[Faunistic complexes and changes in species composition of horseflies (Diptera: Tabanidae) recorded during 1950-2009 in the forest zone of Omsk region].

Faunistic study of horseflies was performed during 2007-2009 in forest zone of Omsk region; 6206 horsefly specimens from 27 species were collected. Taking into consideration the collections of Tabanidae made by Alifanov and Rastegaeva during the 1950s, 30 species of horseflies are present in the territory under consideration. The species of Tabanidae characteristic for European steppe and European forest zone were found to be dominants; the species of Siberian taiga zone were rather numerous; representatives of Far Eastern forest faunistic complex occurred sporadically. In comparison with 1950s, the pattern of domination of the horsefly fauna has been changed. Hybomitra montana montana, H. nitidif ronts, and Tabanus miki left the group of dominants, while H. muehlfeldi, which was not recorded previously, became numerous, and the abundance of H. ciureai is significantly increased.