title: Models for the effect of toxicant in single-species and predator-prey systems.
abstract: Models of single-species and predator-prey systems in a polluted closed environment are developed and partially analyzed. Three cases are considered: a single influx of toxicant, a constant influx of toxicant, and a periodic pollution of the environment. In the case of single-species growth we are able to determine some local and global dynamics. In the case of predator-prey systems, we investigate the existence of steady states for a small constant influx of toxicant.
authors.affiliation: Department of Mathematics, University of Alberta, Edmonton, Canada.
authors.forename: H I
authors.initials: HI
authors.lastname: Freedman
authors.forename: J B
authors.initials: JB
authors.lastname: Shukla
mesh_terms: D004787:Environmental Pollution; D015386:Hazardous Substances; D008962:Models, Theoretical; D011157:Population Dynamics; D013045:Species Specificity
chemical_list: D015386:Hazardous Substances