Laboratory-Based Estimation of Photosynthetic Performance in Dominant Macroalgal Species

E. F. Vasechkina1,*, I. P. Naumenko1, T. A. Filippova1, V. G. Shaida2

1 Marine Hydrophysical Institute of RAS, Sevastopol, Russia

2 Company “EcoService-A”, Moscow, Russia

* e-mail: vasechkina.elena@gmail.com

Abstract

The photosynthetic rate of macroalgae is well described by a logistic PE-curve, characterized by species-specific parameters (maximum photosynthetic rate, dark respiration rate, initial slope of the curve), which are primarily dependent on water temperature. The study is aimed to estimate these parameters for dominant macroalgal species under experimental conditions and to analyse their seasonal dynamics. In March and September 2024, several dominant species of brown, red and green macroalgae were sampled in the coastal waters of Sevastopol. The photosynthetic rates of the selected species were determined by the amount of released oxygen. A comparison of our results with previously published data showed that the obtained photosynthetic parameters for green algae of the genus Ulva fall within the ranges of intrageneric variability. The influence of water temperature on the photosynthetic rate was significant, with these species exhibiting considerable seasonal variation. The daily oxygen production resulting from photosynthesis in the species G. barbata and E. crinita was found to be higher than that in species from the more saline waters of the Mediterranean Sea and the North Atlantic. The obtained data provide additional information for quantitative assessments of carbon, oxygen, and nutrient fluxes in coastal ecosystems, where benthic phytocenoses play a significant role in biogeochemical processes. The results of this study can be applied in simulation models for biomass dynamics of benthic phytocenoses in the coastal zone of the Crimean Peninsula.

Keywords

photosynthesis, photosynthetic parameters, dark respiration rate, marine macrophytes, bottom phytocenosis, Black Sea, Crimean coast

Acknowledgments

The work was performed under state assignment of MHI RAS on topic no. FNNN-2024-0016 “Studies of spatial and temporal variability of oceanological processes in the coastal, near-shore and shelf zones of the Black Sea influenced by natural and anthropogenic factors on the basis of in situ measurements and numerical modelling”.

For citation

Vasechkina, E.F., Naumenko, I.P., Filippova, T.A. and Shaida, V.G., 2025. Laboratory-Based Estimation of Photosynthetic Performance in Dominant Macroalgal Species. Ecological Safety of Coastal and Shelf Zones of Sea, (4), pp. 133–146.

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