Canadian Forest Service Publications

The search pattern of a parasitoid wasp, Aphelinus asychis, for its host. 1992. Li, Chao; Roitberg, B.D.; Mackauer, M. OIKOS 65(2): 207-212.

Year: 1992

Issued by: Northern Forestry Centre

Catalog ID: 21355

Language: English

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We examined the within-patch foraging behaviour of a parasitoid wasp, using an experimental system that consisted of Aphelinus asychis females searching for pea aphids in a petri dish. The wasps' encounter rate with aphids agreed with an expected random distribution in 18 of 22 cases examined. We used a simulation model to find the general conditions under which a random or a systematic search pattern would be favoured by natural selection. We compared the influence of four combinations of searching behaviour (random vs systematic) and target movement (moving vs non- moving) on the numbers of targets encountered, of hosts accepted for oviposition, and of prey consumed by a forager