Evolutionary dynamics of a quantitative trait in a finite asexual population

Theoretical Population Biology
Florence Débarre, Sarah P Otto

Abstract

In finite populations, mutation limitation and genetic drift can hinder evolutionary diversification. We consider the evolution of a quantitative trait in an asexual population whose size can vary and depends explicitly on the trait. Previous work showed that evolutionary branching is certain ("deterministic branching") above a threshold population size, but uncertain ("stochastic branching") below it. Using the stationary distribution of the population's trait variance, we identify three qualitatively different sub-domains of "stochastic branching" and illustrate our results using a model of social evolution. We find that in very small populations, branching will almost never be observed; in intermediate populations, branching is intermittent, arising and disappearing over time; in larger populations, finally, branching is expected to occur and persist for substantial periods of time. Our study provides a clearer picture of the ecological conditions that facilitate the appearance and persistence of novel evolutionary lineages in the face of genetic drift.

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References

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Citations

Feb 23, 2018·Proceedings. Biological Sciences·Jonathan RollandNicolas Salamin
Jul 22, 2019·Evolution; International Journal of Organic Evolution·Charles Mullon, Laurent Lehmann
Oct 9, 2019·Biology Letters·José Alexandre F Diniz-FilhoPasquale Raia
Oct 5, 2018·Journal of the Royal Society, Interface·Todd L ParsonsSylvain Gandon
Feb 17, 2021·PLoS Computational Biology·Gil Jorge Barros HenriquesMichael Doebeli
Dec 22, 2019·Theoretical Population Biology·Eva Kisdi
Jun 19, 2021·Ecology and Evolution·Peter Czuppon, Arne Traulsen

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