Genomic signatures of local directional selection in a high gene flow marine organism; the Atlantic cod (Gadus morhua).

BMC Evolutionary Biology
Einar E NielsenG R Carvalho

Abstract

Marine fishes have been shown to display low levels of genetic structuring and associated high levels of gene flow, suggesting shallow evolutionary trajectories and, possibly, limited or lacking adaptive divergence among local populations. We investigated variation in 98 gene-associated single nucleotide polymorphisms (SNPs) for evidence of selection in local populations of Atlantic cod (Gadus morhua L.) across the species distribution. Our global genome scan analysis identified eight outlier gene loci with very high statistical support, likely to be subject to directional selection in local demes, or closely linked to loci under selection. Likewise, on a regional south/north transect of central and eastern Atlantic populations, seven loci displayed strongly elevated levels of genetic differentiation. Selection patterns among populations appeared to be relatively widespread and complex, i.e. outlier loci were generally not only associated with one of a few divergent local populations. Even on a limited geographical scale between the proximate North Sea and Baltic Sea populations four loci displayed evidence of adaptive evolution. Temporal genome scan analysis applied to DNA from archived otoliths from a Faeroese population demo...Continue Reading

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Citations

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Datasets Mentioned

BETA
FJ666984
GU063866
AJ609233
AF385832

Methods Mentioned

BETA
MDS
generate
a
PCR

Software Mentioned

GENEPOP
ARLEQUIN
SAM
Vista
Optimal
BAYESCAN
FDIST2

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