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A Minimal Model of Pursuit-Evasionin a Predator-Prey System

Published online by Cambridge University Press:  15 June 2008

Y. Tyutyunov*
Affiliation:
Laboratory of Mathematical Modelling of Biological Processes, Department of Mathematical Modelling in Economics and Ecology, Vorovich Research Institute of Mechanics and Applied Mathematics, Southern Federal University, 200/1 Stachki street, 344090 Rostov-on-Don, Russia
L. Titova
Affiliation:
Laboratory of Mathematical Modelling of Biological Processes, Department of Mathematical Modelling in Economics and Ecology, Vorovich Research Institute of Mechanics and Applied Mathematics, Southern Federal University, 200/1 Stachki street, 344090 Rostov-on-Don, Russia
R. Arditi
Affiliation:
Ecologie des populations et communautés, AgroParisTech, 16 rue Claude Bernard, 75231 Paris cedex 05, France
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Abstract

A conceptual minimal model demonstrating spatially heterogeneous wave regimesinterpreted as pursuit-evasion in predator-prey system is constructed and investigated. Themodel is based on the earlier proposed hypothesis that taxis accelerations of prey and predators are proportional to the density gradient of another population playing a role of taxis stimulus. Considering acceleration rather than immediate velocity allows obtaining realistic solutions even while ignoring variations of total abundances of both modelled populations. Linear analysis of the model shows that stationary homogeneous regime becomes oscillatory unstable with respect to small heterogeneous perturbations if either taxis activities or total population abundances are high enough. The ability for active directed movement of both prey and predators is the necessary condition for spatial self-organization. Numerical simulations illustrate analytical results. The relation between the proposed model and conventional two-component systems with cross-diffusion is discussed.

Type
Research Article
Copyright
© EDP Sciences, 2007

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