Changes in the communities of caddis fly larvae typical of various lake habitats showed a gradient-like configuration. The concomitance structure of the caddis fly fauna of the lake as a whole was marked by certain individualism. This individual character of communities was due to regional differences, the trophic differences and habitat composition of the particular lake, as well as to the close vicinity of habitats in the lakes, and most probably arose from the sharing of resources in the individually forming habitats. Five types of community were initially distinguished for the various habitats of the studied lakes, taking into consideration their regional (local) and general character.