24 recherche sur le mot-clé 'LEMURS'   

Activity budgets and activity rhythms in red ruffed lemurs (Varecia rubra) on the Masoala Peninsula, Madagascar: seasonality and reproductive energetics / Vasey, N.  

Public ISBD 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, Densité Mots-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, Densité Mots-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.  

Public ISBD 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, Densité Mots-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, Densité Mots-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

Captive conditions of pet lemurs in Madagascar / Kim Reuter  

Public ISBD Titre : Captive conditions of pet lemurs in Madagascar Type de document : texte imprimé Auteurs : Kim Reuter ; Melissa S. Schaefer Année de publication : 2016 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : LEMURS  MADAGASCAR  AFRICA  PET  TRADE  CAPTURE Résumé : Live extraction of wildlife is a threat to biodiversity and can compromise animal welfare standards. Studies of the captive environments and welfare of pet primates are known, but none has focused on Madagascar. We aimed to expand knowledge about the captive conditions of pet lemurs in Madagascar. We hypothesized that captive lemurs would often be kept in restrictive settings, including small cages, would be fed foods inconsistent with their natural diets and, as a result, would be in bad physical or psychological health. Data were collected via a web-based survey (n = 253 reports) and from the websites and social media pages of 25 hotels. Most lemurs seen by respondents were either kept on a rope/leash/chain or in a cage (67%), though some lemurs were habituated and were not restrained (28%). Most of the time (72%) cages were considered small, and lemurs were rarely kept in captivity together with other lemurs (81% of lemurs were caged alone). Pet lemurs were often fed foods inconsistent with their natural diets, and most (53%) were described as being in bad health. These findings point to a need to undertake outreach to pet lemur owners in Madagascar about the captivity requirements of primates. Titre du périodique : Folia Primatologica Volume : 87:48-63 En ligne : https://doi.org/10.1159/000444582 Captive conditions of pet lemurs in Madagascar [texte imprimé] / Kim Reuter ; Melissa S. Schaefer . - 2016. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : LEMURS  MADAGASCAR  AFRICA  PET  TRADE  CAPTURE Résumé : Live extraction of wildlife is a threat to biodiversity and can compromise animal welfare standards. Studies of the captive environments and welfare of pet primates are known, but none has focused on Madagascar. We aimed to expand knowledge about the captive conditions of pet lemurs in Madagascar. We hypothesized that captive lemurs would often be kept in restrictive settings, including small cages, would be fed foods inconsistent with their natural diets and, as a result, would be in bad physical or psychological health. Data were collected via a web-based survey (n = 253 reports) and from the websites and social media pages of 25 hotels. Most lemurs seen by respondents were either kept on a rope/leash/chain or in a cage (67%), though some lemurs were habituated and were not restrained (28%). Most of the time (72%) cages were considered small, and lemurs were rarely kept in captivity together with other lemurs (81% of lemurs were caged alone). Pet lemurs were often fed foods inconsistent with their natural diets, and most (53%) were described as being in bad health. These findings point to a need to undertake outreach to pet lemur owners in Madagascar about the captivity requirements of primates. Titre du périodique : Folia Primatologica Volume : 87:48-63 En ligne : https://doi.org/10.1159/000444582

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Direct and Indirect Impacts of Raptor Predation on Lemurs in Southeastern Madagascar / Sarah M. Karpanty  

Public ISBD Titre : Direct and Indirect Impacts of Raptor Predation on Lemurs in Southeastern Madagascar Type de document : texte imprimé Auteurs : Sarah M. Karpanty Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CONSERVATION  LEMURS  MADAGASCAR  PREDATION  RAPTORS Résumé : I calculated rates of predation by 2 species of diurnal raptors, Polyboroides radiatus and Accipiter henstii, on the lemur community of Ranomafana National Park, Madagascar from 2700 h of observation and 470 prey deliveries at 7 nests of each hawk species. The 2 hawks consumed 7 of 12 lemurs found in the park region, with a body mass of 63–3500 g and including diurnal and nocturnal species of all group sizes. Calculations of predation rates indicate that raptor predation is a significant cause of mortality for lemur populations relative to other causes. Minimum rates of predation by Polyboroides radiatus and Accipiter henstii on Microcebus rufus, Cheirogaleus major, Avahi laniger, Hapalemur griseus, Eulemur fulvus rufus, Eulemur rubriventer, and Varecia variegata resulted in the raptors removing of 1–21% of the population per yr, similar to other rates of predation on primates documented in the literature. Modeling of lemur populations under varying levels of raptor predation pressure that I calculated found that one may attribute 3–17% of adult, juvenile, and infant mortality for nocturnal lemurs and 2–66% of adult, juvenile, and infant mortality for diurnal lemurs to diurnal raptor predation. Raptor predation may significantly depress intrinsic growth rates and carrying capacity of Avahi laniger, Hapalemur griseus, Eulemur fulvus rufus, Eulemur rubriventer, and Varecia variegata owing to their low fecundities, long life spans, and long age to sexual maturation. Nocturnal lemurs may best avoid predation by diurnal raptors by exhibiting a solitary lifestyle and cryptic antipredator tactics, whereas, diurnal lemurs benefit less by increasing group size than by using specific antipredator tactics Titre du périodique : International Journal of Primatology Volume : 27( 239-261) En ligne : https://doi.org/10.1007/s10764-005-9008-x Direct and Indirect Impacts of Raptor Predation on Lemurs in Southeastern Madagascar [texte imprimé] / Sarah M. Karpanty . - 2006. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CONSERVATION  LEMURS  MADAGASCAR  PREDATION  RAPTORS Résumé : I calculated rates of predation by 2 species of diurnal raptors, Polyboroides radiatus and Accipiter henstii, on the lemur community of Ranomafana National Park, Madagascar from 2700 h of observation and 470 prey deliveries at 7 nests of each hawk species. The 2 hawks consumed 7 of 12 lemurs found in the park region, with a body mass of 63–3500 g and including diurnal and nocturnal species of all group sizes. Calculations of predation rates indicate that raptor predation is a significant cause of mortality for lemur populations relative to other causes. Minimum rates of predation by Polyboroides radiatus and Accipiter henstii on Microcebus rufus, Cheirogaleus major, Avahi laniger, Hapalemur griseus, Eulemur fulvus rufus, Eulemur rubriventer, and Varecia variegata resulted in the raptors removing of 1–21% of the population per yr, similar to other rates of predation on primates documented in the literature. Modeling of lemur populations under varying levels of raptor predation pressure that I calculated found that one may attribute 3–17% of adult, juvenile, and infant mortality for nocturnal lemurs and 2–66% of adult, juvenile, and infant mortality for diurnal lemurs to diurnal raptor predation. Raptor predation may significantly depress intrinsic growth rates and carrying capacity of Avahi laniger, Hapalemur griseus, Eulemur fulvus rufus, Eulemur rubriventer, and Varecia variegata owing to their low fecundities, long life spans, and long age to sexual maturation. Nocturnal lemurs may best avoid predation by diurnal raptors by exhibiting a solitary lifestyle and cryptic antipredator tactics, whereas, diurnal lemurs benefit less by increasing group size than by using specific antipredator tactics Titre du périodique : International Journal of Primatology Volume : 27( 239-261) En ligne : https://doi.org/10.1007/s10764-005-9008-x

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Habitat use by the island lemurs of Nosy Be, Madagascar / Jen Tinsman  

Public ISBD Titre : Habitat use by the island lemurs of Nosy Be, Madagascar Type de document : texte imprimé Auteurs : Jen Tinsman, Auteur ; Maria S. N. Volampeno, Auteur ; Jessica Ganas-Swaray, Auteur ; Daniel Gann, Auteur ; Natacha Andrianirina, Auteur ; Madison Chamizo, Auteur ; Claude Ralazampirenena, Auteur ; Jean F. Ranaivoarisoa, Auteur ; Hasina Ravaoarisoa, Auteur ; Josie Rivero, Auteur ; Andrew Zamora, Auteur ; Cristina M. Gomes, Auteur Année de publication : 2022 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : HABITAT USE  ISLAND POPULATIONS,  LEMURS  MULTI-SPECIES OCCUPANCY MODELING Résumé : Madagascar's lemurs are threatened by forest loss, fragmentation, and degradation. Many species use flexible behaviors to survive in degraded habitat, but their ability to persist in very small areas may be limited. Insular lemurs, like those found on Nosy Be, an island off the northwestern coast of Madagascar, are at heightened risk of sudden population declines and extirpation. Nosy Be is home to two Critically Endangered species—the endemic Nosy Be sportive lemur (Lepilemur tymerlachsoni) and Claire's mouse lemur (Microcebus mamiratra)—as well as the Endangered black lemur (Eulemur macaco). Most of the remaining forest on Nosy Be is protected by the 862-ha Lokobe National Park. To document how Nosy Be lemurs use their restricted habitat, we conducted vegetation and reconnaissance surveys on 53 transects in and around Lokobe. We collected data on tree size, canopy cover, understory visibility, and elevation for 248 lemur sightings. We used a spatially explicit, multi-species occupancy model to investigate which forest-structure variables are important to lemurs. Our results represent some of the first data on habitat use by insular lemurs. Black lemurs preferred significantly larger trees and areas with less dense understory. They also occurred significantly less outside of Lokobe National Park, even when accounting for sampling effort and geography. The distributions of the sportive and mouse lemurs were not related to the forest structure variables we documented, but they did negatively predict each other—perhaps because their habitat requirements differ. These results also underscore the importance of the national park to protecting the black lemur population on Nosy Be and raise questions about what factors do influence the distribution of Nosy Be's smaller lemurs. Close monitoring is needed to prevent these populations and the ecosystem services they provide from disappearing, as have other island lemurs. Titre du périodique : American Journal of Primatology Volume : 84(3) En ligne : https://doi.org/10.1002/ajp.23362 Habitat use by the island lemurs of Nosy Be, Madagascar [texte imprimé] / Jen Tinsman, Auteur ; Maria S. N. Volampeno, Auteur ; Jessica Ganas-Swaray, Auteur ; Daniel Gann, Auteur ; Natacha Andrianirina, Auteur ; Madison Chamizo, Auteur ; Claude Ralazampirenena, Auteur ; Jean F. Ranaivoarisoa, Auteur ; Hasina Ravaoarisoa, Auteur ; Josie Rivero, Auteur ; Andrew Zamora, Auteur ; Cristina M. Gomes, Auteur . - 2022. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : HABITAT USE  ISLAND POPULATIONS,  LEMURS  MULTI-SPECIES OCCUPANCY MODELING Résumé : Madagascar's lemurs are threatened by forest loss, fragmentation, and degradation. Many species use flexible behaviors to survive in degraded habitat, but their ability to persist in very small areas may be limited. Insular lemurs, like those found on Nosy Be, an island off the northwestern coast of Madagascar, are at heightened risk of sudden population declines and extirpation. Nosy Be is home to two Critically Endangered species—the endemic Nosy Be sportive lemur (Lepilemur tymerlachsoni) and Claire's mouse lemur (Microcebus mamiratra)—as well as the Endangered black lemur (Eulemur macaco). Most of the remaining forest on Nosy Be is protected by the 862-ha Lokobe National Park. To document how Nosy Be lemurs use their restricted habitat, we conducted vegetation and reconnaissance surveys on 53 transects in and around Lokobe. We collected data on tree size, canopy cover, understory visibility, and elevation for 248 lemur sightings. We used a spatially explicit, multi-species occupancy model to investigate which forest-structure variables are important to lemurs. Our results represent some of the first data on habitat use by insular lemurs. Black lemurs preferred significantly larger trees and areas with less dense understory. They also occurred significantly less outside of Lokobe National Park, even when accounting for sampling effort and geography. The distributions of the sportive and mouse lemurs were not related to the forest structure variables we documented, but they did negatively predict each other—perhaps because their habitat requirements differ. These results also underscore the importance of the national park to protecting the black lemur population on Nosy Be and raise questions about what factors do influence the distribution of Nosy Be's smaller lemurs. Close monitoring is needed to prevent these populations and the ecosystem services they provide from disappearing, as have other island lemurs. Titre du périodique : American Journal of Primatology Volume : 84(3) En ligne : https://doi.org/10.1002/ajp.23362

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Methodological considerations in reserve system selection: A case study of Malagasy lemurs / Kathryn Fiorella  

Public ISBD Titre : Methodological considerations in reserve system selection: A case study of Malagasy lemurs Type de document : texte imprimé Auteurs : Kathryn Fiorella, Auteur ; Alison Cameron, Auteur ; Wes Sechrest, Auteur ; Rachael Winfree, Auteur ; Claire Kremen, Auteur Année de publication : 2010 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : CONSERVATION PLANNING  RED LIST INDEX  LEMURS  MADAGASCAR  SPECIES WEIGHTS  ZONATION Résumé : Although data quality and weighting decisions impact the outputs of reserve selection algorithms, these factors have not been closely studied. We examine these methodological issues in the use of reserve selection algorithms by comparing: (1) quality of input data and (2) use of different weighting methods for prioritizing among species. In 2003, the government of Madagascar, a global biodiversity hotspot, committed to tripling the size of its protected area network to protect 10% of the country’s total land area. We apply the Zonation reserve selection algorithm to distribution data for 52 lemur species to identify priority areas for the expansion of Madagascar’s reserve network. We assess the similarity of the areas selected, as well as the proportions of lemur ranges protected in the resulting areas when different forms of input data were used: extent of occurrence versus refined extent of occurrence. Low overlap between the areas selected suggests that refined extent of occurrence data are highly desirable, and to best protect lemur species, we recommend refining extent of occurrence ranges using habitat and altitude limitations. Reserve areas were also selected for protection based on three different species weighting schemes, resulting in marked variation in proportional representation of species among the IUCN Red List of Threatened Species extinction risk categories. This result demonstrates that assignment of species weights influences whether a reserve network prioritizes maximizing overall species protection or maximizing protection of the most threatened species. Titre du périodique : Biological Conservation Volume : 143 (4):963-973 En ligne : https://doi.org/10.1016/j.biocon.2010.01.005 Methodological considerations in reserve system selection: A case study of Malagasy lemurs [texte imprimé] / Kathryn Fiorella, Auteur ; Alison Cameron, Auteur ; Wes Sechrest, Auteur ; Rachael Winfree, Auteur ; Claire Kremen, Auteur . - 2010. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : CONSERVATION PLANNING  RED LIST INDEX  LEMURS  MADAGASCAR  SPECIES WEIGHTS  ZONATION Résumé : Although data quality and weighting decisions impact the outputs of reserve selection algorithms, these factors have not been closely studied. We examine these methodological issues in the use of reserve selection algorithms by comparing: (1) quality of input data and (2) use of different weighting methods for prioritizing among species. In 2003, the government of Madagascar, a global biodiversity hotspot, committed to tripling the size of its protected area network to protect 10% of the country’s total land area. We apply the Zonation reserve selection algorithm to distribution data for 52 lemur species to identify priority areas for the expansion of Madagascar’s reserve network. We assess the similarity of the areas selected, as well as the proportions of lemur ranges protected in the resulting areas when different forms of input data were used: extent of occurrence versus refined extent of occurrence. Low overlap between the areas selected suggests that refined extent of occurrence data are highly desirable, and to best protect lemur species, we recommend refining extent of occurrence ranges using habitat and altitude limitations. Reserve areas were also selected for protection based on three different species weighting schemes, resulting in marked variation in proportional representation of species among the IUCN Red List of Threatened Species extinction risk categories. This result demonstrates that assignment of species weights influences whether a reserve network prioritizes maximizing overall species protection or maximizing protection of the most threatened species. Titre du périodique : Biological Conservation Volume : 143 (4):963-973 En ligne : https://doi.org/10.1016/j.biocon.2010.01.005

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Origins, Diversity and Relationships of Lemurs / Robert D. Martin  

Public ISBD Titre : Origins, Diversity and Relationships of Lemurs Type de document : texte imprimé Auteurs : Robert D. Martin Année de publication : 2000 Langues : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Génétique, Parasite, Maladie Mots-clés : LEMURS  NEW SPECIES  TIME OF ORIGIN  MOLECULAR PHYLOGENY  CONTNENTAL DRIFT  ADAPTIVE RADIATION  DNA SEQUENCES Résumé : I review new evidence on origins and adaptive radiation of Malagasy lemurs, a remarkably diverse group containing 13% of living primate species. The number of recognized lemur species has increased significantly, partly due to research revealing specific subdivisions within known populations but mainly because of discovery of new populations through fieldwork. Some species feared to be extinct have also been rediscovered. Specific numbers have increased particularly in small-bodied, cryptic genera for which continued research will surely reveal even more species. Adaptative radiation of lemurs has been essentially confined to Madagascar. The high density of lemur species on that island, associated with very small geographical ranges, has major implications both for their evolutionary divergence and for conservation. Reconstructions of phylogenetic relationships among primates have been considerably enhanced by DNA sequence data. Sufficient data are now available from both nuclear and mitochondrial sequences to examine relationships among and within the major groups of living primates. Most studies have confirmed that lemurs constitute a monophyletic sister-group of the lorisiform clade and all exclude a specific relationship between cheirogaleids and lorisiforms repeatedly inferred from morphological evidence. However, some analyses indicate that the aye-aye may have branched away before the divergence between other lemurs and lorisiforms. DNA sequence analyses have also yielded a broad consensus for relationships between Eulemur, Hapalemur, Lemur and Varecia: Varecia branched away first, while Lemur is more closely related to Hapalemur than to Eulemur. As debate about phylogenetic relationships among lemurs and other primates seems to have been settled in favor of lemur monophyly (possibly excluding the aye-aye), only a single invasion of Madagascar is required; but it must still be explained how ancestral lemurs could have migrated there at an appropriate time. Separation between Madagascar and Africa was apparently complete by about 120 Ma, too far in the past for direct overland migration. A recent hypothesis suggested that uplifted land in the Mozambique Channel assisted colonization of Madagascar 26-45 Ma, seemingly agreeing with an estimated date of about 40 Ma for divergence of lemurs from other primates. However, mounting evidence suggests that divergence occurred significantly earlier. Because the earliest known fossil representatives of several modern orders of placental mammals (including primates) are dated no earlier than the early Tertiary, it is widely accepted that their divergence took place after the Cretaceous/Tertiary mass extinction. Yet the known fossil record can only yield minimum divergence times; if sampling is poor and/or biased there may be a considerable discrepancy between minimum and actual dates. There is, for example, virtually no known fossil record for lemurs in Madagascar and the earliest known representatives are subfossil lemurs, so in this case a direct reading of the fossil record would indicate that the lemurs first originated just a few thousand years ago! Examination of underestimation of times of origin because of poor sampling in the fossil record has confirmed previous suggestions that primates originated considerably earlier than generally believed. Several recent phylogenetic reconstructions based on DNA sequence data and using calibration dates derived from groups other than primates provide independent support for this inference. Overall, it now seems that primates originated at around 90 Ma rather than the 55 Ma indicated by direct reading of the known fossil record. Hence, colonization of Madagascar by lemurs would have taken place at about 80 Ma, double the date usually accepted, and should be interpreted in terms of contemporary continental relationships. En ligne : https://doi.org/10.1023/A:1005563113546 Origins, Diversity and Relationships of Lemurs [texte imprimé] / Robert D. Martin . - 2000. Langues : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Génétique, Parasite, Maladie Mots-clés : LEMURS  NEW SPECIES  TIME OF ORIGIN  MOLECULAR PHYLOGENY  CONTNENTAL DRIFT  ADAPTIVE RADIATION  DNA SEQUENCES Résumé : I review new evidence on origins and adaptive radiation of Malagasy lemurs, a remarkably diverse group containing 13% of living primate species. The number of recognized lemur species has increased significantly, partly due to research revealing specific subdivisions within known populations but mainly because of discovery of new populations through fieldwork. Some species feared to be extinct have also been rediscovered. Specific numbers have increased particularly in small-bodied, cryptic genera for which continued research will surely reveal even more species. Adaptative radiation of lemurs has been essentially confined to Madagascar. The high density of lemur species on that island, associated with very small geographical ranges, has major implications both for their evolutionary divergence and for conservation. Reconstructions of phylogenetic relationships among primates have been considerably enhanced by DNA sequence data. Sufficient data are now available from both nuclear and mitochondrial sequences to examine relationships among and within the major groups of living primates. Most studies have confirmed that lemurs constitute a monophyletic sister-group of the lorisiform clade and all exclude a specific relationship between cheirogaleids and lorisiforms repeatedly inferred from morphological evidence. However, some analyses indicate that the aye-aye may have branched away before the divergence between other lemurs and lorisiforms. DNA sequence analyses have also yielded a broad consensus for relationships between Eulemur, Hapalemur, Lemur and Varecia: Varecia branched away first, while Lemur is more closely related to Hapalemur than to Eulemur. As debate about phylogenetic relationships among lemurs and other primates seems to have been settled in favor of lemur monophyly (possibly excluding the aye-aye), only a single invasion of Madagascar is required; but it must still be explained how ancestral lemurs could have migrated there at an appropriate time. Separation between Madagascar and Africa was apparently complete by about 120 Ma, too far in the past for direct overland migration. A recent hypothesis suggested that uplifted land in the Mozambique Channel assisted colonization of Madagascar 26-45 Ma, seemingly agreeing with an estimated date of about 40 Ma for divergence of lemurs from other primates. However, mounting evidence suggests that divergence occurred significantly earlier. Because the earliest known fossil representatives of several modern orders of placental mammals (including primates) are dated no earlier than the early Tertiary, it is widely accepted that their divergence took place after the Cretaceous/Tertiary mass extinction. Yet the known fossil record can only yield minimum divergence times; if sampling is poor and/or biased there may be a considerable discrepancy between minimum and actual dates. There is, for example, virtually no known fossil record for lemurs in Madagascar and the earliest known representatives are subfossil lemurs, so in this case a direct reading of the fossil record would indicate that the lemurs first originated just a few thousand years ago! Examination of underestimation of times of origin because of poor sampling in the fossil record has confirmed previous suggestions that primates originated considerably earlier than generally believed. Several recent phylogenetic reconstructions based on DNA sequence data and using calibration dates derived from groups other than primates provide independent support for this inference. Overall, it now seems that primates originated at around 90 Ma rather than the 55 Ma indicated by direct reading of the known fossil record. Hence, colonization of Madagascar by lemurs would have taken place at about 80 Ma, double the date usually accepted, and should be interpreted in terms of contemporary continental relationships. En ligne : https://doi.org/10.1023/A:1005563113546

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

The state of lemur conservation in south-eastern Madagascar: population and habitat assessments for diurnal and cathemeral lemurs using surveys, satellite imagery and GIS / M.T. Irwin  

Public ISBD Titre : The state of lemur conservation in south-eastern Madagascar: population and habitat assessments for diurnal and cathemeral lemurs using surveys, satellite imagery and GIS Type de document : texte imprimé Auteurs : M.T. Irwin, Auteur ; Steig E. Johnson, Auteur ; Patricia C. Wright, Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : CONSERVATION STATUS  GEOGRAPHIC RANGE  GIS  LEMURS  MADAGASCAR  POPULATION DENSITIES  PRIMATES Résumé : The unique primates of south-eastern Madagascar face threats from growing human populations. The country's extant primates already represent only a subset of the taxonomic and ecological diversity existing a few thousand years ago. To prevent further losses remaining taxa must be subjected to effective monitoring programmes that directly inform conservation efforts. We offer a necessary first step: revision of geographic ranges and quantification of habitat area and population size for diurnal and cathemeral (active during both day and night) lemurs. Recent satellite images are used to develop a forest cover geographical information system, and censuses are used to establish range boundaries and develop estimates of population density and size. These assessments are used to identify regions and taxa at risk, and will be a useful baseline for future monitoring of habitat and populations. Precise estimates are impossible for patchily-distributed taxa (especially Hapalemur aureus, H. simus and Varecia variegata variegata); these taxa require more sophisticated modelling. Titre du périodique : Oryx Volume : 39(2): 204-218 En ligne : https://doi.org/10.1017/S0030605305000451 The state of lemur conservation in south-eastern Madagascar: population and habitat assessments for diurnal and cathemeral lemurs using surveys, satellite imagery and GIS [texte imprimé] / M.T. Irwin, Auteur ; Steig E. Johnson, Auteur ; Patricia C. Wright, Auteur . - 2005. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : CONSERVATION STATUS  GEOGRAPHIC RANGE  GIS  LEMURS  MADAGASCAR  POPULATION DENSITIES  PRIMATES Résumé : The unique primates of south-eastern Madagascar face threats from growing human populations. The country's extant primates already represent only a subset of the taxonomic and ecological diversity existing a few thousand years ago. To prevent further losses remaining taxa must be subjected to effective monitoring programmes that directly inform conservation efforts. We offer a necessary first step: revision of geographic ranges and quantification of habitat area and population size for diurnal and cathemeral (active during both day and night) lemurs. Recent satellite images are used to develop a forest cover geographical information system, and censuses are used to establish range boundaries and develop estimates of population density and size. These assessments are used to identify regions and taxa at risk, and will be a useful baseline for future monitoring of habitat and populations. Precise estimates are impossible for patchily-distributed taxa (especially Hapalemur aureus, H. simus and Varecia variegata variegata); these taxa require more sophisticated modelling. Titre du périodique : Oryx Volume : 39(2): 204-218 En ligne : https://doi.org/10.1017/S0030605305000451

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Who hunts lemurs and why they hunt them / Cortini Borgerson ; Margaret A. McKean ; Michael R. Sutherland ; Laurie R. Godfrey  

Public ISBD Titre : Who hunts lemurs and why they hunt them Type de document : texte imprimé Auteurs : Cortini Borgerson, Auteur ; Margaret A. McKean, Auteur ; Michael R. Sutherland, Auteur ; Laurie R. Godfrey, Auteur Année de publication : 2016 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : BUSHMEAT  LEMURS  CONSERVATION  HUNTING  HUMAN HEALTH  CHILD  MALNUTRITION  POVERTY  MASOALA  MADAGASCAR Résumé : The main threats to lemurs are habitat loss and hunting. Conservation policies often assume that people will decrease lemur hunting if they understand government prohibitions on hunting, are educated and/or involved in ecotourism, have access to affordable meat, and/or are healthy and financially secure. Yet these assumptions are often not well tested where conservation policies are implemented. We interviewed every member of a focal village in one of the most biodiverse places on earth, the Masoala peninsula of Madagascar. The factors that best predicted the decision to hunt lemurs were poverty, poor health, and child malnutrition. Knowledge of laws, level of education, involvement in ecotourism, traditional cultural values, taste preferences, opportunity, and human–wildlife conflict had no impact on lemur hunting. Our results suggest that the welfare of humans and lemurs are linked. The key to discouraging illegal hunting and improving the viability of Endangered lemur populations may be improving rural human health and welfare. Titre du périodique : Biological Conservation Volume : 197 : 124-130 En ligne : https://doi.org/10.1016/j.biocon.2016.02.012 Who hunts lemurs and why they hunt them [texte imprimé] / Cortini Borgerson, Auteur ; Margaret A. McKean, Auteur ; Michael R. Sutherland, Auteur ; Laurie R. Godfrey, Auteur . - 2016. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : BUSHMEAT  LEMURS  CONSERVATION  HUNTING  HUMAN HEALTH  CHILD  MALNUTRITION  POVERTY  MASOALA  MADAGASCAR Résumé : The main threats to lemurs are habitat loss and hunting. Conservation policies often assume that people will decrease lemur hunting if they understand government prohibitions on hunting, are educated and/or involved in ecotourism, have access to affordable meat, and/or are healthy and financially secure. Yet these assumptions are often not well tested where conservation policies are implemented. We interviewed every member of a focal village in one of the most biodiverse places on earth, the Masoala peninsula of Madagascar. The factors that best predicted the decision to hunt lemurs were poverty, poor health, and child malnutrition. Knowledge of laws, level of education, involvement in ecotourism, traditional cultural values, taste preferences, opportunity, and human–wildlife conflict had no impact on lemur hunting. Our results suggest that the welfare of humans and lemurs are linked. The key to discouraging illegal hunting and improving the viability of Endangered lemur populations may be improving rural human health and welfare. Titre du périodique : Biological Conservation Volume : 197 : 124-130 En ligne : https://doi.org/10.1016/j.biocon.2016.02.012

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Lemur diversity : a recent efflorescence of species / Rylands, Anthony B.

Public ISBD Titre : Lemur diversity : a recent efflorescence of species : *** Auteurs : Rylands, Anthony B. , Editeur : Année de publication : 2007 Importance : p. 12-17 Format : 30 cm ISBN/ISSN/EAN : 1608-1439 Note générale : TAXONOMIE ANIMALE Catégories : SCIENCES DE LA VIE Mots-clés : MADAGASIKARA  LEMURS  DIVERSITE  ESPECES Résumé : Une re-évaluation récente de la diversité de Lémurs a inscrit 93 taxons dont 90 sont considérés des espèces. Les trois autres sont des formes sous spécifiques. Les nombres de taxon de lémur ont augmenté en raison des révisions taxonomiques qui ont ressuscité des formes synonymes récentes précédemment considérées et parce que des études morphologiques et surtout génétiques ont mis en lumière des populations considérées suffisamment distinctes pour justifier leur classification comme 'nouvelle' espèce séparée. La deuxième force agissante derrière la prolifération de taxons de lémur est la découverte 'de nouvelle' espèce. Dans la grande majorité des cas, celles-ci ont été identifiées par la génétique moléculaire et la cytogénétique. Trente-trois (33) nouveaux taxons ont été décrits juste entre 2000 et 2006, dont 24 étaient en 2006. La montée de nouvelles espèces et la documentation de ce qui est apparemment une bien plus grande diversité de lémurs auparavant reconnue est extraordinaire. Pourtant, il soutient en même temps les questions antérieures importantes concernant les méthodes et normes dans le catalogage de la vie autour de nous. Le binôme latin est aujourd'hui affecté d'une signification dans la compréhension évolutionniste (le temps) et les processus (l'espace) biogéographiques, qui placent une responsabilité sur ceux qui décrivent la nouvelle espèce d'un poids qui est parfois reconnu ou non. La perte rapide de biodiversité donne une urgence sans précédent pour décrire et le document des espèces qui est la génétique moléculaire, particulièrement, fournit les moyens d'entreprendre cet effort avec une vitesse jamais possible auparavant. Le travail continue sur des échantillons de sang de population de lémur partout dans Madagascar et beaucoup plus de descriptions des espèces apparaîtront dans le proche avenir.- - - Note de contenu : - - - - - - Numéro du document : 08B Niveau Bibliographique : 3 Bull1 (Theme principale) : TAXONOMIE ANIMALE Lemur diversity : a recent efflorescence of species : *** [] / Rylands, Anthony B. ,  . - , 2007 . - p. 12-17 ; 30 cm. ISSN : 1608-1439 TAXONOMIE ANIMALE Catégories : SCIENCES DE LA VIE Mots-clés : MADAGASIKARA  LEMURS  DIVERSITE  ESPECES Résumé : Une re-évaluation récente de la diversité de Lémurs a inscrit 93 taxons dont 90 sont considérés des espèces. Les trois autres sont des formes sous spécifiques. Les nombres de taxon de lémur ont augmenté en raison des révisions taxonomiques qui ont ressuscité des formes synonymes récentes précédemment considérées et parce que des études morphologiques et surtout génétiques ont mis en lumière des populations considérées suffisamment distinctes pour justifier leur classification comme 'nouvelle' espèce séparée. La deuxième force agissante derrière la prolifération de taxons de lémur est la découverte 'de nouvelle' espèce. Dans la grande majorité des cas, celles-ci ont été identifiées par la génétique moléculaire et la cytogénétique. Trente-trois (33) nouveaux taxons ont été décrits juste entre 2000 et 2006, dont 24 étaient en 2006. La montée de nouvelles espèces et la documentation de ce qui est apparemment une bien plus grande diversité de lémurs auparavant reconnue est extraordinaire. Pourtant, il soutient en même temps les questions antérieures importantes concernant les méthodes et normes dans le catalogage de la vie autour de nous. Le binôme latin est aujourd'hui affecté d'une signification dans la compréhension évolutionniste (le temps) et les processus (l'espace) biogéographiques, qui placent une responsabilité sur ceux qui décrivent la nouvelle espèce d'un poids qui est parfois reconnu ou non. La perte rapide de biodiversité donne une urgence sans précédent pour décrire et le document des espèces qui est la génétique moléculaire, particulièrement, fournit les moyens d'entreprendre cet effort avec une vitesse jamais possible auparavant. Le travail continue sur des échantillons de sang de population de lémur partout dans Madagascar et beaucoup plus de descriptions des espèces apparaîtront dans le proche avenir.- - - Note de contenu : - - - - - - Numéro du document : 08B Niveau Bibliographique : 3 Bull1 (Theme principale) : TAXONOMIE ANIMALE

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Origine
38586		Livre	CIDST	Bibliotheque DDI	Exclu du prêt

Conservation education in Madagascar: three case studies in the biologically diverse island-continent / Francine L. Dollins  

Public ISBD Titre : Conservation education in Madagascar: three case studies in the biologically diverse island-continent Type de document : texte imprimé Auteurs : Francine L. Dollins, Auteur ; Alison Jolly, Auteur ; Hantanirina Rasamimanana, Auteur ; Jonah Ratsimbazafy, Auteur ; Anna T.C. Feistner, Auteur ; Florent Ravoavy, Auteur Année de publication : 2010 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : MADAGASCAR  CONSERVATION  EDUCATION  COMMUNITY  ENDEMIC SPECIES  LEMURS Résumé : Few Malagasy children and adults are aware of the rare and unique fauna and flora indigenous to their island-continent, including flagship lemur species. Even the Malagasy ancestral proverbs never mentioned lemurs, but these same proverbs talked about the now extinct hippopotamus. Madagascar's geography, history, and economic constraints contribute to severe biodiversity loss. Deforestation on Madagascar is reported to be over 100,000 ha/year, with only 10–15% of the island retaining natural forest [Green & Sussman, 1990]. Educating children, teacher-training, and community projects about environmental and conservation efforts to protect the remaining natural habitats of endangered lemur species provide a basis for long-term changes in attitudes and practices. Case studies of three conservation education projects located in different geographical regions of Madagascar, Centre ValBio, Madagacar Wildlife Conservation Alaotra Comic Book Project, and The Ako Book Project, are presented together with their ongoing stages of development, assessment, and outcomes. We argue that while nongovernmental organizational efforts are and will be very important, the Ministry of Education urgently needs to incorporate biodiversity education in the curriculum at all levels, from primary school to university Titre du périodique : American Journal of Primatology Volume : 72: 391-496 En ligne : https://doi.org/10.1002/ajp.20779 Conservation education in Madagascar: three case studies in the biologically diverse island-continent [texte imprimé] / Francine L. Dollins, Auteur ; Alison Jolly, Auteur ; Hantanirina Rasamimanana, Auteur ; Jonah Ratsimbazafy, Auteur ; Anna T.C. Feistner, Auteur ; Florent Ravoavy, Auteur . - 2010. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : MADAGASCAR  CONSERVATION  EDUCATION  COMMUNITY  ENDEMIC SPECIES  LEMURS Résumé : Few Malagasy children and adults are aware of the rare and unique fauna and flora indigenous to their island-continent, including flagship lemur species. Even the Malagasy ancestral proverbs never mentioned lemurs, but these same proverbs talked about the now extinct hippopotamus. Madagascar's geography, history, and economic constraints contribute to severe biodiversity loss. Deforestation on Madagascar is reported to be over 100,000 ha/year, with only 10–15% of the island retaining natural forest [Green & Sussman, 1990]. Educating children, teacher-training, and community projects about environmental and conservation efforts to protect the remaining natural habitats of endangered lemur species provide a basis for long-term changes in attitudes and practices. Case studies of three conservation education projects located in different geographical regions of Madagascar, Centre ValBio, Madagacar Wildlife Conservation Alaotra Comic Book Project, and The Ako Book Project, are presented together with their ongoing stages of development, assessment, and outcomes. We argue that while nongovernmental organizational efforts are and will be very important, the Ministry of Education urgently needs to incorporate biodiversity education in the curriculum at all levels, from primary school to university Titre du périodique : American Journal of Primatology Volume : 72: 391-496 En ligne : https://doi.org/10.1002/ajp.20779

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  

Public ISBD 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, Densité Mots-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, Densité Mots-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

Diets of Two Lemur Species in Different Microhabitats in Beza Mahafaly Special Reserve, Madagascar / Nayuta Yamashita  

Public ISBD 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, Densité Mots-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, Densité Mots-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

Evaluating effects of deforestation, hunting, and El Niño events on a threatened lemur / Amy E. Dunham ; Elizabeth M. Erhart ; Deborah J. Overdorff ; Patricia C. Wright  

Public ISBD Titre : Evaluating effects of deforestation, hunting, and El Niño events on a threatened lemur Type de document : texte imprimé Auteurs : Amy E. Dunham, Auteur ; Elizabeth M. Erhart, Auteur ; Deborah J. Overdorff, Auteur ; Patricia C. Wright, Auteur Année de publication : 2008 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : DEMOGRAPHY  EL NINO  ENDANGERED SPECIES  EXTINCTION RISKS  MANAGEMENT  POPULATION MODELS  POPULATION VIABILITY ANALYSIS  PROPITHECUS ADWARDSI  LEMURS  MADAGASCAR Résumé : Madagascar ranks as one of the world’s top extinction hotspots because of its high endemism and high rate of habitat degradation. Global climate phenomena such as El Niño Southern Oscillations may have confounding impacts on the island’s threatened biota but these effects are less well known. We performed a demographic study of Propithecus edwardsi, a lemur inhabiting the eastern rainforest of Madagascar, to evaluate the impact of deforestation, hunting, and El Niño on its population and to re-evaluate present endangerment categorization under the IUCN. Over 18 years of demographic data, including survival and fecundity rates were used to parameterize a stochastic population model structured with three stage classes (yearlings, juveniles, and adults). Results demonstrate that hunting and deforestation are the most significant threats to the population. Analysis of several plausible scenarios and combinations of threat revealed that a 50% population decline within three generations was very likely, supporting current IUCN classification. However, the analysis also suggested that changing global cycles may pose further threat. The average fecundity of lemurs was over 65% lower during El Niño years. While not as severe as deforestation or hunting, if El Niño events remain at the current high frequency there may be negative consequences for the population. We suggest that it is most critical for this species continued survival to create more protected areas, not only to thwart hunting and deforestation, but also to give this endangered lemur a better chance to recover from and adapt to altered climate cycles in the future. Titre du périodique : Biological Conservation Volume : 14(1): 287-297 En ligne : https://doi.org/10.1016/j.biocon.2007.10.006 Evaluating effects of deforestation, hunting, and El Niño events on a threatened lemur [texte imprimé] / Amy E. Dunham, Auteur ; Elizabeth M. Erhart, Auteur ; Deborah J. Overdorff, Auteur ; Patricia C. Wright, Auteur . - 2008. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : DEMOGRAPHY  EL NINO  ENDANGERED SPECIES  EXTINCTION RISKS  MANAGEMENT  POPULATION MODELS  POPULATION VIABILITY ANALYSIS  PROPITHECUS ADWARDSI  LEMURS  MADAGASCAR Résumé : Madagascar ranks as one of the world’s top extinction hotspots because of its high endemism and high rate of habitat degradation. Global climate phenomena such as El Niño Southern Oscillations may have confounding impacts on the island’s threatened biota but these effects are less well known. We performed a demographic study of Propithecus edwardsi, a lemur inhabiting the eastern rainforest of Madagascar, to evaluate the impact of deforestation, hunting, and El Niño on its population and to re-evaluate present endangerment categorization under the IUCN. Over 18 years of demographic data, including survival and fecundity rates were used to parameterize a stochastic population model structured with three stage classes (yearlings, juveniles, and adults). Results demonstrate that hunting and deforestation are the most significant threats to the population. Analysis of several plausible scenarios and combinations of threat revealed that a 50% population decline within three generations was very likely, supporting current IUCN classification. However, the analysis also suggested that changing global cycles may pose further threat. The average fecundity of lemurs was over 65% lower during El Niño years. While not as severe as deforestation or hunting, if El Niño events remain at the current high frequency there may be negative consequences for the population. We suggest that it is most critical for this species continued survival to create more protected areas, not only to thwart hunting and deforestation, but also to give this endangered lemur a better chance to recover from and adapt to altered climate cycles in the future. Titre du périodique : Biological Conservation Volume : 14(1): 287-297 En ligne : https://doi.org/10.1016/j.biocon.2007.10.006

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Habitat Characteristics and Lemur Species Richness in Madagascar / J. U. Ganzhorn  

Public ISBD Titre : Habitat Characteristics and Lemur Species Richness in Madagascar Type de document : texte imprimé Auteurs : J. U. Ganzhorn, Auteur ; S. Malcomber, Auteur ; O. Andrianantoanina, Auteur ; Goodman, Steven M., Auteur Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : COMMUNITY ECOLOGY  DISTURBANCE  FLORISTIC  DIVERSITY  LEMURS  MADAGASCAR  STRUCTURAL DIVERSITY Résumé : In the extant lemur communities of Madagascar the number of lemur species increases with increasing number of tree species. In forests with few tree species lemurs use patches with higher number of tree species than average. However, in forest plots with high number of tree species, lemurs stay in places with lower number of tree species than average. At low tree species diversity a minimum number of different tree species seems to be required within the animals' home range to assure year-round food availability. At high tree species diversity tree species essential for survival might be diluted by resources which are of no use for lemurs, thus increasing energetic expenses for traveling between suitable patches. According to the present analyses, structural diversity is of subordinate importance to the number of tree species as a correlate of lemur species richness. Within limits of disturbance intensity and on a small geographic scale, disturbances increase forest productivity. Lemurs reach higher species numbers and population densities in slightly disturbed areas compared with undisturbed sites. This peaked curve of the number of lemur species over disturbance, however, may not only be a consequence of “resource dilution” in undisturbed sites and higher food abundance in slightly disturbed areas, but also a consequence of selective extinction of lemur species which were unable to cope with the disturbance regime exaggerated by human interference over the last few hundred or thousand years. Titre du périodique : Biotropica Volume : 29 (3): 331-343 En ligne : https://doi.org/10.1111/j.1744-7429.1997.tb00434.x Habitat Characteristics and Lemur Species Richness in Madagascar [texte imprimé] / J. U. Ganzhorn, Auteur ; S. Malcomber, Auteur ; O. Andrianantoanina, Auteur ; Goodman, Steven M., Auteur . - 2006. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : COMMUNITY ECOLOGY  DISTURBANCE  FLORISTIC  DIVERSITY  LEMURS  MADAGASCAR  STRUCTURAL DIVERSITY Résumé : In the extant lemur communities of Madagascar the number of lemur species increases with increasing number of tree species. In forests with few tree species lemurs use patches with higher number of tree species than average. However, in forest plots with high number of tree species, lemurs stay in places with lower number of tree species than average. At low tree species diversity a minimum number of different tree species seems to be required within the animals' home range to assure year-round food availability. At high tree species diversity tree species essential for survival might be diluted by resources which are of no use for lemurs, thus increasing energetic expenses for traveling between suitable patches. According to the present analyses, structural diversity is of subordinate importance to the number of tree species as a correlate of lemur species richness. Within limits of disturbance intensity and on a small geographic scale, disturbances increase forest productivity. Lemurs reach higher species numbers and population densities in slightly disturbed areas compared with undisturbed sites. This peaked curve of the number of lemur species over disturbance, however, may not only be a consequence of “resource dilution” in undisturbed sites and higher food abundance in slightly disturbed areas, but also a consequence of selective extinction of lemur species which were unable to cope with the disturbance regime exaggerated by human interference over the last few hundred or thousand years. Titre du périodique : Biotropica Volume : 29 (3): 331-343 En ligne : https://doi.org/10.1111/j.1744-7429.1997.tb00434.x

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Infanticide and partial cannibalism in free-ranging Coquerel’s sifaka (Propithecus coquereli) / Malcolm S. Ramsay  

Public ISBD Titre : Infanticide and partial cannibalism in free-ranging Coquerel’s sifaka (Propithecus coquereli) Type de document : texte imprimé Auteurs : Malcolm S. Ramsay ; Benjamin Morrison ; Samantha M. Stead Année de publication : 2020 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : INFATICIDE  PARTIAL CANNIBALISM  LEMURS  PROPITHECUS  MADAGASCAR Résumé : Infanticide has been observed across many primate taxa, but the extent of its occurrence is not fully understood due to difficulty in observation and uneven reporting. Several hypotheses have been proposed to explain why infanticide occurs in primates and whether it benefits some individuals within a social group. Here we report on a case of infanticide, followed by partial consumption of the infant, in a population of Coquerel’s sifaka (Propithecus coquereli) at Mariarano, Northwest Madagascar. We witnessed an adult male sifaka kill and consume part of an infant, a member of his own social group, as well as the mother’s reaction to the infanticide. Following the infanticide, the mother of the deceased infant left the social group after repeated agonistic encounters with the other group members. We evaluate how this event relates to the predictions of four common hypotheses. Further research on Coquerel’s sifaka is needed to determine the frequency of infanticide in this species, and in lemurs more generally, because infanticide is currently poorly understood in this taxon. Titre du périodique : Primates Volume : 61 :575-581 En ligne : https://doi.org/10.1007/s10329-020-00828-z Infanticide and partial cannibalism in free-ranging Coquerel’s sifaka (Propithecus coquereli) [texte imprimé] / Malcolm S. Ramsay ; Benjamin Morrison ; Samantha M. Stead . - 2020. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : INFATICIDE  PARTIAL CANNIBALISM  LEMURS  PROPITHECUS  MADAGASCAR Résumé : Infanticide has been observed across many primate taxa, but the extent of its occurrence is not fully understood due to difficulty in observation and uneven reporting. Several hypotheses have been proposed to explain why infanticide occurs in primates and whether it benefits some individuals within a social group. Here we report on a case of infanticide, followed by partial consumption of the infant, in a population of Coquerel’s sifaka (Propithecus coquereli) at Mariarano, Northwest Madagascar. We witnessed an adult male sifaka kill and consume part of an infant, a member of his own social group, as well as the mother’s reaction to the infanticide. Following the infanticide, the mother of the deceased infant left the social group after repeated agonistic encounters with the other group members. We evaluate how this event relates to the predictions of four common hypotheses. Further research on Coquerel’s sifaka is needed to determine the frequency of infanticide in this species, and in lemurs more generally, because infanticide is currently poorly understood in this taxon. Titre du périodique : Primates Volume : 61 :575-581 En ligne : https://doi.org/10.1007/s10329-020-00828-z

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

A National-Level Assessment of Lemur Hunting Pressure in Madagascar / Cortini Borgerson  

Public ISBD Titre : A National-Level Assessment of Lemur Hunting Pressure in Madagascar Type de document : texte imprimé Auteurs : Cortini Borgerson, Auteur ; Steig E. Johnson, Auteur ; Emma Hall, Auteur ; Kerry A. Brown, Auteur ; Pamela R. Narvaez-Torres, Auteur ; Be Jean Rodolph Rasolofoniaina, Auteur ; Be Noel Razafindrapaoly, Auteur ; Samuel D. Merson, Auteur ; Katherine E.T. Thompson, Auteur ; Sheila M Holmes, Auteur ; Edward E. Louis Jr, Auteur ; Christopher D. Golden, Auteur Année de publication : 2021 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : BUSHMEAT  HUNTING  LEMURS  MADAGASCAR  PRIMATE  WIDLLIFE Résumé : Hunting is one of the greatest threats to nonhuman primates worldwide. Despite Madagascar’s status as a primate mega-diversity country, a critical lack of information on the hunting of lemurs at the national scale persists. Here, we synthesize the current state of knowledge of the annual rates of household-level lemur hunting near ten protected areas, representing most ecoregions in Madagascar. We examine geographic and taxonomic variation in lemur hunting, including an analysis of hunting relative to species density, extinction risk, and intrinsic ecological characteristics of species. We found that lemurs are commonly hunted across Madagascar; the rural households in our study ate, on average, more than one lemur each year, or a median of 4.1% of the lemur species’ population size where densities are known. However, this pressure varied significantly across sites and species, reaching its highest levels in the northeastern rainforest region. While hunting levels are concerning for numerous threatened species, hunting pressure was driven primarily by species availability, and among ecological traits, small body size was related to increased hunting; however, conservation status showed no such relationship. This first national-level assessment of hunting, including one-third of Madagascar’s lemur species and more than a tenth of the world’s primates, identifies regional variation and lemur taxa at acute risk from hunting—important steps toward developing targeted strategies to conserve one of the world’s most threatened groups of vertebrates. Titre du périodique : International Journal of Primatology Volume : 43: 92-113 En ligne : https://doi.org/10.1007/s10764-021-00215-5 A National-Level Assessment of Lemur Hunting Pressure in Madagascar [texte imprimé] / Cortini Borgerson, Auteur ; Steig E. Johnson, Auteur ; Emma Hall, Auteur ; Kerry A. Brown, Auteur ; Pamela R. Narvaez-Torres, Auteur ; Be Jean Rodolph Rasolofoniaina, Auteur ; Be Noel Razafindrapaoly, Auteur ; Samuel D. Merson, Auteur ; Katherine E.T. Thompson, Auteur ; Sheila M Holmes, Auteur ; Edward E. Louis Jr, Auteur ; Christopher D. Golden, Auteur . - 2021. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : BUSHMEAT  HUNTING  LEMURS  MADAGASCAR  PRIMATE  WIDLLIFE Résumé : Hunting is one of the greatest threats to nonhuman primates worldwide. Despite Madagascar’s status as a primate mega-diversity country, a critical lack of information on the hunting of lemurs at the national scale persists. Here, we synthesize the current state of knowledge of the annual rates of household-level lemur hunting near ten protected areas, representing most ecoregions in Madagascar. We examine geographic and taxonomic variation in lemur hunting, including an analysis of hunting relative to species density, extinction risk, and intrinsic ecological characteristics of species. We found that lemurs are commonly hunted across Madagascar; the rural households in our study ate, on average, more than one lemur each year, or a median of 4.1% of the lemur species’ population size where densities are known. However, this pressure varied significantly across sites and species, reaching its highest levels in the northeastern rainforest region. While hunting levels are concerning for numerous threatened species, hunting pressure was driven primarily by species availability, and among ecological traits, small body size was related to increased hunting; however, conservation status showed no such relationship. This first national-level assessment of hunting, including one-third of Madagascar’s lemur species and more than a tenth of the world’s primates, identifies regional variation and lemur taxa at acute risk from hunting—important steps toward developing targeted strategies to conserve one of the world’s most threatened groups of vertebrates. Titre du périodique : International Journal of Primatology Volume : 43: 92-113 En ligne : https://doi.org/10.1007/s10764-021-00215-5

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Population status of the Alaotran gentle lemur Hapalemur griseus alaotrensis  

Public ISBD Titre : Population status of the Alaotran gentle lemur Hapalemur griseus alaotrensis Type de document : texte imprimé Année de publication : 2009 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : ALAOTRA  CONSERVATION  HUNTING  LEMURS  MADAGASCAR Résumé : The results of a field census of Alaotran gentle lemurs Hapalemur griseus alaotrensis carried out in February and March 1999 are reported. The results are compared with a census carried out 5 years earlier in 1994. Both censuses followed the same methods and were carried out by the same team, using direct observation from canoe. Mean group encounter rates for the lemur were assessed in each location, which allowed us to calculate the relative group density in each site. Qualitative information on habitat condition (on the basis of plant diversity, vegetation height and evidence of burning) was gathered at each site. Additional information, mainly on lemur hunting, was acquired through interviews with local people. In most sites group encounter rate was at least 50 per cent lower than 5 years before. Taking into account unusually low water levels because of a drought at Lac Alaotra in 1999, we estimate that these encounter rates reflect a 30 per cent decline in the total population size over the last 5 years. The main cause of this dramatic decrease was human induced fire (habitat degradation) coupled with heavy hunting (poaching of lemurs for food). The importance of assessing regularly both population status and threats, and of adjusting conservation actions accordingly is emphasized Titre du périodique : Oryx Volume : 35(2): 152-157 En ligne : https://doi.org/10.1046/j.1365-3008.2001.00167.x Population status of the Alaotran gentle lemur Hapalemur griseus alaotrensis [texte imprimé] . - 2009. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : ALAOTRA  CONSERVATION  HUNTING  LEMURS  MADAGASCAR Résumé : The results of a field census of Alaotran gentle lemurs Hapalemur griseus alaotrensis carried out in February and March 1999 are reported. The results are compared with a census carried out 5 years earlier in 1994. Both censuses followed the same methods and were carried out by the same team, using direct observation from canoe. Mean group encounter rates for the lemur were assessed in each location, which allowed us to calculate the relative group density in each site. Qualitative information on habitat condition (on the basis of plant diversity, vegetation height and evidence of burning) was gathered at each site. Additional information, mainly on lemur hunting, was acquired through interviews with local people. In most sites group encounter rate was at least 50 per cent lower than 5 years before. Taking into account unusually low water levels because of a drought at Lac Alaotra in 1999, we estimate that these encounter rates reflect a 30 per cent decline in the total population size over the last 5 years. The main cause of this dramatic decrease was human induced fire (habitat degradation) coupled with heavy hunting (poaching of lemurs for food). The importance of assessing regularly both population status and threats, and of adjusting conservation actions accordingly is emphasized Titre du périodique : Oryx Volume : 35(2): 152-157 En ligne : https://doi.org/10.1046/j.1365-3008.2001.00167.x

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Bushmeat hunting and use in the Makira Forest, north-eastern Madagascar: a conservation and livelihoods issue / Christopher D. Golden  

Public ISBD Titre : Bushmeat hunting and use in the Makira Forest, north-eastern Madagascar: a conservation and livelihoods issue Type de document : texte imprimé Auteurs : Christopher D. Golden, Auteur Année de publication : 2009 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CRYPTOPROCTA FEROX  EULEMUR ALBIFRONS  HAPALEMUR GRISEUS  INDRI INDRI  LEMURS  MADAGASCAR  SUSTAINABILITY ASSESSMENT  VARECIA VARIEGATA Résumé : In the 2003 Durban Vision the Malagasy government committed to tripling the amount of protected areas in Madagascar by 2009. This extensive expansion needs to involve an assessment of the potential impacts on the people who rely on forest resources for subsistence. Wildlife for human consumption (bushmeat) is one such resource that has received great attention on mainland Africa but has largely been ignored in Madagascar until recently. In terms of biomass, hunting in Madagascar appears to be on a lesser scale compared to areas of mainland Africa. However, because of the life-history characteristics associated with hunted primate and carnivore species in Madagascar even small-scale hunting is a major threat to long-term conservation. In this study I used semi-structured interviews to quantify annual rates of bushmeat harvest in 14 villages adjacent to the Makira Forest in north-eastern Madagascar. Interviews revealed that 23 mammal species were hunted for consumption, providing a new insight into the scale and frequency of bushmeat use. Harvest data and life-history information were sufficient to allow quantitative assessments of sustainability for four species of lemur (black and white ruffed lemur Varecia variegata, indri Indri indri, eastern bamboo lemur Hapalemur griseus and white-fronted brown lemur Eulemur albifrons) and a species of the carnivore family Eupleridae (fossa Cryptoprocta ferox). Model results suggest hunting of these species is probably unsustainable. This research presents clear evidence that hunting is a major conservation and livelihoods issue in Madagascar and needs to be considered in the planning stages of protected area development to address better the needs of local people. Titre du périodique : Oryx Volume : 43 (3): 386-392 En ligne : DOI: https://doi.org/10.1017/S0030605309000131 Bushmeat hunting and use in the Makira Forest, north-eastern Madagascar: a conservation and livelihoods issue [texte imprimé] / Christopher D. Golden, Auteur . - 2009. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CRYPTOPROCTA FEROX  EULEMUR ALBIFRONS  HAPALEMUR GRISEUS  INDRI INDRI  LEMURS  MADAGASCAR  SUSTAINABILITY ASSESSMENT  VARECIA VARIEGATA Résumé : In the 2003 Durban Vision the Malagasy government committed to tripling the amount of protected areas in Madagascar by 2009. This extensive expansion needs to involve an assessment of the potential impacts on the people who rely on forest resources for subsistence. Wildlife for human consumption (bushmeat) is one such resource that has received great attention on mainland Africa but has largely been ignored in Madagascar until recently. In terms of biomass, hunting in Madagascar appears to be on a lesser scale compared to areas of mainland Africa. However, because of the life-history characteristics associated with hunted primate and carnivore species in Madagascar even small-scale hunting is a major threat to long-term conservation. In this study I used semi-structured interviews to quantify annual rates of bushmeat harvest in 14 villages adjacent to the Makira Forest in north-eastern Madagascar. Interviews revealed that 23 mammal species were hunted for consumption, providing a new insight into the scale and frequency of bushmeat use. Harvest data and life-history information were sufficient to allow quantitative assessments of sustainability for four species of lemur (black and white ruffed lemur Varecia variegata, indri Indri indri, eastern bamboo lemur Hapalemur griseus and white-fronted brown lemur Eulemur albifrons) and a species of the carnivore family Eupleridae (fossa Cryptoprocta ferox). Model results suggest hunting of these species is probably unsustainable. This research presents clear evidence that hunting is a major conservation and livelihoods issue in Madagascar and needs to be considered in the planning stages of protected area development to address better the needs of local people. Titre du périodique : Oryx Volume : 43 (3): 386-392 En ligne : DOI: https://doi.org/10.1017/S0030605309000131

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  

Public ISBD 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, Densité Mots-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, Densité Mots-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

Edge Effects on the Density of Cheirogaleus major / Shawn M Lehman  

Public ISBD Titre : Edge Effects on the Density of Cheirogaleus major Type de document : texte imprimé Auteurs : Shawn M Lehman, Auteur ; A. Rajaonson, Auteur ; Sabine Day, Auteur Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : EDGE EFFECTS  FRUIT ABUNDANCE  LEMURS  MADAGASCAR  PREDATION  SPATIAL AUTOCORRELATION Résumé : We investigated how greater dwarf lemur (Cheirogaleus major) densities, ambient air temperature, and dendrometrics (tree height and diameter) varied along forest edge-interior gradients in the Vohibola III Classified Forest in SE Madagascar. We also assessed if spatial variations in densities of Cheirogaleus major provide indirect evidence of increased predation pressure in the transition zone between edge and interior forest habitats, i.e., an ecological trap. We conducted diurnal temperature surveys (N = 394) and nocturnal surveys of Cheirogaleus major (N = 182) over 2 yr along 4 1250-m transects that ran perpendicular to the forest edge in Vohibola III. We did not see Cheirogaleus major from May to mid-September, and the highest sighting frequency occurred during October–November. Cheirogaleus major exhibited a negative edge response because densities ranged from low levels in edge habitats to higher levels in the forest interior. After we tested for spatial autocorrelation, edge-related variations in densities of Cheirogaleus major covaried most strongly with tree diameter. Edge responses of Cheirogaleus major may reflect spatial variations in fruit and liana abundance, though data are needed on the precise relationship between tree diameter and food production to confirm the relationship. Edge-related variations in densities of Cheirogaleus major may also provide indirect evidence of an ecological trap. Testing and controlling for spatial autocorrelation should be important components of future studies of primate conservation biology and ecology. Titre du périodique : International Journal of Primatology Volume : 27:1569-1588 En ligne : https://doi.org/10.1007/s10764-006-9099-z Edge Effects on the Density of Cheirogaleus major [texte imprimé] / Shawn M Lehman, Auteur ; A. Rajaonson, Auteur ; Sabine Day, Auteur . - 2006. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : EDGE EFFECTS  FRUIT ABUNDANCE  LEMURS  MADAGASCAR  PREDATION  SPATIAL AUTOCORRELATION Résumé : We investigated how greater dwarf lemur (Cheirogaleus major) densities, ambient air temperature, and dendrometrics (tree height and diameter) varied along forest edge-interior gradients in the Vohibola III Classified Forest in SE Madagascar. We also assessed if spatial variations in densities of Cheirogaleus major provide indirect evidence of increased predation pressure in the transition zone between edge and interior forest habitats, i.e., an ecological trap. We conducted diurnal temperature surveys (N = 394) and nocturnal surveys of Cheirogaleus major (N = 182) over 2 yr along 4 1250-m transects that ran perpendicular to the forest edge in Vohibola III. We did not see Cheirogaleus major from May to mid-September, and the highest sighting frequency occurred during October–November. Cheirogaleus major exhibited a negative edge response because densities ranged from low levels in edge habitats to higher levels in the forest interior. After we tested for spatial autocorrelation, edge-related variations in densities of Cheirogaleus major covaried most strongly with tree diameter. Edge responses of Cheirogaleus major may reflect spatial variations in fruit and liana abundance, though data are needed on the precise relationship between tree diameter and food production to confirm the relationship. Edge-related variations in densities of Cheirogaleus major may also provide indirect evidence of an ecological trap. Testing and controlling for spatial autocorrelation should be important components of future studies of primate conservation biology and ecology. Titre du périodique : International Journal of Primatology Volume : 27:1569-1588 En ligne : https://doi.org/10.1007/s10764-006-9099-z

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Effects of forest structure and composition on food availability for Varecia variegata at Ranomafana National Park, Madagascar / Elizabeth A. Balko  

Public ISBD Titre : Effects of forest structure and composition on food availability for Varecia variegata at Ranomafana National Park, Madagascar Type de document : texte imprimé Auteurs : Elizabeth A. Balko, Auteur ; H. Brian Underwood, Auteur Année de publication : 2005 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : LEMURS  MADAGASCAR  LOGGING  PHENOLOGY Résumé : We present a summary of a long-term field study that examined the effects of forest disturbance on the availability of palatable fruit and its utilization by V. variegata. Forest structure and tree species composition were measured in three adjacent study areas, with different histories of disturbance, in Ranomafana National Park (RNP), Madagascar. V. variegata abundance was monitored by frequent encounters with resident groups and periodic censuses conducted along trails. Finally, the abundance of mature fruit in species used by V. variegata was scored monthly at representative trees at several locations. V. variegata abundance was most consistent in the least anthropogenically disturbed site, while no established lemur groups were observed in the heavily logged site for over a decade post-harvest. Lemur abundance was variable in the selectively logged site. The presence of select food trees, particularly specimens with voluminous crowns capable of producing abundant fruit crops, appears to be key to the establishment and expansion of V. variegata groups. Our analysis of year-long fruit utilization revealed a high degree of preference for several species of trees. Two species exhibited mature fruit in a low percentage of stems but were available for a protracted period of time, while two additional species showed high intraspecific fruiting synchrony and were available for a shorter period of time. These contrasting phenologies, rather than the individual tree species, may be most important to V. variegata due to their coincident timing of fruit maturation with key lemur life-history events. Any disturbance–natural or anthropogenic–that disrupts the phenology cycles of food trees has the potential to impact lemur abundance and dispersion. Intense disturbances, such as heavy logging or severe cyclones, have long-lasting impacts on fruit production, while selective logging or moderate cyclonic windthrow cause more transient impacts. V. variegata is adapted to deal with an intrinsically erratic food supply by virtue of its reproductive biology and social behavior Titre du périodique : American Journal of Primatology Volume : 66: 45-70 En ligne : https://doi.org/10.1002/ajp.20127 Effects of forest structure and composition on food availability for Varecia variegata at Ranomafana National Park, Madagascar [texte imprimé] / Elizabeth A. Balko, Auteur ; H. Brian Underwood, Auteur . - 2005. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : LEMURS  MADAGASCAR  LOGGING  PHENOLOGY Résumé : We present a summary of a long-term field study that examined the effects of forest disturbance on the availability of palatable fruit and its utilization by V. variegata. Forest structure and tree species composition were measured in three adjacent study areas, with different histories of disturbance, in Ranomafana National Park (RNP), Madagascar. V. variegata abundance was monitored by frequent encounters with resident groups and periodic censuses conducted along trails. Finally, the abundance of mature fruit in species used by V. variegata was scored monthly at representative trees at several locations. V. variegata abundance was most consistent in the least anthropogenically disturbed site, while no established lemur groups were observed in the heavily logged site for over a decade post-harvest. Lemur abundance was variable in the selectively logged site. The presence of select food trees, particularly specimens with voluminous crowns capable of producing abundant fruit crops, appears to be key to the establishment and expansion of V. variegata groups. Our analysis of year-long fruit utilization revealed a high degree of preference for several species of trees. Two species exhibited mature fruit in a low percentage of stems but were available for a protracted period of time, while two additional species showed high intraspecific fruiting synchrony and were available for a shorter period of time. These contrasting phenologies, rather than the individual tree species, may be most important to V. variegata due to their coincident timing of fruit maturation with key lemur life-history events. Any disturbance–natural or anthropogenic–that disrupts the phenology cycles of food trees has the potential to impact lemur abundance and dispersion. Intense disturbances, such as heavy logging or severe cyclones, have long-lasting impacts on fruit production, while selective logging or moderate cyclonic windthrow cause more transient impacts. V. variegata is adapted to deal with an intrinsically erratic food supply by virtue of its reproductive biology and social behavior Titre du périodique : American Journal of Primatology Volume : 66: 45-70 En ligne : https://doi.org/10.1002/ajp.20127

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Foramen infra orbitaire: Implication au regime alimentaire des lémuriens subfossiles Malagasy  

Public ISBD Titre : Foramen infra orbitaire: Implication au regime alimentaire des lémuriens subfossiles Malagasy Type de document : texte imprimé Editeur : Antananarivo [Madagasikara] : Université d'Antananarivo (Faculté de Sciences) Année de publication : 2010 Importance : 57 p. Présentation : 112 réf.; 12 ill.; 13 tab. Langues : Français (fre) Langues originales : Français (fre) Catégories : LEMURIENS LEMURIENS:Fossiles, Musée Mots-clés : LEMURS  SUBFOSSILS  INFRA ORBITAIRE FORAMEN  DIETS Résumé : Le foramen infra orbitaire (FIO), qui est situé en dessous de l’orbite, laisse passer le nerf infra orbitaire aux cellules sensorielles spécialisées (mécanorécepteurs) dans la région maxillaire. Cette étude consiste à voir la relation entre le régime alimentaire de Primates actuels et la taille de foramen infra orbitaire (FIO), puis son implication à la paléoécologie des Lémuriens subfossiles malagasy. Il en résulte qu’une relation significative a été trouvée entre la taille de foramen infra orbitaire et le régime alimentaire. Les Frugivores et les Folivores ont un plus grand foramen infra orbitaire par rapport à celui des Insectivores. Les Lémuriens subfossiles étaient Frugivores et Folivores : ces profils étaient liés à leur paléo environnement et leur taille. Le foramen infra orbitaire est ainsi considéré comme un caractère instructif pour déterminer et interpréter la paléoécologie des Primates fossiles. En ligne : http://biblio.univ-antananarivo.mg/pdfs/tongasoaLydia_SN_M2_10.pdf Foramen infra orbitaire: Implication au regime alimentaire des lémuriens subfossiles Malagasy [texte imprimé] . - Antananarivo [Madagasikara] : Université d'Antananarivo (Faculté de Sciences), 2010 . - 57 p. : 112 réf.; 12 ill.; 13 tab. Langues : Français (fre) Langues originales : Français (fre) Catégories : LEMURIENS LEMURIENS:Fossiles, Musée Mots-clés : LEMURS  SUBFOSSILS  INFRA ORBITAIRE FORAMEN  DIETS Résumé : Le foramen infra orbitaire (FIO), qui est situé en dessous de l’orbite, laisse passer le nerf infra orbitaire aux cellules sensorielles spécialisées (mécanorécepteurs) dans la région maxillaire. Cette étude consiste à voir la relation entre le régime alimentaire de Primates actuels et la taille de foramen infra orbitaire (FIO), puis son implication à la paléoécologie des Lémuriens subfossiles malagasy. Il en résulte qu’une relation significative a été trouvée entre la taille de foramen infra orbitaire et le régime alimentaire. Les Frugivores et les Folivores ont un plus grand foramen infra orbitaire par rapport à celui des Insectivores. Les Lémuriens subfossiles étaient Frugivores et Folivores : ces profils étaient liés à leur paléo environnement et leur taille. Le foramen infra orbitaire est ainsi considéré comme un caractère instructif pour déterminer et interpréter la paléoécologie des Primates fossiles. En ligne : http://biblio.univ-antananarivo.mg/pdfs/tongasoaLydia_SN_M2_10.pdf

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Lemur species-specific metapopulation responses to habitat loss and fragmentation / Travis S. Steffens  

Public ISBD Titre : Lemur species-specific metapopulation responses to habitat loss and fragmentation Type de document : texte imprimé Auteurs : Travis S. Steffens, Auteur ; Shawn M. Lehman, Auteur Année de publication : 2018 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : LEMURS  METAPOPULATION  FRAGMENTS  DRY DECIDUOUS FOREST  ANKARAFANTSIKA Résumé : Determining what factors affect species occurrence is vital to the study of primate biogeography. We investigated the metapopulation dynamics of a lemur community consisting of eight species (Avahi occidentalis, Propithecus coquereli, Microcebus murinus, Microcebus ravelobensis, Lepilemur edwardsi, Cheirogaleus medius, Eulemur mongoz, and Eulemur fulvus) within fragmented tropical dry deciduous forest habitat in Ankarafantsika National Park, Madagascar. We measured fragment size and isolation of 42 fragments of forest ranging in size from 0.23 to 117.7 ha adjacent to continuous forest. Between June and November 2011, we conducted 1218 surveys and observed six of eight lemur species (M. murinus, M. ravelobensis, C. medius, E. fulvus, P. coquereli, and L. edwardsi) in the 42 fragments. We applied among patch incidence function models (IFMs) with various measures of dispersal and a mainland-island IFM to lemur species occurrence, with the aim of answering the following questions: 1) Do lemur species in dry deciduous forest fragments form metapopulations? 2) What are the separate effects of area (extinction risk) and connectivity/isolation (colonization potential) within a lemur metapopulation? 3) Within simulated metapopulations over time, how do area and connectivity/isolation affect occurrence? and 4) What are the conservation implications of our findings? We found that M. murinus formed either a mainland-island or an among patch metapopulation, M. ravelobensis formed a mainland-island metapopulation, C. medius and E. fulvus formed among patch metapopulations, and neither P. coquereli or L. edwardsi formed a metapopulation. Metapopulation dynamics and simulations suggest that area was a more consistent positive factor determining lemur species occurrence than fragment isolation and is crucial to the maintenance of lemur populations within this fragmented landscape. Using a metapopulation approach to lemur biogeography is critical for understanding how lemur species respond to forest loss and fragmentation. Titre du périodique : PLoS ONE Volume : 13(5): e0195791. En ligne : https://doi.org/10.1371/journal.pone.0195791 Lemur species-specific metapopulation responses to habitat loss and fragmentation [texte imprimé] / Travis S. Steffens, Auteur ; Shawn M. Lehman, Auteur . - 2018. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Fragmentation, Habitat Mots-clés : LEMURS  METAPOPULATION  FRAGMENTS  DRY DECIDUOUS FOREST  ANKARAFANTSIKA Résumé : Determining what factors affect species occurrence is vital to the study of primate biogeography. We investigated the metapopulation dynamics of a lemur community consisting of eight species (Avahi occidentalis, Propithecus coquereli, Microcebus murinus, Microcebus ravelobensis, Lepilemur edwardsi, Cheirogaleus medius, Eulemur mongoz, and Eulemur fulvus) within fragmented tropical dry deciduous forest habitat in Ankarafantsika National Park, Madagascar. We measured fragment size and isolation of 42 fragments of forest ranging in size from 0.23 to 117.7 ha adjacent to continuous forest. Between June and November 2011, we conducted 1218 surveys and observed six of eight lemur species (M. murinus, M. ravelobensis, C. medius, E. fulvus, P. coquereli, and L. edwardsi) in the 42 fragments. We applied among patch incidence function models (IFMs) with various measures of dispersal and a mainland-island IFM to lemur species occurrence, with the aim of answering the following questions: 1) Do lemur species in dry deciduous forest fragments form metapopulations? 2) What are the separate effects of area (extinction risk) and connectivity/isolation (colonization potential) within a lemur metapopulation? 3) Within simulated metapopulations over time, how do area and connectivity/isolation affect occurrence? and 4) What are the conservation implications of our findings? We found that M. murinus formed either a mainland-island or an among patch metapopulation, M. ravelobensis formed a mainland-island metapopulation, C. medius and E. fulvus formed among patch metapopulations, and neither P. coquereli or L. edwardsi formed a metapopulation. Metapopulation dynamics and simulations suggest that area was a more consistent positive factor determining lemur species occurrence than fragment isolation and is crucial to the maintenance of lemur populations within this fragmented landscape. Using a metapopulation approach to lemur biogeography is critical for understanding how lemur species respond to forest loss and fragmentation. Titre du périodique : PLoS ONE Volume : 13(5): e0195791. En ligne : https://doi.org/10.1371/journal.pone.0195791

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire