Fragmentation and patch size shape genetic structure of brook trout populations
| Autor: | Keith H. Nislow, Benjamin H. Letcher, Mark Hudy, Jason A. Coombs, Andrew R. Whiteley, Amanda R. Colton, Zachary L. Robinson |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 70:678-688 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/cjfas-2012-0493 |
| Popis: | We tested the relative influence of habitat patch size and connectivity on genetic structure and effective population size in eight brook trout (Salvelinus fontinalis) 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 [Formula: see text] was 0.397 (95% CI: 0.322–0.525) and overall FSTwas 0.124 (95% CI: 0.096–0.159). Above-barrier patch size had a strong positive relationship with genetic diversity, [Formula: see text], 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 [Formula: see text] 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. |
| Databáze: | OpenAIRE |
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