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• W2505348534 abstract "Deterministic evolutionary theory robustly predicts that populations displaying altruistic behaviours will be driven to extinction by mutant cheats that absorb common benefits but do not themselves contribute. Here we show that when demographic stochasticity is accounted for, selection can in fact act in the reverse direction to that predicted deterministically, instead favouring cooperative behaviors that appreciably increase the carrying capacity of the population. Populations that exist in larger numbers experience a selective advantage by being more stochastically robust to invasions than smaller populations, and this advantage can persist even in the presence of reproductive costs. We investigate this general effect in the specific context of public goods production and find conditions for stochastic selection reversal leading to the success of public good producers. This insight, developed here analytically, is missed by both the deterministic analysis as well as standard game theoretic models that enforce a fixed population size. The effect is found to be amplified by space; in this scenario we find that selection reversal occurs within biologically reasonable parameter regimes for microbial populations. Beyond the public good problem, we formulate a general mathematical framework for models that may exhibit stochastic selection reversal. In this context, we describe a stochastic analogue to r-K theory, by which small populations can evolve to higher densities in the absence of disturbance." @default.
• W2505348534 created "2016-08-23" @default.
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• W2505348534 date "2016-07-22" @default.
• W2505348534 modified "2023-10-14" @default.
• W2505348534 title "Demographic noise can reverse the direction of deterministic selection" @default.
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• W2505348534 doi "https://doi.org/10.1073/pnas.1603693113" @default.
• W2505348534 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4987790" @default.
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• W2505348534 hasPublicationYear "2016" @default.
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