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<p>The work investigates ecologically favorable areas in the lower reaches and delta of the Velikaya River, which flows into Peipsi Lake (Pskov-Chudskoe). The hydrochemical parameters, species composition and quantitative characteristics of phytoplankton were determined at 10 sampling stations, and chlorophyll fluorescence induction curves (OJIP transients) were measured. Phytoplankton at all stations was characterized by high photochemical activity of photosystem II, as determined by the chlorophyll fluorescence parameter <i>F</i><sub><i>v</i></sub><i>/F</i><sub><i>m</i></sub>. The river delta stations exhibited conditions favorable to eutrophication and heterotrophic nutrition of phytoplankton species, as well as the presence of dominant microalgae species, which were absent at other stations. The OJIP transients recorded at stations located upstream of the river delta exhibited a typical three-stage chlorophyll fluorescence rise pattern observed in higher plants and green microalgae. In contrast, the OJIP transients measured at stations in the river delta showed peculiar features, including the presence of an extra chlorophyll fluorescence maximum and a reduced IP phase. The paper examines the relationship between these atypical features of the OJIP transients and the composition of phytoplankton species, chlororespiration, non-photochemical quenching in the dark, and other processes in algae cells. Knowledge on the interpretation of the OJIP transients in phytoplankton communities can contribute to the development of low-cost express methods for bioindication of aquatic ecosystems.</p>

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Analysis of chlorophyll fluorescence induction curves (OJIP transients) of phytoplankton under conditions of high photosynthetic activity

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • T. K. Antal,
  • A. A. Volgusheva,
  • T. V. Drozdenko,
  • I. V. Konyukhov,
  • S. S. Khruschev,
  • R. N. Chervitsov,
  • T. Yu. Plyusnina,
  • G. Yu. Riznichenko,
  • A. B. Rubin

摘要

The work investigates ecologically favorable areas in the lower reaches and delta of the Velikaya River, which flows into Peipsi Lake (Pskov-Chudskoe). The hydrochemical parameters, species composition and quantitative characteristics of phytoplankton were determined at 10 sampling stations, and chlorophyll fluorescence induction curves (OJIP transients) were measured. Phytoplankton at all stations was characterized by high photochemical activity of photosystem II, as determined by the chlorophyll fluorescence parameter Fv/Fm. The river delta stations exhibited conditions favorable to eutrophication and heterotrophic nutrition of phytoplankton species, as well as the presence of dominant microalgae species, which were absent at other stations. The OJIP transients recorded at stations located upstream of the river delta exhibited a typical three-stage chlorophyll fluorescence rise pattern observed in higher plants and green microalgae. In contrast, the OJIP transients measured at stations in the river delta showed peculiar features, including the presence of an extra chlorophyll fluorescence maximum and a reduced IP phase. The paper examines the relationship between these atypical features of the OJIP transients and the composition of phytoplankton species, chlororespiration, non-photochemical quenching in the dark, and other processes in algae cells. Knowledge on the interpretation of the OJIP transients in phytoplankton communities can contribute to the development of low-cost express methods for bioindication of aquatic ecosystems.