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Changes in searching responses with temperature of Cyrtorhinus lividipennis reuter on the eggs of the brown planthopper, Nilaparvata lugens



Changes in searching responses with temperature of Cyrtorhinus lividipennis reuter on the eggs of the brown planthopper, Nilaparvata lugens



Researches on Population Ecology 39(2): 201-206



The functional response of Cyrtorhinus lividipennis Reuter attacking the brown planthopper (Nilaparvata lugens (Stal.), BPH) eggs on rice was determined at six constant temperatures of 20degreeC, 23degreeC, 26degreeC, 29degreeC, 32degreeC and 35degreeC. Rogers' (1972) random predator equations were fitted to the data for each temperature separately. The equation model adequately described a Holling's Type II functional response for C. lividipennis and produced biologically realistic estimates of attack rates and handling times at five experimental temperatures between 20degreeC and 32degreeC. However, at 35degreeC, a negative handling time (Th=-0.0029) was produced. The effect of temperature was incorporated into Rogers' equation by making the attack rate (a) and handling time (Th) functions of temperature within the range 20degreeC to 32degreeC. The attack rate and handling time were fitted as hyperbola and reciprocal hyperbola functions of temperature respectively. The temperature incorporating four-parameter composite model fitted the combined data as well as did separate Rogers' equations based on the parameter estimates.

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