The riverine input of dissolved and suspended substances in to the Black Sea  <B>The riverine input of dissolved and suspended substances in to the Black Sea</B><P>I. Zhuravleva, N. Alexandrova and A. Morozova</B><I><P> Institute of Hydrobiology, National Academy of Sciences, Prs. Geroev Stalingrada, Kiev, Ukraine</I><P> Abstract<P> Deterioration of the Black Sea ecosystem is determinated by the great number of abiotic and biotic factors. one of them is water flow of main rivers the Black Sea basin the Danube, Dniester and Dnieper. Its summary average annual water flow reach at 260 km (Michailov, 1981). Water content, its distribution within a year and water quality influence on water quality of northwestern part of the Black Sea. Content of organic matter and nutrient in riverine input are high and resulting loads find their way to the river delta and sea. Analyze of longterm investigations data show, that water flow of the Danube, Dniester and Dnieper river is important Source entering of organic matter and nutrients into the sea. Investigations and calculations show, that the riverine input to the Black Sea contain 8146 of organic matter, 366.3 total inorganic nitrogen and 358.5 thousand tons (tt) total phosphorus per year.<P>