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Abstract
SUMMARY (1) Patch time allocation by the parasitoid Asobara tabida Nees was studied on patches with different host densities. (2) The parasitoid increased its searching time and giving up time with increasing host density. These increases were caused by a response of the parasitoid to the number of encounters with unparasitized hosts; the amount of kairomone in a patch may have had an additional incremental effect on patch time. (3) Encounters with parasitized hosts had no effect on searching time and giving up time. (4) The percentage of hosts parasitized first increased with host density and then levelled off at densities of more than four host larvae per patch, thus producing an accelerating functional response. (5) The foraging behaviour of A. tabida is compared to that predicted by optimal foraging models.
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