Effects of acute exposure of chlorpyrifos on the survival, morphology and swimming ability of Odontophrynus carvalhoi tadpoles
This study examines the survival, mortality, morphology and swimming ability of tadpoles exposed to the organophosphate chlorpyrifos (nominal concentrations of 10, 100, 200 e 400 Î¼g L-1) for 192 h. Odontophrynus carvalhoi tadpoles were used as a biological model. Our findings include decreased survival rates of tadpoles primarily at the highest pesticide concentration (400 Î¼g L-1) and deformities in the caudal muscles, causing spasms and tremors. Tadpoles exposed to chlorpyrifos (10 Î¼g L-1) had the lowest swimming speed compared with that of the control group. Tadpoles the other concentrations (100, 200 and 400 Î¼g L-1) were not evaluated since none of the survived 192 h exposure in concentrations above 10 Î¼g L-1. These adverse effects indicate that this organophosphate can affect the survival of tadpoles even in small doses, compromising the local population.
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