Widespread gene flow and high genetic variability in populations of water voles Arvicola terrestris in patchy habitats

Molecular Ecology
Jon AarsXavier Lambin

Abstract

Theory predicts that the impact of gene flow on the genetic structure of populations in patchy habitats depends on its scale and the demographic attributes of demes (e.g. local colony sizes and timing of reproduction), but empirical evidence is scarce. We inferred the impact of gene flow on genetic structure among populations of water voles Arvicola terrestris that differed in average colony sizes, population turnover and degree of patchiness. Colonies typically consisted of few reproducing adults and several juveniles. Twelve polymorphic microsatellite DNA loci were examined. Levels of individual genetic variability in all areas were high (H(O) = 0.69-0.78). Assignments of juveniles to parents revealed frequent dispersal over long distances. The populations showed negative F(IS) values among juveniles, F(IS) values around zero among adults, high F(ST) values among colonies for juveniles, and moderate, often insignificant, F(ST) values for parents. We inferred that excess heterozygosity within colonies reflected the few individuals dispersing from a large area to form discrete breeding colonies. Thus pre-breeding dispersal followed by rapid reproduction results in a seasonal increase in differentiation due to local family group...Continue Reading

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Citations

Jun 15, 2007·Molecular Ecology·Manuel SchweizerGerald Heckel
Jan 15, 2009·Molecular Ecology·B GauffreJ F Cosson
Sep 3, 2011·Molecular Ecology·T H Clutton-Brock, D Lukas
Mar 25, 2011·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Paola L SassiCristina N Gardenal
Feb 20, 2013·Molecular Ecology·Anna M SchmidtJudith Korb
Jan 4, 2012·Molecular Ecology·Jean-François Le GalliardXavier Lambin
Nov 19, 2013·Ecology Letters·Karine BerthierXavier Lambin
Jan 22, 2017·G3 : Genes - Genomes - Genetics·Takahiro Maruki, Michael Lynch

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