Permanence of populations in a polluted environment.
Studies of several population-toxicant models are discussed. Under the hypothesis that the exogenous input of toxicant into the environment is periodic in time, the conditions for permanence of populations are obtained.
Wang
W
W
Department of Mathematics, Southwest Normal University, Chongquing, People's Republic of China.
Ma
Z
Z
D000818:Animals; D004787:Environmental Pollution; D008962:Models, Theoretical; D011157:Population Dynamics; D013997:Time Factors