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Survival and cholinesterase activity of Asian common toad (Duttaphrynus melanostictus) tadpoles following short term exposure to a carbosulfan-based pesticide

Authors:

H. M. T. R. Samarakoon,

University of Kelaniya, Kelaniya, GQ 11600, LK
About H. M. T. R.
Department of Zoology and Environmental Management
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A. Pathiratne

University of Kelaniya, Kelaniya, GQ 11600, LK
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Department of Zoology and Environmental Management

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Abstract

Carbosulfan, a carbamate pesticide widely used in agriculture especially in the Asian region has received less attention in ecological impact assessments particularly to non-target amphibians. In this study, short term effects of a carbosulfan-based pesticide (Marshal®) on survival and cholinesterase (ChE) activity of tadpoles of Duttaphrynus melanostictus, a non-target amphibian in tropical Asia were evaluated. Based on the concentration-toxicity response patterns, estimated median lethal concentration (LC50) and median ChE inhibitory concentration (IC50) for 96 h were 24 and 2.1 mg/L carbosulfan respectively. For the ChE inhibition for 96 h, the lowest observable effect concentration and no observable effect concentrations of carbosulfan were 0.6 and 0.3 mg/L respectively. Upon transfer to pesticide-free water by 14 days, ChE activities of the tadpoles were restored to normal levels. Since the tadpoles exposed to 0.3 mg/L carbosulfan have not exhibited lethality, morphological deformities, abnormal behavior or statistically significant ChE depression, it is unlikely that the carbosulfan-based pesticide could induce neurotoxic effects for D. melanostictus tadpoles at the concentration of ≤ 0.3 mg/L of active ingredient under short term exposure.
How to Cite: Samarakoon, H.M.T.R. & Pathiratne, A., (2017). Survival and cholinesterase activity of Asian common toad (Duttaphrynus melanostictus) tadpoles following short term exposure to a carbosulfan-based pesticide. Sri Lanka Journal of Aquatic Sciences. 22(1), pp.29–37. DOI: http://doi.org/10.4038/sljas.v22i1.7514
Published on 01 Mar 2017.
Peer Reviewed

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