摘要：A model of a phytoplankton–zooplankton prey-predator system with viral infection of phytoplankton is investigated. Virus particles ( V ) are taken into account by an explicit equation. Phytoplankton is split into a susceptible ( S ) and an infected ( I ) class. A lytic infection is considered, thus, infected phytoplankton cells stop reproducing as soon as the infection starts and die at an increased mortality rate. Zooplankton ( Z ) is grazing on both susceptible and infected phytoplankton following a Holling-type II functional response. After the local dynamics of the V − S − I − Z system is analysed, numerical solutions of a stochastic reaction–diffusion model of the four species are presented. These show a spatial competition between zooplankton and viruses, although these two species are not explicitly coupled by the model equations.
