Chromosome Polymorphisms Track Trans-Atlantic Divergence and Secondary Contact in Atlantic Salmon
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 glac...
Published in: | Molecular Ecology |
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ftsouthmissispun:oai:aquila.usm.edu:fac_pubs-17789 2023-07-30T04:02:22+02:00 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. 2019-03-02T08:00:00Z https://aquila.usm.edu/fac_pubs/16478 https://doi.org/10.1111/mec.15065 unknown The Aquila Digital Community https://aquila.usm.edu/fac_pubs/16478 https://doi.org/10.1111/mec.15065 Faculty Publications atlantic salmon chromosome rearrangements hybridization secondary contact selection Ecology and Evolutionary Biology Life Sciences text 2019 ftsouthmissispun https://doi.org/10.1111/mec.15065 2023-07-15T18:52:45Z 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. Text Atlantic salmon Salmo salar The University of Southern Mississippi: The Aquila Digital Community Molecular Ecology 28 8 2074 2087 |
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Open Polar |
collection |
The University of Southern Mississippi: The Aquila Digital Community |
op_collection_id |
ftsouthmissispun |
language |
unknown |
topic |
atlantic salmon chromosome rearrangements hybridization secondary contact selection Ecology and Evolutionary Biology Life Sciences |
spellingShingle |
atlantic salmon chromosome rearrangements hybridization secondary contact selection Ecology and Evolutionary Biology Life Sciences 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 |
topic_facet |
atlantic salmon chromosome rearrangements hybridization secondary contact selection Ecology and Evolutionary Biology Life Sciences |
description |
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. |
format |
Text |
author |
Lehnert, Sarah J. Bentzen, Paul Kess, Tony Lien, Sigbjørn Horne, John B. Clément, Marie Bradbury, Ian R. |
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 |
The Aquila Digital Community |
publishDate |
2019 |
url |
https://aquila.usm.edu/fac_pubs/16478 https://doi.org/10.1111/mec.15065 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Faculty Publications |
op_relation |
https://aquila.usm.edu/fac_pubs/16478 https://doi.org/10.1111/mec.15065 |
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_ |
1772813163992973312 |