A new proof for the convergence of an individual based model to the Trait substitution sequence

Details A new proof for the convergence of an individual based model to the Trait substitution sequence A new proof for the convergence of an individual based model to the Trait substitution sequence

2012-03-11

arxiv.org/abs/1203.2361v2

Mathematics

Probability

23 pages

Scientific paper

We consider a continuous time stochastic individual based model for a population structured only by an inherited vector trait and with logistic interactions. We consider its limit in a context from adaptive dynamics: the population is large, the mutations are rare and we view the process in the timescale of mutations. Using averaging techniques due to Kurtz (1992), we give a new proof of the convergence of the individual based model to the trait substitution sequence of Metz et al. (1992) first worked out by Dieckman and Law (1996) and rigorously proved by Champagnat (2006): rigging the model such that "invasion implies substitution", we obtain in the limit a process that jumps from one population equilibrium to another when mutations occur and invade the population.

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