ASSESSMENT OF LEVEL OF WATER ECOSYSTEM AND ITS STATE ON THE BASIS OF ANALYSIS OF STRUCTURE OF PHYTOPLANKTON AND A MICROPHYTOBENTHOS

The conducted researches of taxonomical structure of phytoplankton and microphytobenthos of neopleistocene and modern water ecosystems of the center of the East European Plain allowed to reveal regularities of its change when changing natural and natural and anthropogenic conditions and also parameters of its environmental standard. It is offered at a research of the modern water ecosystems by method of graphic comparison of taxonomical proportions of phytoplankton and a microphytobenthos to consider all groups of microalgas and a cyanobacterium, and not just diatomic. Researches showed prospects of use of this approach for assessment of a condition of water ecosystems and level of the loading rendered on them. The threshold sizes of indexes of a water ecosystem reflecting its transition from one state to another and also change of level of load of it are quantitatively determined.