Abstract
Using the electron microscopy method, the species identity of the diatom Cerataulina pelagica, isolated in pure culture from the coastal waters of the Black Sea in September 2021, has been confirmed. The range of optimal temperature values for the development of this species is identified. The impact of light and biogenic substances on its main structural and functional characteristics has been studied. The acclimation of C. pelagica to various light intensities is carried out by changing the efficiency of photosystem II, the C/Chl a ratio, and the specific growth rate. The morphometric parameters of cells (volume, surface area, and specific surface area) change slightly in the studied light range: 8.5–510 μE/(m2 s). The transfer of C. pelagica cells, which have the maximum intracellular pool of nutrients, to seawater depleted in nutrients causes a rapid increase in the C/Chl a ratio, as well as a decrease in the efficiency of photosystem II, the relative rate of electron transport, and the specific growth rate. A high degree of toxicity with copper ion in low concentrations in relation to the studied species is shown.
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ACKNOWLEDGMENTS
I thank I.I. Babich and E.O. Verezubova (staff at the Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences) for their invaluable assistance in this study, as well as V.N. Lishaev, lead engineer at the Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, for conducting the electron microscopy.
Funding
This work was carried out based on the State Task of the Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, “Functional, Metabolic and Toxicological Aspects of the Existence of Hydrobionts and Their Populations in Biotopes with Different Physicochemical Regimes” (no. 121041400077-1).
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Translated by V. Mittova
Abbreviations: Chl a, chlorophyll a; PAR, photosynthetically active radiation; Pheo a, pheophytin a; ETR, electron transport rate; Fm, Fv. maximum and variable fluorescence of dark-adapted samples; F 'm, Fv, maximum and variable fluorescence of samples adapted to light; Fv/Fm, maximum efficiency of photosystem II; F 'v/F 'm, efficiency of photosystem II at different light intensities; l, light intensities; and OD750, optical density at a wavelength of 750 nm.
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Stelmakh, L.V. The Influence of Abiotic Factors on the Structural and Functional Characteristics of the Diatom Algae Cerataulina pelagica (Сleve) Hendey. Inland Water Biol 16, 209–218 (2023). https://doi.org/10.1134/S1995082923020207
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DOI: https://doi.org/10.1134/S1995082923020207