Genetic and Behavioral Evidence for Restricted Gene Flow among Coastal Cutthroat Trout Populations

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Abstract
Using a genetic and tag–recapture study, we assessed the geographic scale of population structuring and dynamics of gene flow in collections of coastal cutthroat trout Oncorhynchus clarki clarki in Washington State. Tests for genotypic differentiation at 10 microsatellite loci were significant for all pairwise comparisons among 10 collections from Hood Canal creeks separated by about 2–100 km. Similarly, F-statistic analogues indicated that low but significant population structure existed among the nine anadromous collections (ϑST = 0.030, ρST = 0.029). Results from tests for isolation by distance revealed significant correlation between genetic and geographic distances. Previously published genetic data at six common loci from 14 coastal cutthroat trout collections across Washington were incorporated for some additional analyses. When analyzing all 22 anadromous collections at the six common loci, estimates of population structure increased to 0.088 for ϑST and 0.081 for ρST. All collections wer...

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