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Chotibut, Thiparat; Nelson, David R. (2016)
Languages: English
Types: Preprint
Subjects: Quantitative Biology - Populations and Evolution, Condensed Matter - Statistical Mechanics, Physics - Biological Physics

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arxiv: Quantitative Biology::Populations and Evolution
Standard neutral population genetics theory with a strictly fixed population size has important limitations. An alternative model that allows independently fluctuating population sizes and reproduces the standard neutral evolution is reviewed. We then study a situation such that the competing species are neutral at the equilibrium population size but population size fluctuations nevertheless favor fixation of one species over the other. In this case, a separation of timescales emerges naturally and allows adiabatic elimination of a fast population size variable to deduce the fluctuations-induced selection dynamics near the equilibrium population size. The results highlight the incompleteness of the standard population genetics with a strictly fixed population size.
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