Gametic selection favours polyandry and selfing

Scott, Michael Francis ORCID: https://orcid.org/0000-0002-7182-9946, Mackintosh, Carl and Immler, Simone (2024) Gametic selection favours polyandry and selfing. PLoS Genetics, 20 (2). ISSN 1553-7390

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Abstract

Competition among pollen or sperm (gametic selection) can cause evolution. Mating systems shape the intensity of gametic selection by determining the competitors involved, which can in turn cause the mating system itself to evolve. We model the bidirectional relationship between gametic selection and mating systems, focusing on variation in female mating frequency (monandry-polyandry) and self-fertilisation (selfing-outcrossing). First, we find that monandry and selfing both reduce the efficiency of gametic selection in removing deleterious alleles. This means that selfing can increase mutation load, in contrast to cases without gametic selection where selfing purges deleterious mutations and decreases mutation load. Second, we explore how mating systems evolve via their effect on gametic selection. By manipulating gametic selection, polyandry can evolve to increase the fitness of the offspring produced. However, this indirect advantage of post-copulatory sexual selection is weak and is likely to be overwhelmed by any direct fitness effects of mating systems. Nevertheless, gametic selection can be potentially decisive for selfing evolution because it significantly reduces inbreeding depression, which favours selfing. Thus, the presence of gametic selection could be a key factor driving selfing evolution.

Item Type:	Article
Additional Information:	Data Availability: S1 File is an interactive Mathematica notebook that can be used to replicate our analytical analysis, also provided as a read-only pdf (S2 File). S3 File contains the SLiM v4.0.1 scripts used to conduct multi locus simulations. Funding: MFS is supported by a Leverhulme Trust Early Career Fellowship (ECF-2020-095). CM is supported by a grant from the Gordon and Betty Moore Foundation (GBMF11489). SI is supported by funding from the Natural Environment Research Council (NE/S011188/1) and the European Research Council (SELECTHAPLOID - 101001341). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Faculty \ School:	Faculty of Science > School of Biological Sciences
UEA Research Groups:	Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation Faculty of Science > Research Groups > Organisms and the Environment
Depositing User:	LivePure Connector
Date Deposited:	15 Nov 2024 15:30
Last Modified:	18 Nov 2024 15:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/97697
DOI:	10.1371/journal.pgen.1010660

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