Biodiversity and occurrence of cultivated cyanobacteria in bottom sediments of the black sea coast of crimea depending on physical and chemical parameters of the environment

by

N.A. Andreeva, E.A. Grebneva

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

DOI: 10.33075/2220-5861-2024-2-57-66

UDC 561.232:574.586 (262.5)                                     

EDN: https://elibrary.ru/hdwrhu

The biodiversity and distribution of representatives of cultivated cyanobacteria in samples of bottom sediments collected during expeditions off the Crimean coast of the Black Sea in different seasons of 2019–2023 were studied. Cyanobacteria belonging to five orders were found in benthic communities: Synechococcales, Chroococcales, Oscillatoriales and Nostocales, including 14 genera and several unidentified forms. Based on the results of the analysis of the frequency of occurrence of the four most common genera of cyanobacteria (Aphanothece, Synechococcus, Leptolyngbya and Nostoc) in samples of bottom sediments collected at various depths in a layer of 10–100 m, a significant positive trend was obtained for the increase in the occurrence of the genus Aphanothece, which increased during the study period from 20% to ~75% of cases. For the genus Nostoc, a positive trend for this indicator was also observed, while the occurrence of representatives of the genera Synechococcus and Leptolyngbya, on the contrary, decreased, but in these cases the trends were insignificant. Using data on bottom temperature, salinity and pH value of the near-bottom horizon from re-analyses of CMEMS BS-Biogeochemistry (BLKSEA_MULTIYEAR_BGC_ 007_005) and CMEMS BS-Currents (BLKSEA_MULTIYEAR_PHY_007_004), the optimal conditions of the marine environment for the existence and development of each of the four presented genera of cyanobacteria were determined.

Keywords. Black Sea, expeditions, bottom sediments, cyanobacteria, occurrence of cyanobacteria, pH value, temperature, salinity, re-analysis.

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