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Genetic structure within and between island populations of the flightless cormorant (Phalacrocorax harrisi)
Caroline V Duffie1, Travis C Glenn, F Hernan Vargas
1Department of Biology R223, University of Missouri-St Louis, St Louis, MO 63121-4499, USA. caroline.duffie@gmail.com
Abstract:
We assessed colony- and island-level genetic differentiation for the flightless cormorant (Phalacrocorax harrisi), an endangered Galápagos endemic that has one of the most limited geographical distributions of any seabird, consisting of only two adjacent islands. We screened 223 individuals from both islands and nine colonies at five microsatellite loci, recovering 23 alleles. We found highly significant genetic differentiation throughout the flightless cormorant's range on Fernandina and Isabela Islands (global F(ST) = 0.097; P < 0.0003) both between islands (supported by Bayesian analyses, F(ST) and R(ST) values) and within islands (supported only by F(ST) and R(ST) values). An overall pattern of isolation-by-distance was evident throughout the sampled range (r = 0.4169, one-sided P
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