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When does gene flow facilitate evolutionary rescue?

View ORCID ProfileMatteo Tomasini, View ORCID ProfileStephan Peischl
doi: https://doi.org/10.1101/622142
Matteo Tomasini
∗Interfaculty Bioinformatics Unit, University of Bern, 3012 Bern, Switzerland
†Computational and Molecular Population Genetics Laboratory, Institute of Ecology and Evolution, University of Bern, 3012 Bern, Switzerland
‡Swiss Institute for Bioinformatics, 1015 Lausanne, Switzerland
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Stephan Peischl
∗Interfaculty Bioinformatics Unit, University of Bern, 3012 Bern, Switzerland
‡Swiss Institute for Bioinformatics, 1015 Lausanne, Switzerland
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  • For correspondence: stephan.peischl@bioinformatics.unibe.ch
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Abstract

Experimental and theoretical studies have highlighted the impact of gene flow on the probability of evolutionary rescue in structured habitats. Mathematical modelling and simulations of evolutionary rescue in spatially or otherwise structured populations showed that intermediate migration rates can often maximize the probability of rescue in gradually or abruptly deteriorating habitats. These theoretical results corroborate the positive effect of gene flow on evolutionary rescue that has been identified in experimental yeast populations. The observations that gene flow can facilitate adaptation are in seeming conflict with traditional population genetics results that show that gene flow usually hampers (local) adaptation. The conditions for when gene flow facilitates survival chances of populations rather than reducing them remains a key unresolved theoretical question. We here present a simple analytically tractable model for evolutionary rescue in a two-deme model with gene flow. Our main result is a simple condition for when migration facilitates evolutionary rescue, as opposed as no migration. We further investigate the roles of asymmetries in gene flow and / or carrying capacities, and the effects of density regulation and local growth rates on evolutionary rescue.

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Posted April 29, 2019.
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When does gene flow facilitate evolutionary rescue?
Matteo Tomasini, Stephan Peischl
bioRxiv 622142; doi: https://doi.org/10.1101/622142
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When does gene flow facilitate evolutionary rescue?
Matteo Tomasini, Stephan Peischl
bioRxiv 622142; doi: https://doi.org/10.1101/622142

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