Confirmation génétique du lémurien sportif Anjiamangirana dans la forêt d'Anjajavy / Elodi Rambeloson in LEMUR NEWS, 23 ([01/12/2021])  

Public ISBD [article]  inLEMUR NEWS > 23 [01/12/2021] . - p. 51-55 Titre : Confirmation génétique du lémurien sportif Anjiamangirana dans la forêt d'Anjajavy Titre original : Genetic confirmation of the Anjiamangirana sportive lemur in the Anjajavy Forest Type de document : texte imprimé Auteurs : Elodi Rambeloson, Auteur ; Hoby A. Rasoanaivo, Auteur ; Elaine E. Guevar, Auteur ; Lydia K. Greene, Auteur ; Marina B. Blanco, Auteur ; Anne D. Yoder, Auteur Année de publication : 2021 Article en page(s) : p. 51-55 Langues : Anglais (eng) Catégories : LEMURIENS SCIENCES DE LA VIE SCIENCES DE L'ENVIRONNEMENT Mots-clés : PRIMATE  HABITAT  RECENSEMENT DE POPULATION  RÉSERVE NATURELLE  MADAGASIKARA  GENUS LEPILEMUR  L. GREWCOCKORUM  IDENTIFICATION GENETIQUE Index. décimale : 570 Sciences de la vie. Biologie Résumé : La plupart des lémuriens de Madagascar sont nocturnes, et la plupart des lémuriens nocturnes sont cryptiques, ce qui les rend difficiles à différencier en raison de leur similitude morphologique. Les lémuriens sportifs (genre Lepilemur) en sont un bon exemple et font l'objet d'un débat taxonomique permanent depuis des décennies. Vingt-six espèces de lémuriens sportifs sont actuellement reconnues, sur la base d'études cytogénétiques précoces et d'études génétiques plus récentes. En raison des réarrangements taxonomiques, la répartition des espèces a considérablement changé au fil des ans. Lors de travaux de terrain à Anjajavy, une forêt sèche à feuilles sèches le long de la côte de système inter-rivière (IRS) III, les auteurs ont collecté de manière opportuniste un échantillon de tissu d'une femelle Lepilemur. Bien que le travail de recensement ait précédemment identifié L. grewcockorum à Anjajavy et dans d'autres endroits de l'IRS III, la seule confirmation génétique de cette espèce provient des forêts intérieures d'Anjiamangirana et d'Ambongabe. Les auteurs ont séquencé un gène marqueur (Cytochrome B) et comparé les résultats à une base de données de gènes assemblée à partir de GenBank. Les résultats confirment génétiquement l'individu d'Anjajavy comme étant L. grewcockorum. Des analyses génétiques supplémentaires, associées à des sites de recensement connus, pourraient rendre cette espèce plus largement distribuée qu'on ne le pensait à l'origine. Les auteurs encouragent la poursuite des enquêtes, des travaux génétiques et comportementaux dans les parcelles forestières restantes de l'IRS III afin de clarifier l'aire de répartition réelle, les estimations de population et les caractéristiques écologiques de L. grewcockorum. Cette étude démontre l'intérêt d'utiliser la génétique pour identifier des espèces morphologiquement similaires et pour déterminer les limites de leurs aires de répartition géographique. Note de contenu : Most of Madagascar’s lemurs are nocturnal, and most nocturnal lemurs are cryptic, making congeners difficult to differentiate due to their morphological similarity. Sportive lemurs (genus Lepilemur) are a great example and have been the subject of ongoing taxonomic debate for decades. Twenty-six sportive lemur species are currently recognized, based on early cytogenetic and more recent genetic studies. As a consequence of taxonomic rearrangements, species distributions have changed significantly over the years. During fieldwork at Anjajavy, a dry deciduous forest along the coast of the Inter River System (IRS) III, we opportunistically collected a tissue sample from a female Lepilemur. Although census work previously identified L. grewcockorum in Anjajavy and other locations in the IRS III, the only genetic confirmation for this species comes from the inland forests of Anjiamangirana and Ambongabe. We sequenced a marker gene (Cytochrome B) and compared results to a gene database assembled from GenBank. Our results genetically confirm the individual from Anjajavy as L. grewcockorum. Additional genetic analyses, coupled with known census sites, might render this species more widely distributed than originally thought. We encourage further survey, genetic, and behavioral work within the remaining forest patches of the IRS III to clarify the true range, population estimates, and ecological characteristics of L. grewcockorum. This study demonstrates the value of using genetics to identify species that are morphologically similar and to determine the boundaries of their geographic ranges. Numéro du document : 16 Bull1 (Theme principale) : SCIENCE DE LA VIE Bull2 (Theme secondaire) : TAXONOMIE ANIMALE Volume : 23 En ligne : http://www.primate-sg.org/storage/pdf/LN23.pdf [article] Confirmation génétique du lémurien sportif Anjiamangirana dans la forêt d'Anjajavy = Genetic confirmation of the Anjiamangirana sportive lemur in the Anjajavy Forest [texte imprimé] / Elodi Rambeloson, Auteur ; Hoby A. Rasoanaivo, Auteur ; Elaine E. Guevar, Auteur ; Lydia K. Greene, Auteur ; Marina B. Blanco, Auteur ; Anne D. Yoder, Auteur . - 2021 . - p. 51-55. Langues : Anglais (eng) in LEMUR NEWS > 23 [01/12/2021] . - p. 51-55 Catégories : LEMURIENS SCIENCES DE LA VIE SCIENCES DE L'ENVIRONNEMENT Mots-clés : PRIMATE  HABITAT  RECENSEMENT DE POPULATION  RÉSERVE NATURELLE  MADAGASIKARA  GENUS LEPILEMUR  L. GREWCOCKORUM  IDENTIFICATION GENETIQUE Index. décimale : 570 Sciences de la vie. Biologie Résumé : La plupart des lémuriens de Madagascar sont nocturnes, et la plupart des lémuriens nocturnes sont cryptiques, ce qui les rend difficiles à différencier en raison de leur similitude morphologique. Les lémuriens sportifs (genre Lepilemur) en sont un bon exemple et font l'objet d'un débat taxonomique permanent depuis des décennies. Vingt-six espèces de lémuriens sportifs sont actuellement reconnues, sur la base d'études cytogénétiques précoces et d'études génétiques plus récentes. En raison des réarrangements taxonomiques, la répartition des espèces a considérablement changé au fil des ans. Lors de travaux de terrain à Anjajavy, une forêt sèche à feuilles sèches le long de la côte de système inter-rivière (IRS) III, les auteurs ont collecté de manière opportuniste un échantillon de tissu d'une femelle Lepilemur. Bien que le travail de recensement ait précédemment identifié L. grewcockorum à Anjajavy et dans d'autres endroits de l'IRS III, la seule confirmation génétique de cette espèce provient des forêts intérieures d'Anjiamangirana et d'Ambongabe. Les auteurs ont séquencé un gène marqueur (Cytochrome B) et comparé les résultats à une base de données de gènes assemblée à partir de GenBank. Les résultats confirment génétiquement l'individu d'Anjajavy comme étant L. grewcockorum. Des analyses génétiques supplémentaires, associées à des sites de recensement connus, pourraient rendre cette espèce plus largement distribuée qu'on ne le pensait à l'origine. Les auteurs encouragent la poursuite des enquêtes, des travaux génétiques et comportementaux dans les parcelles forestières restantes de l'IRS III afin de clarifier l'aire de répartition réelle, les estimations de population et les caractéristiques écologiques de L. grewcockorum. Cette étude démontre l'intérêt d'utiliser la génétique pour identifier des espèces morphologiquement similaires et pour déterminer les limites de leurs aires de répartition géographique. Note de contenu : Most of Madagascar’s lemurs are nocturnal, and most nocturnal lemurs are cryptic, making congeners difficult to differentiate due to their morphological similarity. Sportive lemurs (genus Lepilemur) are a great example and have been the subject of ongoing taxonomic debate for decades. Twenty-six sportive lemur species are currently recognized, based on early cytogenetic and more recent genetic studies. As a consequence of taxonomic rearrangements, species distributions have changed significantly over the years. During fieldwork at Anjajavy, a dry deciduous forest along the coast of the Inter River System (IRS) III, we opportunistically collected a tissue sample from a female Lepilemur. Although census work previously identified L. grewcockorum in Anjajavy and other locations in the IRS III, the only genetic confirmation for this species comes from the inland forests of Anjiamangirana and Ambongabe. We sequenced a marker gene (Cytochrome B) and compared results to a gene database assembled from GenBank. Our results genetically confirm the individual from Anjajavy as L. grewcockorum. Additional genetic analyses, coupled with known census sites, might render this species more widely distributed than originally thought. We encourage further survey, genetic, and behavioral work within the remaining forest patches of the IRS III to clarify the true range, population estimates, and ecological characteristics of L. grewcockorum. This study demonstrates the value of using genetics to identify species that are morphologically similar and to determine the boundaries of their geographic ranges. Numéro du document : 16 Bull1 (Theme principale) : SCIENCE DE LA VIE Bull2 (Theme secondaire) : TAXONOMIE ANIMALE Volume : 23 En ligne : http://www.primate-sg.org/storage/pdf/LN23.pdf

Climate change, predictive modeling and lemur health: Assessing impacts of changing climate on health and conservation in Madagascar / Meredith A. Barrett  

Public ISBD Titre : Climate change, predictive modeling and lemur health: Assessing impacts of changing climate on health and conservation in Madagascar Type de document : texte imprimé Auteurs : Meredith A. Barrett ; Jason L. Brown ; Randall E. Junge ; Anne D. Yoder Année de publication : 2013 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CLIMATE CHANGE  CONSERVATION LEMUR  MADAGASCAR  PARASITE  SPECIES  DISTRIBUTION MODELING Résumé : Deforestation and a changing climate threaten the health and survival of lemurs in Madagascar. An important component of lemur health, parasite infection can reduce fitness and survival outcomes. Future lemur parasite richness, abundance and distribution may be highly influenced by climate change. Current knowledge of lemur parasites is narrow in geographic and temporal scope, with sampling at a limited number of sites, and thus far, there have been no attempts to assess the effects of climate change on lemur parasite distributions. We used geospatial tools to predict the distributions of six lemur parasites of high frequency and pathogenic potential. We then assessed how anticipated climate shifts in Madagascar may alter the distributions of these lemur parasites in the future. Under current climate conditions, we found that the focal parasites exhibited widespread potential distributions across Madagascar, covering 12–26% of surface land area and 40–86% of forested area. Our analyses also showed that parasites responded differently to projected climate changes, with shifts ranging from a contraction of current distributions by 7% to an expansion of 60%. A predicted net expansion in parasite distribution may expose naive lemur hosts to new parasites, which could have a profound effect on lemur health. Those parasites with the greatest potential for harmful effects are predicted to experience the largest expansion in range. Predicting these changing distributions will be critical for assessing population health, improving protected area design, preparing for reintroduction efforts and addressing potential parasite risk in lemurs, humans and domestic animals. Titre du périodique : Biological Conservation Volume : 157: 409-422 En ligne : https://doi.org/10.1016/j.biocon.2012.09.003 Climate change, predictive modeling and lemur health: Assessing impacts of changing climate on health and conservation in Madagascar [texte imprimé] / Meredith A. Barrett ; Jason L. Brown ; Randall E. Junge ; Anne D. Yoder . - 2013. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : CLIMATE CHANGE  CONSERVATION LEMUR  MADAGASCAR  PARASITE  SPECIES  DISTRIBUTION MODELING Résumé : Deforestation and a changing climate threaten the health and survival of lemurs in Madagascar. An important component of lemur health, parasite infection can reduce fitness and survival outcomes. Future lemur parasite richness, abundance and distribution may be highly influenced by climate change. Current knowledge of lemur parasites is narrow in geographic and temporal scope, with sampling at a limited number of sites, and thus far, there have been no attempts to assess the effects of climate change on lemur parasite distributions. We used geospatial tools to predict the distributions of six lemur parasites of high frequency and pathogenic potential. We then assessed how anticipated climate shifts in Madagascar may alter the distributions of these lemur parasites in the future. Under current climate conditions, we found that the focal parasites exhibited widespread potential distributions across Madagascar, covering 12–26% of surface land area and 40–86% of forested area. Our analyses also showed that parasites responded differently to projected climate changes, with shifts ranging from a contraction of current distributions by 7% to an expansion of 60%. A predicted net expansion in parasite distribution may expose naive lemur hosts to new parasites, which could have a profound effect on lemur health. Those parasites with the greatest potential for harmful effects are predicted to experience the largest expansion in range. Predicting these changing distributions will be critical for assessing population health, improving protected area design, preparing for reintroduction efforts and addressing potential parasite risk in lemurs, humans and domestic animals. Titre du périodique : Biological Conservation Volume : 157: 409-422 En ligne : https://doi.org/10.1016/j.biocon.2012.09.003

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Genetic tests of the taxonomic status of the ring-tailed lemur (Lemur catta) from the high mountain zone of the Andringitra Massif, Madagascar / Anne D. Yoder ; Jodi A. Irwin ; Goodman, Steven M. ; Soava V. Rakotoarisoa  

Public ISBD Titre : Genetic tests of the taxonomic status of the ring-tailed lemur (Lemur catta) from the high mountain zone of the Andringitra Massif, Madagascar Type de document : texte imprimé Auteurs : Anne D. Yoder ; Jodi A. Irwin ; Goodman, Steven M. ; Soava V. Rakotoarisoa Année de publication : 2006 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Génétique, Parasite, Maladie Mots-clés : LEMUR CATTA  MTDNA  MADAGASCAR  PRIMATES  STREPSIRRHINI  SPECIES IDENTIFICATION Résumé : A recent survey of the high-mountain zone of the Madagascar Parc National (PN) d'Andringitra revealed the presence of an apparently isolated troop of the ring-tailed lemur Lemur catta. These animals display phenotypic and ecological characteristics that are unusual for the monotypic genus Lemur, thus raising the possibility that they are members of a different undescribed species. We present analyses of two mitochondrial genes to test the hypothesis that L. catta from Andringitra should be considered a distinct species. The results indicate that taxonomic revision is not warranted under the expectations of the phylogenetic, coalescent, or biological species concepts. Rather, the genetic patterns observed among the Andringitra and lowland mitochondrial haplotypes are consistent with those expected for a single species. En ligne : https://doi.org/10.1111/j.1469-7998.2000.tb00814.x Genetic tests of the taxonomic status of the ring-tailed lemur (Lemur catta) from the high mountain zone of the Andringitra Massif, Madagascar [texte imprimé] / Anne D. Yoder ; Jodi A. Irwin ; Goodman, Steven M. ; Soava V. Rakotoarisoa . - 2006. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Génétique, Parasite, Maladie Mots-clés : LEMUR CATTA  MTDNA  MADAGASCAR  PRIMATES  STREPSIRRHINI  SPECIES IDENTIFICATION Résumé : A recent survey of the high-mountain zone of the Madagascar Parc National (PN) d'Andringitra revealed the presence of an apparently isolated troop of the ring-tailed lemur Lemur catta. These animals display phenotypic and ecological characteristics that are unusual for the monotypic genus Lemur, thus raising the possibility that they are members of a different undescribed species. We present analyses of two mitochondrial genes to test the hypothesis that L. catta from Andringitra should be considered a distinct species. The results indicate that taxonomic revision is not warranted under the expectations of the phylogenetic, coalescent, or biological species concepts. Rather, the genetic patterns observed among the Andringitra and lowland mitochondrial haplotypes are consistent with those expected for a single species. En ligne : https://doi.org/10.1111/j.1469-7998.2000.tb00814.x

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Shifting ranges and conservation challenges for lemurs in the face of climate change / Jason L. Brown  

Public ISBD Titre : Shifting ranges and conservation challenges for lemurs in the face of climate change Type de document : texte imprimé Auteurs : Jason L. Brown, Auteur ; Anne D. Yoder, Auteur Année de publication : 2015 Langues : Français (fre) Langues originales : Français (fre) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : ANUSPLIN  BIOMOD  ECOLOGICAL NICHE MODELING  ENSEMBLE  LEAST COST CORRIDORS  MADAGASCAR  MICRO-ENDEMISM  PSEUDO-ABSENCE SELECTION  SPECIES DISTRIBUTION MDELING  STREPSIRRHINI Résumé : Geospatial modeling is one of the most powerful tools available to conservation biologists for estimating current species ranges of Earth's biodiversity. Now, with the advantage of predictive climate models, these methods can be deployed for understanding future impacts on threatened biota. Here, we employ predictive modeling under a conservative estimate of future climate change to examine impacts on the future abundance and geographic distributions of Malagasy lemurs. Using distribution data from the primary literature, we employed ensemble species distribution models and geospatial analyses to predict future changes in species distributions. Current species distribution models (SDMs) were created within the BIOMOD2 framework that capitalizes on ten widely used modeling techniques. Future and current SDMs were then subtracted from each other, and areas of contraction, expansion, and stability were calculated. Model overprediction is a common issue associated Malagasy taxa. Accordingly, we introduce novel methods for incorporating biological data on dispersal potential to better inform the selection of pseudo-absence points. This study predicts that 60% of the 57 species examined will experience a considerable range of reductions in the next seventy years entirely due to future climate change. Of these species, range sizes are predicted to decrease by an average of 59.6%. Nine lemur species (16%) are predicted to expand their ranges, and 13 species (22.8%) distribution sizes were predicted to be stable through time. Species ranges will experience severe shifts, typically contractions, and for the majority of lemur species, geographic distributions will be considerably altered. We identify three areas in dire need of protection, concluding that strategically managed forest corridors must be a key component of lemur and other biodiversity conservation strategies. This recommendation is all the more urgent given that the results presented here do not take into account patterns of ongoing habitat destruction relating to human activities Titre du périodique : Ecology and Evolution Volume : 5(6): 1131-1142 En ligne : https://doi.org/10.1002/ece3.1418 Shifting ranges and conservation challenges for lemurs in the face of climate change [texte imprimé] / Jason L. Brown, Auteur ; Anne D. Yoder, Auteur . - 2015. Langues : Français (fre) Langues originales : Français (fre) Catégories : LEMURIENS LEMURIENS:Conservation , Education , Ecotourisme Mots-clés : ANUSPLIN  BIOMOD  ECOLOGICAL NICHE MODELING  ENSEMBLE  LEAST COST CORRIDORS  MADAGASCAR  MICRO-ENDEMISM  PSEUDO-ABSENCE SELECTION  SPECIES DISTRIBUTION MDELING  STREPSIRRHINI Résumé : Geospatial modeling is one of the most powerful tools available to conservation biologists for estimating current species ranges of Earth's biodiversity. Now, with the advantage of predictive climate models, these methods can be deployed for understanding future impacts on threatened biota. Here, we employ predictive modeling under a conservative estimate of future climate change to examine impacts on the future abundance and geographic distributions of Malagasy lemurs. Using distribution data from the primary literature, we employed ensemble species distribution models and geospatial analyses to predict future changes in species distributions. Current species distribution models (SDMs) were created within the BIOMOD2 framework that capitalizes on ten widely used modeling techniques. Future and current SDMs were then subtracted from each other, and areas of contraction, expansion, and stability were calculated. Model overprediction is a common issue associated Malagasy taxa. Accordingly, we introduce novel methods for incorporating biological data on dispersal potential to better inform the selection of pseudo-absence points. This study predicts that 60% of the 57 species examined will experience a considerable range of reductions in the next seventy years entirely due to future climate change. Of these species, range sizes are predicted to decrease by an average of 59.6%. Nine lemur species (16%) are predicted to expand their ranges, and 13 species (22.8%) distribution sizes were predicted to be stable through time. Species ranges will experience severe shifts, typically contractions, and for the majority of lemur species, geographic distributions will be considerably altered. We identify three areas in dire need of protection, concluding that strategically managed forest corridors must be a key component of lemur and other biodiversity conservation strategies. This recommendation is all the more urgent given that the results presented here do not take into account patterns of ongoing habitat destruction relating to human activities Titre du périodique : Ecology and Evolution Volume : 5(6): 1131-1142 En ligne : https://doi.org/10.1002/ece3.1418

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

---

1 (1 - 4 / 4)