Metabolic stress and shell thinning in Pomacea canaliculata (Caenogastropoda, Ampullaridae) in rice agroecosystems of Argentina

ATTADEMO A.M.,; TAMBURI N; PELTZER P.,; LAJMANOVICH, RAFAEL C; CANDELA MARTINUZZI

Current Topics in Toxicology

Agricultural Sciences

Año: 2018 vol. 14-5 p. 53 - 65

0972-8228

Pomacea canaliculata is a freshwater snail nativeto South America that has become a serious pest ofrice crops. Insecticides are used to control other pestsin paddy fields and P. canaliculata is collaterallyexposed. Here a P. canaliculata population from arice field (RF) where the insecticides bifenthrinand imidacloprid (IMC) were applied was comparedwith a reference site (RS). The activities of threemetabolic endpoints, namely acetylcholinesterase(AChE), carboxylesterase (CbE) and glutathione-S-transferase (GST) were measured to test metabolicstress. Intestine and midgut-gland of snails after7 and 30 days of insecticide application were studied.A possible effect of IMC on shell thickness wasalso explored. The results indicate an inhibition ofCbE and GST activities in the intestine of RF snailsrelative to RS snails at 7 days, while AChE and GSTincreased in the intestine after 30 days of IMCexposure. GST in the midgut-gland of RF snailswas inhibited with respect to RS snails at 7 and30 days, whereas CbE increased at 30 days in RFsnails. Thinner shells with lower proportion of ashcontent were observed in snails from RF. Exposureto pesticides exerts neurotoxic resistance and oxidative stress in P. canaliculata and is probably responsiblefor the alteration in the shell development.