From individual stochastic processes to macroscopic models in adaptive evolution

Nicolas Champagnat, Regis Ferriere, Sylvie Meleard

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

We are interested in modelling Darwinian evolution, resulting from the interplay of phenotypic variation and natural selection through ecological interactions. Our models are rooted in the microscopic, stochastic description of a population of discrete individuals characterized by one or several adaptive traits. The population is modelled as a stochastic point process whose generator captures the probabilistic dynamics over continuous time of birth, mutation, and death, as influenced by each individual's trait values, and interactions between individuals. An offspring usually inherits the trait values of her progenitor, except when a mutation causes the offspring to take an instantaneous mutation step at birth to new trait values. We look for tractable large population approximations. By combining various scalings on population size, birth and death rates, mutation rate, mutation step, or time, a single microscopic model is shown to lead to contrasting macroscopic limits of a different nature: deterministic, in the form of ordinary, integro-, or partial differential equations, or probabilistic, like stochastic partial differential equations or superprocesses. In the limit of rare mutations, we show that a possible approximation is a jump process, justifying rigorously the so-called trait substitution sequence. We thus unify different points of view concerning mutation-selection evolutionary models.

Original languageEnglish (US)
Pages (from-to)2-44
Number of pages43
JournalStochastic Models
Volume24
Issue numberSUPPL. 1
DOIs
StatePublished - Nov 17 2008
Externally publishedYes

Keywords

  • Adaptive dynamics
  • Birth-death-mutation-competition point process
  • Darwinian evolution
  • Fitness
  • Mutation-selection dynamics
  • Nonlinear integro-differential equations
  • Nonlinear partial differential equations
  • Nonlinear superprocesses

ASJC Scopus subject areas

  • Statistics and Probability
  • Modeling and Simulation
  • Applied Mathematics

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