Genomic stability through time despite decades of exploitation in cod on both sides of the Atlantic

Pinsky, Malin L. and Eikeset, Anne Maria and Helmerson, Cecilia and Bradbury, Ian R. and Bentzen, Paul and Morris, Corey and Gondek-Wyrozemska, Agata T. and Baalsrud, Helle Tessand and Brieuc, Marine Servane Ono and Kjesbu, Olav Sigurd and Godiksen, Jane A. and Barth, Julia M. I. and Matschiner, Michael and Stenseth, Nils Chr. and Jakobsen, Kjetill S. and Jentoft, Sissel and Star, Bastiaan. (2021) Genomic stability through time despite decades of exploitation in cod on both sides of the Atlantic. Proceedings of the National Academy of Sciences of the United States of America, 118 (15). e2025453118.

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Official URL: https://edoc.unibas.ch/87687/

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The mode and extent of rapid evolution and genomic change in response to human harvesting are key conservation issues. Although experiments and models have shown a high potential for both genetic and phenotypic change in response to fishing, empirical examples of genetic responses in wild populations are rare. Here, we compare whole-genome sequence data of Atlantic cod ( Gadus morhua ) that were collected before (early 20th century) and after (early 21st century) periods of intensive exploitation and rapid decline in the age of maturation from two geographically distinct populations in Newfoundland, Canada, and the northeast Arctic, Norway. Our temporal, genome-wide analyses of 346,290 loci show no substantial loss of genetic diversity and high effective population sizes. Moreover, we do not find distinct signals of strong selective sweeps anywhere in the genome, although we cannot rule out the possibility of highly polygenic evolution. Our observations suggest that phenotypic change in these populations is not constrained by irreversible loss of genomic variation and thus imply that former traits could be reestablished with demographic recovery.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Evolutionary Biology (Salzburger)
UniBasel Contributors:Barth, Julia
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Feb 2022 09:09
Deposited On:10 Feb 2022 09:09

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