Structure of the rheophil communities of the acrozoobenthos in the small river Bajtugan (the Lower Volga basin)

Structural changes of bottom-communities (species, trophic structure) should be considered as effective assessment mechanism of the small river Bajtugan (inflow of the river Sok, basin of the Lower Volga) for a waterway qualification as a standard water object. There were held the researches of the macrozoobenthos and its distribution in a river continuum. There were marked new dipteran species which are very rare for the reservoirs of the Volga river basin. There was given the assessment of the water quality and waterway ecological condition using various methods of hydroecological analysis.