Conflict over fertilization underlies the transient evolution of reinforcement
| Autor: | Alison M. Wardlaw, Jeffrey Ross-Ibarra, Catherine A. Rushworth, Yaniv Brandvain |
|---|---|
| Přispěvatelé: | Jennions, Michael D |
| Rok vydání: | 2021 |
| Předmět: |
Male
Linkage disequilibrium Population Biology Medical and Health Sciences General Biochemistry Genetics and Molecular Biology Sexual conflict Genetic Genetic model medicine Humans Mating education Hybridization education.field_of_study General Immunology and Microbiology Agricultural and Veterinary Sciences General Neuroscience Reproduction Reproductive isolation Biological Sciences Biological Evolution medicine.anatomical_structure Germ Cells Phenotype Evolutionary biology Fertilization Trait Gamete Hybridization Genetic Female General Agricultural and Biological Sciences Developmental Biology |
| Zdroj: | PLoS biology, vol 20, iss 10 |
| ISSN: | 1545-7885 |
| Popis: | When two populations or species hybridize, their offspring often experience reductions in fitness relative to either parental population. The production of low fitness hybrids may be prevented by the evolution of increased prezygotic isolation; a process known as reinforcement. Theoretical challenges to the evolution of reinforcement are generally cast as a coordination problem — e.g., linkage disequilibrium between trait and preference loci is difficult to maintain in the face of recombination. However, the evolution of reinforcement also poses a potential conflict between mates. For example, the opportunity costs to hybridization may differ between the sexes or species. This is particularly likely for postmating prezygotic isolation, as the ability to fertilize both conspecific and heterospecific eggs is beneficial to male gametes, but heterospecific mating may incur a cost for female gametes. Motivated by this problem, we develop a population genetic model of interspecific conflict over reinforcement, inspired by ‘gametophytic factors’, which act as postmating prezygotic barriers among Zea mays subspecies. We demonstrate that this conflict results in the transient evolution of reinforcement – after female preference for a conspecific gamete trait rises to high frequency, male traits adaptively introgress into the other population. Ultimately the male gamete trait fixes in both species, and prezygotic isolation returns to pre-reinforcement levels. We interpret geographic patterns of isolation among Z. mays subspecies in light of these findings, and suggest when and how this conflict can be mediated. Our results suggest that sexual conflict may pose an understudied obstacle to the evolution of reinforcement via postmating prezygotic isolation. |
| Databáze: | OpenAIRE |
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