Modelling the impact of an invasive insect via reaction-diffusion - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Journal Articles Mathematical Biosciences Year : 2008

Modelling the impact of an invasive insect via reaction-diffusion

Abstract

An exotic, specialist seed chalcid, Megastigmus schimitscheki, has been introduced along with its cedar host seeds from Turkey to southeastern France during the early 1990s. It is now expanding in plantations of Atlas Cedar (Cedrus atlantica). We propose a model to predict the expansion and impact of this insect. This model couples a time-discrete equation for the ovo-larval stage with a two-dimensional reaction-diffusion equation for the adult stage, through a formula linking the solution of the reaction-diffusion equation to a seed attack rate. Two main diffusion operators, of Fokker-Planck and Fickian types, are tested. We show that taking account of the dependence of the insect mobility with respect to spatial heterogeneity, and choosing the appropriate diffusion operator, are critical factors for obtaining good predictions.

Dates and versions

hal-02659001 , version 1 (30-05-2020)

Identifiers

Cite

Lionel Roques, Marie-Anne Auger-Rozenberg, Alain Roques. Modelling the impact of an invasive insect via reaction-diffusion. Mathematical Biosciences, 2008, 216 (1), pp.47-55. ⟨10.1016/j.mbs.2008.08.002⟩. ⟨hal-02659001⟩
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