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Article Dans Une Revue Ecological Modelling Année : 2018

An economic model of metapopulation dynamics

Résumé

In this paper, we aim to model the impact of human activities on the wildlife habitat in a general equilibrium framework by embedding the Levins model (1969) of metapopulation dynamics into a Ramsey model (1928) with a pollution externality. In the long run, as in Levins (1969), two steady states coexist: a zero one with mass extinction and another one with positive wildlife when the migration rate of the metapopulation exceeds the rate of extinction. A green tax always increases the wildlife and lowers the consumption demand. It is welfare improving if and only if agents overweight the wildlife. In the short run, we show that a sufficiently negative effect of wildlife habitat on consumption demand can lead to the emergence of a limit cycle near the positive steady state through a Hopf bifurcation. We show also that the negative pollution effect on wildlife habitat works as a destabilizing force in the economy by promoting limit cycles.

Dates et versions

hal-02621019 , version 1 (26-05-2020)

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Stefano Bosi, David Desmarchelier. An economic model of metapopulation dynamics. Ecological Modelling, 2018, 387, pp.196-204. ⟨10.1016/j.ecolmodel.2018.09.013⟩. ⟨hal-02621019⟩
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