Hydrobiological Journal

ISSN for PRINT: 0018-8166

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2001, Volume37

Issue 4

136 pages

Issue price - $369.00

T. A. Kharchenko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine

A. V. Lyashenko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine

I. Kh. Bashmakova
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine

The comparative data analysis shows that a number of important characteristics determining water quality have undergone the substantial changes in the Ukrainian part of the Danube during the second half of the 20^th century. Thus, water turbidity reduced by the factors of 1.5-2 of its former values, the index of general mineralization have increased 1.5 times, the content of organic matter in water has risen by 35-40%. As a consequence of water clarifying, the photosynthetic processes in plankton activated, and the numbers of algae and biomass are now 2-3 times and 3-7 times as great, respectively, as in the 1950s. On the background of the total twofold diminishing of bacterial numbers, the numbers of saprophytes augmented 6 times.

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