Results and prospects of bioindication researches of the reservoirs and channels in the Volga river basin (by the example of Chironomids, Diptera: Chironomidae)

The integrated results of long-term researches of chironomids at population (factorial ecology), biocoenosis (structurally functional characteristics of communities) and ecosystem (long-term dynamics) levels in bioindication researches of the ecological state assessment of multi-type fresh-waters in the Volga River Basin are given at different types of natural and anthropogenic impact. Chironomids fauna of the Upper Volga (Ucha channel, the Koloksha river basin), the Middle and Lower Volga (more than 40 stream and middle rivers) fresh waters is investigated for the first time. The importance of chironomids as biohindrances in the water supply plants is developed in experimental and natural conditions. The developed autecological spectrum of chironomids (ecological scales) and their distributional maps led to the creation of informative base for ecological prediction development of the rivers state, foundation of the regional criteria of the biological quality assessment in fresh waters during their monitoring. The received results allowed estimating chironomids fauna dynamics and chironomids role as indicators at conduction of large-scale monitoring reservoirs of the Volga river basin (Kuibyshev river basin, the Caspian Sea).