BUMBLEBEES AND CUCKOO-BUMBLEBEES (Apiformes: Bombini) OF UNDERGROWTH AND GRASSLAND – HERBS FOREST ENVIRONMENTS IN THE TERRITORY OF THE ŒWIÊTOKRZYSKI NATIONAL PARK

cuckoo-bumblebees (Bombini) were studied on 13 sites in the Œwiêtokrzyski National Park. The study aimed at presenting the dynamics of the community structure of these insects in anthropogenically differentiated forest communities of the Park. In total, 11 species of bumble-bees (Bombus Latr.) and five species of cuckoo-bumblebees (Psithyrus Lep.) were recorded in the study area. Bombus pascuorum (Scop.), B. lucorum (L.), B. pratorum (L.), Ps. bohemicus (Seidl.), Ps. campestris (Pz.) and Ps. rupestris (F.) were the most frequently recorded species. Those were also the dominating species in the study area. The average density of insects was the highest in Bombini communities of semi-natural and segetal habitats, and the evenness index J’ reached the highest parameters (0.4) in the assemblage of Bombini communities of segetal habi-tats. The species and quantitative similarity of the structure of insects ’ communities decreased starting from natural environments, through semi-natural towards segetal and ruderal environ-ments