Odessa I.I. Mechnikov National University
Abstract
Purpose. To reveal seasonal changes of phytoplankton quantitative characteristics including biodiversity and species composition of potentially dangerous (toxic) species. Methods. Phytoplankton sampling in Odessa bay coastal waters and samples analyses were carried out using standard methodologies. The samples were preserved using formalin. Microscopes HUND-H600 and OLIMPUS-BH2 have been used for samples analyses. Classification of microalgae and Cyanobacteria was done according to the standards of the international database. Results. Species composition of phytoplankton comprised 258 species. It was shown that the dominant phytoplankton species were Bacillariophyceae, Dinophyceae, Chlorophyceae and Cyanobacteria. The role of other taxa was less significant and their occurrence was due to river water influence. Development of 54 phytoplankton species, which refer to the group of potentially harmful (toxic) was registered; only 12 out of their number reached blooming level. Quantitative characteristics of Noctiluca scintillans, which can significantly change the structure of Dinophyceae taxon in the periods of intensive breeding, were analysed. Conclusions. In 2016-2017, observations of phytoplankton quantitative characteristics annual cycle were performed in Odessa bay coastal waters for the first time over the past 20 years. No significant changes in microalgae taxa composition or increase in blooms frequency were revealed compared to the historical data. The quality of Odessa bay coastal waters based on the biological quality element (phytoplankton) was assessed as “Moderate” in accordance with the EU Water Framework Directive’s criteria
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References
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