alexa Biomarker Response and Biomass Toxicity of Earthworms A
ISSN: 2161-0525

Journal of Environmental & Analytical Toxicology
Open Access

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Research Article

Biomarker Response and Biomass Toxicity of Earthworms Aporrectodea caliginosa Exposed to IGRs Pesticides

Hoda M Nasr1* and Mohamed EI Badawy2
1Department of Plant Protection, Faculty of Agriculture, Damanhour University, Damanhour, Egypt
2Department of Pesticide Chemistry and Technology, Faculty of Agriculture, Alexandria University, El-Shatby, Alexandria, Egypt
Corresponding Author : Hoda M. Nasr
Department of Plant Protection
Faculty of Agriculture
Damanhour University, 22516, Damanhour, Egypt
Tel: 01222237641
Fax: 033923345
E-mail: [email protected]
Received: September 02, 2015 Accepted: October 31, 2015 Published: November 03, 2015
Citation: Nasr HM, Badawy ME (2015) Biomarker Response and Biomass Toxicity of Earthworms Aporrectodea caliginosa Exposed to IGRs Pesticides. J Environ Anal Toxicol 5:332. doi:10.4172/2161-0525.1000332
Copyright: ©2015 Nasr HM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Earthworms play key roles in soils and sub lethal effects of environmental toxicants on these organisms should be taken seriously, since they might have detrimental effects on higher ecological levels. In laboratory experiments, we have assessed to investigate the toxicity of two insect growth regulators (IGRs) flufenoxuron and pyriproxyfen at different application rates and exposure times against mature stage earthworms Aporrectodea caliginosa. The effects of these pesticides on the growth rate in relation to the activities of acetylcholinesterase (AChE), polyphenol oxidase (PPO) and glutathione S-transferase (GST) as biomarker indicators were evaluated to elucidate the mechanisms of action. Toxicity studies indicated that pyriproxyfen was more harmful to mature earthworms than flufenoxuron with LC50=42.63 and 60.66 mg/kg after four weeks, respectively. The reduction in growth rate of all pesticide-treated worms was dosedependent over the 28-day exposure period which was accompanied by a decrease in AChE, PPO and GST activities. Relationships between growth rate and enzyme activities provided strong evidence for the involvement of pesticidal contamination in the biochemical changes of earthworms, which can be used as a bioindicator of soil contamination by pesticides.

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