Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon
Abstract Pleistocene glaciations drove repeated range contractions and expansions shaping contemporary intraspecific diversity. Atlantic salmon ( Salmo salar ) in the western and eastern Atlantic diverged >600,000 years before present, with the two lineages isolated in different southern refugia...
Published in: | Molecular Ecology |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/mec.15065 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmec.15065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.15065 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.15065 |
id |
crwiley:10.1111/mec.15065 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/mec.15065 2024-09-15T17:55:57+00:00 Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon Lehnert, Sarah J. Bentzen, Paul Kess, Tony Lien, Sigbjørn Horne, John B. Clément, Marie Bradbury, Ian R. Natural Sciences and Engineering Research Council of Canada Fisheries and Oceans Canada 2019 http://dx.doi.org/10.1111/mec.15065 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmec.15065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.15065 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.15065 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 28, issue 8, page 2074-2087 ISSN 0962-1083 1365-294X journal-article 2019 crwiley https://doi.org/10.1111/mec.15065 2024-08-22T04:16:24Z Abstract Pleistocene glaciations drove repeated range contractions and expansions shaping contemporary intraspecific diversity. Atlantic salmon ( Salmo salar ) in the western and eastern Atlantic diverged >600,000 years before present, with the two lineages isolated in different southern refugia during glacial maxima, driving trans‐Atlantic genomic and karyotypic divergence. Here, we investigate the genomic consequences of glacial isolation and trans‐Atlantic secondary contact using 108,870 single nucleotide polymorphisms genotyped in 80 North American and European populations. Throughout North America, we identified extensive interindividual variation and discrete linkage blocks within and between chromosomes with known trans‐Atlantic differences in rearrangements: Ssa01/Ssa23 translocation and Ssa08/Ssa29 fusion. Spatial genetic analyses suggest independence of rearrangements, with Ssa01/Ssa23 showing high European introgression (>50%) in northern populations indicative of post‐glacial trans‐Atlantic secondary contact, contrasting with low European ancestry genome‐wide (3%). Ssa08/Ssa29 showed greater intrapopulation diversity, suggesting a derived chromosome fusion polymorphism that evolved within North America. Evidence of potential selection on both genomic regions suggests that the adaptive role of rearrangements warrants further investigation in Atlantic salmon. Our study highlights how Pleistocene glaciations can influence large‐scale intraspecific variation in genomic architecture of northern species. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Molecular Ecology 28 8 2074 2087 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Pleistocene glaciations drove repeated range contractions and expansions shaping contemporary intraspecific diversity. Atlantic salmon ( Salmo salar ) in the western and eastern Atlantic diverged >600,000 years before present, with the two lineages isolated in different southern refugia during glacial maxima, driving trans‐Atlantic genomic and karyotypic divergence. Here, we investigate the genomic consequences of glacial isolation and trans‐Atlantic secondary contact using 108,870 single nucleotide polymorphisms genotyped in 80 North American and European populations. Throughout North America, we identified extensive interindividual variation and discrete linkage blocks within and between chromosomes with known trans‐Atlantic differences in rearrangements: Ssa01/Ssa23 translocation and Ssa08/Ssa29 fusion. Spatial genetic analyses suggest independence of rearrangements, with Ssa01/Ssa23 showing high European introgression (>50%) in northern populations indicative of post‐glacial trans‐Atlantic secondary contact, contrasting with low European ancestry genome‐wide (3%). Ssa08/Ssa29 showed greater intrapopulation diversity, suggesting a derived chromosome fusion polymorphism that evolved within North America. Evidence of potential selection on both genomic regions suggests that the adaptive role of rearrangements warrants further investigation in Atlantic salmon. Our study highlights how Pleistocene glaciations can influence large‐scale intraspecific variation in genomic architecture of northern species. |
author2 |
Natural Sciences and Engineering Research Council of Canada Fisheries and Oceans Canada |
format |
Article in Journal/Newspaper |
author |
Lehnert, Sarah J. Bentzen, Paul Kess, Tony Lien, Sigbjørn Horne, John B. Clément, Marie Bradbury, Ian R. |
spellingShingle |
Lehnert, Sarah J. Bentzen, Paul Kess, Tony Lien, Sigbjørn Horne, John B. Clément, Marie Bradbury, Ian R. Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
author_facet |
Lehnert, Sarah J. Bentzen, Paul Kess, Tony Lien, Sigbjørn Horne, John B. Clément, Marie Bradbury, Ian R. |
author_sort |
Lehnert, Sarah J. |
title |
Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
title_short |
Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
title_full |
Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
title_fullStr |
Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
title_full_unstemmed |
Chromosome polymorphisms track trans‐Atlantic divergence and secondary contact in Atlantic salmon |
title_sort |
chromosome polymorphisms track trans‐atlantic divergence and secondary contact in atlantic salmon |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/mec.15065 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmec.15065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.15065 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.15065 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Molecular Ecology volume 28, issue 8, page 2074-2087 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mec.15065 |
container_title |
Molecular Ecology |
container_volume |
28 |
container_issue |
8 |
container_start_page |
2074 |
op_container_end_page |
2087 |
_version_ |
1810432169669033984 |