Harvesting induced fluctuations: insights from a threshold management policy.
In this work, it is shown that in a deterministic context, a threshold policy can induce cyclic behavior in an otherwise exploited stable population. These dynamics ensue as a result of the combination of the degree of harvesting pressure and more protective threshold densities. Virtual equilibrium in variable structure systems plays a determinant role in this dynamical outcome.
da Silveira Costa
Michel Iskin
MI
Laboratório Nacional de Computação Científica, Av. Getúlio Vargas, 333 Quitandinha Petrópolis-RJ 25651-070, Brazil. michel@lncc.br
D000818:Animals; D003247:Conservation of Natural Resources / Q000379:methods*; D005398:Fisheries; D005399:Fishes / Q000254:growth & development*; D008954:Models, Biological; D011157:Population Dynamics