Systems analysis of an acarine predator-prey system II: Interactions in discontinuous environment |
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Authors: | Kazuyuki Fujita |
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Institution: | (1) Laboratory of Applied Entomology and Nematology, Faculty of Agriculture, Nagoya University, 464 Nagoya, Japan |
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Abstract: | Summary 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: (1) The prey are inevitably
eliminated in patches in which predators exist. (2) The density of prey declines and becomes extinct by plant defoliation
due to feeding by prey. In this regard this model is different from the models which mimickedHuffaker'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 I used a larger number of patches, a larger amount of
plant in each patch, and long-distance-migrations of the prey. In particular, frequent emigration of the prey regardless of
plant conditions was most effective. |
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Keywords: | |
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