Influence of a spatial structure on the long time behavior of a competitive Lotka-Volterra type system

Hélène Leman; Sylvie Méléard; Sepideh Mirrahimi

doi:10.3934/dcdsb.2015.20.469

Article Contents

2015, Volume 20, Issue 2: 469-493. Doi: 10.3934/dcdsb.2015.20.469

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Influence of a spatial structure on the long time behavior of a competitive Lotka-Volterra type system

1.
CMAP, Ecole Polytechnique, UMR 7641, route de Saclay, 91128 Palaiseau Cedex
2.
Institut de Mathématiques de Toulouse; UMR 5219, Université de Toulouse, CNRS, UPS IMT, F-31062 Toulouse Cedex 9

Received: January 2014

Revised: October 2014

Published: March 2015

Abstract / Introduction Related Papers Cited by

Abstract

To describe population dynamics, it is crucial to take into account jointly evolution mechanisms and spatial motion. However, the models which include these both aspects, are not still well-understood. Can we extend the existing results on type structured populations, to models of populations structured by type and space, considering diffusion and nonlocal competition between individuals?
We study a nonlocal competitive Lotka-Volterra type system, describing a spatially structured population which can be either monomorphic or dimorphic. Considering spatial diffusion, intrinsic death and birth rates, together with death rates due to intraspecific and interspecific competition between the individuals, leading to some integral terms, we analyze the long time behavior of the solutions. We first prove existence of steady states and next determine the long time limits, depending on the competition rates and the principal eigenvalues of some operators, corresponding somehow to the strength of traits. Numerical computations illustrate that the introduction of a new mutant population can lead to the long time evolution of the spatial niche.

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Mathematics Subject Classification: 35Q92, 45K05, 35K57, 35B40.

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