Hover Fly Fauna (Diptera, Syrphidae) of Karaginskii Island (the Bering Sea)

摘要

The hover fly fauna of Karaginskii Island, located in the southwestern part of the Bering Sea near Kamchatka Peninsula, was investigated. A total of 39 species belonging to 22 genera were found on the coastal plain covered with the shrub tundra and meadows of various types. Cheilosia with 7 species was the most diverse genus in the fauna. The chorological structure of the fauna has a typical boreal pattern being dominated by widespread species (77% of the fauna), whereas the fraction of arctoboreal species is distinctly smaller (8%). The subspecies Cheilosia illustrata magnifica, one of the dominants in the hover-fly community (9%), was a single subendemic element of the fauna.