Dec 1, 2016

Detecting polygenic selection in marine populations by combining population genomics and quantitative genetics approaches

Current Zoology
Pierre-Alexandre Gagnaire, Oscar E Gaggiotti

Abstract

Highly fecund marine species with dispersive life-history stages often display large population sizes and wide geographic distribution ranges. Consequently, they are expected to experience reduced genetic drift, efficient selection fueled by frequent adaptive mutations, and high migration loads. This has important consequences for understanding how local adaptation proceeds in the sea. A key issue in this regard, relates to the genetic architecture underlying fitness traits. Theory predicts that adaptation may involve many genes but with a high variance in effect size. Therefore, the effect of selection on allele frequencies may be substantial for the largest effect size loci, but insignificant for small effect genes. In such a context, the performance of population genomic methods to unravel the genetic basis of adaptation depends on the fraction of adaptive genetic variance explained by the cumulative effect of outlier loci. Here, we address some methodological challenges associated with the detection of local adaptation using molecular approaches. We provide an overview of genome scan methods to detect selection, including those assuming complex demographic models that better describe spatial population structure. We then fo...Continue Reading

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Mentioned in this Paper

Genetic Drift
Genome-Wide Association Study
Size
Genome
Genes
Genomics
Adaptation
Genome Scan
Local
Species

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