ESTIMATION OF SPECIES DIVERSITY OF PREIMAGINAL STAGES OF BLACKFLIES (DIPTERA, SIMULIIDAE) IN STREAMS OF THE MIDDLE RUSSIAN STEPPE-FOREST
Estimation of species diversity of preimaginal stages of blackfl ies in streams was studied with various indexes. The most diversity was revealed in small rivers, least diversity was recorded in cold streams. Considerable likeness was established for species complexes of blackfl ies's preimaginal stages in small and middle rivers.