期刊
ECOLOGY AND EVOLUTION
卷 3, 期 7, 页码 2362-2377出版社
WILEY
DOI: 10.1002/ece3.628
关键词
Chum salmon; isolation-by-distance; landscape genetics; microsatellite; population genetics; SNP
资金
- Rasmuson Foundation
- University of Alaska Experimental Program
- U. S. National Oceanic and Atmospheric Administration Alaska Fisheries Science Center
- Arctic-Yukon-Kuskokwim Sustainable Salmon Initiative
- HPC resources from the Arctic Region Supercomputing Center
- University of Alaska Fairbanks
- School of Fisheries
- Ocean Sciences
Low genetic divergence at neutral loci among populations is often the result of high levels of contemporary gene flow. Western Alaskan summer-run chum salmon (Oncorhynchus keta) populations demonstrate weak genetic structure, but invoking contemporary gene flow as the basis for the low divergence is problematic because salmon home to their natal streams and some of the populations are thousands of kilometers apart. We used genotypes from microsatellite and single nucleotide polymorphism loci to investigate alternative explanations for the current genetic structure of chum salmon populations from western Alaska. We also estimated current levels of gene flow among Kuskokwim River populations. Our results suggest that weak genetic structure is best explained by physical connections that occurred after the Holocene Thermal Maximum among the Yukon, Kuskokwim, and Nushagak drainages that allowed gene flow to occur among now distant populations.
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