期刊
ECOLOGY AND EVOLUTION
卷 5, 期 15, 页码 3031-3045出版社
WILEY
DOI: 10.1002/ece3.1583
关键词
Ecological segregation; hybridization; microsatellites; Salvelinus; sympatric populations
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) operating and equipment grants
- Northern Scientific Training Program (NSTP) research grant from Canadian Polar Commission
- Canadian Graduate Scholarship (CGS-M) from NSERC
Understanding the extent of interspecific hybridization and how ecological segregation may influence hybridization requires comprehensively sampling different habitats over a range of life history stages. Arctic char (Salvelinus alpinus) and Dolly Varden (S.malma) are recently diverged salmonid fishes that come into contact in several areas of the North Pacific where they occasionally hybridize. To better quantify the degree of hybridization and ecological segregation between these taxa, we sampled over 700 fish from multiple lake (littoral and profundal) and stream sites in two large, interconnected southwestern Alaskan lakes. Individuals were genotyped at 12 microsatellite markers, and genetic admixture (Q) values generated through Bayesian-based clustering revealed hybridization levels generally lower than reported in a previous study (<0.6% to 5% of samples classified as late-generation hybrids). Dolly Varden and Arctic char tended to make different use of stream habitats with the latter apparently abandoning streams for lake habitats after 2-3years of age. Our results support the distinct biological species status of Dolly Varden and Arctic char and suggest that ecological segregation may be an important factor limiting opportunities for hybridization and/or the ecological performance of hybrid char.
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