Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation

Molecular Ecology
Mélanie DionneLouis Bernatchez

Abstract

Disentangling evolutionary forces that may interact to determine the patterns of genetic differentiation within and among wild populations is a major challenge in evolutionary biology. The objective of this study was to assess the genetic structure and the potential influence of several ecological variables on the extent of genetic differentiation at multiple spatial scales in a widely distributed species, the Atlantic salmon, Salmo salar. A total of 2775 anadromous fish were sampled from 51 rivers along the North American Atlantic coast and were genotyped using 13 microsatellites. A Bayesian analysis clustered these populations into seven genetically and geographically distinct groups, characterized by different environmental and ecological factors, mainly temperature. These groups were also characterized by different extent of genetic differentiation among populations. Dispersal was relatively high and of the same magnitude within compared to among regional groups, which contrasted with the maintenance of a regional genetic structure. However, genetic differentiation was lower among populations exchanging similar rates of local as opposed to inter-regional migrants, over the same geographical scale. This raised the hypothesis...Continue Reading

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Citations

Oct 23, 2012·The Journal of Heredity·Melody PorlierAnne Charmantier
Aug 30, 2008·Proceedings. Biological Sciences·Lasse Fast JensenVolker Loeschcke
May 6, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Mélody PorlierDany Garant
May 6, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Mélanie DionneLouis Bernatchez
Mar 24, 2009·Molecular Ecology·Julie A Lee-YawDavid M Green
Jan 15, 2009·Molecular Ecology·B GauffreJ F Cosson
Jan 15, 2009·Molecular Ecology·Loren RiesebergNolan Kane
Jun 3, 2011·Molecular Ecology·Arne W Nolte
Nov 11, 2011·Journal of Evolutionary Biology·A N DreissAlexandre Roulin
Oct 1, 2010·Molecular Ecology·Shawn R NarumKevin A Meyer
Aug 21, 2010·Molecular Ecology·Andrew StorferLisette P Waits
May 5, 2012·Molecular Ecology·Rike B StelkensClaus Wedekind

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