Effect of Water Pollution with Oil on Delayed Fluorescence of <i>Chlorella vulgaris </i>Beijer Algae and Survival Probability for <i>Daphnia magna</i> Str.
Effect of different oil concentrations in aqueous medium on chlorella alga and daphnia was studied in laboratory experiments. It was shown that with an increase in oil content in water, the intensity of delayed fluorescence of the test culture of chlorella and the survival probability of daphnia decrease. However, for chlorella, a decrease in fluorescence as an index of its photosynthetic activity is observed only for very high oil concentrations (1000-2000 MPC), while for daphnia the survival probability decreases starting from 4 MPC. A similar dependence is also observed when sunflower-seed oil imitating oil pollution is introduced into the medium. It is assumed that the negative effect of oil on microalgae and daphnia is due to physical factors rather than chemical ones.