关键词：
Acarine
Adjacent Patch
Single Prey
Colonization Probability
Prey Mite
摘要：
An acarine predator-prey system in a circular stepping-stone environment was described with a simulation model to elucidate the factors responsible for persistence of the system. The main assumptions in this model are that the prey are inevitably eliminated in patches in which predators exist, and the density of prey declines and becomes extinct by plant defoliation due to feeding by prey. In this regard, the model is different from the models which mimicked Hauffaker''s (1958) experiments and assumed stable plant-prey relations. Analyses showed that the critical factor in persistence of the predator-prey system was the plant-prey relations, at any combination of other parameters involved in the model. The predator-prey system did not persist long under the unstable relationship of prey and plant. Otherwise, the system persisted longer, especially when a larger number of patches, a larger amount of plant in each patch, and long-distance-migrations of the prey were used. In particular, frequent emigration of the prey regardless of plant conditions was most effective.
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