期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 75, 期 7, 页码 1160-1168出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2017-0116
关键词
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资金
- U.S. Department of Agriculture National Animal Genome Research Program
- H. Mason Keeler Endowment for Excellence
- U.S. National Science Foundation Graduate Research Fellowship [DGE-0718124]
Natural-origin steelhead trout (Oncorhynchus mykiss (Walbaum, 1792)) in the Pacific Northwest, USA, are threatened by a number of factors including habitat destruction, disease, decline in marine survival, and a potential erosion of genetic viability due to introgression from hatchery strains. Our major goal was to use a recently developed SNP array containing similar to 57 000 SNPs to identify a subset of SNPs that differentiate hatchery and natural-origin populations. We analyzed 35 765 polymorphic SNPs in nine populations of steelhead trout sampled from Puget Sound, Washington, USA. We then conducted two outlier tests and found 360 loci that were candidates for divergent selection between hatchery and natural-origin populations (mean F-CT = 0.29, maximum = 0.65) and 595 SNPs that were candidates for selection among natural-origin populations (mean F-ST = 0.25, maximum = 0.51). Comparisons with a linkage map revealed that two chromosomes (Omy05 and Omy25) contained significantly more outliers than other chromosomes, suggesting that regions on Omy05 and Omy25 may be of adaptive significance. Our results highlight several advantages of the 57 000 SNP array as a tool for population and conservation genomics studies.
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