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August 20, 2026Functional Plant Biology

Daily dynamics of phytoplankton photosynthetic parameters in the surface layer

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Authors

NMNataliya MoiseevaTCTanya ChurilovaTETatiana Efimova

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Overview

Observational study reveals diurnal shifts in surface phytoplankton photosynthetic parameters, indicating reliable models for calculating daily average quantum yield.

Key Points

  • To analyze diurnal variations in photosystem II maximum quantum yield and light saturation coefficients relative to solar radiation to optimize daily quantum yield estimations in surface phytoplankton.
  • Monitored surface-layer photosynthetically available radiation (PAR), photosystem II maximum photochemical quantum yield (Fv/Fm), and light saturation coefficients (Ik) across daily cycles in the Black Sea on June 11 and 20, 2024.
  • Evaluated three computational models reconstructing daily average quantum yield based on reference-time (t0) parameter sampling and daily solar dynamics.
  • Midday Fv/Fm decreased by 10% on June 11 and 50% on June 20, 2024, whereas Ik increased twofold and threefold on the respective dates.
  • Ik daily dynamics showed the highest retrieval accuracy when reference-time measurements were sampled close to midday peak values.
  • All three retrieval approaches accurately estimated daily average quantum yield throughout daytime hours, with limitations occurring only during early morning and late evening.

Cite This Study

Moiseeva et al. (2026) studied this question.

synapsesocial.com/papers/6a86b5eb8a91293e6a1cd8dchttps://doi.org/10.1071/fp25270
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