WESTERN POND TURTLES SPLIT Phillip Q. Spinks, Robert C. - TopicsExpress

WESTERN POND TURTLES SPLIT Phillip Q. Spinks, Robert C. Thomson, and H. Bradley Shaffer The advantages of going large: genome-wide SNPs clarify the complex population history and systematics of the threatened western pond turtle. Molecular Ecology. 23(9): 2228-2241. onlinelibrary.wiley/doi/10.1111/mec.12736/full Abstract: As the field of phylogeography has matured, it has become clear that analyses of one or a few genes may reveal more about the history of those genes than the populations and species that are the targets of study. To alleviate these concerns, the discipline has moved towards larger analyses of more individuals and more genes, although little attention has been paid to the qualitative or quantitative gains that such increases in scale and scope may yield. Here, we increase the number of individuals and markers by an order of magnitude over previously published work to comprehensively assess the phylogeographical history of a well-studied declining species, the western pond turtle (Emys marmorata). We present a new analysis of 89 independent nuclear SNP markers and one mitochondrial gene sequence scored for rangewide sampling of >900 individuals, and compare these to smaller-scale, rangewide genetic and morphological analyses. Our enlarged SNP data fundamentally revise our understanding of evolutionary history for this lineage. Our results indicate that the gains from greatly increasing both the number of markers and individuals are substantial and worth the effort, particularly for species of high conservation concern such as the pond turtle, where accurate assessments of population history are a prerequisite for effective management. CNAH Note: The two subspecies of the western pond turtle (Emys marmorata marmorata and Emys marmorata pallida) are now recognized as species, Emys marmorata and Emys pallida, respectively. Note also that we use Actinemys instead of Emys (per comments in the 12th ed. of the joint society common names list). Common names are tentatively Northern (E. m. marmorata) and Southern Western Pond Turtle (E. m. pallida), respectively.

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