A genomic island linked to ecotype divergence in Atlantic cod
The genomic architecture underlying ecological divergence and ecological speciation with gene flow is still largely unknown for most organisms. One central question is whether divergence is genome‐wide or localized in ‘genomic mosaics’ during early stages when gene flow is still pronounced. Empirica...
Published in: | Molecular Ecology |
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2013
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Online Access: | https://orbit.dtu.dk/en/publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed https://doi.org/10.1111/mec.12284 https://backend.orbit.dtu.dk/ws/files/54453906/Hemmer_Hansen_et_al_Submitted.pdf http://onlinelibrary.wiley.com/doi/10.1111/mec.12284/full |
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ftdtupubl:oai:pure.atira.dk:publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed 2024-06-23T07:51:04+00:00 A genomic island linked to ecotype divergence in Atlantic cod Hansen, Jakob Hemmer Eg Nielsen, Einar Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. 2013 application/pdf https://orbit.dtu.dk/en/publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed https://doi.org/10.1111/mec.12284 https://backend.orbit.dtu.dk/ws/files/54453906/Hemmer_Hansen_et_al_Submitted.pdf http://onlinelibrary.wiley.com/doi/10.1111/mec.12284/full eng eng https://orbit.dtu.dk/en/publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed info:eu-repo/semantics/closedAccess Hansen , J H , Eg Nielsen , E , Therkildsen , N O , Taylor , M I , Ogden , R , Geffen , A J , Bekkevold , D , Helyar , S , Pampoulie , C , Johansen , T & Carvalho , G R 2013 , ' A genomic island linked to ecotype divergence in Atlantic cod ' , Molecular Ecology , vol. 22 , no. 10 , pp. 2653-2667 . https://doi.org/10.1111/mec.12284 /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2013 ftdtupubl https://doi.org/10.1111/mec.12284 2024-06-04T15:02:04Z The genomic architecture underlying ecological divergence and ecological speciation with gene flow is still largely unknown for most organisms. One central question is whether divergence is genome‐wide or localized in ‘genomic mosaics’ during early stages when gene flow is still pronounced. Empirical work has so far been limited, and the relative impacts of gene flow and natural selection on genomic patterns have not been fully explored. Here, we use ecotypes of Atlantic cod to investigate genomic patterns of diversity and population differentiation in a natural system characterized by high gene flow and large effective population sizes, properties which theoretically could restrict divergence in local genomic regions. We identify a genomic region of strong population differentiation, extending over approximately 20 cM, between pairs of migratory and stationary ecotypes examined at two different localities. Furthermore, the region is characterized by markedly reduced levels of genetic diversity in migratory ecotype samples. The results highlight the genomic region, or ‘genomic island’, as potentially associated with ecological divergence and suggest the involvement of a selective sweep. Finally, we also confirm earlier findings of localized genomic differentiation in three other linkage groups associated with divergence among eastern Atlantic populations. Thus, although the underlying mechanisms are still unknown, the results suggest that ‘genomic mosaics’ of differentiation may even be found under high levels of gene flow and that marine fishes may provide insightful model systems for studying and identifying initial targets of selection during ecological divergence. Article in Journal/Newspaper atlantic cod Technical University of Denmark: DTU Orbit Molecular Ecology 22 10 2653 2667 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Hansen, Jakob Hemmer Eg Nielsen, Einar Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. A genomic island linked to ecotype divergence in Atlantic cod |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
The genomic architecture underlying ecological divergence and ecological speciation with gene flow is still largely unknown for most organisms. One central question is whether divergence is genome‐wide or localized in ‘genomic mosaics’ during early stages when gene flow is still pronounced. Empirical work has so far been limited, and the relative impacts of gene flow and natural selection on genomic patterns have not been fully explored. Here, we use ecotypes of Atlantic cod to investigate genomic patterns of diversity and population differentiation in a natural system characterized by high gene flow and large effective population sizes, properties which theoretically could restrict divergence in local genomic regions. We identify a genomic region of strong population differentiation, extending over approximately 20 cM, between pairs of migratory and stationary ecotypes examined at two different localities. Furthermore, the region is characterized by markedly reduced levels of genetic diversity in migratory ecotype samples. The results highlight the genomic region, or ‘genomic island’, as potentially associated with ecological divergence and suggest the involvement of a selective sweep. Finally, we also confirm earlier findings of localized genomic differentiation in three other linkage groups associated with divergence among eastern Atlantic populations. Thus, although the underlying mechanisms are still unknown, the results suggest that ‘genomic mosaics’ of differentiation may even be found under high levels of gene flow and that marine fishes may provide insightful model systems for studying and identifying initial targets of selection during ecological divergence. |
format |
Article in Journal/Newspaper |
author |
Hansen, Jakob Hemmer Eg Nielsen, Einar Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. |
author_facet |
Hansen, Jakob Hemmer Eg Nielsen, Einar Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. |
author_sort |
Hansen, Jakob Hemmer |
title |
A genomic island linked to ecotype divergence in Atlantic cod |
title_short |
A genomic island linked to ecotype divergence in Atlantic cod |
title_full |
A genomic island linked to ecotype divergence in Atlantic cod |
title_fullStr |
A genomic island linked to ecotype divergence in Atlantic cod |
title_full_unstemmed |
A genomic island linked to ecotype divergence in Atlantic cod |
title_sort |
genomic island linked to ecotype divergence in atlantic cod |
publishDate |
2013 |
url |
https://orbit.dtu.dk/en/publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed https://doi.org/10.1111/mec.12284 https://backend.orbit.dtu.dk/ws/files/54453906/Hemmer_Hansen_et_al_Submitted.pdf http://onlinelibrary.wiley.com/doi/10.1111/mec.12284/full |
genre |
atlantic cod |
genre_facet |
atlantic cod |
op_source |
Hansen , J H , Eg Nielsen , E , Therkildsen , N O , Taylor , M I , Ogden , R , Geffen , A J , Bekkevold , D , Helyar , S , Pampoulie , C , Johansen , T & Carvalho , G R 2013 , ' A genomic island linked to ecotype divergence in Atlantic cod ' , Molecular Ecology , vol. 22 , no. 10 , pp. 2653-2667 . https://doi.org/10.1111/mec.12284 |
op_relation |
https://orbit.dtu.dk/en/publications/02011ecd-16b3-4834-96ac-1d2ca45c03ed |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/mec.12284 |
container_title |
Molecular Ecology |
container_volume |
22 |
container_issue |
10 |
container_start_page |
2653 |
op_container_end_page |
2667 |
_version_ |
1802642062239072256 |