Population genetic structure in a self-compatible hermaphroditic snail is driven by drift independently of its contemporary mating system.

Autor: Çetin C; Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.; Institute of Integrative Biology ETH Zurich Zurich Switzerland.; Institute of Environmental Sciences, Faculty of Biology Jagiellonian University Kraków Poland., Jokela J; Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.; Institute of Integrative Biology ETH Zurich Zurich Switzerland., Feulner PGD; Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry EAWAG Swiss Federal Institute of Aquatic Science and Technology Kastanienbaum Switzerland.; Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution University of Bern Bern Switzerland., Schlegel T; Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.; Institute of Integrative Biology ETH Zurich Zurich Switzerland., Tardent N; Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.; Institute of Integrative Biology ETH Zurich Zurich Switzerland., Seppälä O; Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.; Institute of Integrative Biology ETH Zurich Zurich Switzerland.; Research Department for Limnology Universität Innsbruck Mondsee Austria.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2024 Aug 13; Vol. 14 (8), pp. e70162. Date of Electronic Publication: 2024 Aug 13 (Print Publication: 2024).
DOI: 10.1002/ece3.70162
Abstrakt: Genetic drift, gene flow, and natural selection commonly influence population genetic diversity. In populations of self-compatible hermaphrodites, the mating system (e.g., self-fertilization) further reduces individual heterozygosity. Furthermore, selfing, as a form of inbreeding, significantly impacts genetic drift by reducing effective population size ( N e ). This can potentially accelerate genetic drift, particularly in small populations where self-fertilization is likely during founder events. To investigate the roles of genetic drift and contemporary mating system in populations of the freshwater snail Lymnaea stagnalis , we examined their effective population sizes ( N e ) and Tajima's D values, which reflect genetic drift over extended time periods, as well as estimates of within-population selfing rates and pairwise relatedness reflecting contemporary mating system. We used 4054 SNP markers obtained using restriction site associated DNA (RAD) sequencing from individuals in five snail populations originating from geographically closely located ponds. We found strong population genetic structure and differences in genetic diversity among populations. Covariation between genetic diversity and N e estimates and Tajima's D values suggested drift being an important determinant of genetic diversity and structure in these populations. However, this effect was independent of the contemporary mating system, as indicated by the similarity of selfing rates and relatedness estimates among populations. Thus, founder events (possibly including historical inbreeding) and/or drift due to small sizes of L. stagnalis populations are likely to explain their genetic structure and limit within-population genetic diversity.
Competing Interests: The authors declare no conflicts of interest.
(© 2024 The Author(s). Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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