Characterizing dispersal patterns in a threatened seabird with limited genetic structure

摘要: Genetic assignment methods provide an appealing approach for characterizing dispersal patterns on ecological time scales, but require sufficient genetic differentiation to accurately identify migrants and a large enough sample size of to, example, compare between sexes or age classes. We demonstrate that can be rigorously used characterize in marbled murrelet (Brachyramphus marmoratus) population from central California numbers approximately 600 individuals is only moderately differentiated (F(ST)similar 0.03) larger populations the north. coalescent simulations select significance level resulted low equal expected number type I II errors then this origin 589 genotyped at 13 microsatellite loci. The proportion was greatest during winter when 83% were classified as compared lower proportions breeding (6%) post-breeding (8%) seasons. Dispersal also biased toward young female individuals, typical birds. Migrants rarely members parent-offspring pairs, suggesting they contributed few population. A greater than under equilibrium conditions, lack with mixed ancestry, small potential source (two), likely allowed us use less typically thought required identification migrants.