Murray, C.S. orcid.org/0000-0002-8302-6585, Karram, M. orcid.org/0009-0001-4331-8292, Bass, D.J. orcid.org/0000-0001-7414-2747 et al. (5 more authors) (2025) Trans‐specific polymorphisms between cryptic Daphnia species affect fitness and behavior. Molecular Ecology, 34 (3). e17632. ISSN 0962-1083
Abstract
Shared polymorphisms, loci with identical alleles across species, are of unique interest in evolutionary biology as they may represent cases of selection maintaining ancient genetic variation post‐speciation, or contemporary selection promoting convergent evolution. In this study, we investigate the abundance of shared polymorphism between two members of the <jats:styled-content style="fixed-case"><jats:italic>Daphnia pulex</jats:italic></jats:styled-content> species complex. We test whether the presence of shared mutations is consistent with the action of balancing selection or alternative hypotheses such as hybridization, incomplete lineage sorting or convergent evolution. We analyzed over 2,000 genomes from six taxa in the <jats:styled-content style="fixed-case"><jats:italic>D. pulex</jats:italic></jats:styled-content> species group and examined the prevalence and distribution of shared alleles between the focal species pair, North American and European <jats:styled-content style="fixed-case"><jats:italic>D. pulex</jats:italic></jats:styled-content>. We show that North American and European <jats:styled-content style="fixed-case"><jats:italic>D. pulex</jats:italic></jats:styled-content> diverged over 10 million years ago, yet retained tens of thousands of shared polymorphisms. We suggest that the number of shared polymorphisms between North American and European <jats:styled-content style="fixed-case"><jats:italic>D. pulex</jats:italic></jats:styled-content> cannot be fully explained by hybridization or incomplete lineage sorting alone. We show that most shared polymorphisms could be the product of convergent evolution, that a limited number appear to be old trans‐specific polymorphisms, and that balancing selection is affecting convergent and ancient mutations alike. Finally, we provide evidence that a blue wavelength opsin gene with trans‐specific polymorphisms has functional effects on behavior and fitness in the wild.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Author(s). Molecular Ecology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited: https://creativecommons.org/licenses/by/4.0/ |
Keywords: | balancing selection; convergent evolution; Daphnia; hybridization; opsins; shared polymorphism |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Biosciences (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 10 Jan 2025 11:18 |
Last Modified: | 12 Mar 2025 16:21 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1111/mec.17632 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:221274 |