BURIE, Jean-Baptiste; DJIDJOU-DEMASSE, R; DUCROT, Arnaud

doi:10.1017/S0956792518000487

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BURIE, Jean-Baptiste
Institut de Mathématiques de Bordeaux [IMB]

DJIDJOU-DEMASSE, R
Santé et agroécologie du vignoble [UMR SAVE]

DUCROT, Arnaud
Institut de Mathématiques de Bordeaux [IMB]

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European Journal of Applied Mathematics. 2020, vol. 31, n° 1, p. 84-110

Cambridge University Press (CUP)

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This work is devoted to the study of an integro-differential system of equations modelling the genetic adaptation of a pathogen by taking into account both mutation and selection processes. First we study the asymptotic behaviour of the system and prove that it eventually converges to a stationary state. Next we more closely investigate the behaviour of the system in the presence of multiple evolutionary attractors. Under suitable assumptions and based on a small mutation variance asymptotic, we describe the existence of a long transient regime during which the pathogen population remains far from its asymptotic behaviour and highly concentrated around some phenotypic value that is different from the one described by its asymptotic behaviour. In that setting, the time needed for the system to reach its large time configuration is very long and multiple evolutionary attractors may act as a barrier of evolution that can be very long to bypass.< Réduire

Mots clés en anglais

asymptotic behaviour

Nonlocal equation

population genetics

transient behaviour

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Asymptotic and transient behaviour for a nonlocal problem arising in population genetics

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