The agricultural impact of pesticides on Physalaemus cuvieri tadpoles (Amphibia: Anura) ascertained by comet assay
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Data
2017-08
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Resumo
Amphibians inhabiting agricultural areas are constantly exposed to large amounts of chemicals, which reach the
aquatic environment during the rainy season through runoff, drainage, and leaching. We performed a comet assay on the
erythrocytes of tadpoles found in the surroundings of agricultural fields (soybean and corn crops), where there is an intense
release of several kinds of pesticides in different quantities. We aimed to detect differences in the genotoxic parameters between
populations collected from soybeans and cornfields, and between them and tadpoles sampled from non-agricultural
areas (control group). Tadpoles collected from ponds located at soybean fields had significantly more DNA damage, followed
by tadpoles collected from cornfields. In contrast, animals sampled from non-agricultural areas had the lowest incidence of
DNA damage. In addition, we found a negative correlation between the parameters of the comet assay and the area of the
ponds surrounding soybean. This correlation indicates a possible dilution effect in the concentration of pesticides. Finally,
Physalaemus cuvieri Fitzinger, 1826 seems to be a good bioindicator for detecting the genotoxic effects of field agricultural
insecticides; therefore, we suggest that this species should be used in environmental biomonitoring studies, since it is common
and abundant where it occurs.
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Amphibians, Genotoxicity, Bioindicators, Exposure, Pesticides
Citação
GONÇALVES, Macks W. et al. The agricultural impact of pesticides on Physalaemus cuvieri tadpoles (Amphibia: Anura) ascertained by comet assay. Zoologia, Curitiba, v. 34, e19865, 2017.