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The aim of this research was to investigate the process of colonization in wooden nest boxes for birds by the wasp Dolichovespula saxonica [F.] in the forest reserve “Las Piwnicki” during 1986-1987. About 69% of 150 nest boxes were colonized (36% by D. saxonica) in 1986 and 35% (10% by D. saxonica) in 1987. Parasite Shecophaga vesparum Court was observed inside small cell nests (SC) and large cell...
Structural dynamics of bee communities was described in the heath area subject to succession of coniferous forest Peucedano-Pinetum. As pine trees successively overgrew the area, two-threefold decrease in the number of species was observed. Flowering of heather increased the food attractiveness of the heath for species of social bees. Stabilization of the structure of bee communities in the heath...
The structure of the social wasp communities was studied in the forest areas of the Karkonosze Mts. transformed by acid rains in 1989 and 1994. A significant increase of species diversity (H') was observed in the season of the even year, which resulted from the increased competing interactions between queen mothers. Whereas the distribution of the species' number decreased together with the altitude...
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