Resumen
Conservation of exploited species requires an understanding of both genetic diversity and the dominant structuring forces, particularly near range limits, where climatic variation can drive rapid expansions or contractions of geographic range. Here, we examine population structure and landscape associations in Atlantic salmon (Salmo salar) across a heterogeneous landscape near the northern range limit in Labrador, Canada. Analysis of two amplicon-based data sets containing 101 microsatellites and 376 single nucleotide polymorphisms (SNPs) from 35 locations revealed clear differentiation between populations spawning in rivers flowing into a large marine embayment (Lake Melville) compared to coastal populations. The mechanisms influencing the differentiation of embayment populations were investigated using both multivariate and machine-learning landscape genetic approaches. We identified temperature as the strongest correlate with genetic structure, particularly warm temperature extremes and wider annual temperature ranges. The genomic basis of this divergence was further explored using a subset of locations (n = 17) and a 220K SNP array. SNPs associated with spatial structuring and temperature mapped to a diverse set of genes and molecular pathways, including regulation of gene expression, immune response, and cell development and differentiation. The results spanning molecular marker types and both novel and established methods clearly show climate-associated, fine-scale population structure across an environmental gradient in Atlantic salmon near its range limit in North America, highlighting valuable approaches for predicting population responses to climate change and managing species sustainability.
Idioma original | English |
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Páginas (desde-hasta) | 4026-4040 |
Número de páginas | 15 |
Publicación | Molecular Ecology |
Volumen | 27 |
N.º | 20 |
DOI | |
Estado | Published - oct. 2018 |
Nota bibliográfica
Funding Information:Natural Sciences and Engineering Research Council of Canada (NSERC) Strategic Grant; Genomics Research and Development Initiative (GRDI) Grant; National Sciences NSERC Discovery Grant and Strategic Project Grant; Atlantic Salmon Federation Olin Fellowship; Torngat Wildlife, Plants, and Fisheries Secretariat; Atlantic Salmon Conservation Foundation; Labrador Institute (Atlantic Canada Opportunities Agency and Department of Tourism, Culture, Industry and Innovation)
Funding Information:
The authors thank the staff of the Newfoundland DFO Salmonids section, Nunatsiavut Government, the Sivunivut Inuit Community Corporation, the Innu Nation, the Labrador Hunting and Fishing Association and local fishers for their support and active participation in this project, as well as Nicholas W. Jeffery for assistance in analysis. We also thank CIGENE, particularly Matthew Kent and Sigbj?rn Lien for access to and assistance with the 220K SNP array. This work was funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Strategic Grant to PB, RGB and MC, as well as a Genomics Research and Development Initiative (GRDI) Grant and a National Sciences and NSERC Discovery Grant and Strategic Project Grant to IRB, the Atlantic Salmon Conservation Foundation, Labrador Institute (Atlantic Canada Opportunities Agency and Department of Tourism, Culture, Industry and Innovation) allocated to the Labrador Institute (MC), and Atlantic Salmon Federation Olin Fellowship and Torngat Wildlife, Plants, and Fisheries Secretariat.
Funding Information:
The authors thank the staff of the Newfoundland DFO Salmonids section, Nunatsiavut Government, the Sivunivut Inuit Community Corporation, the Innu Nation, the Labrador Hunting and Fishing Association and local fishers for their support and active participation in this project, as well as Nicholas W. Jeffery for assistance in analysis. We also thank CIGENE, particularly Matthew Kent and Sig-bjørn Lien for access to and assistance with the 220K SNP array. This work was funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Strategic Grant to PB, RGB and MC, as well as a Genomics Research and Development Initiative (GRDI) Grant and a National Sciences and NSERC Discovery Grant and Strategic Project Grant to IRB, the Atlantic Salmon Conservation Foundation, Labrador Institute (Atlantic Canada Opportunities Agency and Department of Tourism, Culture, Industry and Innovation) allocated to the Labrador Institute (MC), and Atlantic Salmon Federation Olin Fellowship and Torngat Wildlife, Plants, and Fisheries Secretariat.
Publisher Copyright:
© 2018 John Wiley & Sons Ltd
ASJC Scopus Subject Areas
- Ecology, Evolution, Behavior and Systematics
- Genetics