Abstract
The aim of paper is estimation of interconnections of the Danube River runoff, physical-chemical and phytoplankton characteristics in the north-western part of the Black Sea on the example of the Zmiinyi Island coastal waters. Material for analysis comprised results of hydrological and hydrochemical characteristics of marine environment, photosynthetic pigments concentration and phytoplankton species composition, which have been measured every decade in one point of coastal waters of Zmiinyi island. The results of statistical analysis of the data for 2004-2014 on the coastal waters of the Zmiinyi Island located in the north-western Black Sea 40 km far from the Danube Delta have been considered and analysed in the article. It has been shown that the state of phytoplankton community characteristics is mostly influenced by salinity, transparency and nitrate content, whose levels are formed under the influence of the Danube water runoff. Analysis of phytoplankton community characteristics depending on three types of water masses has shown that the highest values of biomass and abundance, both in general for phytoplankton and for its separate taxonomic groups have been registered in water masses having salinity from 10 to 14‰ formed under the Danube runoff influence.
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