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Finenko Z. Z., Mansurova I. M., Kovalyova I. V., Georgieva E. Yu. Development of phytoplankton in the winter-spring period in the coastal waters of Crimea. Marine Biological Journal, 2021, vol. 6, no. 1, pp. 102-114. https://doi.org/10.21072/mbj.2021.06.1.08

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Abstract

The analysis of phytoplankton in the winter-spring period is important for investigating peculiarities of its annual dynamics and the Black Sea ecosystem overall functioning. Phytoplankton state in the winter-spring period in the Black Sea shelf zone is less studied than that of the summer-autumn season; conducting such a research is especially important for solving several problems, related to the productivity of the last links of the food chain, the formation of water hydrochemical regime, and the carbon cycle in the sea. The aim of the work is to assess the effect of seasonal conditions on the development of phytoplankton and its production estimates in the winter-spring period in the coastal waters of Crimea. The article presents the results of studies of hydrophysical (water temperature, density, and relative transparency) and biological indicators (chlorophyll a concentration, its fluorescence, taxonomic composition, and phytoplankton production estimates) in the Black Sea shelf zone in January – April 2016–2019. The studies were carried out at 50 stations, located in the coastal waters of Crimea from the Karkinitsky Bay to the Kerch Strait. Chlorophyll a concentration was measured by the standard fluorometric method, species composition was determined by microscopy, and phytoplankton specific growth rate was calculated according to the previously developed model. In winter (January – February), the values of chlorophyll a content and upper mixed layer depth were the highest (0.42–0.52 mg·m−3 and 44–58 m, respectively); in spring (March – April) they were 2–3 times lower. In January – February, the coccolithophore species Emiliania huxleyi (Lohmann) W. W. Hay & H. P. Mohler, 1967 predominated; in March – April, in different years, either dinoflagellates and diatoms or coccolithophores, dinoflagellates, and diatoms prevailed. In winter, chlorophyll a vertical distribution at most stations was uniform; in spring, unimodal profiles with a depth maximum prevailed, the location of which was not related to temperature and density gradients. Relative changes in chlorophyll a concentration and fluorescence with depth were usually the same. Phytoplankton production and daily production/biomass ratio (P/B) increased from winter to spring. There was no correlation between the values of integral production, biomass, and maximum specific growth rate of algae. Maximum specific growth rate was the least variable indicator. During the winter-spring period, algae in the photosynthetic zone divided on average once every 2–5 days.

Authors

Z. Z. Finenko

chief researcher, D. Sc.

https://orcid.org/0000-0003-4852-341X

https://elibrary.ru/author_items.asp?id=744590

I. M. Mansurova

junior researcher

https://orcid.org/0000-0003-1197-0339

https://elibrary.ru/author_items.asp?id=999258

I. V. Kovalyova

researcher, PhD

https://orcid.org/0000-0001-5430-2002

https://elibrary.ru/author_items.asp?id=1039761

E. Yu. Georgieva

leading engineer

https://orcid.org/0000-0002-8177-0781

https://elibrary.ru/author_items.asp?id=951670

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Funding

This work has been carried out within the framework of IBSS government research assignment “Functional, metabolic, and toxicological aspects of hydrobionts and their populations existence in biotopes with different physical and chemical regimes” (No. АААА-А18-118021490093-4), as well as within the framework of the RAS project “Influence of physical and chemical processes on the change in species composition and productivity of marine phytoplankton” (No. АААА-А18-118020790209-9).

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