Tsybulskyi O. Communities of hydrobionts as indicator of environmental risks of pollution of the rivers of Ukraine

The thesis covers solution of topical tasks of the scientific substantiation of possibilities of the environmental risks determination and assessment of ecological status of the water bodies, subjected to impacts of anthropogenic factors of various power and nature. The method is based on principle of use of the hydrobiological parameters. Calculations of environmental risks were carried out in the water bodies of different types. Dynamics was determined and tendencies were revealed of changes of ecological status of the anthropogenically loaded sections of the rivers Gorun', Ustia, Styr, Bilous, Desna and Dnieper. Environmental risks of the cold waters discharge from the Dniester reservoir into the Dniester River were established and discharge of heated water of the Rivnenska NPP to Styr River. Calculated the environmental risks arising under the influence of summer overgrowing with higher aquatic vegetation in the river Pripyat. Reasonability was substantiated and confirmed of application of methodic of the environmental risks determination in the cases of uncertainties in data on ecosystems' state and incompleteness of initial data on anthropogenic impacts on them, when ecosystems' responses to such impacts are unknown and they are of stochastic nature. Based on the сalculation of environmental risk of the structural characteristics of Theodoxus fluviatilis was developed (Patent of Ukraine. Ser. МПК (2009) G01N 33/18). The methodic is used in educative process and research work of the Chernigiv state teachers'-training university (implementation act N №04-11/811 of 17.10.2007).