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

ABSTRACT:

Background

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.

Results

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 strong

SUBMITTER: Nielsen EE 

PROVIDER: S-EPMC2790465 | biostudies-literature | 2009 Dec

REPOSITORIES: biostudies-literature