Acute Toxicity of Metaldehyde in the Invasive Rice Snail Pomacea canaliculata and Sublethal Effects on Tadpoles of a Non-target Species (Rhinella arenarum)

ATTADEMO A.M.,; LAJMANOVICH, R.C.,; PELTZER P.,; C. JUNGES

WATER AIR AND SOIL POLLUTION

SPRINGER

Lugar: Berlin; Año: 2016

0049-6979

We investigated the effects of exposure tomolluscicidal metaldehyde (MET) on golden applesnail (GAS) Pomacea canaliculata and Rhinellaarenarum tadpoles by assessing mortality and/orother effects via: acute toxicity assays; B-esteraseactivities (acetilcholinesterase (AChE) andcarboxilesterase (CbE)) and oxidative responses(glutathione-S-transferase (GST) and catalase(CAT)). The effect of sublethal concentrations ofMET was also analysed by assessing biochemicalchanges and swimming parameters in tadpoles. TheLC50 value in P. canaliculata was as 0.50 mg L−1and in R. arenarun tadpoles, 229.7 mg L−1 at 48 h.The intestine of MET-exposed P. canaliculata exhibiteda significant reduction in CbE and CATactivities, but not in AChE activity; hepatopancreasof GAS showed a decreased GST activity decreasedwith respect to control individuals. In addition, asignificant reduction of CbE activities was detectedin R. arenarum tadpoles exposed to MET, andAChE presented lower values than the control butwithout statistical differences. Antioxidant enzymes(GST and CAT) were significantly reduced in tadpolesexposed to MET compared with the controlgroup. In addition, MET had a significant effect onthe swimming behaviour of R. arenarum. Finally,since amphibian tadpoles and P. canaliculata oftenco-occur, other native amphibian species should bestudied to elucidate the ecological risk of MET toamphibian populations.