Monte carlo simulations of parapatric speciation

Details Monte carlo simulations of parapatric speciation Monte carlo simulations of parapatric speciation

2005-08-15

arxiv.org/abs/q-bio/0508017v1

Biology

Quantitative Biology

Populations and Evolution

submitted to Phys.Rev. E

Scientific paper

10.1140/epjb/e2006-00251-5

Parapatric speciation is studied using an individual--based model with sexual reproduction. We combine the theory of mutation accumulation for biological ageing with an environmental selection pressure that varies according to the individuals geographical positions and phenotypic traits. Fluctuations and genetic diversity of large populations are crucial ingredients to model the features of evolutionary branching and are intrinsic properties of the model. Its implementation on a spatial lattice gives interesting insights into the population dynamics of speciation on a geographical landscape and the disruptive selection that leads to the divergence of phenotypes. Our results suggest that assortative mating is not an obligatory ingredient to obtain speciation in large populations at low gene flow.

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