Inside dynamics of solutions of integro-differential equations

Olivier Bonnefon; Jérôme Coville; Jimmy Garnier; Lionel Roques

doi:10.3934/dcdsb.2014.19.3057

Article Contents

2014, Volume 19, Issue 10: 3057-3085. Doi: 10.3934/dcdsb.2014.19.3057

This issue Previous Article Some paradoxical effects of the advection on a class of diffusive equations in Ecology Next Article Effects of dispersal in a non-uniform environment on population dynamics and competition: A patch model approach

Inside dynamics of solutions of integro-differential equations

1.
INRA, UR 546 Biostatistique et Processus Spatiaux (BioSP), F-84914 Avignon

Received: June 30, 2013

Revised: December 31, 2013

Published: November 2014

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Abstract

In this paper, we investigate the inside dynamics of the positive solutions of integro-differential equations \begin{equation*} \partial_t u(t,x)= (J\star u)(t,x) -u(t,x) + f(u(t,x)), \ t>0 \hbox{ and } x\in\mathbb{R}, \end{equation*} with both thin-tailed and fat-tailed dispersal kernels $J$ and a monostable reaction term $f.$ The notion of inside dynamics has been introduced to characterize traveling waves of some reaction-diffusion equations [23]. Assuming that the solution is made of several fractions $\upsilon^i\ge 0$ ($i\in I \subset \mathbb{N}$), its inside dynamics is given by the spatio-temporal evolution of $\upsilon^i$. According to this dynamics, the traveling waves can be classified in two categories: pushed and pulled waves. For thin-tailed kernels, we observe no qualitative differences between the traveling waves of the above integro-differential equations and the traveling waves of the classical reaction-diffusion equations. In particular, in the KPP case ($f(u)\leq f'(0)u$ for all $u\in(0,1)$) we prove that all the traveling waves are pulled. On the other hand for fat-tailed kernels, the integro-differential equations do not admit any traveling waves. Therefore, to analyse the inside dynamics of a solution in this case, we introduce new notions of pulled and pushed solutions. Within this new framework, we provide analytical and numerical results showing that the solutions of integro-differential equations involving a fat-tailed dispersal kernel are pushed. Our results have applications in population genetics. They show that the existence of long distance dispersal events during a colonization tend to preserve the genetic diversity.

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Mathematics Subject Classification: Primary: 35R09, 45K05; Secondary: 35B06, 35K57.

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