Data from: Population size, habitat fragmentation, and the nature of adaptive variation in a stream fish ...

• Main Authors: Fraser, Dylan J., Debes, Paul V., Bernatchez, Louis, Hutchings, Jeffrey A.
• Format: Dataset
• Language: English
• Published: Dryad 2014
• Subjects: Salvelinus fontinalis; Population size; habitat fragmentation; Newfoundland
• Online Access: https://dx.doi.org/10.5061/dryad.6t794; https://datadryad.org/stash/dataset/doi:10.5061/dryad.6t794

Whether and how habitat fragmentation and population size jointly affect adaptive genetic variation and adaptive population differentiation are largely unexplored. Owing to pronounced genetic drift, small, fragmented populations are thought to exhibit reduced adaptive genetic variation relative to large populations. Yet fragmentation is known to increase variability within and among habitats as population size decreases. Such variability might instead favour the maintenance of adaptive polymorphisms and/or generate more variability in adaptive differentiation at smaller population size. We investigated these alternative hypotheses by analysing coding-gene, single-nucleotide polymorphisms associated with different biological functions in fragmented brook trout populations of variable sizes. Putative adaptive differentiation was greater between small and large populations or among small populations than among large populations. These trends were stronger for genetic population size measures than demographic ... : Cape Race_final SNP dataSNP data for 446 individuals from 14 brook trout populations originating from Cape Race, Newfoundland, Canada ...