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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Population genetics and abundance of the Endangered grey-headed lemur Eulemur cinereiceps in south-east Madagascar: Assessing risks for fragmented and continuous populations
ORYX, Volume 46, No. 2, Year 2012
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Description
Knowledge of both population size and genetic diversity is critical for assessing extinction risk but few studies include concurrent estimates of these two components of population biology. We conducted an investigation of population density and size, and genetic variation and past demographic events, of the Endangered grey-headed lemur Eulemur cinereiceps in south-east Madagascar. We estimated lemur density using line-transect surveys and used satellite imagery to calculate forest fragment area in three localities. We collected tissue samples from 53 individuals and used 26 polymorphic microsatellite loci to obtain measures of population structure (divergence and diversity) across these localities. We tested the probability of past bottleneck events using three models. Contrary to expectation, there were no significant differences in population density across localities. Genetic diversity decreased, but not significantly, with decreasing habitat area and population size. We found a higher likelihood of past bottleneck events in the fragmented coastal populations. The low population size and prior decline in diversity in coastal patches are consistent with their isolation, anthropogenic disturbance, and exposure to cyclone activity. The similarities in the estimates of density between continuous and fragmented sites may indicate recent population growth in the fragments but these populations nevertheless remain at risk from reduced levels of genetic variation. These patterns should be confirmed with more extensive sampling across the limited range of E. cinereiceps. © 2011 Fauna & Flora International.
Authors & Co-Authors
Brenneman, Rick A.
United States, Omaha
The Bill and Berniece Grewcock Center for Conservation and Research
Johnson, Steig E.
Canada, Calgary
University of Calgary
Bailey, Carolyn A.
United States, Omaha
The Bill and Berniece Grewcock Center for Conservation and Research
Ingraldi, Christina
Canada, Calgary
University of Calgary
Delmore, Kira E.
Canada, Calgary
University of Calgary
Wyman, Tracy M.
Canada, Calgary
University of Calgary
Andriamaharoa, Hubert E.
Madagascar, Antananarivo
Missouri Botanical Garden Antananarivo
Ralainasolo, Fidimalala Bruno
United Kingdom, Jersey
Durrell Wildlife Conservation Trust
Ratsimbazafy, Jonah Henri
United Kingdom, Jersey
Durrell Wildlife Conservation Trust
Louis, Edward E.
United States, Omaha
The Bill and Berniece Grewcock Center for Conservation and Research
Statistics
Citations: 21
Authors: 10
Affiliations: 4
Identifiers
Doi:
10.1017/S0030605311000159
ISSN:
00306053
e-ISSN:
13653008
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study
Study Locations
Madagascar