Abstract
The functional response of Anisopteromalus calandrae (Howard) attacking Sitophilus zeamais Motschulsky on shelled corn was measured at constant temperatures of 20, 25, 30, and 35°C. Separate random parasite equations (Rogers, D. J. 1972. Random search and insect population models. J. Anim. Ecol. 41: 369-383) were fit to the number of progeny produced in 1 d. Temperature was incorporated into Rogers' equation by making both the attack coefficient ( a ) and handling time ( Th ) functions of temperature. The attack coefficient was fitted as an exponential function and handling time as an inverse function of temperature. The resulting four-parameter composite model fit the data as well as the separate Rogers' equations, although the predicted functional response plateau at temperatures >20°C tended to be lower than those of the Rogers' equations.
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