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Genomic stability through time despite decades of exploitation in cod on both sides of the Atlantic [Population Biology]
Proceedings of the National Academy of Sciences of the United States of America ( IF 9.412 ) Pub Date : 2021-04-13 , DOI: 10.1073/pnas.2025453118
Malin L. Pinsky, Anne Maria Eikeset, Cecilia Helmerson, Ian R. Bradbury, Paul Bentzen, Corey Morris, Agata T. Gondek-Wyrozemska, Helle Tessand Baalsrud, Marine Servane Ono Brieuc, Olav Sigurd Kjesbu, Jane A. Godiksen, Julia M. I. Barth, Michael Matschiner, Nils Chr. Stenseth, Kjetill S. Jakobsen, Sissel Jentoft, Bastiaan Star

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.



中文翻译:

尽管大西洋两岸鳕鱼已有数十年的开发历史,但随着时间的流逝,基因组的稳定性[人口生物学]

响应人类收获的快速进化和基因组变化的方式和程度是关键的保护问题。尽管实验和模型显示出对捕捞作出反应的遗传和表型变化的潜力很大,但在野生种群中发生遗传反应的经验例子很少。在这里,我们比较了大西洋鳕(Gadus morhua)的全基因组序列数据。)是在20世纪初期和21世纪初之后的密集开采和成熟年龄迅速下降期间从加拿大纽芬兰和挪威东北北极的两个地理上不同的种群中收集的。我们对346,290个基因座进行的全基因组时间分析显示,遗传多样性没有任何实质性损失,有效种群数量也很高。此外,尽管我们不能排除高度多基因进化的可能性,但我们并未在基因组中的任何地方发现强烈的选择性扫描的明显信号。我们的观察结果表明,这些人群的表型变化不受不可逆转的基因组变异损失的限制,因此暗示可以通过人口统计学的恢复重建以前的性状。

更新日期:2021-04-08
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