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Efimova T., Churilova T., Moiseeva N., Skorokhod E., Salyuk P., Yatsuk A. Phytoplankton photosynthetic parameters in waters near the Kamchatka Peninsula in August–September 2023. Marine Biological Journal, 2026, vol. 11, no. 2, pp. 67-84. https://doi.org/10.21072/mbj.2026.11.2.05

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Abstract

The climate change and increasing anthropogenic load affect the aquatic ecosystems. State and productivity of pelagic ecosystems are largely determined by photosynthetic capacity of phytoplankton. The aim of this work was to analyze the variability of phytoplankton photosynthetic parameters [quantum yield of photosynthesis (ϕ) which characterizes efficiency of absorbed light quanta utility in photosynthesis, its potential capacity (ϕmax), and light-saturation coefficient (Ik)] depending on light conditions, which are determined by the ratio of thickness of the upper mixed layer (UML) to the depth of the euphotic zone (Zeu). The study covered data obtained in the Pacific Ocean and the Sea of Okhotsk during the cruise 23/4 of the RV “Professor Multanovskiy” in August–September 2023. Parameters ϕmax and Ik were calculated based on measurements of rapid light–response curves of variable fluorescence. As found out, variability in photosynthetic parameters was mainly determined by phytoplankton physiological acclimation to light. Importantly, acclimation to light, which differed between the UML and the deeper layer of the Zeu, resulted in distinct light–response patterns of relative electron transport rate curves. The values of Ik were directly related to light intensity. Nonetheless, the values of ϕmax were inversely related to light intensity, but to a larger extent than the values of Ik. As a result, ϕ, which depends on Ik and ϕmax, dropped with increasing light intensity. A tight relationship between the values of ϕ and light intensity (r = 0.97) was revealed (p < 0.0001), and it was described by an exponential function. This analysis showed peculiarities of the light forcing variability in photosynthetic parameters. The revealed dependences of Ik, ϕmax, and ϕ on light intensity can be used for express assessment of their values based on light; this is necessary for analysis of primary production involving spectral approach.

Authors

T. Efimova

senior researcher, PhD

https://orcid.org/0000-0003-3908-4160

https://elibrary.ru/author_items.asp?id=766926

T. Churilova

leading researcher, PhD

https://orcid.org/0000-0002-0045-7284

https://elibrary.ru/author_items.asp?id=888565

N. Moiseeva

researcher

https://orcid.org/0000-0003-1356-7981

https://elibrary.ru/author_items.asp?id=959717

E. Skorokhod

researcher

https://orcid.org/0000-0002-3057-3964

https://elibrary.ru/author_items.asp?id=1034485

P. Salyuk

head of the library, PhD

https://orcid.org/0000-0002-3224-710X

https://elibrary.ru/author_items.asp?id=155615

A. Yatsuk

leading researcher, PhD

https://orcid.org/0000-0003-3975-5438

https://elibrary.ru/author_items.asp?id=619393

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Funding

The application of chlorophyll a fluorescence measurements for the assessment of phytoplankton photosynthetic characteristics was carried out within the framework of IBSS state research assignment No. 124030100106-2. Analysis of light-dependent variability in photosynthetic characteristics of phytoplankton was funded by the Ministry of Science and Higher Education of the Russian Federation, project No. FZNS-2024-0037 “Integrated environmental monitoring of coastal marine and terrestrial ecosystems of Kamchatka.” In situ measurements of chlorophyll a fluorescence were performed within the framework of POI FEB RAS state research assignment No. 124022100080-0.

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