Long-term changes of bacterioplankton and clorophyll a as indicators of changes of northwestern part of the Black Sea ecosystem during the last 30 years
Kovalova, N. V.
Medinets, S. V.
Konareva, O. P.
Medinets, V. I.
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The data on many-years dynamics of bacterioplankton number and chlorophyll a concentration has indicators of the state of pelagic ecosystem of the north-western Black sea shelf (NWBS) are presented and analysed. It has been shown that in the end of the last century the quantitative characteristics of these factors grew steadily and reached the maximum values characteristic of highly eutrophic sea water in the early 90’s. From mid-90’s the trend of decrease in bacterioplankton number and chlorophyll a concentration began to slow down. At the beginning of this century their concentration was twice as low as in the years of maximum values. These changes indicate the decrease in the NWBS waters trophic level and improvement of the state of environment in the region. As a result of analysis a conclusion was made that in 1980–1990 maximum of chlorophyll a concentrations and maximum of eutrophication processes in the NWBS have been registered. It was suggested to use bacterioplankton and chlorophyll a together with nutrients furtheron as the simple indicators of marine water quality and of long-term changes in eutrophication processes in the Black sea.
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