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...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:45055 2023-05-15T15:27:19+02:00 A genomic island linked to ecotype divergence in Atlantic cod Hemmer-hansen, Jakob Nielsen, Einar E. Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. 2013-05-01 https://ueaeprints.uea.ac.uk/id/eprint/45055/ https://doi.org/10.1111/mec.2013.22.issue-10 unknown Hemmer-hansen, Jakob, Nielsen, Einar E., Therkildsen, Nina O., Taylor, Martin I., Ogden, Rob, Geffen, Audrey J., Bekkevold, Dorte, Helyar, Sarah, Pampoulie, Christophe, Johansen, Torild and Carvalho, Gary R. (2013) A genomic island linked to ecotype divergence in Atlantic cod. Molecular Ecology, 22 (10). pp. 2653-2667. ISSN 0962-1083 doi:10.1111/mec.2013.22.issue-10 Article PeerReviewed 2013 ftuniveastangl https://doi.org/10.1111/mec.2013.22.issue-10 2023-01-30T21:36:41Z 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 University of East Anglia: UEA Digital Repository Molecular Ecology 22 10 |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
language |
unknown |
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 |
Hemmer-hansen, Jakob Nielsen, Einar E. Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. |
spellingShingle |
Hemmer-hansen, Jakob Nielsen, Einar E. 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 |
author_facet |
Hemmer-hansen, Jakob Nielsen, Einar E. Therkildsen, Nina O. Taylor, Martin I. Ogden, Rob Geffen, Audrey J. Bekkevold, Dorte Helyar, Sarah Pampoulie, Christophe Johansen, Torild Carvalho, Gary R. |
author_sort |
Hemmer-hansen, Jakob |
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://ueaeprints.uea.ac.uk/id/eprint/45055/ https://doi.org/10.1111/mec.2013.22.issue-10 |
genre |
atlantic cod |
genre_facet |
atlantic cod |
op_relation |
Hemmer-hansen, Jakob, Nielsen, Einar E., Therkildsen, Nina O., Taylor, Martin I., Ogden, Rob, Geffen, Audrey J., Bekkevold, Dorte, Helyar, Sarah, Pampoulie, Christophe, Johansen, Torild and Carvalho, Gary R. (2013) A genomic island linked to ecotype divergence in Atlantic cod. Molecular Ecology, 22 (10). pp. 2653-2667. ISSN 0962-1083 doi:10.1111/mec.2013.22.issue-10 |
op_doi |
https://doi.org/10.1111/mec.2013.22.issue-10 |
container_title |
Molecular Ecology |
container_volume |
22 |
container_issue |
10 |
_version_ |
1766357762141323264 |