Weak genetic structuring indicates ongoing gene flow across White-ruffed Manakin (<Emphasis Type="Italic">Corapipo altera</Emphasis>) populations in a highly fragmented Costa Rica landscape |
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Authors: | Jacob R Barnett Viviana Ruiz-Gutierrez Aurélie Coulon Irby J Lovette |
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Institution: | (1) Fuller Evolutionary Biology Program, Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA |
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Abstract: | We explored the effects of recent forest fragmentation on fine-scale patterns of population structuring and genetic diversity
in populations of White-ruffed Manakins (Corapipo altera) inhabiting premontane forest fragments of varying size in southwestern Costa Rica. Habitat fragmentation is a major conservation
concern for avian populations worldwide, but studies of the genetic effects of fragmentation on Neotropical birds are limited.
We sampled 159 manakins from nine forest fragments of varying size within an 18 km radius, and genotyped these birds at 13 microsatellite
loci. Bayesian clustering methods revealed that birds from all fragments comprised a single genetic population, and an MCMC
approach showed that the fragments were likely to be at migration-drift equilibrium. F-statistics showed only modest levels
of differentiation between forest fragments. We calculated allelic diversity indices for each fragment but found no correlation
between genetic diversity and fragment size. These results suggest that manakins may retain substantial connectivity via inter-fragment
dispersal despite habitat fragmentation. |
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Keywords: | Bayesian clustering Microsatellites Population connectivity Genetic diversity Habitat fragmentation Neotropical forests |
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