SPATIAL AND TEMPORAL VARIATION IN GUILD STRUCTURE - PARASITOIDS AND INQUILINES OF ANDRICUS-QUERCUSCALICIS (HYMENOPTERA, CYNIPIDAE) IN ITS NATIVE AND ALIEN RANGES

The communities associated with the invading gall wasp Andricus quercu scalicis vary considerably in species richness and species composition throughout its native and invaded ranges. Seventeen species of inquil ines and parasitoids were identified as coinhabitants of the agamic ga lls of Andricus quercuscalicis throughout Europe. The life-histories o f the parasitoid species are described; one is a solitary endoparasito id, one a gregarious endoparasitoid and the remainder are solitary ect oparasitoids. A tortricid moth which develops as an inquiline in the a gamic galls of A. quercuscalicis kills the gall causer; this is the fi rst description of such an interaction between moths and cynipids. Whi le some parasitoid species appear to be restricted in their attack to the native range of A. quercuscalicis, others were found throughout th e range. Geographic variation in the species composition and the possi ble role of the invasion history of the host are discussed. Food web p arameters calculated for the community from the native range and six r egions across the invaded range appear to be correlated with the resid ence time of the invading host, in accordance with studies of successi onal communities. However, it might be impossible to separate effects of time from those of species richness.