Abstract
The article presents research results of taxonomic composition and quantitative development of the phytoplankton in area of Novorossiysk port and in the open part of the bay for the period of May-September 2018. In total 52 species of the phytoplankton were found. Coefficient of flora similarity in 2017 and 2018 was 62%. Average values of abundance and biomass in the port were 190 thousands cell/L and 250 mg/m3 , in the open areas of the Novorossiysk bay – 266 thousands cell/L и 303 mg/m3 . Dominated in the study area was Bacillariophyta – 70–58 % of the total abundance and 78–75% of the phytoplankton biomass. The small mesosaprobic species diatoms (Thalassionema nitzschioides, Leptocylindrus minimus, Chaetoceros compressus), Euglenophyta (Euglena sp.), Cryptophyta (Plagioselmis punctata) developed significantly in the port. The Chrysophyta (Emiliania huxleyi) and diatoms Proboscia alata и Pseudosolenia calcar-avis prevailed in the open area of the bay
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