We propose a discrete-time dynamic model for studying the time evolution of ﬁsh stocks in an aquatic environment divided into two patches with different harvesting policies. In one patch a central authority imposes a constant ﬁshing effort, in the other proﬁt maximizing ﬁshermen engage in oligopolistic competition. The dynamics inside the patches are strongly interrelated by ecological factors, market interactions, and biomass diffusion. Particular cases are xamined and we offer results on existence, stability, local bifurcations of the equilibria and numerical explorations of the global dynamical properties. The complete model with ﬁshing activity in both regions is, mainly numerically, investigated.
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|Titolo:||A dynamic model of patch differentiated exploitation of fisheries|
|Data di pubblicazione:||2005|
|Appare nelle tipologie:||1.1 Articolo in rivista|