Quasicycles in a spatial predator-prey model.
We use spatial models of simple predator-prey interactions to predict that predator and prey numbers oscillate in time and space. These oscillations are not seen in the deterministic versions of the models, but are due to stochastic fluctuations about the time-independent solutions of the deterministic equations which are amplified due to the existence of a resonance. We calculate the power spectra of the fluctuations analytically and show that they agree well with results obtained from stochastic simulations. This work extends the analysis of these quasicycles from that previously developed for well-mixed systems to spatial systems, and shows that the ideas and methods used for nonspatial models naturally generalize to the spatial case.
Lugo
Carlos A
CA
Theoretical Physics Group, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
McKane
Alan J
AJ
D000818:Animals; D001703:Biophysics / Q000379:methods; D002755:Choice Behavior; D003468:Cultural Evolution; D003643:Death; D017753:Ecosystem; D036801:Parturition; D011156:Population Density; D011235:Predatory Behavior / Q000502:physiology*; D013028:Space Perception; D013269:Stochastic Processes