A study of the Chironomidae (Diptera) of the Lower Volga river region and the Northern Caspian sea and their long-term biomass’ dynamics

There are given the results of taxonomical structure of chironomids in waterways of The Lower Volga river region and the Northern Caspian Sea during various periods of 1981-1995. Long-term dynamics of the chironomids' biomass in the Northern Caspian Sea from 1948-2000 is shown. Data of reconnaissance researches prove the lack of modern representation of the structure of chironomid fauna in natural habitats. Extensine use of Chironomidae in monitoring of The Lower Volga river region and the Northern Caspian Sea is consistent with the abundance and taxa richness of this group in natural habitats.