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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.27: Poster

Thursday, February 28, 2008, 16:00–18:00, Poster C

Effects of quenched randomness on predator-prey interactions in a stochastic Lotka-Volterra lattice model — •Ulrich Dobramysl¹ and Uwe C. Täuber² — ¹Christian Doppler Labor für Oberflächenoptische Methoden, Johannes Kepler Universität Linz, Austria — ²Virginia Polytechnic Institute and State University, Blacksburg, VA, USA

We study the influence of spatially varying reaction rates (i.e., quenched randomness) on a stochastic two-species Lotka-Volterra lattice model for predator-prey interactions using Monte Carlo simulations. The effects on the asymptotic population densities, transient oscillations, spatial distributions, and on traveling wave and invasion front speed velocities are investigated. We find that spatial variability in the predation rate yields an increase in the asymptotic population densities of both predators and prey.