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• W4385225629 abstract "The ecological and evolutionary dynamics of large sets of individuals can be theoretically addressed using ideas and tools from statistical mechanics. This strategy has been addressed in the literature, both in the context of population genetics –whose focus is of genes or “genotypes”— and in adaptive dynamics, putting the emphasis on traits or “phenotypes”. Following this tradition, here we construct a framework allowing us to derive “macroscopic” evolutionary equations from a rather general “microscopic” stochastic dynamics representing the fundamental processes of reproduction, mutation and selection in a large community of individuals, each one characterized by its phenotypic features. Importantly, in our setup, ecological and evolutionary timescales are intertwined, which makes it particularly suitable to describe microbial communities, a timely topic of utmost relevance. Our framework leads to a probabilistic description of the distribution of individuals in phenotypic space —even in the case of arbitrarily large populations— as encoded in what we call “generalized Crow-Kimura equation” or “generalized replicator-mutator equation”. We discuss the limits in which such an equation reduces to the (deterministic) theory of “adaptive dynamics” (i.e. the standard approach to evolutionary dynamics in phenotypic space. Moreover, we emphasize the aspects of the theory that are beyond the reach of standard adaptive dynamics. In particular, by working out, as a guiding example, a simple model of a growing and competing population, we show that the resulting probability distribution can exhibit “dynamical phase transitions” changing from unimodal to bimodal —by means of an evolutionary branching— or to multimodal, in a cascade of evolutionary branching events. Furthermore, our formalism allows us to rationalize these cascades of transitions using the parsimonious approach of Landau’s theory of phase transitions. Finally, we extend the theory to account for finite populations and illustrate the possible consequences of the resulting stochastic or “demographic” effects. Altogether the present framework extends and/or complements existing approaches to evolutionary/adaptive dynamics and paves the way to more systematic studies of e.g. microbial communities as well as to future developments including theoretical analyses of the evolutionary process from the general perspective of non-equilibrium statistical mechanics." @default.
• W4385225629 created "2023-07-25" @default.
• W4385225629 creator A5026112679 @default.
• W4385225629 creator A5030462347 @default.
• W4385225629 date "2023-07-23" @default.
• W4385225629 modified "2023-10-10" @default.
• W4385225629 title "Statistical mechanics of phenotypic eco-evolution: from adaptive dynamics to complex diversification" @default.
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