Interannual Variability of Physical and Biological Characteristics of Crimean Shelf Waters in Summer Season (2010–2020)

S. A. Piontkovski1, *, Yu. A. Zagorodnyaya2, I. M. Serikova2, I. A. Minski1, 2, I. V. Kovaleva2, E. Yu. Georgieva2

1 Sevastopol State University, Sevastopol, Russia

2 A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russia

* e-mail: spiontkovski@mail.ru

Abstract

The coastal zone and shelf of Crimea are the objects of long-term comprehensive research predetermined by the significant role these zones play in the economic life of the peninsula. The purpose of the research is to identify trends in inter-annual variability in the structural and functional characteristics of the pelagic community. Data on remote sensing (from satellites), in situ measurements (on board a research vessel) and computed parameters were employed to identify the variability of physical and biological characteristics of the Crimean shelf waters from 2010 to 2020. It was shown that after the environmental cataclysms of the 1990s, associated with shelf eutrophication and trophic impact of plankton invasive species, the planktonic community entered a period of relative stability. The inter-annual variability of its key structural and functional characteristics (namely, phytoplankton biomass, the intensity of its bioluminescence, zooplankton biomass, net primary production and the ratio of production to biomass) could be characterized rather by inter-annual fluctuations due to hydrophysical dynamics than statistically significant trends of long-term variability. The hydrophysical dynamics was assessed by two parameters: the kinetic energy density and cross-shelf mass transfer in the upper layers.

Keywords

phytoplankton, zooplankton, bioluminescence, pollution, sea surface temperature, Black Sea

Acknowledgments

The work was funded by the Russian Science Foundation (grant no. 23-24-00007), state assignment no. 121040600178-6 (“Structural-functional organization, productivity, and stability of marine pelagic ecosystems”), no. 121030100028-0 (“Trends of formation and anthropogenic transformation of biodiversity and bioresources of the Azov-Black Sea basin and other regions of the World’s Ocean”), no. 121041400077-1 (“Functional, metabolical, and toxicological aspects of hydrobiont and their population persistence across biotopes with different physical-chemical mode”), and state assignment to SevSU no. FEFM-2023-0005. The expeditions were carried out onboard R/V Professor Vodyanitsky. The authors are grateful to A. Akpinar (Middle East Technical University, Turkey) for the water mass transport data, to V. V. Suslin for the data for primary production calculation, to V. V. Gubanov for gelatinous macrozooplankton data, and to A. N. Korshenko for oil hydrocarbon data.

For citation

Piontkovski, S.A., Zagorodnyaya, Yu.A., Serikova, I.M., Minski, I.A., Kovaleva, I.V. and Georgieva, E.Yu., 2024. Interannual Variability of Physical and Biological Characteristics of Crimean Shelf Waters in Summer Season (2010–2020). Ecological Safety of Coastal and Shelf Zones of Sea, (2), pp. 39–59.

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