Study of the changes in life cycle parameters of Drosophila melanogaster exposed to fluorinated insecticide, cryolite

Abstract

The study explored variations in the life cycle parameters in Drosophila melanogaster as a function of treatment with fluorinated insecticide, cryolite. Some of the life cycle parameters considered in this study were larval duration, pupal duration, and percentage of adult fly emergence in D. melanogaster of Oregon R strain. Freshly hatched first instar larvae were transferred to different dietary concentrations of the test chemical (5, 10, 15, 20, 40, 60, 80, 100, 150, and 200 ppm). Larval duration, pupal duration, and the emergence of flies of both treated and control groups were recorded. Results obtained show a significant (p < 0.001-0.05) change in the mentioned parameters in the treated flies when compared with the controls. Interestingly, the percentage emergence of flies shows a decreasing trend along with increase in treatment concentration and almost no detectable emergence is observed in 200 ppm treatment category until the 20th day of experiment. Thus, the study indicates insecticide-induced variation in duration of different life stages and thereby suggests an effect of the fluorinated insecticide on the biology of a nontarget organism like Drosophila.