Багаторічні зміни біомаси Noctiluca scintillans ((Macartney) Kofoid & Swezy, 1921, Dinophyceae, Noctilucales) в Одеському та Дунайському районах Чорного моря як показника якості водного середовища

Abstract

Water quality assessment is a key task of any measures in the field of water use, environmental managementand environmental protection. Zooplankton organisms are sensitive to changes in the environment and can be usedas indicators of the ecological status of aquatic ecosystems. One such organism is the heterotrophic dinoflagellateNoctiluca scintillans (Macartney) Kofoid & Swezy, 1921, Dinophyceae, Noctilucales. N. scintillans is a componentof the mesozooplankton of the Black Sea, which is not part of the forage base of planktophagous fish and is characterizedby a short life cycle. Due to this, it has an advantage in eutrophic conditions and can be used as an indicator of increasingtrophic levels of the reservoir. To determine the quality of the studied waters of the Black Sea was used the biomassindex of N. scintillans (%) of the total biomass of zooplankton. In the period from the 1970s (hypertrophication period)to 2010, the% of N. scintillans biomass from the total biomass of zooplankton in the Black Sea decreased annually from60% to 10% in Odessa region (Dnipro-Bug region) and from 90 % to 15% in the Danube region. Such changes indicatea decrease in the impact of the negative eutrophication factor and indicate positive changes in the feed base of industrialfish planktophages and the ecological status of the Black Sea. Ecological quality status (GES/NotGES) was determinedin the following regions of the Black Sea: the north-western Gulf of the Black Sea, the deep-water shelf, the shelf areaand the Danube Avandelta. “Good” ecological status (GES) % N. scintillans of total zooplankton biomass was observedin all research areas of the north-western part of the Black Sea, as the percentage of N. scintillans of total biomass didnot exceed 30%.