Articles
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
A. Pathiratne
University of Kelaniya, Kelaniya, GQ 11600, LK
About A.
Department of Zoology and Environmental Management
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. and 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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