Data from: Parallel and nonparallel genome-wide divergence among replicate population pairs of freshwater and anadromous Atlantic salmon ...

• Main Authors: Perrier, Charles, Bourret, Vincent, Kent, Matthew P., Bernatchez, Louis
• Format: Dataset
• Language: English
• Published: Dryad 2017
• Subjects: Salmo salar; Canada; Atlantic salmon
• Online Access: https://dx.doi.org/10.5061/dryad.7163d; https://datadryad.org/stash/dataset/doi:10.5061/dryad.7163d

Little is known about the genetic basis differentiating resident and anadromous forms found in many salmonid species. Using a medium-density SNP array, we documented genomic diversity and divergence at 2336 genetically mapped loci among three pairs of North American anadromous and freshwater Atlantic salmon populations. Our results show that across the genome, freshwater populations have lower diversity and a smaller proportion of private polymorphism relative to anadromous populations. Moreover, differentiation was more pronounced among freshwater than among anadromous populations at multiple spatial scales, suggesting a large effect of genetic drift in these isolated freshwater populations. Using nonhierarchical and hierarchical genome scans, we identified hundreds of markers spread across the genome that are potentially under divergent selection between anadromous and freshwater populations, but few outlier loci were repeatedly found in all three freshwater–anadromous comparisons. Similarly, a sliding ... : 203individuals_2716SNPsContains the genotypes of the 203 Atlantic salmon individuals from Québec, Canada, analysed in this study at 2716 SNPs. ...