Seasonal dynamics and height of some wasp species (Hymenoptera), a study using beer traps.

In this paper, we present the results of our study on the seasonal dynamics and altitudinal distribution of Vespidae in forest ecosystems of central European Russia. To conduct this study, we utilized beer traps. Our findings include the recording of 32 species from 4 families of Hymenoptera. The most numerous family was Vespidae. The dominant species from this order were Vespula vulgaris, Vespa crabro, Dolichovespula media, and Vespula germanica. The occurrence of these species was quite high, including species from the Crabronidae, Chrysididae, and Pompilidae families. These species are known to frequently visit flowers of various plants and feed on nectar and pollen. In five different biotopes, the highest number of Vespidae was found in oak forests, while the lowest number was observed in pine forests. Vespula vulgaris was the dominant species in birch and oak forests, while Vespa crabro was more prevalent in pine and linden forests. The seasonal dynamics of the number showed a large peak in early July, likely due to a significant increase in air temperature during the day and night. This peak may have been caused by a large number of new-generation workers leaving the nests at this time. Additionally, the number of Vespidae in traps located in the undergrowth was slightly higher than those in traps in the canopy. [ABSTRACT FROM AUTHOR]