Fragmentation and patch size shape genetic structure of brook trout populations

Andrew R. Whiteley, Jason A. Coombs, Mark Hudy, Zachary Robinson, Amanda R. Colton, Keith H. Nislow, Benjamin H. Letcher

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We tested the relative influence of habitat patch size and connectivity on genetic structure and effective population size in eight brook trout (Salvelinusfontinalis) habitat patches in a watershed in Virginia, USA. Variation at eight microsatellite loci in 2229 young-of-the-year brook trout for two successive cohorts (2010 and 2011) was examined. Genetic differentiation across all populations was pronounced. Overall F'ST was 0.397 (95% CI: 0.322-0.525) and overall FST was 0.124 (95% CI: 0.096-0.159). Above-barrier patch size had a strong positive relationship with genetic diversity, Nb, and genetic differentiation. Our analysis is consistent with greater extinction risk in smaller above-barrier patches. Larger above-barrier patches contained greater genetic diversity but reduced Nb relative to adjacent below-barrier patches. The primary effect of barriers may be to reduce available above-barrier spawning habitat, even for larger above-barrier patches. Below-barrier patches also showed evidence of reduced genetic diversity and lack of connectivity. Genetic monitoring focused at gaining a broader understanding of the relationships here will be necessary to fully evaluate local extinction risks.

    Original languageEnglish
    Pages (from-to)678-688
    Number of pages11
    JournalCanadian Journal of Fisheries and Aquatic Sciences
    Volume70
    Issue number5
    DOIs
    StatePublished - May 2013

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