Acute Toxicity of Endosulfan to the Nontarget Organisms Hyalella curvispina and Cnesterodon decemmaculatus

HERNAN MUGNI; ARIEL PARACAMPO; PABLO DEMETRIO; SCALISE A.; MARINA SOLIS; FANELLI S.; CARLOS BONETTO

BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY

SPRINGER

Lugar: Berlin; Año: 2015 vol. 95 p. 363 - 367

0007-4861

Pesticide consumption in Argentina has steadily increased over the last two decades, while one of these compounds, namely endosulfan, is commonly found inenvironmental samples. Also the fish Cnesterodon decemmaculatus and the amphipod Hyalella curvispina are widely distributed in agricultural areas of southern South America. The aim of the present contribution was therefore to determine the acute toxicity of endosulfan to both organisms, and compare it with species sensitivity distributions (SSD) and measured field concentrations. The48 h-LC50 (with 95 % confidence limits) were 1.8 (1.6?2.1) lg/L for C. decemmaculatus and 16.4 (15.1? 17.7) lg/L for H. curvispina. C. decemmaculatus was more sensitive than 74 % of fish based on the SSD. Endosulfan concentrations in stream water reported in the literature were often higher than the C. decemmaculatus LC50. It may hence be concluded that C. decemmaculatus is a suitable sentinel organism for ecotoxicological risk assessment inSouth America.