6533b86dfe1ef96bd12ca0ff
RESEARCH PRODUCT
Moment Equations for a Spatially Extended System of Two Competing Species
Davide ValentiBernardo SpagnoloX. SailerLutz Schimansky-geiersubject
PhysicsFluctuation phenomena random processes noise and Brownian motionSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciStatistical Mechanics (cond-mat.stat-mech)Multiplicative white noiseFOS: Physical sciencesFluctuation phenomena random processes noise and Brownian motion; Nonlinear dynamics and nonlinear dynamical systems; Population dynamics and ecological pattern formationCondensed Matter PhysicsSpatial distributionMultiplicative noiseElectronic Optical and Magnetic MaterialsSystem dynamicsMean field theorySpatial ecologyQuantitative Biology::Populations and EvolutionStatistical physicsNonlinear dynamics and nonlinear dynamical systemCondensed Matter - Statistical MechanicsMoment equationsCoupled map latticePopulation dynamics and ecological pattern formationdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-10-05 |