Evolution of discrete populations and the canonical diffusion of adaptive dynamics

Details Evolution of discrete populations and the canonical diffusion of adaptive dynamics Evolution of discrete populations and the canonical diffusion of adaptive dynamics

2006-01-26

arxiv.org/abs/math/0601643v4

Annals of Applied Probability 2007, Vol. 17, No. 1, 102-155

Mathematics

Probability

Published at http://dx.doi.org/10.1214/105051606000000628 in the Annals of Applied Probability (http://www.imstat.org/aap/) by

Scientific paper

10.1214/105051606000000628

The biological theory of adaptive dynamics proposes a description of the long-term evolution of a structured asexual population. It is based on the assumptions of large population, rare mutations and small mutation steps, that lead to a deterministic ODE describing the evolution of the dominant type, called the ``canonical equation of adaptive dynamics.'' Here, in order to include the effect of stochasticity (genetic drift), we consider self-regulated randomly fluctuating populations subject to mutation, so that the number of coexisting types may fluctuate. We apply a limit of rare mutations to these populations, while keeping the population size finite. This leads to a jump process, the so-called ``trait substitution sequence,'' where evolution proceeds by successive invasions and fixations of mutant types. Then we apply a limit of small mutation steps (weak selection) to this jump process, that leads to a diffusion process that we call the ``canonical diffusion of adaptive dynamics,'' in which genetic drift is combined with directional selection driven by the gradient of the fixation probability, also interpreted as an invasion fitness. Finally, we study in detail the particular case of multitype logistic branching populations and seek explicit formulae for the invasion fitness of a mutant deviating slightly from the resident type. In particular, second-order terms of the fixation probability are products of functions of the initial mutant frequency, times functions of the initial total population size, called the invasibility coefficients of the resident by increased fertility, defence, aggressiveness, isolation or survival.

Affiliated with

Also associated with

No associations

Rating

Evolution of discrete populations and the canonical diffusion of adaptive dynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evolution of discrete populations and the canonical diffusion of adaptive dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of discrete populations and the canonical diffusion of adaptive dynamics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-171262