Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation
Abstract Disentangling evolutionary forces that may interact to determine the patterns of genetic differentiation within and among wild populations is a major challenge in evolutionary biology. The objective of this study was to assess the genetic structure and the potential influence of several eco...
Published in: | Molecular Ecology |
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crwiley:10.1111/j.1365-294x.2008.03771.x 2024-06-02T08:03:30+00:00 Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation DIONNE, MÉLANIE CARON, FRANÇOIS DODSON, JULIAN J. BERNATCHEZ, LOUIS 2008 http://dx.doi.org/10.1111/j.1365-294x.2008.03771.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2008.03771.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2008.03771.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 17, issue 10, page 2382-2396 ISSN 0962-1083 1365-294X journal-article 2008 crwiley https://doi.org/10.1111/j.1365-294x.2008.03771.x 2024-05-03T11:58:51Z Abstract Disentangling evolutionary forces that may interact to determine the patterns of genetic differentiation within and among wild populations is a major challenge in evolutionary biology. The objective of this study was to assess the genetic structure and the potential influence of several ecological variables on the extent of genetic differentiation at multiple spatial scales in a widely distributed species, the Atlantic salmon, Salmo salar . A total of 2775 anadromous fish were sampled from 51 rivers along the North American Atlantic coast and were genotyped using 13 microsatellites. A Bayesian analysis clustered these populations into seven genetically and geographically distinct groups, characterized by different environmental and ecological factors, mainly temperature. These groups were also characterized by different extent of genetic differentiation among populations. Dispersal was relatively high and of the same magnitude within compared to among regional groups, which contrasted with the maintenance of a regional genetic structure. However, genetic differentiation was lower among populations exchanging similar rates of local as opposed to inter‐regional migrants, over the same geographical scale. This raised the hypothesis that gene flow could be constrained by local adaptation at the regional scale. Both coastal distance and temperature regime were found to influence the observed genetic structure according to landscape genetic analyses. The influence of other factors such as latitude, river length and altitude, migration tactic, and stocking was not significant at any spatial scale. Overall, these results suggested that the interaction between gene flow and thermal regime adaptation mainly explained the hierarchical genetic structure observed among Atlantic salmon populations. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Molecular Ecology 17 10 2382 2396 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Disentangling evolutionary forces that may interact to determine the patterns of genetic differentiation within and among wild populations is a major challenge in evolutionary biology. The objective of this study was to assess the genetic structure and the potential influence of several ecological variables on the extent of genetic differentiation at multiple spatial scales in a widely distributed species, the Atlantic salmon, Salmo salar . A total of 2775 anadromous fish were sampled from 51 rivers along the North American Atlantic coast and were genotyped using 13 microsatellites. A Bayesian analysis clustered these populations into seven genetically and geographically distinct groups, characterized by different environmental and ecological factors, mainly temperature. These groups were also characterized by different extent of genetic differentiation among populations. Dispersal was relatively high and of the same magnitude within compared to among regional groups, which contrasted with the maintenance of a regional genetic structure. However, genetic differentiation was lower among populations exchanging similar rates of local as opposed to inter‐regional migrants, over the same geographical scale. This raised the hypothesis that gene flow could be constrained by local adaptation at the regional scale. Both coastal distance and temperature regime were found to influence the observed genetic structure according to landscape genetic analyses. The influence of other factors such as latitude, river length and altitude, migration tactic, and stocking was not significant at any spatial scale. Overall, these results suggested that the interaction between gene flow and thermal regime adaptation mainly explained the hierarchical genetic structure observed among Atlantic salmon populations. |
format |
Article in Journal/Newspaper |
author |
DIONNE, MÉLANIE CARON, FRANÇOIS DODSON, JULIAN J. BERNATCHEZ, LOUIS |
spellingShingle |
DIONNE, MÉLANIE CARON, FRANÇOIS DODSON, JULIAN J. BERNATCHEZ, LOUIS Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
author_facet |
DIONNE, MÉLANIE CARON, FRANÇOIS DODSON, JULIAN J. BERNATCHEZ, LOUIS |
author_sort |
DIONNE, MÉLANIE |
title |
Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
title_short |
Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
title_full |
Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
title_fullStr |
Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
title_full_unstemmed |
Landscape genetics and hierarchical genetic structure in Atlantic salmon: the interaction of gene flow and local adaptation |
title_sort |
landscape genetics and hierarchical genetic structure in atlantic salmon: the interaction of gene flow and local adaptation |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1365-294x.2008.03771.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2008.03771.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2008.03771.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Molecular Ecology volume 17, issue 10, page 2382-2396 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-294x.2008.03771.x |
container_title |
Molecular Ecology |
container_volume |
17 |
container_issue |
10 |
container_start_page |
2382 |
op_container_end_page |
2396 |
_version_ |
1800748032082313216 |