Persistence and Extinction of an Individual in a Polluted Environment

Persistence and extinction of population or community models in a polluted environment have been investigated by many papers,but the study of individual models in a polluted environment is just in the beginning.Up to now,there are few papers which studied persistence and extinction of a non-autonomous toxicant-individual models.In this article, this problem has been discussed.Some sufficient conditions on persistence or extinction for a non-autonomous toxicant-individual model have been obtained.