The caddisflies (Trichoptera) of Gorny Altai, Tuva and Northwest Mongolia
Similarity of caddisflies (Trichoptera) fauna of Gorny Altai, Tuva and Northwest Mongolia are discussed. According to Chekanovsky-Sorensen similarity index, fauna of Tuva and North Mongolia is 42 % similar, while fauna of Altai and North Mongolia is 38 %. Fauna similarity of Altai and Tuva is 43 %. At the same time, Northwest Mongolia is only 30 % similar to the Selenga River basin (North Mongolia). It can be explained by the fact that Northwest Mongolia is substantially isolated by Khangai range. It is interesting that 30 from 101 species recorded for this river basin are found only on this territory. Presented data confirm deeper caddisfly species penetration than Ephemeroptera [Zaika, 2008] in the neighboring territories during fauna formation. It can be explained by high mobility and expansion of caddisfly in comparison with Ephemeroptera.