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

Dylan J. Fraser, Paul V. Debes, Louis Bernatchez & Jeffrey A. Hutchings
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...
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