GENERALIZED RESULTS OF THE INVESTIGATION OF THE INFLUENCE OF IMIDACLOPRID-BASED INSECTICIDES ON <i>DAPHNIA MAGNA</i>
Insecticide imidacloprid is the second most widely used pesticides worldwide. Several researchers have dis- covered its presence in the aquatic environment that constituting a risk to aquatic animals. The aquatic organ- isms, including the invertebrates, are used worldwide for ecological biomonitoring. They are considered as ex- cellent models indicating environmental problems. Daphnia magna are one of the most demanded for ecotoxi- cology species. The biological and populational effects of various concentrations of imidacloprid on newborn and mature individuals of D. magna were investigated in the present study. Acute toxicity was observed in the concentration range from 3.0×102 mg/l to 3.0×10-7 mg/l. Vital, lethal and the mean lethal concentrations were es- tablished. Chronic toxicity was studied for the concentrations of 3.0×10-1, 3.0×10-2, 3.0×10-7 mg/l. Fecundity, the day of the first reproduction, and body size were also registered. A damaging effect of imidacloprid on the early development of D. magna was revealed. This effect manifested as the inhibition of oocytes’ growth, abnormal functioning of the intestine, the retardation of body growth, the decrease of population growth rate, and some pathological changes in tissues.