title: Emergence of population growth models: fast migration and slow growth.
abstract: We present aggregation and emergence methods in large-scale dynamical systems with different timescales. Aggregation corresponds to the reduction of the dimension of a dynamical system which is replaced by a smaller model for a small number of global variables at a slow timescale. We study the couplings between fast and slow dynamics leading to the emergence of global properties in the aggregated model. First, we study the case of a single population in a patchy environment. Growth rates are assumed to be linear on each patch. Individuals can migrate from one patch to another at a fast timescale. We choose different density dependent migration processes. In each case, we use aggregation methods to obtain the corresponding growth equation for the total density of the population at a slow timescale. We look for particular density dependent migration processes leading to an aggregated logistic-like equation. Second, we study the case of two interacting populations. A particular choice of density dependent migrations leads to an aggregated competition model.
authors.affiliation: UMR CNRS 5558, Université Claude Bernard Lyon-1, Villeubanne, France.
authors.forename: P
authors.initials: P
authors.lastname: Auger
authors.forename: J C
authors.initials: JC
authors.lastname: Poggiale
mesh_terms: D000818:Animals; D004463:Ecology; D004777:Environment; D015233:Models, Statistical; D011156:Population Density; D011158:Population Growth