Effects of Parasitism over Two Competing Host populations Leading to persistence

摘要

In this paper we study the uniform persistence (UP) of an association of two com- peting host species sharing a directly transmitted macroparasite. Like predators, parasites can regulate UP while the hosts are either coexisting or in a dominance relationship without any infections, but cannot regulate UP in case the hosts are in bistability. The regulatory mechanism depends on the relationships between the parameters, such as host intrinsic growth rate, host carrying capacity, sus- ceptibility, parasite pathogenicity and the magnitude of parasite aggregation.