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Two-species interactions: Host-Parasitoid system. Two-species interactions: Host-Parasitoid system. =density of host species in generation t, =density of parasitoid in generation t, = =fraction of hosts not parasitized, =host reproductive rate,
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Two-species interactions: Host-Parasitoid system =density of host species in generation t, =density of parasitoid in generation t, = =fraction of hosts not parasitized, =host reproductive rate, =average number of viable eggs laid by a parasitoid on a single host. f c
Two-species interactions: Host-Parasitoid system • Estimation of the function • Assume the probability of encounter follows Poisson Distribution: a: searching efficiency of parasitoids
Two-species interactions: Host-Parasitoid system • Limitation of Growth Rate • Due to the carrying capacity of environment to the hosts
Two-species interactions: Host-Parasitoid system • Other factors influence the dynamic behavior 1.Efficiency of the searching 2.Heterogeneity of the environment (refuges) :the fraction of the population that can retreat to a refuge
