Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift
The evolution of diversity in the marine ecosystem is poorly understood, given the relatively high potential for connectivity, especially for highly mobile species such as whales and dolphins. The killer whale (Orcinus orca) has a worldwide distribution, and individual social groups travel over a wi...
Published in: | Molecular Ecology |
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Language: | English |
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2014
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ftsouthampton:oai:eprints.soton.ac.uk:455011 2024-02-11T10:05:30+01:00 Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift Moura, Andre E. Kenny, John G. Chaudhuri, Roy Hughes, Margaret A. J. Welch, Andreanna Reisinger, Ryan R. De Bruyn, P. J.Nico Dahlheim, Marilyn E. Hall, Neil Hoelzel, A. Rus 2014-10-21 https://eprints.soton.ac.uk/455011/ English eng Moura, Andre E., Kenny, John G., Chaudhuri, Roy, Hughes, Margaret A., J. Welch, Andreanna, Reisinger, Ryan R., De Bruyn, P. J.Nico, Dahlheim, Marilyn E., Hall, Neil and Hoelzel, A. Rus (2014) Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift. Molecular Ecology, 23 (21), 5179-5192. (doi:10.1111/mec.12929 <http://dx.doi.org/10.1111/mec.12929>). Article PeerReviewed 2014 ftsouthampton https://doi.org/10.1111/mec.12929 2024-01-25T23:20:31Z The evolution of diversity in the marine ecosystem is poorly understood, given the relatively high potential for connectivity, especially for highly mobile species such as whales and dolphins. The killer whale (Orcinus orca) has a worldwide distribution, and individual social groups travel over a wide geographic range. Even so, regional populations have been shown to be genetically differentiated, including among different foraging specialists (ecotypes) in sympatry. Given the strong matrifocal social structure of this species together with strong resource specializations, understanding the process of differentiation will require an understanding of the relative importance of both genetic drift and local adaptation. Here we provide a high-resolution analysis based on nuclear single-nucleotide polymorphic markers and inference about differentiation at both neutral loci and those potentially under selection. We find that all population comparisons, within or among foraging ecotypes, show significant differentiation, including populations in parapatry and sympatry. Loci putatively under selection show a different pattern of structure compared to neutral loci and are associated with gene ontology terms reflecting physiologically relevant functions (e.g. related to digestion). The pattern of differentiation for one ecotype in the North Pacific suggests local adaptation and shows some fixed differences among sympatric ecotypes. We suggest that differential habitat use and resource specializations have promoted sufficient isolation to allow differential evolution at neutral and functional loci, but that the process is recent and dependent on both selection and drift. Article in Journal/Newspaper Killer Whale Orca Orcinus orca Killer whale University of Southampton: e-Prints Soton Pacific Molecular Ecology 23 21 5179 5192 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
The evolution of diversity in the marine ecosystem is poorly understood, given the relatively high potential for connectivity, especially for highly mobile species such as whales and dolphins. The killer whale (Orcinus orca) has a worldwide distribution, and individual social groups travel over a wide geographic range. Even so, regional populations have been shown to be genetically differentiated, including among different foraging specialists (ecotypes) in sympatry. Given the strong matrifocal social structure of this species together with strong resource specializations, understanding the process of differentiation will require an understanding of the relative importance of both genetic drift and local adaptation. Here we provide a high-resolution analysis based on nuclear single-nucleotide polymorphic markers and inference about differentiation at both neutral loci and those potentially under selection. We find that all population comparisons, within or among foraging ecotypes, show significant differentiation, including populations in parapatry and sympatry. Loci putatively under selection show a different pattern of structure compared to neutral loci and are associated with gene ontology terms reflecting physiologically relevant functions (e.g. related to digestion). The pattern of differentiation for one ecotype in the North Pacific suggests local adaptation and shows some fixed differences among sympatric ecotypes. We suggest that differential habitat use and resource specializations have promoted sufficient isolation to allow differential evolution at neutral and functional loci, but that the process is recent and dependent on both selection and drift. |
format |
Article in Journal/Newspaper |
author |
Moura, Andre E. Kenny, John G. Chaudhuri, Roy Hughes, Margaret A. J. Welch, Andreanna Reisinger, Ryan R. De Bruyn, P. J.Nico Dahlheim, Marilyn E. Hall, Neil Hoelzel, A. Rus |
spellingShingle |
Moura, Andre E. Kenny, John G. Chaudhuri, Roy Hughes, Margaret A. J. Welch, Andreanna Reisinger, Ryan R. De Bruyn, P. J.Nico Dahlheim, Marilyn E. Hall, Neil Hoelzel, A. Rus Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
author_facet |
Moura, Andre E. Kenny, John G. Chaudhuri, Roy Hughes, Margaret A. J. Welch, Andreanna Reisinger, Ryan R. De Bruyn, P. J.Nico Dahlheim, Marilyn E. Hall, Neil Hoelzel, A. Rus |
author_sort |
Moura, Andre E. |
title |
Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
title_short |
Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
title_full |
Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
title_fullStr |
Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
title_full_unstemmed |
Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
title_sort |
population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift |
publishDate |
2014 |
url |
https://eprints.soton.ac.uk/455011/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Killer Whale Orca Orcinus orca Killer whale |
genre_facet |
Killer Whale Orca Orcinus orca Killer whale |
op_relation |
Moura, Andre E., Kenny, John G., Chaudhuri, Roy, Hughes, Margaret A., J. Welch, Andreanna, Reisinger, Ryan R., De Bruyn, P. J.Nico, Dahlheim, Marilyn E., Hall, Neil and Hoelzel, A. Rus (2014) Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift. Molecular Ecology, 23 (21), 5179-5192. (doi:10.1111/mec.12929 <http://dx.doi.org/10.1111/mec.12929>). |
op_doi |
https://doi.org/10.1111/mec.12929 |
container_title |
Molecular Ecology |
container_volume |
23 |
container_issue |
21 |
container_start_page |
5179 |
op_container_end_page |
5192 |
_version_ |
1790602556593930240 |