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Simulation model of a predator prey system comprised of phytoseiulus persimilis and tetranychus urticae ii. model sensitivity to variations in the life history parameters of both species and to variations in the functional response and components of the numerical response



Simulation model of a predator prey system comprised of phytoseiulus persimilis and tetranychus urticae ii. model sensitivity to variations in the life history parameters of both species and to variations in the functional response and components of the numerical response



Researches on Population Ecology (Tokyo) 27(1): 1-24



A detailed sensitivity analysis of a model of a predator-prey system comprised of Tetranychus urticae and Phytoseiulus persimilis was performed. The aim was to assess the relative importance of the life history parameters of both species, the functional response and the components of the numerical response. In addition, the impact of the initial predator-prey ratio and the timing of predator introduction were tested. Results indicated that the most important factors in the systems were relative rates of predator and prey development, the time of onset of predator's oviposition, and the mode of the predator's ouiposition curve. The total oviposition of the predator, the effect of prey consumption on predator oviposition, and predator searching were important under some conditions. Factors of moderate importance were the adult female predator's functional response, total prey oviposition, the mode of the prey's oviposition curve, abiotic mortality of the pre-adult predator, and the effect of prey consumption on predator development and on the immature predator's mortality. Factors of least importance were the variances of the predator's and prey's oviposition curves, the abiotic mortality of the adult predator, the abiotic mortality of the pre-adult and adult prey, the functional response of the nymphal and adult male predators, and the effect of prey consumption on adult predator mortality. The sex ratios had little effect, except when the proportion of female predators was very low. The initial predator-prey ratio and time of predator introduction had significant impacts on system behavior, though the patterns of impact were different.

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