Avaliação ecotoxicológica de Fluazuron no solo: efeitos sobre a espécie "Folsomia candida"

Abstract

Fluazuron is used in the control of bovine parasites, the drug is an inhibitor of chitin synthesis in insects, highly effective in the strategic control of bovine ticks. Followingadministration of fluazuron in animals, high levels of excretion of the active ingredient (i.a.) in its unchanged form may occur through faeces and urine, constituting a potential contaminant of the soil. When deposited in the soil, xenobiotics (example fluazuron) may cause adverse effects on fauna and, consequently, ecosystem services associated with it. The present work had the objective of evaluating the impacts of the acaricide fluazuron on a species of invertebrates of the fauna of the soil. For this, terrestrial ecotoxicological tests were carried out in order to determine the impacts of the use of this drug on the survival, reproduction and behavior of Folsomia candida. The tests were carried out in Tropical Artificial Soil (SAT), in a laboratory with controlled temperature and luminosity conditions. Collembolans were exposed to concentrations of 0.5; 1.0; 3.0; 5.0 and 10.0 mg of fluazuron kg-1 dry soil, as well as two controls: deionized water and solvent (acetone). Negative effects on collembolans reproduction were verified from the concentration of 5.0 mg kg-1 . In addition, it was verified that the organisms had an avoidance behavior of contaminated soils with all the concentrations tested, being estimated a value of AC50 (Concentration that causes a 50% leakage of organisms) equal to 1.78 mg kg-1 . The results showed negative effects on the reproduction and behavior of the exposed fluazuron collembolans in artificial soil, evidencing the toxic potential of the drug on edaphic organisms.