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Long-term dynamics of organic matter and nutrients in the closing-reservoirs of the Volga cascade in the period 2004–2014 were studied. This period was characterized by changes in climatic conditions: reduce of rainfall, increase of summer temperatures, the negative trend in water discharge of the Volga River with the pattern of decline in indicators of water availability and floods. Organic matter and nutrients can be considered as the basic *Автор-корреспондент / Corresponding author Е.А. Шашуловская и др. 368

Hydro-chemical basis of biological productivity in the closing reservoirs of the Volga cascade