Individual-Based Probabilistic Models of Adaptive Evolution and Various Scaling Approximations

Nicolas Champagnat, Régis Ferrière, Sylvie Méléard

Research output: Chapter in Book/Report/Conference proceedingChapter

19 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 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)
Title of host publicationProgress in Probability
PublisherBirkhauser
Pages75-113
Number of pages39
DOIs
StatePublished - 2008

Publication series

NameProgress in Probability
Volume59
ISSN (Print)1050-6977
ISSN (Electronic)2297-0428

Keywords

  • Darwinian evolution
  • adaptive dynamics
  • birth-death-mutation-competition point process
  • fitness
  • mutation-selection dynamics
  • nonlinear integro-differential equations
  • nonlinear partial differential equations
  • nonlinear superprocesses

ASJC Scopus subject areas

  • Statistics and Probability
  • Mathematics (miscellaneous)
  • Mathematical Physics
  • Applied Mathematics

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