Journal
JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 20, Issue 5, Pages 1705-1719Publisher
WILEY
DOI: 10.1111/j.1420-9101.2007.01401.x
Keywords
colouration; diversifying selection; ecotypic variation; F-SC; heritability; microsatellites; Q(SC); Q-statistics; scalation
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Populations of the terrestrial garter snake (Thamnophis elegans) around Eagle Lake in California exhibit dramatic ecotypic differentiation in life history, colouration and morphology across distances as small as a few kilometres. We assayed the role of selection in ecotypic differentiation in T. elegans using F-ST-Q(ST) analysis and identified selective agents using direct and indirect observations. We extended the conventional implementation of the F-ST-Q(ST) approach by using three-level analyses of genetic and phenotypic variance to assess the role of selection in differentiating populations both within and between ecotypes. These results suggest that selection has driven differentiation between as well as within ecotypes, and in the presence of moderate to high gene flow. Our findings are discussed in the context of previous correlational selection analyses which revealed stabilizing and correlational selection for some of the traits examined.
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