differences in activity levels, and their adaptive significance in gray mouse lemurs, Microcebus murinus, during the dry season. I studied them between April and September, 1999, at Kirindy Forest, a dry deciduous forest in western Madagascar. Six males and 6 females were radiocollared and followed using focal individual sampling. The males remained active throughout the dry season, whereas the females hibernated for up to 3 mo. Males exhibited a gradual decrease in activity from May to June and some of them remained inactive for periods of a few days to 1 wk. Males were more active in July. Though there were changes in the duration of time spent sleeping, there was no significant change in male body mass throughout the period. Males appear to prefer to rest in nests that are close to or coincident with those preferred by females, and multiple males may simultaneously share nests with multiple hibernating females. Males occupying nests that are close to or coincident with nests preferred by females tend to switch nests less frequently than others do. Researchers have suggested that high levels of activity prepare males for the mating season, which occurs at the end of the dry season. Presumably, by maintaining an active lifestyle throughout the dry season, certain males may position themselves to monopolize the best tree holes during the mating season. The reproductive advantages gained by this behavior may overshadow the costs of remaining active during the dry season when resources are scarce, temperatures are low, and predator pressure is high. Measurements on captured males confirm a weak (nonsignificant) positive correlation between body mass and activity levels. There is no indication that the heavier, more active males were better able to monopolize the best tree holes. Titre du périodique : International Journal of Primatology Volume : 27 (2) : 437-464 En ligne : DOI:10.1007/s10764-006-9017-4 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Mode de partage des champs d'alimentation chez Propithecus diadema (Bennett, 1832) reintroduit dans la Reserve Speciale d'Analamazoatra, Madagascar / Nandrianina RABETOANDRO
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Titre : Mode de partage des champs d'alimentation chez Propithecus diadema (Bennett, 1832) reintroduit dans la Reserve Speciale d'Analamazoatra, Madagascar Type de document : texte imprimé Auteurs : Nandrianina RABETOANDRO, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2017 Importance : 46 p. Présentation : 33 réf.; 11 ill.; 5 tab. Note générale : Master II Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : RESERVE SPECIALE D'ANAMAMAZOATRA CHAMP D'ALIMENTATION PARTAGE COURONNE, PROPITHECUS DIADEMA Résumé : La Réserve Spéciale d’Analamazaotra, située sur la partie Est de Madagascar, abrite plusieurs biodiversités
animales et végétales. Propithecus diadema est l’une des espèces de lémuriens qu’on trouve dans la Réserve.
Comme la plupart des lémuriens, P. diadema passe la plupart de son temps à s’alimenter. En évaluant la
fréquence de partage des champs d’alimentation et en utilisant la méthode d’échantillonnage continue entre
février 2015 et février 2016, il a été montré qu’il existe vraiment un partage des champs d’alimentation entre les
individus dans un groupe. Les résultats obtenus ont révélé une différence de la fréquence de partage entre le mâle
et la femelle envers les autres membres du groupe. Cette fréquence varie de 47,40% à 55,50% pour la femelle.
Pour le mâle, la fréquence est de l’ordre de 28,30% à 38,50%. C’est la femelle qui partage plus le champ
d’alimentation avec les autres membres du groupe. La fréquence de partage entre les parents et les petits présente
aussi une différence significative. Pour la femelle, le taux de partage avec les juvéniles est de 15,30% à 47,20%.
Envers les sub-adultes, ce taux est de 3,20% à 17,20%. Pour celui du mâle, le taux de partage des champs
d’alimentation avec les juvéniles est un peu plus faible de l’ordre de 7,20% à 20,80%. Au niveau des sub-adultes,
le taux de partage du mâle est plus élevé que celui de la femelle. Il varie de 10,30% à 30,10%. De plus, la taille
des couronnes des arbres a des effets sur le partage des champs d’alimentation. Plus la couronne est large, plus le
partage augmenteEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rabetoandroNandrianina_SN_MAST2_17.pdf Mode de partage des champs d'alimentation chez Propithecus diadema (Bennett, 1832) reintroduit dans la Reserve Speciale d'Analamazoatra, Madagascar [texte imprimé] / Nandrianina RABETOANDRO, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2017 . - 46 p. : 33 réf.; 11 ill.; 5 tab.
Master II
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : RESERVE SPECIALE D'ANAMAMAZOATRA CHAMP D'ALIMENTATION PARTAGE COURONNE, PROPITHECUS DIADEMA Résumé : La Réserve Spéciale d’Analamazaotra, située sur la partie Est de Madagascar, abrite plusieurs biodiversités
animales et végétales. Propithecus diadema est l’une des espèces de lémuriens qu’on trouve dans la Réserve.
Comme la plupart des lémuriens, P. diadema passe la plupart de son temps à s’alimenter. En évaluant la
fréquence de partage des champs d’alimentation et en utilisant la méthode d’échantillonnage continue entre
février 2015 et février 2016, il a été montré qu’il existe vraiment un partage des champs d’alimentation entre les
individus dans un groupe. Les résultats obtenus ont révélé une différence de la fréquence de partage entre le mâle
et la femelle envers les autres membres du groupe. Cette fréquence varie de 47,40% à 55,50% pour la femelle.
Pour le mâle, la fréquence est de l’ordre de 28,30% à 38,50%. C’est la femelle qui partage plus le champ
d’alimentation avec les autres membres du groupe. La fréquence de partage entre les parents et les petits présente
aussi une différence significative. Pour la femelle, le taux de partage avec les juvéniles est de 15,30% à 47,20%.
Envers les sub-adultes, ce taux est de 3,20% à 17,20%. Pour celui du mâle, le taux de partage des champs
d’alimentation avec les juvéniles est un peu plus faible de l’ordre de 7,20% à 20,80%. Au niveau des sub-adultes,
le taux de partage du mâle est plus élevé que celui de la femelle. Il varie de 10,30% à 30,10%. De plus, la taille
des couronnes des arbres a des effets sur le partage des champs d’alimentation. Plus la couronne est large, plus le
partage augmenteEn ligne : http://biblio.univ-antananarivo.mg/pdfs/rabetoandroNandrianina_SN_MAST2_17.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? / Dan Hending
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Titre : Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? Type de document : texte imprimé Auteurs : Dan Hending, Auteur Année de publication : 2021 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : DEMOGRAPHY ECOLOGICAL NICHE MODELING FOREST HABITAT GEOPGRAPHIC DISTRIBUTION PROTECTED AREAS, STREPSIRRHINES Résumé : Ecological niche modeling can provide insights into a species’ demography, ecology and biogeography, and the environmental factors that determine them. Exploration of ecological niche models and niche-divergence among closely-related and cryptic organisms can also be useful for species delineation and discrimination, and such information can inform and facilitate conservation of their populations. In this study, I used an ecological niche modeling approach to investigate the conservation biogeography of the fork-marked lemurs (genus Phaner), a group of cryptic, nocturnal primates that are endemic to Madagascar. I constructed all ecological niche models in MaxEnt, using a range of climatic and habitat-related variables. I examined interspecific niche-separation within the Phaner genus, and among two sub-populations of P. electromontis, a species which has previously been hypothesized to represent two distinct, cryptic taxa. All ecological niche models performed well and with high accuracy, and whilst the percentage contribution of each environmental variable differed between species, the results suggested that climate may be the primary determinant of Phaner distribution. Further, all four Phaner species occupied distinct ecological niches, a result that was also mirrored in the two P. electromontis sub-populations. This suggests that one of the two sub-populations may indeed be a distinct, as-yet undescribed species, but further genetic and ecological research is needed to substantiate this result. Finally, the ecological niche models revealed that only 23.0% of the suitable land area for Phaner occurrence within Madagascar is forested, limiting the geographic distribution of these lemurs. Whilst much of this suitable habitat is thankfully protected, deforestation continues throughout Madagascar, and this under-studied group of lemurs requires further research attention and continued conservation efforts. Titre du périodique : Global Ecology and Conservation Volume : 29 En ligne : https://doi.org/10.1016/j.gecco.2021.e01738 Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? [texte imprimé] / Dan Hending, Auteur . - 2021.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : DEMOGRAPHY ECOLOGICAL NICHE MODELING FOREST HABITAT GEOPGRAPHIC DISTRIBUTION PROTECTED AREAS, STREPSIRRHINES Résumé : Ecological niche modeling can provide insights into a species’ demography, ecology and biogeography, and the environmental factors that determine them. Exploration of ecological niche models and niche-divergence among closely-related and cryptic organisms can also be useful for species delineation and discrimination, and such information can inform and facilitate conservation of their populations. In this study, I used an ecological niche modeling approach to investigate the conservation biogeography of the fork-marked lemurs (genus Phaner), a group of cryptic, nocturnal primates that are endemic to Madagascar. I constructed all ecological niche models in MaxEnt, using a range of climatic and habitat-related variables. I examined interspecific niche-separation within the Phaner genus, and among two sub-populations of P. electromontis, a species which has previously been hypothesized to represent two distinct, cryptic taxa. All ecological niche models performed well and with high accuracy, and whilst the percentage contribution of each environmental variable differed between species, the results suggested that climate may be the primary determinant of Phaner distribution. Further, all four Phaner species occupied distinct ecological niches, a result that was also mirrored in the two P. electromontis sub-populations. This suggests that one of the two sub-populations may indeed be a distinct, as-yet undescribed species, but further genetic and ecological research is needed to substantiate this result. Finally, the ecological niche models revealed that only 23.0% of the suitable land area for Phaner occurrence within Madagascar is forested, limiting the geographic distribution of these lemurs. Whilst much of this suitable habitat is thankfully protected, deforestation continues throughout Madagascar, and this under-studied group of lemurs requires further research attention and continued conservation efforts. Titre du périodique : Global Ecology and Conservation Volume : 29 En ligne : https://doi.org/10.1016/j.gecco.2021.e01738 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? / Dan Hending
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Titre : Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? Type de document : texte imprimé Auteurs : Dan Hending, Auteur Année de publication : 2021 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : DEMOGRAPHY ECOLOGICAL NICHE MODELING FOREST HABITAT GEOPGRAPHIC DISTRIBUTION PROTECTED AREAS, STREPSIRRHINES Résumé : Ecological niche modeling can provide insights into a species’ demography, ecology and biogeography, and the environmental factors that determine them. Exploration of ecological niche models and niche-divergence among closely-related and cryptic organisms can also be useful for species delineation and discrimination, and such information can inform and facilitate conservation of their populations. In this study, I used an ecological niche modeling approach to investigate the conservation biogeography of the fork-marked lemurs (genus Phaner), a group of cryptic, nocturnal primates that are endemic to Madagascar. I constructed all ecological niche models in MaxEnt, using a range of climatic and habitat-related variables. I examined interspecific niche-separation within the Phaner genus, and among two sub-populations of P. electromontis, a species which has previously been hypothesized to represent two distinct, cryptic taxa. All ecological niche models performed well and with high accuracy, and whilst the percentage contribution of each environmental variable differed between species, the results suggested that climate may be the primary determinant of Phaner distribution. Further, all four Phaner species occupied distinct ecological niches, a result that was also mirrored in the two P. electromontis sub-populations. This suggests that one of the two sub-populations may indeed be a distinct, as-yet undescribed species, but further genetic and ecological research is needed to substantiate this result. Finally, the ecological niche models revealed that only 23.0% of the suitable land area for Phaner occurrence within Madagascar is forested, limiting the geographic distribution of these lemurs. Whilst much of this suitable habitat is thankfully protected, deforestation continues throughout Madagascar, and this under-studied group of lemurs requires further research attention and continued conservation efforts. Titre du périodique : Global Ecology and Conservation Volume : 29 En ligne : https://doi.org/10.1016/j.gecco.2021.e01738 Niche-separation and conservation biogeography of Madagascar’s fork-marked lemurs (Cheirogaleidae: Phaner): Evidence of a new cryptic species? [texte imprimé] / Dan Hending, Auteur . - 2021.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : DEMOGRAPHY ECOLOGICAL NICHE MODELING FOREST HABITAT GEOPGRAPHIC DISTRIBUTION PROTECTED AREAS, STREPSIRRHINES Résumé : Ecological niche modeling can provide insights into a species’ demography, ecology and biogeography, and the environmental factors that determine them. Exploration of ecological niche models and niche-divergence among closely-related and cryptic organisms can also be useful for species delineation and discrimination, and such information can inform and facilitate conservation of their populations. In this study, I used an ecological niche modeling approach to investigate the conservation biogeography of the fork-marked lemurs (genus Phaner), a group of cryptic, nocturnal primates that are endemic to Madagascar. I constructed all ecological niche models in MaxEnt, using a range of climatic and habitat-related variables. I examined interspecific niche-separation within the Phaner genus, and among two sub-populations of P. electromontis, a species which has previously been hypothesized to represent two distinct, cryptic taxa. All ecological niche models performed well and with high accuracy, and whilst the percentage contribution of each environmental variable differed between species, the results suggested that climate may be the primary determinant of Phaner distribution. Further, all four Phaner species occupied distinct ecological niches, a result that was also mirrored in the two P. electromontis sub-populations. This suggests that one of the two sub-populations may indeed be a distinct, as-yet undescribed species, but further genetic and ecological research is needed to substantiate this result. Finally, the ecological niche models revealed that only 23.0% of the suitable land area for Phaner occurrence within Madagascar is forested, limiting the geographic distribution of these lemurs. Whilst much of this suitable habitat is thankfully protected, deforestation continues throughout Madagascar, and this under-studied group of lemurs requires further research attention and continued conservation efforts. Titre du périodique : Global Ecology and Conservation Volume : 29 En ligne : https://doi.org/10.1016/j.gecco.2021.e01738 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Population demography and social structure changes in Eulemur fulvus rufus from 1988 to 2003 / Elizabeth M. Erhart
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Titre : Population demography and social structure changes in Eulemur fulvus rufus from 1988 to 2003 Type de document : texte imprimé Auteurs : Elizabeth M. Erhart, Auteur ; Deborah J. Overdorff, Auteur Année de publication : 2008 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROSIMIAN MIGRATION BIRTH RATE SEX RATIO GROUP FISSION Résumé : Eulemur fulvus rufus has been described as having stable multi-male/multi-female groups, a male-biased sex ratio, and female philopatry. However, in a 16-year study of this subspecies we documented a great deal of demographic change as several groups permanently fissioned, some groups disappeared, and new groups formed. We split the dataset into two periods, 1988 to 1993 and 1994 to 2003, which coincided with the first disappearance of a study group (in August 1994) and the first permanent group fission (in December 1994). The average group size decreased by nearly half between the study periods (10.5–5.6), while the frequency of group membership changes increased (2.0–8.3 times/year), and the birth rate decreased (0.56–0.38). Females, as well as males, immigrated into study groups and transferred between groups, something that has been rarely seen in this subspecies. We also found a significant decline in the amount of fruit from the earliest part of the study to the latter part of the study. Study groups did not switch to other types of foods during periods of fruit shortage, but traveled outside of their home range areas more often over the study period. Finally, the density E. f. rufus decreased in the study area while the densities of their main food competitors, Varecia variegata and Eulemur rubriventer, increased. Although few primate populations are numerically stable over time, we suggest that female behavioral responses to decreases in fruit availability may have influenced some of the demographic changes we witnessed in this study Titre du périodique : American Journal of Physical Anthropology Volume : 136 : 183-193 En ligne : https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20793 Population demography and social structure changes in Eulemur fulvus rufus from 1988 to 2003 [texte imprimé] / Elizabeth M. Erhart, Auteur ; Deborah J. Overdorff, Auteur . - 2008.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROSIMIAN MIGRATION BIRTH RATE SEX RATIO GROUP FISSION Résumé : Eulemur fulvus rufus has been described as having stable multi-male/multi-female groups, a male-biased sex ratio, and female philopatry. However, in a 16-year study of this subspecies we documented a great deal of demographic change as several groups permanently fissioned, some groups disappeared, and new groups formed. We split the dataset into two periods, 1988 to 1993 and 1994 to 2003, which coincided with the first disappearance of a study group (in August 1994) and the first permanent group fission (in December 1994). The average group size decreased by nearly half between the study periods (10.5–5.6), while the frequency of group membership changes increased (2.0–8.3 times/year), and the birth rate decreased (0.56–0.38). Females, as well as males, immigrated into study groups and transferred between groups, something that has been rarely seen in this subspecies. We also found a significant decline in the amount of fruit from the earliest part of the study to the latter part of the study. Study groups did not switch to other types of foods during periods of fruit shortage, but traveled outside of their home range areas more often over the study period. Finally, the density E. f. rufus decreased in the study area while the densities of their main food competitors, Varecia variegata and Eulemur rubriventer, increased. Although few primate populations are numerically stable over time, we suggest that female behavioral responses to decreases in fruit availability may have influenced some of the demographic changes we witnessed in this study Titre du périodique : American Journal of Physical Anthropology Volume : 136 : 183-193 En ligne : https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20793 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Population Density and Home Range Size of Indri indri in a Protected Low Altitude Rain Forest / Kellie D. G. Glessner
Titre : Population Density and Home Range Size of Indri indri in a Protected Low Altitude Rain Forest Type de document : texte imprimé Auteurs : Kellie D. G. Glessner, Auteur ; Adam Britt, Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : POPULATION DENSITY HOME RANGE INDRI INDRI HABITAT DISTURBANCE CONSERVATION Résumé : We report the results of a census of Indri indri conducted in Betampona Nature Reserve, a lowland rain forest in eastern Madagascar. In addition, we conducted a year-long study of the ranging behavior of 3 groups in the southwestern region of the reserve. We used 2 methods to calculate population density and home range size, and to provide minimum and maximum estimates. Population density of Indri indri ranged from 6.9–13.2 individuals/km2 in Betampona. Mean home range size is 27 ha. The values for population density and home range size are intermediate between values for Indri indri in selectively logged and undisturbed montane rain forest. Our results suggest a relationship between habitat disturbance, population density and home range size for the species. Recent increases in habitat disturbance appear to cause an increase in population density and a decrease in home range size. The results are consistent with ones for other folivorous primate populations. Further research on habitat requirements of Indri and availability in Betampona is necessary to investigate the possibility of translocating Indri from nearby forest fragments into Betampona. Titre du périodique : International Journal of Primatology Volume : 26(4): 855-872 Population Density and Home Range Size of Indri indri in a Protected Low Altitude Rain Forest [texte imprimé] / Kellie D. G. Glessner, Auteur ; Adam Britt, Auteur . - 2005.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : POPULATION DENSITY HOME RANGE INDRI INDRI HABITAT DISTURBANCE CONSERVATION Résumé : We report the results of a census of Indri indri conducted in Betampona Nature Reserve, a lowland rain forest in eastern Madagascar. In addition, we conducted a year-long study of the ranging behavior of 3 groups in the southwestern region of the reserve. We used 2 methods to calculate population density and home range size, and to provide minimum and maximum estimates. Population density of Indri indri ranged from 6.9–13.2 individuals/km2 in Betampona. Mean home range size is 27 ha. The values for population density and home range size are intermediate between values for Indri indri in selectively logged and undisturbed montane rain forest. Our results suggest a relationship between habitat disturbance, population density and home range size for the species. Recent increases in habitat disturbance appear to cause an increase in population density and a decrease in home range size. The results are consistent with ones for other folivorous primate populations. Further research on habitat requirements of Indri and availability in Betampona is necessary to investigate the possibility of translocating Indri from nearby forest fragments into Betampona. Titre du périodique : International Journal of Primatology Volume : 26(4): 855-872 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Population dynamics of nocturnal lemurs in littoral forest fragments : The importance of long-term monitoring / Hyde Roberst, S, Rossizela, R., Longosoa, T. Strang, K., Chmurova, L., Nijman, V., Donati, G.
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Titre : Population dynamics of nocturnal lemurs in littoral forest fragments : The importance of long-term monitoring Type de document : texte imprimé Auteurs : Hyde Roberst, S, Rossizela, R., Longosoa, T. Strang, K., Chmurova, L., Nijman, V., Donati, G., Auteur Année de publication : 2021 Langues : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : AVAHI MERICIONALIS CHEIROGALEUS THOMASI HABITAT FRAGMENTATION MICROCEBUS TANOSI NOCTURNAL PRIMATE CONSERVATION POPULATION MONITORING Résumé : Habitat loss and fragmentation pose a significant threat to many primate species worldwide, yet community-level responses are complex and nuanced. Despite repeated calls from primatologists and the wider conservation community to increase monitoring initiatives that assess long-term population dynamics, such studies remain rare. Here we summarize results from a longitudinal study set in the littoral forests of southeast Madagascar. Littoral forests are a useful model for monitoring lemur population dynamics, as they are relatively well studied and their highly fragmented nature enables the effect of forest size and anthropogenic impacts to be examined. This study focuses on three Endangered nocturnal lemur species—Avahi meridionalis, Cheirogaleus thomasi, and Microcebus tanosi—across three forest fragments of different size and with different usage histories. Between 2011 and 2018, we walked 285 km of line transect and recorded 1968 lemur observations. Based on distance sampling analysis our results indicate that nocturnal lemurs respond to forest patch size and to levels of forest degradation in species-specific ways. The largest species, A. meridionalis, declined in density and encounter rate over time across the three study forests. C. thomasi populations appeared stable in all three fragments, with densities increasing in the most degraded forest. M. tanosi encounter rates were extremely low across all study fragments but were lowest in the most heavily degraded forest fragment. Our results emphasize the importance of localized pressures and species-specific responses on population dynamics. Monitoring population trends can provide an early warning signal of species loss and species-specific responses can inform crucial intervention strategies Titre du périodique : International Journal of Primatology Volume : 42(6): 833-858 En ligne : https://doi.org/10.1007/s10764-021-00270-y Population dynamics of nocturnal lemurs in littoral forest fragments : The importance of long-term monitoring [texte imprimé] / Hyde Roberst, S, Rossizela, R., Longosoa, T. Strang, K., Chmurova, L., Nijman, V., Donati, G., Auteur . - 2021.
Langues : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : AVAHI MERICIONALIS CHEIROGALEUS THOMASI HABITAT FRAGMENTATION MICROCEBUS TANOSI NOCTURNAL PRIMATE CONSERVATION POPULATION MONITORING Résumé : Habitat loss and fragmentation pose a significant threat to many primate species worldwide, yet community-level responses are complex and nuanced. Despite repeated calls from primatologists and the wider conservation community to increase monitoring initiatives that assess long-term population dynamics, such studies remain rare. Here we summarize results from a longitudinal study set in the littoral forests of southeast Madagascar. Littoral forests are a useful model for monitoring lemur population dynamics, as they are relatively well studied and their highly fragmented nature enables the effect of forest size and anthropogenic impacts to be examined. This study focuses on three Endangered nocturnal lemur species—Avahi meridionalis, Cheirogaleus thomasi, and Microcebus tanosi—across three forest fragments of different size and with different usage histories. Between 2011 and 2018, we walked 285 km of line transect and recorded 1968 lemur observations. Based on distance sampling analysis our results indicate that nocturnal lemurs respond to forest patch size and to levels of forest degradation in species-specific ways. The largest species, A. meridionalis, declined in density and encounter rate over time across the three study forests. C. thomasi populations appeared stable in all three fragments, with densities increasing in the most degraded forest. M. tanosi encounter rates were extremely low across all study fragments but were lowest in the most heavily degraded forest fragment. Our results emphasize the importance of localized pressures and species-specific responses on population dynamics. Monitoring population trends can provide an early warning signal of species loss and species-specific responses can inform crucial intervention strategies Titre du périodique : International Journal of Primatology Volume : 42(6): 833-858 En ligne : https://doi.org/10.1007/s10764-021-00270-y Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar / Volampeno, M.S.N., Masters, J.C., Downs, C.T.
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Titre : A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar Type de document : texte imprimé Auteurs : Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur Année de publication : 2010 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : BLUE EYED BLACK LEMUR TOTAL COUNT EULEMUR FLAVIFRONS MADAGASCAR POPULATION DENSITY SAHAMALAZA PENINSULA Résumé : The critically endangered blue-eyed black lemur (Eulemur flavifrons) has one of the smallest distributions of any lemur, occurring only in the north-western forests of Madagascar. We report the results of a population estimate of this taxon in part of the Ankarafa Forest, Sahamalaza-Iles Radama National Park, a dry deciduous forest. We collected data between September 2007 and February 2008 using a total count method with marked individuals and known groups. In all, 228 individuals comprising 29 groups were counted. Group sizes ranged from 4 to 11 individuals with a mean of 8 ± 1.8. We estimated population density to be 1.0 individual/ha or 97.3 individuals/km2 for our study area, which is higher than previous estimates reported for Ankarafa and other sites within the Sahamalaza Peninsula. Our mean group size, however, was similar to those determined in previous studies. Both group size and density of the blue-eyed black lemur were higher within the National Park than in previous studies outside the Park. Titre du périodique : Folia Primatologica Volume : 81:305-314 En ligne : DOI: 10.1159/000322231 A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar [texte imprimé] / Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur . - 2010.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : BLUE EYED BLACK LEMUR TOTAL COUNT EULEMUR FLAVIFRONS MADAGASCAR POPULATION DENSITY SAHAMALAZA PENINSULA Résumé : The critically endangered blue-eyed black lemur (Eulemur flavifrons) has one of the smallest distributions of any lemur, occurring only in the north-western forests of Madagascar. We report the results of a population estimate of this taxon in part of the Ankarafa Forest, Sahamalaza-Iles Radama National Park, a dry deciduous forest. We collected data between September 2007 and February 2008 using a total count method with marked individuals and known groups. In all, 228 individuals comprising 29 groups were counted. Group sizes ranged from 4 to 11 individuals with a mean of 8 ± 1.8. We estimated population density to be 1.0 individual/ha or 97.3 individuals/km2 for our study area, which is higher than previous estimates reported for Ankarafa and other sites within the Sahamalaza Peninsula. Our mean group size, however, was similar to those determined in previous studies. Both group size and density of the blue-eyed black lemur were higher within the National Park than in previous studies outside the Park. Titre du périodique : Folia Primatologica Volume : 81:305-314 En ligne : DOI: 10.1159/000322231 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Ranging Behavior and Possible Correlates of Pair-Living in Southeastern Avahis (Madagascar) / Ivan Norscia
Titre : Ranging Behavior and Possible Correlates of Pair-Living in Southeastern Avahis (Madagascar) Type de document : texte imprimé Auteurs : Ivan Norscia, Auteur ; Silvana M. Borgognini-Tarli, Auteur Année de publication : 2008 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : AVAHI LANIGER AVAHI MERIDIONALIS FOLIVORE MONOGAMY WOOLLY LEMUR Résumé : Researchers have proposed several hypotheses to explain pair-living in primates. In particular, when males are not involved in direct parental care, pair-living may be related to female dispersal, infanticide prevention, or male mate/resource defense. We aimed to evaluate, through a better understanding of the ranging patterns of avahis, which hypotheses may best account for pair-living in these nocturnal lemurs. We collected focal observations over 26 nights, June–September 2004, in a littoral forest (Sainte Luce, southeastern Madagascar) on 4 adult radiocollared avahis [Avahi laniger (Tattersall, I. (1982). The Primates of Madagascar. Columbia University Press, New York.) or Avahi meridionalis (Zaramody in Primate Reports 74:9–22, 2006)]. We followed 2 males and 2 females from 2 groups: B, a male-female couple, and A, comprising the parental pair and 1-yr-old female offspring. The adult females birthed in August. We recorded resting and feeding tree points (via global positioning system) for home range calculation through minimum convex polygon and kernel methods. We provide the first quantitative information on the ranging behavior of 2 male and 2 female avahis. Home range/daily path length values (means) are higher than the ones previously reported for the same and other folivorous pair-living lemur species. On average, the 2 females spent more time feeding and traveled shorter distances than the 2 males did. Male–female cohesion (mean values), possibly enhanced by offspring presence, was higher in A and after births than in B and before births, respectively. Although male avahis may be forced into pair-living owing to energy constraints related to size, locomotion, and diet, females might accept pair-living in exchange for indirect territory defense and mate guarding. Titre du périodique : International Journal of Primatology Volume : 29:153-171 Ranging Behavior and Possible Correlates of Pair-Living in Southeastern Avahis (Madagascar) [texte imprimé] / Ivan Norscia, Auteur ; Silvana M. Borgognini-Tarli, Auteur . - 2008.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : AVAHI LANIGER AVAHI MERIDIONALIS FOLIVORE MONOGAMY WOOLLY LEMUR Résumé : Researchers have proposed several hypotheses to explain pair-living in primates. In particular, when males are not involved in direct parental care, pair-living may be related to female dispersal, infanticide prevention, or male mate/resource defense. We aimed to evaluate, through a better understanding of the ranging patterns of avahis, which hypotheses may best account for pair-living in these nocturnal lemurs. We collected focal observations over 26 nights, June–September 2004, in a littoral forest (Sainte Luce, southeastern Madagascar) on 4 adult radiocollared avahis [Avahi laniger (Tattersall, I. (1982). The Primates of Madagascar. Columbia University Press, New York.) or Avahi meridionalis (Zaramody in Primate Reports 74:9–22, 2006)]. We followed 2 males and 2 females from 2 groups: B, a male-female couple, and A, comprising the parental pair and 1-yr-old female offspring. The adult females birthed in August. We recorded resting and feeding tree points (via global positioning system) for home range calculation through minimum convex polygon and kernel methods. We provide the first quantitative information on the ranging behavior of 2 male and 2 female avahis. Home range/daily path length values (means) are higher than the ones previously reported for the same and other folivorous pair-living lemur species. On average, the 2 females spent more time feeding and traveled shorter distances than the 2 males did. Male–female cohesion (mean values), possibly enhanced by offspring presence, was higher in A and after births than in B and before births, respectively. Although male avahis may be forced into pair-living owing to energy constraints related to size, locomotion, and diet, females might accept pair-living in exchange for indirect territory defense and mate guarding. Titre du périodique : International Journal of Primatology Volume : 29:153-171 Exemplaires
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Titre : Rapid decrease in populations of wild ring-tailed lemurs (Lemur catta) in Madagascar Type de document : texte imprimé Auteurs : M Lafleur ; T A Clarke ; K Reuter Année de publication : 2017 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : BUSMEAT LEMUR CATTA RING TAILED LEMUR MADAGASCAR EXTTINCTION PET TRADE Résumé : Lemurs are the most threatened group of mammals on earth. Lemur catta (ring-tailed lemur) represents one of the most iconic lemur species and faces numerous anthropogenic threats in the wild. In this study, we present population estimates from 32 sites across the range of L. catta, collected from primary and secondary data sources, to assess the number of ring-tailed lemurs left in the wild. We estimate that there are approximately 2,220 individual L. catta remaining in the 32 sites considered. We note local extinctions of populations of L. catta in at least 12 of the 32 sites examined, and that significantly more extinctions occurred in areas without some form of protection. This decrease in extant populations could represent a decrease of more than 95% of all ring-tailed lemurs in Madagascar since the year 2000. While these results should be considered preliminary, we stress the rapid decline of the species and note that habitat loss, bushmeat hunting and the illegal pet trade are driving populations to local extinction. Based on the data presented here, urgent and immediate funding and conservation action are crucial to ensure the viability of the remaining wild populations of ring-tailed lemurs. Titre du périodique : Folia Primatologica Volume : 87 (5): 320-330 En ligne : https://doi.org/10.1159/000455121 Rapid decrease in populations of wild ring-tailed lemurs (Lemur catta) in Madagascar [texte imprimé] / M Lafleur ; T A Clarke ; K Reuter . - 2017.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : BUSMEAT LEMUR CATTA RING TAILED LEMUR MADAGASCAR EXTTINCTION PET TRADE Résumé : Lemurs are the most threatened group of mammals on earth. Lemur catta (ring-tailed lemur) represents one of the most iconic lemur species and faces numerous anthropogenic threats in the wild. In this study, we present population estimates from 32 sites across the range of L. catta, collected from primary and secondary data sources, to assess the number of ring-tailed lemurs left in the wild. We estimate that there are approximately 2,220 individual L. catta remaining in the 32 sites considered. We note local extinctions of populations of L. catta in at least 12 of the 32 sites examined, and that significantly more extinctions occurred in areas without some form of protection. This decrease in extant populations could represent a decrease of more than 95% of all ring-tailed lemurs in Madagascar since the year 2000. While these results should be considered preliminary, we stress the rapid decline of the species and note that habitat loss, bushmeat hunting and the illegal pet trade are driving populations to local extinction. Based on the data presented here, urgent and immediate funding and conservation action are crucial to ensure the viability of the remaining wild populations of ring-tailed lemurs. Titre du périodique : Folia Primatologica Volume : 87 (5): 320-330 En ligne : https://doi.org/10.1159/000455121 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Seasonal feeding ecology of ring-tailed lemurs: A comparison of spiny and galerry forest habitats / LaFleur, M., Sauther, M.L.
Titre : Seasonal feeding ecology of ring-tailed lemurs: A comparison of spiny and galerry forest habitats Type de document : texte imprimé Auteurs : LaFleur, M., Sauther, M.L., Auteur Année de publication : 2015 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : MADAGASCAR PLANT FOODS HABITAT TYPES BEZA MAHAFALY SPECIAL RESERVE TSIMANAMPESOTSE NATIONAL PARK MACRONUTRIENTS PLANT CHEMISTRY Résumé : Although Lemur catta persists in many habitat types in southern Madagascar, its ecology has been primarily studied within gallery forests. We compare plant food selection and properties for ring-tailed lemurs in the spiny and gallery forests over the synchronized lactation period (September to March) that includes both the dry and wet seasons. We found no significant habitat-specific differences in the type of plant part consumed per month (i.e. flower, fruit, leaf) or between the intake of soluble carbohydrates. However, the presence and use of Tamarindus indica plants appear to elevate protein and fiber intake in the gallery forest lemurs' diets. Protein is especially important for reproductive females who incur the added metabolic costs associated with lactation; however, fiber can disrupt protein digestion. Future work should continue to investigate how variations of protein and fiber affect ring-tailed lemur dietary choice and nutrient acquisition. Seasonal feeding ecology of ring-tailed lemurs: A comparison of spiny and galerry forest habitats [texte imprimé] / LaFleur, M., Sauther, M.L., Auteur . - 2015.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : MADAGASCAR PLANT FOODS HABITAT TYPES BEZA MAHAFALY SPECIAL RESERVE TSIMANAMPESOTSE NATIONAL PARK MACRONUTRIENTS PLANT CHEMISTRY Résumé : Although Lemur catta persists in many habitat types in southern Madagascar, its ecology has been primarily studied within gallery forests. We compare plant food selection and properties for ring-tailed lemurs in the spiny and gallery forests over the synchronized lactation period (September to March) that includes both the dry and wet seasons. We found no significant habitat-specific differences in the type of plant part consumed per month (i.e. flower, fruit, leaf) or between the intake of soluble carbohydrates. However, the presence and use of Tamarindus indica plants appear to elevate protein and fiber intake in the gallery forest lemurs' diets. Protein is especially important for reproductive females who incur the added metabolic costs associated with lactation; however, fiber can disrupt protein digestion. Future work should continue to investigate how variations of protein and fiber affect ring-tailed lemur dietary choice and nutrient acquisition. Exemplaires
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Titre : Seasonal variation in positional behavior of malagasy lemurs Type de document : texte imprimé Auteurs : Dagosto, M., Auteur Année de publication : 1995 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : EULEMUR PROPITHECUS VARECIA MADAGASCAR POSITIONAL BEHAVIOR LOCOMOTION Résumé : I describe the positional behavior of four species of Malagasy lemur (Propithecus diadema, Eulemur fulvus rufus, Eulemur rubriventer,and Varecia variegata)at two times of year at Ranomafana National Park,Madagascar. There were significant seasonal differences in locomotor behavior in all species except P. diademaAmong the lemurids, leaping was more frequent and quadrupedism less frequent in the dry season. Only E. rubriventerexhibited seasonal differences in posture, and there were few seasonal differences in support use. The observed differences in positional behavior were not the result of differences in activity budget or in microhabitat use attributable to seasonal variation in resource use. Titre du périodique : International Journal of Primatology Volume : 16: 807-833 En ligne : https://doi.org/10.1007/BF02735721 Seasonal variation in positional behavior of malagasy lemurs [texte imprimé] / Dagosto, M., Auteur . - 1995.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : EULEMUR PROPITHECUS VARECIA MADAGASCAR POSITIONAL BEHAVIOR LOCOMOTION Résumé : I describe the positional behavior of four species of Malagasy lemur (Propithecus diadema, Eulemur fulvus rufus, Eulemur rubriventer,and Varecia variegata)at two times of year at Ranomafana National Park,Madagascar. There were significant seasonal differences in locomotor behavior in all species except P. diademaAmong the lemurids, leaping was more frequent and quadrupedism less frequent in the dry season. Only E. rubriventerexhibited seasonal differences in posture, and there were few seasonal differences in support use. The observed differences in positional behavior were not the result of differences in activity budget or in microhabitat use attributable to seasonal variation in resource use. Titre du périodique : International Journal of Primatology Volume : 16: 807-833 En ligne : https://doi.org/10.1007/BF02735721 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur / Eric, R. Patel
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Titre : Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur Type de document : texte imprimé Auteurs : Eric, R. Patel, Auteur Année de publication : 2012 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROPITHECUS CANDIDUS VOCALIZATIONS ALARM CALL Résumé : Vocalizations of Madagascar’s lemurs have generally been less investigated than those of other primate groups, with virtually no information available about calling in the silky sifaka (Propithecus candidus), a large rainforest species. Current work examined the “zzuss” vocalization, one of the most common and loudest sounds produced by this monomorphic species, and included 160 calls from nine adults (five males, four females) in three groups. Analyses focused on overall acoustic features, individual and sex differences, call usage, and likely function. Acoustically, the calls included separable turbulent noise and tonal components, with the later often marked by frequency jumps and dramatic frequency modulation. Male and female zzuss calls differed most in F0- and amplitude-related features, characteristics that are relatively unconstrained by overall body size. All measures differed among individual callers, with F0-related variables again playing the largest role. Based on usage, these calls most likely function both as generalized alarm and group-coordination signals. The sounds were thus of interest in several regards, including showing sexual differentiation in the absence of other dimorphisms, exhibiting primarily F0-based differentiation in both sex- and individual-based comparisons, and combining apparent alarm and coordination functions across a variety of contexts Titre du périodique : The Journal of the Acoustical Society of America Volume : 132 (3): 1799-810 En ligne : https://doi.org/10.1121/1.4740475 Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur [texte imprimé] / Eric, R. Patel, Auteur . - 2012.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : PROPITHECUS CANDIDUS VOCALIZATIONS ALARM CALL Résumé : Vocalizations of Madagascar’s lemurs have generally been less investigated than those of other primate groups, with virtually no information available about calling in the silky sifaka (Propithecus candidus), a large rainforest species. Current work examined the “zzuss” vocalization, one of the most common and loudest sounds produced by this monomorphic species, and included 160 calls from nine adults (five males, four females) in three groups. Analyses focused on overall acoustic features, individual and sex differences, call usage, and likely function. Acoustically, the calls included separable turbulent noise and tonal components, with the later often marked by frequency jumps and dramatic frequency modulation. Male and female zzuss calls differed most in F0- and amplitude-related features, characteristics that are relatively unconstrained by overall body size. All measures differed among individual callers, with F0-related variables again playing the largest role. Based on usage, these calls most likely function both as generalized alarm and group-coordination signals. The sounds were thus of interest in several regards, including showing sexual differentiation in the absence of other dimorphisms, exhibiting primarily F0-based differentiation in both sex- and individual-based comparisons, and combining apparent alarm and coordination functions across a variety of contexts Titre du périodique : The Journal of the Acoustical Society of America Volume : 132 (3): 1799-810 En ligne : https://doi.org/10.1121/1.4740475 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Spatial variation in density and total size estimates in fragmented primate populations: the golden-crowned sifaka (Propithecus tattersalli) / Erwan Quéméré
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Titre : Spatial variation in density and total size estimates in fragmented primate populations: the golden-crowned sifaka (Propithecus tattersalli) Type de document : texte imprimé Auteurs : Erwan Quéméré, Auteur ; Julie Champeau, Auteur ; Aubin Besolo, Auteur ; Emmanuel Rasolondraibe, Auteur ; Clément Rabarivola, Auteur ; Brigitte Crouau-Roy, Auteur ; Lounès Chikhi, Auteur Année de publication : 2009 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : GOLDEN-CROWNED SIFAKA PROPITHECUS TATTERSALLI HABITAT FRAGMENTATION ABUNDANCE EDGE EFFECT Résumé : The golden-crowned sifaka (Propithecus tattersalli) is an endangered lemur species found only in the Daraina region, a very restricted area in north-eastern Madagascar. Its forest habitat is highly fragmented and expected to suffer from significant changes in the near future. The species is poorly known and only one census study, carried out in 2000, has ever been published. It is thus crucial to update the conservation status of the golden-crowned sifaka before major anthropogenic environmental changes take place. Using the line-transect approach, we estimated the species density in the main forest fragments located in both the peripheral and central parts of the distribution range, including both protected and unprotected areas. In parallel, we tried to determine whether an edge effect could be detected by comparing densities at different distances from the forest edges. We found important variation of sifaka densities among forest fragments. The total species abundance is thus difficult to determine, but we estimated that it is likely to be over 18,000, two to three times higher than previously thought. However, our data also suggested that most P. tattersalli live in forests located in the central part of the distribution range and that the estimated densities in the central part were high (>80 individuals/km2). Two forest fragments, found to host a large part of the total population, are currently outside the managed area and their incorporation to the managed area is strongly recommended. Lastly, as expected for a folivorous and not heavily hunted species, our results are consistent with the hypothesis that this species does not experience a clear edge effect, at least during the first half of the dry season. This could be due to a high resiliency to habitat fragmentation or to the fact that fragmentation has been going on for some time. Titre du périodique : American Journal of Primatology Volume : 72: 72-80 En ligne : https://doi.org/10.1002/ajp.20754 Spatial variation in density and total size estimates in fragmented primate populations: the golden-crowned sifaka (Propithecus tattersalli) [texte imprimé] / Erwan Quéméré, Auteur ; Julie Champeau, Auteur ; Aubin Besolo, Auteur ; Emmanuel Rasolondraibe, Auteur ; Clément Rabarivola, Auteur ; Brigitte Crouau-Roy, Auteur ; Lounès Chikhi, Auteur . - 2009.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : GOLDEN-CROWNED SIFAKA PROPITHECUS TATTERSALLI HABITAT FRAGMENTATION ABUNDANCE EDGE EFFECT Résumé : The golden-crowned sifaka (Propithecus tattersalli) is an endangered lemur species found only in the Daraina region, a very restricted area in north-eastern Madagascar. Its forest habitat is highly fragmented and expected to suffer from significant changes in the near future. The species is poorly known and only one census study, carried out in 2000, has ever been published. It is thus crucial to update the conservation status of the golden-crowned sifaka before major anthropogenic environmental changes take place. Using the line-transect approach, we estimated the species density in the main forest fragments located in both the peripheral and central parts of the distribution range, including both protected and unprotected areas. In parallel, we tried to determine whether an edge effect could be detected by comparing densities at different distances from the forest edges. We found important variation of sifaka densities among forest fragments. The total species abundance is thus difficult to determine, but we estimated that it is likely to be over 18,000, two to three times higher than previously thought. However, our data also suggested that most P. tattersalli live in forests located in the central part of the distribution range and that the estimated densities in the central part were high (>80 individuals/km2). Two forest fragments, found to host a large part of the total population, are currently outside the managed area and their incorporation to the managed area is strongly recommended. Lastly, as expected for a folivorous and not heavily hunted species, our results are consistent with the hypothesis that this species does not experience a clear edge effect, at least during the first half of the dry season. This could be due to a high resiliency to habitat fragmentation or to the fact that fragmentation has been going on for some time. Titre du périodique : American Journal of Primatology Volume : 72: 72-80 En ligne : https://doi.org/10.1002/ajp.20754 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Suivi Nutritionel de trois espèces de lémuriens dans deux parcs zoologiques de Madagascar / Tsiky Hariniaina RAJAONARIVELO
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Titre : Suivi Nutritionel de trois espèces de lémuriens dans deux parcs zoologiques de Madagascar Type de document : texte imprimé Auteurs : Tsiky Hariniaina RAJAONARIVELO, Auteur Editeur : Universite d'Antananarivo (Faculte de Medecine) Année de publication : 2013 Importance : 87 p. Présentation : 76 réf.; 24 ill.; 28 tab. Note générale : Thèse de Doctorat Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIENS NUTRITION EULEMUR FLAVIFRONS, EULEMUR RUBRIVENTER VARECIA VARIEGATA CAPTVITE MADAGASCAR Résumé : La nutrition est un facteur clef de réussite de l’élevage en captivité. Elle contribue au bien-être et à la santé animale. Cependant, l’étude nutritionnelle du régime alimentaire dans ces milieux est peu nombreuse surtout pour le cas des Lémuriens de Madagascar. Nous avons étudiés trois espèces frugivores : Eulemur flavifrons, Eulemur
rubriventer, Varecia variegata classées critiquement en danger selon l’IUCN et élevées au Parc Zoologique d’Ivoloina (PZI) et au Parc Botanique et Zoologique de Tsimbazaza (PBZT). De plus, la catégorie alimentaire auxquelles elles appartiennent, est la plus représentée en captivité. Les deux institutions situées dans deux régions différentes, ont
été comparés pour voir si l’apport en énergie, en protéine, en lipide, en glucide et en fibre du régime seraient identiques. Pour ce faire, le poids vif a été relevé mensuellement, la quantité de la ration a été évaluée et l’apport nutritionnel ingéré a été déterminé. Il a été constaté que seul l’apport en matière sèche pour l’espèce Eulemur
flavifrons a été significativement différent pour lequel on note un excédant au niveau du PZI. Les analyses nutritionnelles ont permis de constater une similarité dans l’apport énergétique et protéique pour l’Eulemur flavifrons ; glucidique et en fibre pour l’Eulemur rubriventer ; énergétique, lipidique et glucidique pour le Varecia variegata.
Les résultats de l’étude ont permis de voir que les rations des espèces nécessitent une correction afin de remédier à l’excès de glucide et au manque de protéine par rapport à leurs véritables besoins.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rajaonariveloTsikyH_MED_VET_13.pdf Suivi Nutritionel de trois espèces de lémuriens dans deux parcs zoologiques de Madagascar [texte imprimé] / Tsiky Hariniaina RAJAONARIVELO, Auteur . - Universite d'Antananarivo (Faculte de Medecine), 2013 . - 87 p. : 76 réf.; 24 ill.; 28 tab.
Thèse de Doctorat
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIENS NUTRITION EULEMUR FLAVIFRONS, EULEMUR RUBRIVENTER VARECIA VARIEGATA CAPTVITE MADAGASCAR Résumé : La nutrition est un facteur clef de réussite de l’élevage en captivité. Elle contribue au bien-être et à la santé animale. Cependant, l’étude nutritionnelle du régime alimentaire dans ces milieux est peu nombreuse surtout pour le cas des Lémuriens de Madagascar. Nous avons étudiés trois espèces frugivores : Eulemur flavifrons, Eulemur
rubriventer, Varecia variegata classées critiquement en danger selon l’IUCN et élevées au Parc Zoologique d’Ivoloina (PZI) et au Parc Botanique et Zoologique de Tsimbazaza (PBZT). De plus, la catégorie alimentaire auxquelles elles appartiennent, est la plus représentée en captivité. Les deux institutions situées dans deux régions différentes, ont
été comparés pour voir si l’apport en énergie, en protéine, en lipide, en glucide et en fibre du régime seraient identiques. Pour ce faire, le poids vif a été relevé mensuellement, la quantité de la ration a été évaluée et l’apport nutritionnel ingéré a été déterminé. Il a été constaté que seul l’apport en matière sèche pour l’espèce Eulemur
flavifrons a été significativement différent pour lequel on note un excédant au niveau du PZI. Les analyses nutritionnelles ont permis de constater une similarité dans l’apport énergétique et protéique pour l’Eulemur flavifrons ; glucidique et en fibre pour l’Eulemur rubriventer ; énergétique, lipidique et glucidique pour le Varecia variegata.
Les résultats de l’étude ont permis de voir que les rations des espèces nécessitent une correction afin de remédier à l’excès de glucide et au manque de protéine par rapport à leurs véritables besoins.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rajaonariveloTsikyH_MED_VET_13.pdf Exemplaires
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Titre : The breeding system of wild red ruffed lemurs (Varecia rubra): a preliminary report Type de document : texte imprimé Auteurs : Vasey, N., Auteur Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ABSENTEE PARENTING ALLOPARENTING COOPERATIVE BREEDING INFANT DEVELOPMENT MATING SYSTEM Résumé : Captive studies have shown that ruffed lemurs (Varecia) have an unusual suite of reproductive traits combined with extremely high maternal reproductive costs. These traits include the bearing of litters, nesting of altricial young, and absentee parenting. To characterize the breeding system of this enigmatic lemur, reproductive traits must be contextualized in the wild. Here, I provide a preliminary report of mating and infant care in one community of wild red ruffed lemurs (Varecia rubra). Observations span a 15-month period covering two birth seasons and one mating season on the Masoala Peninsula, Madagascar. Factors that are not possible to replicate in captivity are reported, such as mating pattern, natality and mortality rates, the location of nests within the home range, and the structuring of infant care within a natural community. V. rubra at Andranobe have a fission-fusion, multifemale-multimale grouping pattern and a polygamous mating system. They do not mate monogamously or live strictly in family-based groups as suggested by previous workers. During the first 2 months of life, nests and infant stashing localities are situated within each mother’s respective core area, and inhabitants of each core area within the communal home range provide care for young. As part of their absentee parenting system, infants are left in concealed, protected, and supportive spots high in the canopy, while mothers travel distantly. This practice is termed ‘infant stashing’. Alloparenting appears to be an integral part of V. rubra’s overall reproductive strategy in the wild, as it was performed by all age-sex classes. Among the alloparental behaviors observed were infant guarding, co-stashing, infant transport, and allonursing. Alloparenting and absentee parenting may mitigate high maternal reproductive costs. Furthermore, V. rubra may have a breeding system in which genetic partners (i.e., mating partners) do not always correspond to infant care-providers. Combined with recently available information on the behavioral ecology of wild ruffed lemurs, this preliminary report suggests directions for in-depth studies on Varecia’s breeding system. Titre du périodique : Primates Volume : 48: 41-54 En ligne : https://doi.org/10.1007/s10329-006-0010-5 The breeding system of wild red ruffed lemurs (Varecia rubra): a preliminary report [texte imprimé] / Vasey, N., Auteur . - 2006.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ABSENTEE PARENTING ALLOPARENTING COOPERATIVE BREEDING INFANT DEVELOPMENT MATING SYSTEM Résumé : Captive studies have shown that ruffed lemurs (Varecia) have an unusual suite of reproductive traits combined with extremely high maternal reproductive costs. These traits include the bearing of litters, nesting of altricial young, and absentee parenting. To characterize the breeding system of this enigmatic lemur, reproductive traits must be contextualized in the wild. Here, I provide a preliminary report of mating and infant care in one community of wild red ruffed lemurs (Varecia rubra). Observations span a 15-month period covering two birth seasons and one mating season on the Masoala Peninsula, Madagascar. Factors that are not possible to replicate in captivity are reported, such as mating pattern, natality and mortality rates, the location of nests within the home range, and the structuring of infant care within a natural community. V. rubra at Andranobe have a fission-fusion, multifemale-multimale grouping pattern and a polygamous mating system. They do not mate monogamously or live strictly in family-based groups as suggested by previous workers. During the first 2 months of life, nests and infant stashing localities are situated within each mother’s respective core area, and inhabitants of each core area within the communal home range provide care for young. As part of their absentee parenting system, infants are left in concealed, protected, and supportive spots high in the canopy, while mothers travel distantly. This practice is termed ‘infant stashing’. Alloparenting appears to be an integral part of V. rubra’s overall reproductive strategy in the wild, as it was performed by all age-sex classes. Among the alloparental behaviors observed were infant guarding, co-stashing, infant transport, and allonursing. Alloparenting and absentee parenting may mitigate high maternal reproductive costs. Furthermore, V. rubra may have a breeding system in which genetic partners (i.e., mating partners) do not always correspond to infant care-providers. Combined with recently available information on the behavioral ecology of wild ruffed lemurs, this preliminary report suggests directions for in-depth studies on Varecia’s breeding system. Titre du périodique : Primates Volume : 48: 41-54 En ligne : https://doi.org/10.1007/s10329-006-0010-5 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire The effects of climate seasonality on behaviour and sleeping site choice in Sahamalaza sportive lemurs, Lepilemur sahamalaza / Mandl, I., Holderied, M., Schwitzer, C
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Titre : The effects of climate seasonality on behaviour and sleeping site choice in Sahamalaza sportive lemurs, Lepilemur sahamalaza Type de document : texte imprimé Auteurs : Mandl, I., Holderied, M., Schwitzer, C, Auteur Année de publication : 2018 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ADAPTATION BEHAVIOR NOCTURNAL SEASONAL STREPSIRRHINES Résumé : Temperature, rainfall, and resource availability may vary greatly within a single year in primate habitats. Many primate species show behavioral and physiological adaptations to this environmental seasonality, including changes to their diets and activity. Sahamalaza sportive lemurs (Lepilemur sahamalaza) inhabit the northwest of Madagascar and have been studied only during the dry, colder period of the year. We investigated potential effects of climate seasonality on this species by collecting behavioral data between October 2015 and August 2016, encompassing both the warmer wet and the colder dry seasons. We collected 773.15 hours of behavioral data on 14 individual sportive lemurs to investigate year-round activity budgets, ranging behavior, and sleeping site locations. Additionally we recorded temperature and rainfall data at our study site to describe the environmental conditions during the study period. The study individuals significantly decreased their time spent traveling and increased their time spent resting in the dry season compared to the wet season. Although home range size and path lengths did not differ over the study period, sleeping locations were significantly different between seasons as the lemurs focused on more confined areas in colder periods. Overall, the results indicate that Sahamalaza sportive lemur behavior varies with season, in line with reports for other primates. Titre du périodique : International Journal of Primatology Volume : 39 (1039-1067) En ligne : https://doi.org/10.1007/s10764-018-0059-1 The effects of climate seasonality on behaviour and sleeping site choice in Sahamalaza sportive lemurs, Lepilemur sahamalaza [texte imprimé] / Mandl, I., Holderied, M., Schwitzer, C, Auteur . - 2018.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : ADAPTATION BEHAVIOR NOCTURNAL SEASONAL STREPSIRRHINES Résumé : Temperature, rainfall, and resource availability may vary greatly within a single year in primate habitats. Many primate species show behavioral and physiological adaptations to this environmental seasonality, including changes to their diets and activity. Sahamalaza sportive lemurs (Lepilemur sahamalaza) inhabit the northwest of Madagascar and have been studied only during the dry, colder period of the year. We investigated potential effects of climate seasonality on this species by collecting behavioral data between October 2015 and August 2016, encompassing both the warmer wet and the colder dry seasons. We collected 773.15 hours of behavioral data on 14 individual sportive lemurs to investigate year-round activity budgets, ranging behavior, and sleeping site locations. Additionally we recorded temperature and rainfall data at our study site to describe the environmental conditions during the study period. The study individuals significantly decreased their time spent traveling and increased their time spent resting in the dry season compared to the wet season. Although home range size and path lengths did not differ over the study period, sleeping locations were significantly different between seasons as the lemurs focused on more confined areas in colder periods. Overall, the results indicate that Sahamalaza sportive lemur behavior varies with season, in line with reports for other primates. Titre du périodique : International Journal of Primatology Volume : 39 (1039-1067) En ligne : https://doi.org/10.1007/s10764-018-0059-1 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation / Ellwanger N, Gould L
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Titre : Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation Type de document : texte imprimé Auteurs : Ellwanger N, Gould L, Auteur Année de publication : 2011 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMUR CATTA SPINY FOREST GALLERY FOREST ACTIVITY BUDGET , BEHAVIOURAL FLEXIBILITY Résumé : Implementing effective primate conservation strategies requires knowledge of species’ ecological and behavioural parameters. The protection of all habitat types required for preserving viable dispersion and gene flow between disparate populations necessitates a thorough understanding of the behavioural flexibility of a species. Ring-tailed lemurs Lemur catta inhabit a plethora of habitats throughout southern Madagascar but, hitherto, research has been restricted primarily to riverine gallery forests. The present study presents comparative data on the activity budgets and foraging behaviour of 2 L. catta groups living in different habitats at Berenty Reserve, Madagascar. Data were collected for 2 mo on groups living in a xerophytic spiny forest and a riverine gallery forest. The spiny forest group spent significantly more time in inactive behaviours compared with the gallery forest group. This strategy of apparent energy minimization allows L. catta to thermoregulate despite decreased water availability and high ambient temperatures. The spiny forest group spent significantly more time feeding on small fruits of succulent trees, which we associate with the group’s significantly higher rate of feeding agonism compared with the gallery forest group. These results demonstrate the high behavioural and ecological flexibility of L. catta, suggesting that xerophytic spiny forests might be a vital habitat type for L. catta conservation efforts. Future research should advance knowledge of the resources needed to sustain L. catta populations in other xerophytic spiny forests. Titre du périodique : Endangered Species Research Volume : 14:259-270 En ligne : https://doi.org/10.3354/esr00362 Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation [texte imprimé] / Ellwanger N, Gould L, Auteur . - 2011.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMUR CATTA SPINY FOREST GALLERY FOREST ACTIVITY BUDGET , BEHAVIOURAL FLEXIBILITY Résumé : Implementing effective primate conservation strategies requires knowledge of species’ ecological and behavioural parameters. The protection of all habitat types required for preserving viable dispersion and gene flow between disparate populations necessitates a thorough understanding of the behavioural flexibility of a species. Ring-tailed lemurs Lemur catta inhabit a plethora of habitats throughout southern Madagascar but, hitherto, research has been restricted primarily to riverine gallery forests. The present study presents comparative data on the activity budgets and foraging behaviour of 2 L. catta groups living in different habitats at Berenty Reserve, Madagascar. Data were collected for 2 mo on groups living in a xerophytic spiny forest and a riverine gallery forest. The spiny forest group spent significantly more time in inactive behaviours compared with the gallery forest group. This strategy of apparent energy minimization allows L. catta to thermoregulate despite decreased water availability and high ambient temperatures. The spiny forest group spent significantly more time feeding on small fruits of succulent trees, which we associate with the group’s significantly higher rate of feeding agonism compared with the gallery forest group. These results demonstrate the high behavioural and ecological flexibility of L. catta, suggesting that xerophytic spiny forests might be a vital habitat type for L. catta conservation efforts. Future research should advance knowledge of the resources needed to sustain L. catta populations in other xerophytic spiny forests. Titre du périodique : Endangered Species Research Volume : 14:259-270 En ligne : https://doi.org/10.3354/esr00362 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation / Nicholas Ellwange
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Titre : Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation Type de document : texte imprimé Auteurs : Nicholas Ellwange, Auteur ; Lisa Gould, Auteur Année de publication : 2011 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMUR CATTA SPINY FOREST GALLERY FOREST ACTIVITY BUDGET BEHAVIOURAL FLEXIBILITY Résumé : Implementing effective primate conservation strategies requires knowledge of species’ ecological and behavioural parameters. The protection of all habitat types required for preserving viable dispersion and gene flow between disparate populations necessitates a thorough understanding of the behavioural flexibility of a species. Ring-tailed lemurs Lemur catta inhabit a plethora of habitats throughout southern Madagascar but, hitherto, research has been restricted primarily to riverine gallery forests. The present study presents comparative data on the activity budgets and foraging behaviour of 2 L. catta groups living in different habitats at Berenty Reserve, Madagascar. Data were collected for 2 mo on groups living in a xerophytic spiny forest and a riverine gallery forest. The spiny forest group spent significantly more time in inactive behaviours compared with the gallery forest group. This strategy of apparent energy minimization allows L. catta to thermoregulate despite decreased water availability and high ambient temperatures. The spiny forest group spent significantly more time feeding on small fruits of succulent trees, which we associate with the group’s significantly higher rate of feeding agonism compared with the gallery forest group. These results demonstrate the high behavioural and ecological flexibility of L. catta, suggesting that xerophytic spiny forests might be a vital habitat type for L. catta conservation efforts. Future research should advance knowledge of the resources needed to sustain L. catta populations in other xerophytic spiny forests Titre du périodique : Endangered Species Research Volume : 14:259-270 En ligne : https://doi.org/10.3354/esr00362 Variations in behavioural patterns between Lemur catta groups living in different forest types: implications for conservation [texte imprimé] / Nicholas Ellwange, Auteur ; Lisa Gould, Auteur . - 2011.
Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMUR CATTA SPINY FOREST GALLERY FOREST ACTIVITY BUDGET BEHAVIOURAL FLEXIBILITY Résumé : Implementing effective primate conservation strategies requires knowledge of species’ ecological and behavioural parameters. The protection of all habitat types required for preserving viable dispersion and gene flow between disparate populations necessitates a thorough understanding of the behavioural flexibility of a species. Ring-tailed lemurs Lemur catta inhabit a plethora of habitats throughout southern Madagascar but, hitherto, research has been restricted primarily to riverine gallery forests. The present study presents comparative data on the activity budgets and foraging behaviour of 2 L. catta groups living in different habitats at Berenty Reserve, Madagascar. Data were collected for 2 mo on groups living in a xerophytic spiny forest and a riverine gallery forest. The spiny forest group spent significantly more time in inactive behaviours compared with the gallery forest group. This strategy of apparent energy minimization allows L. catta to thermoregulate despite decreased water availability and high ambient temperatures. The spiny forest group spent significantly more time feeding on small fruits of succulent trees, which we associate with the group’s significantly higher rate of feeding agonism compared with the gallery forest group. These results demonstrate the high behavioural and ecological flexibility of L. catta, suggesting that xerophytic spiny forests might be a vital habitat type for L. catta conservation efforts. Future research should advance knowledge of the resources needed to sustain L. catta populations in other xerophytic spiny forests Titre du périodique : Endangered Species Research Volume : 14:259-270 En ligne : https://doi.org/10.3354/esr00362 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Variations microgeographiques et bioacoustiques de Lepilemur edwardsi (Geoffrey, 1858) dans la parc national Ankarafantsika (Region Nord-Ouest de Madagascar) / Andriatahiana Zatovonirina Rabesandratana
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Titre : Variations microgeographiques et bioacoustiques de Lepilemur edwardsi (Geoffrey, 1858) dans la parc national Ankarafantsika (Region Nord-Ouest de Madagascar) Type de document : texte imprimé Auteurs : Andriatahiana Zatovonirina Rabesandratana, Auteur Editeur : Université d'Antananarivo (Faculté des Sciences) Année de publication : 2006 Importance : 310 p. Présentation : x réf.; 30 ill.; 43 tab. Note générale : Thèse de Doctorat Langues : Français (fre) Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIEN NOCTURNE LEPILEMUR EDWARDSI MORPHOMETRIE BIOACOUSTIQUE COMPORTEMENT PARC NATIONAL ANKARAFANTSIKA MADAGASCAR Résumé : Les Lémuriens nocturnes sont parmi les primates menacés par les dangers dus à
la dégradation incessante de l’environnement et des écosystèmes. C’est le cas de Lépilemur
de Milne-Edwards (Lepilemur edwardsi), objet de notre étude, un lémurien nocturne qui a la
taille d’un chat. Le Site d’études est la seule distribution continue de cette espèce qui subsiste
au nord-ouest de Madagascar, le parc National Ankafantsika(PNA) et ses alentours. 9 sites,
répartis dans le PNA ont été choisis plus un 10 ème, Ampijoroa, comme site de référence (sur
les études de comportement seulement), pour réaliser ces études, afin d’éclaircir les
problèmes relatifs à sa distribution , son abondance, son éthologie, sa bioacoustique et surtout
de promouvoir, en sa faveur, une conservation efficace ; Les périodes d’étude s’étendent de
mai à Octobre 2003 et de mai à Octobre 2004 ; Pour la première fois une tentative
d’explication sera entreprise dans ces études sur la distribution et l’abondance de Lepilemur
edwardsi dans le PNA, par la méthode des transects et des recensements nocturnes. La densité
relative de lepilemur edwardsi dans le PNA est relativement faible (O-3 individus/km)par
rapport à Ampijoroa ; La radiotélémétrie a permis d récolter des données comportementales
de 42 individus répartis dans 8 sites, d’enregistrer leur vocalisation et d’établir les contextes
des cris ; Les Analyses morphométriques et bioacoustiques ont monté qu’il n’y a pas de
différence entre les mâles et les femelles dans chaque site ; ce qui a permis de comparer les
sites. Il y a beaucoup de similarités morphométriques eet acoustiques de l’espèce étudiée dans
8 sites du PNA. Il peut en être déduit que Lepilemur edwardsi y forme une seule
métapopulation . Cependant, quelques variables morphométriques semblent être significatives
par l’effet des sites et elles sont dues probablement à des adaptations particulières des
populations à des types d’habitat local. Les contextes des cri ont permis d’évaluer leur
symétrie temporelle entre ceux du matin et ceux du soir. Un statut de conservation de rang
pus élevé est alors proposé pour lepilemur edwardsi du fait de sa densité faible le PNA,
compte tenu de sa reproduction très limitée et des incessantes menaces de perte d’habitat et de
braconnage.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rabesandratanaaz_sn_doc3_06.pdf Variations microgeographiques et bioacoustiques de Lepilemur edwardsi (Geoffrey, 1858) dans la parc national Ankarafantsika (Region Nord-Ouest de Madagascar) [texte imprimé] / Andriatahiana Zatovonirina Rabesandratana, Auteur . - Université d'Antananarivo (Faculté des Sciences), 2006 . - 310 p. : x réf.; 30 ill.; 43 tab.
Thèse de Doctorat
Langues : Français (fre)
Catégories : LEMURIENS
LEMURIENS:Biologie, Ecologie, DensitéMots-clés : LEMURIEN NOCTURNE LEPILEMUR EDWARDSI MORPHOMETRIE BIOACOUSTIQUE COMPORTEMENT PARC NATIONAL ANKARAFANTSIKA MADAGASCAR Résumé : Les Lémuriens nocturnes sont parmi les primates menacés par les dangers dus à
la dégradation incessante de l’environnement et des écosystèmes. C’est le cas de Lépilemur
de Milne-Edwards (Lepilemur edwardsi), objet de notre étude, un lémurien nocturne qui a la
taille d’un chat. Le Site d’études est la seule distribution continue de cette espèce qui subsiste
au nord-ouest de Madagascar, le parc National Ankafantsika(PNA) et ses alentours. 9 sites,
répartis dans le PNA ont été choisis plus un 10 ème, Ampijoroa, comme site de référence (sur
les études de comportement seulement), pour réaliser ces études, afin d’éclaircir les
problèmes relatifs à sa distribution , son abondance, son éthologie, sa bioacoustique et surtout
de promouvoir, en sa faveur, une conservation efficace ; Les périodes d’étude s’étendent de
mai à Octobre 2003 et de mai à Octobre 2004 ; Pour la première fois une tentative
d’explication sera entreprise dans ces études sur la distribution et l’abondance de Lepilemur
edwardsi dans le PNA, par la méthode des transects et des recensements nocturnes. La densité
relative de lepilemur edwardsi dans le PNA est relativement faible (O-3 individus/km)par
rapport à Ampijoroa ; La radiotélémétrie a permis d récolter des données comportementales
de 42 individus répartis dans 8 sites, d’enregistrer leur vocalisation et d’établir les contextes
des cris ; Les Analyses morphométriques et bioacoustiques ont monté qu’il n’y a pas de
différence entre les mâles et les femelles dans chaque site ; ce qui a permis de comparer les
sites. Il y a beaucoup de similarités morphométriques eet acoustiques de l’espèce étudiée dans
8 sites du PNA. Il peut en être déduit que Lepilemur edwardsi y forme une seule
métapopulation . Cependant, quelques variables morphométriques semblent être significatives
par l’effet des sites et elles sont dues probablement à des adaptations particulières des
populations à des types d’habitat local. Les contextes des cri ont permis d’évaluer leur
symétrie temporelle entre ceux du matin et ceux du soir. Un statut de conservation de rang
pus élevé est alors proposé pour lepilemur edwardsi du fait de sa densité faible le PNA,
compte tenu de sa reproduction très limitée et des incessantes menaces de perte d’habitat et de
braconnage.En ligne : http://biblio.univ-antananarivo.mg/pdfs/rabesandratanaaz_sn_doc3_06.pdf Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire