Medinets, Volodymyr I.Dereziuk, Nataliia V.Kovalova, Nataliia V.Medinets, Sergiy V.Медінець, Володимир ІвановичМединец, Владимир ИвановичМедінець, Сергій Володимирович2012-06-112012-06-112011-11Materials of the 3-rd Bi-annual BS Scientific Conference and UP-GRADE BS-SCENE Project Joint Conference. Odessa, Ukraine, 1 – 4 November 2011. P. 52-53https://dspace.onu.edu.ua/handle/123456789/2536Planktonic microorganisms form the basis of marine biocoenosis, at that, being the initial link of trophic system. It is known, that phytoplankton blooms, including development of potentially toxic micro-algae (PTM) are the evidences of abnormalities in functioning of ecosystem, and not only bring down the quality of water, but also cause death of bottom-dwelling organisms and fish due to algotoxins. In the recent years micro-algal blooms, including PTM, in the Black and Azov Seas are occupying the first place among other environmental problems. Objective of this work is analysis of dynamics of PTM development in the North-Western Black Sea (NWBS), in particular in the Zmiinyi Island area during past twenty years.enZmiinyi Island AreaBlack SeaToxic Algaetrophic statetransparencysalinityTRIXchlorophyll “a”bacterioplanktonArticle