Responses To Parasitoid Odours And Patch Marks

Janssen et al. (1991) showed in olfactometer experiments that Leptopilina heterotoma is attracted to the odour of stinkhorn fungi containing larvae of Drosophila phalerata. When these patches are offered in an olfactometer together with similar patches on which searching females of L. clavipes are present, L. heterotoma avoids the odour fields of patches containing L. clavipes females. The conclusion from these observations is that L. clavipes produces an odour whilst searching, which repels...

Host Location By Parasitoids

Perhaps one of the more straightforward means of deducing how a predator or parasitoid may locate its prey is to pay close attention to the insect's morphology. For example, pipunculid flies have extremely well developed compound eyes, and in the females the forward-facing facets are considerably enlarged (Jervis, 1992), so it can be inferred that host-finding in these parasitoids relies on vision (confirmed by Forbes P. Benton, see Waloff and Jervis, 1987). However, some caution should be used...

Comparative Studies Of Local And Nonlocal Mating

Growing numbers of authors have examined cross-species relationships between sex ratio and one important aspect of mating systems the degree of local mate competition (mating at the natal site). Four studies have compared sex ratio and mating system across two congeneric species (Suzuki and Hiehata, 1985 Kazmer and Luck, 1991 King and Skinner, 1991 B. Stille and E.D. Parker, unpublished). Suzuki and Hiehata (1985) assessed mating system by direct observations, Kazmer and Luck, (1991) used...