Joint toxicity of copper and diazinon during embryonic and larval development of the common South American toad, Rhinella arenarum

CAROLINA ARONZON; GABRIELA SVARTZ; CRISTINA PÉREZ-COLL

CHEMISTRY AND ECOLOGY

TAYLOR & FRANCIS LTD

Lugar: Londres; Año: 2016

0275-7540

Copper (Cu) and diazinon are two widely distributed pollutants; theycoexist in agro-ecosystems and cause toxicity to wild biota. Thisstudy proposes to analyse the joint toxicity of binary mixtures ofCu and diazinon on the early development of the South Americantoad, Rhinella arenarum by means of a standardised test. Cu wasalways more toxic than diazinon. Cu was more embryotoxic whilethe pesticide was more toxic during the larval exposure thanduring the embryonic period. The different Cu/diazinon mixturesproportions assayed were significantly less toxic than expected byadditive effects. Thus, an antagonistic interaction pattern wasobserved. This pattern was independent of the assayedproportion, the exposure times and the exposure developmentalperiods. In the risk assessment analysis to establish water qualitycriteria, the joint toxicity should be considered at different ratios,exposure time and life period for a certain species, in order topreserve wild species.