Fitness differences suppress the number of mating types in evolving isogamous species.
balancing selection
isogamy
mating types
negative frequency-dependent selection
self-incompatibility
Journal
Royal Society open science
ISSN: 2054-5703
Titre abrégé: R Soc Open Sci
Pays: England
ID NLM: 101647528
Informations de publication
Date de publication:
Feb 2020
Feb 2020
Historique:
received:
13
12
2019
accepted:
31
01
2020
entrez:
8
4
2020
pubmed:
8
4
2020
medline:
8
4
2020
Statut:
epublish
Résumé
Sexual reproduction is not always synonymous with the existence of two morphologically different sexes; isogamous species produce sex cells of equal size, typically falling into multiple distinct self-incompatible classes, termed mating types. A long-standing open question in evolutionary biology is: what governs the number of these mating types across species? Simple theoretical arguments imply an advantage to rare types, suggesting the number of types should grow consistently; however, empirical observations are very different. While some isogamous species exhibit thousands of mating types, such species are exceedingly rare, and most have fewer than 10. In this paper, we present a mathematical analysis to quantify the role of fitness variation-characterized by different mortality rates-in determining the number of mating types emerging in simple evolutionary models. We predict that the number of mating types decreases as the variance of mortality increases.
Identifiants
pubmed: 32257356
doi: 10.1098/rsos.192126
pii: rsos192126
pmc: PMC7062084
doi:
Types de publication
Journal Article
Langues
eng
Pagination
192126Informations de copyright
© 2020 The Authors.
Déclaration de conflit d'intérêts
We declare we have no competing interests.
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