Comparative toxicity of endosulfan and diazinon on the embryo-larval development of the South American toad, Rhinella arenarum

CAROLINA ARONZON; GABRIELA SVARTZ; CRISTINA PÉREZ-COLL

International Journal of Environment and Health

Inderscience

Año: 2017 vol. 8 p. 225 - 234

1743-4955

The toxicity of endosulfan and diazinon were comparativelyanalysed on the early development of the South American toad,Rhinella arenarum. Pesticides varied greatly in their effects on survival,with concentration-, time- and stage-dependent sensitivity. Endosulfan was227 times more toxic than diazinon. The larval period was the most sensitivefor both pesticides (LC-504 h: 0.01 mg L?1 and 1.92 mg L?1 for endosulfan anddiazinon, respectively). Endosulfan toxicity increased 587 and 60 times fromacute to chronic exposure in treatments with embryos and larvae, respectively,while diazinon toxicity increased about four and five times, respectively.Both pesticides caused important neurotoxic effects expressed as behaviouraldisturbances. Risk evaluation assessed by hazard quotient (HQ) was over 1,the level of concern (LOC), for both pesticides at chronic exposure periods andeven at acute endosulfan exposure. Results obtained in the present study,highlight that these pesticides should be considered potential threats for thisspecies.