Evolutionary rescue in randomly mating, selfing, and clonal populations Journal Article

Author(s): Uecker, Hildegard
Article Title: Evolutionary rescue in randomly mating, selfing, and clonal populations
Affiliation IST Austria
Abstract: Severe environmental change can drive a population extinct unless the population adapts in time to the new conditions (\"evolutionary rescue\"). How does biparental sexual reproduction influence the chances of population persistence compared to clonal reproduction or selfing? In this article, we set up a one-locus two-allele model for adaptation in diploid species, where rescue is contingent on the establishment of the mutant homozygote. Reproduction can occur by random mating, selfing, or clonally. Random mating generates and destroys the rescue mutant; selfing is efficient at generating it but at the same time depletes the heterozygote, which can lead to a low mutant frequency in the standing genetic variation. Due to these (and other) antagonistic effects, we find a nontrivial dependence of population survival on the rate of sex/selfing, which is strongly influenced by the dominance coefficient of the mutation before and after the environmental change. Importantly, since mating with the wild-type breaks the mutant homozygote up, a slow decay of the wild-type population size can impede rescue in randomly mating populations.
Keywords: environmental change; Rapid adaptation; Dominance; Rate of selfing; Rate of sex
Journal Title: Evolution
Volume: 71
Issue 4
ISSN: 1558-5646
Publisher: Wiley-Blackwell  
Date Published: 2017-04-01
Start Page: 845
End Page: 858
DOI: 10.1111/evo.13191
Notes: The author thanks Joachim Hermisson, Sally Otto, Nick Barton, Sebastian Bonhoeffer, Sylvain Glémin, Jitka Polechová, Mato Lagator, Srdjan Sarikas, Derek Setter, Richard Gomulkiewicz, Stephen Proulx, and an anonymous referee for helpful discussions and/or comments on the manuscript. This work was made possible by a “For Women in Science” fellowship (L'Oréal Österreich in cooperation with the Austrian Commission for UNESCO and the Austrian Academy of Sciences with financial support from the Federal Ministry for Science and Research Austria) and by European Research Council Grants 250152 (to N.B.) and 268540 (to S.B.).
Open access: yes (repository)