Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons / Volampeno, M.S.N., Masters, J.C., Downs, C.T.  

Public ISBD Titre : Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons Type de document : texte imprimé Auteurs : Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur Année de publication : 2011 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : ANKARAFA FOREST  CONSERVATION STRATEGY  EULEMUR FLAVIFRONS  POPULATION VIABILITY ANALYSIS  VORTEX Résumé : Population viability analysis is an important tool to assess the extinction risk in small populations of highly specialized primates. The blue-eyed black lemur (Eulemur flavifrons) is critically endangered with a restricted range in the north-western dry deciduous forest of Madagascar, where habitat fragmentation and loss of forest connectivity threaten its survival. We performed a population viability analysis (PVA) of this lemur in Ankarafa Forest in the Sahamalaza Peninsula National Park, north-western Madagascar, to determine the demographic parameters most influential for population persistence and to assess extinction probabilities. We conducted PVA analyses using different demographic parameters which characterize the species including reproduction, lifespan and population size using the software VORTEX for six scenarios with 100 iterations and simulated over 100 years. The simulations suggested the first extinction within 13 years when the percentage of habitat destruction increased up to 12%. Severe habitat destruction such as fire and logging was the major cause which led to the risk of population extinction. Conservation strategies, in particular measures to reduce habitat destruction, are proposed to ensure the survival of this critically endangered lemur. Titre du périodique : African Journal of Ecology Volume : 53 :419-427 En ligne : DOI: 10.1111/aje.12213. Home range size in the blue-eyed black lemur (Eulemur flavifrons): A comparison between dry and wet seasons [texte imprimé] / Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur . - 2011. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS:Biologie, Ecologie, Densité Mots-clés : ANKARAFA FOREST  CONSERVATION STRATEGY  EULEMUR FLAVIFRONS  POPULATION VIABILITY ANALYSIS  VORTEX Résumé : Population viability analysis is an important tool to assess the extinction risk in small populations of highly specialized primates. The blue-eyed black lemur (Eulemur flavifrons) is critically endangered with a restricted range in the north-western dry deciduous forest of Madagascar, where habitat fragmentation and loss of forest connectivity threaten its survival. We performed a population viability analysis (PVA) of this lemur in Ankarafa Forest in the Sahamalaza Peninsula National Park, north-western Madagascar, to determine the demographic parameters most influential for population persistence and to assess extinction probabilities. We conducted PVA analyses using different demographic parameters which characterize the species including reproduction, lifespan and population size using the software VORTEX for six scenarios with 100 iterations and simulated over 100 years. The simulations suggested the first extinction within 13 years when the percentage of habitat destruction increased up to 12%. Severe habitat destruction such as fire and logging was the major cause which led to the risk of population extinction. Conservation strategies, in particular measures to reduce habitat destruction, are proposed to ensure the survival of this critically endangered lemur. Titre du périodique : African Journal of Ecology Volume : 53 :419-427 En ligne : DOI: 10.1111/aje.12213.

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A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar / Volampeno, M.S.N., Masters, J.C., Downs, C.T.  

Public ISBD Titre : A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar Type de document : texte imprimé Auteurs : Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur Année de publication : 2010 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : BLUE EYED BLACK LEMUR  TOTAL COUNT  EULEMUR FLAVIFRONS  MADAGASCAR  POPULATION DENSITY  SAHAMALAZA PENINSULA Résumé : The critically endangered blue-eyed black lemur (Eulemur flavifrons) has one of the smallest distributions of any lemur, occurring only in the north-western forests of Madagascar. We report the results of a population estimate of this taxon in part of the Ankarafa Forest, Sahamalaza-Iles Radama National Park, a dry deciduous forest. We collected data between September 2007 and February 2008 using a total count method with marked individuals and known groups. In all, 228 individuals comprising 29 groups were counted. Group sizes ranged from 4 to 11 individuals with a mean of 8 ± 1.8. We estimated population density to be 1.0 individual/ha or 97.3 individuals/km2 for our study area, which is higher than previous estimates reported for Ankarafa and other sites within the Sahamalaza Peninsula. Our mean group size, however, was similar to those determined in previous studies. Both group size and density of the blue-eyed black lemur were higher within the National Park than in previous studies outside the Park. Titre du périodique : Folia Primatologica Volume : 81:305-314 En ligne : DOI: 10.1159/000322231 A population estimate of blue-eyed black lemurs in Ankarafa forest, Sahamalaza-Iles Radama National Park, Madagascar [texte imprimé] / Volampeno, M.S.N., Masters, J.C., Downs, C.T., Auteur . - 2010. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : BLUE EYED BLACK LEMUR  TOTAL COUNT  EULEMUR FLAVIFRONS  MADAGASCAR  POPULATION DENSITY  SAHAMALAZA PENINSULA Résumé : The critically endangered blue-eyed black lemur (Eulemur flavifrons) has one of the smallest distributions of any lemur, occurring only in the north-western forests of Madagascar. We report the results of a population estimate of this taxon in part of the Ankarafa Forest, Sahamalaza-Iles Radama National Park, a dry deciduous forest. We collected data between September 2007 and February 2008 using a total count method with marked individuals and known groups. In all, 228 individuals comprising 29 groups were counted. Group sizes ranged from 4 to 11 individuals with a mean of 8 ± 1.8. We estimated population density to be 1.0 individual/ha or 97.3 individuals/km2 for our study area, which is higher than previous estimates reported for Ankarafa and other sites within the Sahamalaza Peninsula. Our mean group size, however, was similar to those determined in previous studies. Both group size and density of the blue-eyed black lemur were higher within the National Park than in previous studies outside the Park. Titre du périodique : Folia Primatologica Volume : 81:305-314 En ligne : DOI: 10.1159/000322231

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