Factors Affecting Diurnal Activities of Solitary Wasps (Hymenoptera: Sphecidae and Pompilidae)
Factors affecting the diurnal activities of 2 solitary wasps species, Bembecinus tridens (Fabricius 1781) and Pompilus cinereus (Fabricius 1775), were investigated in a sandy grassland area of the Great Hungarian Plain. The temporal distribution of activity values in relation to different physical parameters rules out the role of wind in the regulation of diurnal activity, but clearly demonstrates the roles of soil temperature and air temperature. On principal component analysis of potentially effective factors, 2 factors, climate and time scale, prove to be important. When represented in factorial space, the activity values of the wasp species reflect the fact that, besides the climate, the time scale corresponding to the internal clock of wasps is an important factor. This may be connected with the reproduction strategies of solitary wasps.