Abstract
The effect of glyphosate herbicide at concentrations of 25, 100, 150 and 200 μg.L−1 on growth characteristics of diatoms C. caspia and T. weissflogii under accumulative growth conditions was investigated. Increasing herbicide concentration in the medium resulted in growth suppression of both species and decreased the final abundance of the cultures in the stationary growth phase. The calculated concentrations of herbicide EC10 and EC50 (10 and 90 μg.L−1 for C. caspia and 7 and 25 μg·L−1 for T. weissflogii, respectively) led to a 10 and 50% reduction in the abundance of the studied cultures relative to the control, are ecologically significant and correspond to the values recorded in aquatic areas. The combined effect of light (in the range of 20–250 µE.m−2.s−1) and glyphosate (calculated concentrations of EC10 and EC50) on the growth characteristics of microalgae was evaluated. An increase in algal sensitivity to light was observed with glyphosate exposure. In both species, the increase in the concentration of glyphosate in the medium led to a decrease in the initial angle of slope of the light curve of growth under conditions of light limitation, a reduction in the value of light saturation of growth, narrowing of the boundaries of the light optimum and an increase in the degree of light inhibition. It is shown that the effect of the combined action of light and glyphosate exceeds the sum of the effects of each factor. This fact should be taken into account in ecotoxicological monitoring when assessing the risks of glyphosate ingress into aquatic ecosystems. An increase in glyphosate concentration in water during periods with high values of solar insolation is potentially dangerous due to a decrease in the photosynthetic activity of algae and a reduction in diatom algae abundance.
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Acknowledgements
The authors thank O.S. Alatartseva, leading engineer of the algae ecological physiology department of the A.O. Kovalevsky Institute of Biology of the Southern Seas (IBSS), for providing algae cultures.
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This work was supported by the Russian Science Foundation (grant № 24-24-00269).
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Shoman, N., Solomonova, E. & Akimov, A. Combined effect of light and glyphosate herbicide on growth rate of marine diatom algae. Ecotoxicology (2024). https://doi.org/10.1007/s10646-024-02759-7
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DOI: https://doi.org/10.1007/s10646-024-02759-7