Fauna and ecology of Hymenoptera background species of terrestrial ecosystems in the Yenisei Siberia tundra and forest-tundra
This paper presents materials on the ecology and faunistic composition of four species of Hymenoptera: Urocerus gigas L., 1758; Vespula vulgaris L., 1758; Bombus polaris Curtis, 1835; Bombus hyperboreus Schonherr, 1809. Their number was calculated for 20172019, data on population density, seasonal activity and forage plants of Hymenoptera adults in the tundra and forest-tundra of Yenisei Siberia are presented. As a result of calculating in both natural conditions, numerous species are true wasps and bumblebees and the large horntail is a rare species and was recorded only in the forest-tundra. When studying the food base of the studied species, it was noted that Vespula vulgaris was most often found on the forest bellap Anthriscus sylvestris L., in thickets of willow shrubs, Salix polaris Wahlenb. Adult insects Urocerus gigas were found mainly on Siberian larch Larix sibirica L. and alder forest Alnus fruticosa Rupr. Individuals of Bombus polaris and Bombus hyperboreus were recorded on horned dandelion Taraxacum ceratophorum L., narrow-leaved fireweed Chamerion angustifolium L., common tansy Tanacetum vulgare L.