Genomic signatures and correlates of widespread population declines in salmon.

Autor: Lehnert SJ; Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, 80 E White Hills Rd, St. John's, Newfoundland, A1C 5X1, Canada. sarah.lehnert@dfo-mpo.gc.ca., Kess T; Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, 80 E White Hills Rd, St. John's, Newfoundland, A1C 5X1, Canada., Bentzen P; Biology Department, Dalhousie University, 6050 University Avenue, Halifax, NS, B3H 4R2, Canada., Kent MP; Centre for Integrative Genetics (CIGENE), Department of Animal and Aquacultural Sciences, Faculty of Biosciences, Norwegian University of Life Sciences, Ås, 1430, Norway., Lien S; Centre for Integrative Genetics (CIGENE), Department of Animal and Aquacultural Sciences, Faculty of Biosciences, Norwegian University of Life Sciences, Ås, 1430, Norway., Gilbey J; Marine Scotland Science, Freshwater Fisheries Laboratory, Faskally, Pitlochry, PH16 5LB, UK., Clément M; Centre for Fisheries Ecosystems Research, Fisheries and Marine Institute of Memorial University of Newfoundland, 155 Ridge Rd, St. John's, NL, A1C 5R3, Canada.; Labrador Institute, Memorial University of Newfoundland, 219 Hamilton River Rd, Happy Valley-Goose Bay, NL, A0P 1E0, Canada., Jeffery NW; Fisheries and Oceans Canada, Bedford Institute of Oceanography, 1 Challenger Dr, Dartmouth, NS, B2Y 4A2, Canada., Waples RS; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA., Bradbury IR; Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, 80 E White Hills Rd, St. John's, Newfoundland, A1C 5X1, Canada.; Biology Department, Dalhousie University, 6050 University Avenue, Halifax, NS, B3H 4R2, Canada.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2019 Jul 05; Vol. 10 (1), pp. 2996. Date of Electronic Publication: 2019 Jul 05.
DOI: 10.1038/s41467-019-10972-w
Abstrakt: Global losses of biodiversity are occurring at an unprecedented rate, but causes are often unidentified. Genomic data provide an opportunity to isolate drivers of change and even predict future vulnerabilities. Atlantic salmon (Salmo salar) populations have declined range-wide, but factors responsible are poorly understood. Here, we reconstruct changes in effective population size (N e ) in recent decades for 172 range-wide populations using a linkage-based method. Across the North Atlantic, N e has significantly declined in >60% of populations and declines are consistently temperature-associated. We identify significant polygenic associations with decline, involving genomic regions related to metabolic, developmental, and physiological processes. These regions exhibit changes in presumably adaptive diversity in declining populations consistent with contemporary shifts in body size and phenology. Genomic signatures of widespread population decline and associated risk scores allow direct and potentially predictive links between population fitness and genotype, highlighting the power of genomic resources to assess population vulnerability.
Databáze: MEDLINE
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