寄生入侵对循环竞争系统动态的影响OA北大核心CSTPCD

Parasite can alter the dynamics and diversity of competitive communities indirectly.Here,we firstly constructed a cyclic competition system with three species mediated by a free-living parasite.Subsequently,we explored the effects of parasite traits on the transient dynamics of three host species,as well as the stability and species richness of the competitive community at different time-scales.Simulation results reveal that the invasion of parasite is a key factor in inducing the community unstability.Parasite traits and interspecific competition are likely crucial in structuring communities and disease dynamics.In particularly,parasite invasion can transform the classically periodic oscillation of cyclic community into more complex dynamics,such as periodic oscillation of the community at a large time scale,and periodic oscillation of a single species at a small time scale.Additionally,analysis of the autocorrelation function and partial autocorrelation function analysis for time series of species'biomass in the cyclic competition system indicate that the time series of species'biomass at both large and small time scales are stationary.Furthermore,as parasites invade the initial stage equilibrium dynamics of cyclic competition system,pathogenic infection can induce to the extinction of two species,leaving only one species to persist and undergo periodic oscillation.In cases of initial local stability,pathogenic infection can cause all three species to undergo periodic oscillation coincidently.Moreover,the observed transient dynamics of cyclic communities,including the timing of sudden switches in dynamics and other characteristics of transients,occur during the process of parasite invasion.Finally,three parasite traits(transmission rate,shedding rate and virulence)can alter the periodicity and corresponding species richness of cyclic competition.In short,parasite invasion can dramatically change community stability and species diversity.