Title

A mean field model for species abundance

Document Type

Article

Publication Date

4-1-2003

Abstract

In this paper, we use the multitype mean field voter model as a model of species interaction, to obtain results about species abundance. Briefly, we start with the complete graph on n vertices, C , with each site occupied by a particle. Particles are represented by a value in (0, 1), where distinct values represent different species. Particles then undergo mutation at rate α, and are relabelled with a value chosen uniformly from (0, 1). Particles also give birth at rate 1, and invade any of the other n sites randomly. This process has a unique stationary distribution denoted by ξ , which is given by the Ewens sampling formula. For each value in (0, 1) that is present in ξ , we count the number of particles represented by the same value, and call that the patch size of the species. Let K [a, b] denote the number of species with patch size in [a, b]. We study the limiting distribution of K [a, b], for certain values of a and b, as the mutation rate α tends to 0, which will in turn force n → ∞. © 2002 Published by Elsevier Science B.V. n ∞ ∞ n n n n

Publication Name

Stochastic Processes and their Applications

Volume Number

104

First Page

325

Last Page

347

Issue Number

2

DOI

10.1016/S0304-4149(02)00235-1

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