Moment Equations for a Spatially Extended System of Two Competing Species

Details Moment Equations for a Spatially Extended System of Two Competing Species Moment Equations for a Spatially Extended System of Two Competing Species

2005-10-05

arxiv.org/abs/cond-mat/0510104v1

Physics

Condensed Matter

Statistical Mechanics

10 pages, 3 figures

Scientific paper

10.1140/epjb/e2006-00102-5

The dynamics of a spatially extended system of two competing species in the presence of two noise sources is studied. A correlated dichotomous noise acts on the interaction parameter and a multiplicative white noise affects directly the dynamics of the two species. To describe the spatial distribution of the species we use a model based on Lotka-Volterra (LV) equations. By writing them in a mean field form, the corresponding moment equations for the species concentrations are obtained in Gaussian approximation. In this formalism the system dynamics is analyzed for different values of the multiplicative noise intensity. Finally by comparing these results with those obtained by direct simulations of the time discrete version of LV equations, that is coupled map lattice (CML) model, we conclude that the anticorrelated oscillations of the species densities are strictly related to non-overlapping spatial patterns.

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