Abstract
The impact of two organophosphorus insecticides [Chlorpyrifos (CPF) and Monocrotophos (MCP)] on non-target wild natural gastropod, Pila globosa (apple snail) from the paddy fields was studied. The activity of acetylcholinesterase (AChE) was monitored on foot-muscle and hepatopancreas tissues of control and exposed snails. In the foot- muscle AChE inhibition progressed and reached 54.19% and 63.13% of the control, whereas, the AChE inhibition in the hepatopancreas reached 46.96% and 53.67% over control after 48 hours of exposure to 1.5 mL.L-1 and 2.5 mL.L-1 CPF respectively. After 48 hours of MCP exposure at 1.5 mL.L-1 and 2.5 mL.L-1 separately, the AChE inhibition of foot muscle was 49.07% and 57.59% respectively while in hepatopancreas it was 44.65% and 48.84% respectively. Our results show more inhibition of AChE activities on the foot-muscle than hepatopancreas in a concentration and time-dependent manner with greater severity by CPF in comparison to MCP. AChE inhibition increased with the increasing exposure time.
Highlights
Today’s agricultural work is unthinkable without the use of pesticides
84 mature apple snail P. globosa, weighing 15 ± 2g were collected during monsoon from an untreated pond not having pollution history far away from the agricultural sites and subjected to experiments. 4 snails were considered as control and other 80 snails confined with nylon net was exposed in the separate paddy fields sprayed with the different concentrations of the two OP pesticides; chlorpyrifos (CPF) and monocrotophos (MCP) with the concentrations of 1.5 mL.L-1 water and 2.5 mL.L-1 water for a period of 48 hours
All chemicals used were of analytical grade purchased from The AChE activity in the foot muscle and hepatopancreas of
Summary
Today’s agricultural work is unthinkable without the use of pesticides. These widely spread pesticides are used to control agricultural pests, but at the same time, they are highly toxic to non-target natural populations in the aquatic environment. This necessitated the need to understand and evaluate the biological effects of xenobiotics on the aquatic ecosystem (Ullah et al 2018). Organophosphorus pesticides due to their lack of target specificity can cause serious, long-lasting effects on aquatic non-prey species, especially invertebrates (Wang et al 2018). An appropriate monitoring strategy is needed to measure the environmental risks and to protect the non-target organism like invertebrate species from the effects of OP pesticides
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