1. Шоман Н. Ю. (Shoman N.)
2. Соломонова Е. С. (Solomonova E.)
3. Акимов А. И. (Akimov A.)

Coccolithophorids play a fundamental role in the marine carbon cycle, fixing inorganic carbon during photosynthesis and exporting CO₂ during calcification. In the presented study, the toxic effect of tetracycline on coccolithophorids of Chrysotila sp. was evaluated and the possibility of removing the antibiotic from water using this microalga was investigated. Tetracycline at a concentration of 1-15 mg L⁻¹ had no effect on the growth of Chrysotila sp. and at higher values (20-25 mg L⁻¹) it stimulated the growth of the algae. As the concentration of tetracycline increased, a tendency to decrease the percentage of coccolith-covered cells in the culture was observed. At the same time, the growth of Chrysotila sp. was realized mainly at the expense of uncovered coccoliths cells, the number of covered cells changed insignificantly. Coccolith- covered and uncovered Chrysotila sp. cells showed different physiological responses to antibiotic addition. Calcified cells are more sensitive to tetracycline, which is expr

It is shown that the main mechanism of tetracycline removal from water is photodegradation. However, in the presence of Chrysotila sp. the rate of tetracycline degradation is significantly higher (by 7-15%) than in samples without algae.