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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 11, No. 1, 2014, pp. 191-198
Bioline Code: st14020
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 11, No. 1, 2014, pp. 191-198

 en Toxicity of methyl parathion on growth and reproduction of three ecologically different tropical earthworms
Suthar, S.

Abstract

This work illustrates the toxicological impact of pesticide methyl parathion (MP) (dust—2 % active ingredient, a.i.) on growth and reproduction performance in tropical earthworms: Metaphire posthuma check for this species in other resources (endogeic), Lampito mauritii check for this species in other resources (anecic) and Allolobophora parva check for this species in other resources (epigeic). A total of three concentrations (a.i. g kg-1 dry test soil), 1.00 (T1), 1.125 (T2) and 2.25 (T3) of MP, were applied in test substrate to examine the impact on mortality, individual live weight changes and reproduction patterns in test species over 60 days under laboratory conditions. MP caused significant mortality in all tested species, and median lethal dose (LD50) for L. mauritii, M. posthuma and A. parva was 24.85, 23.64 and 22.67 mg a.i., respectively. The individual live weight loss was 27.0–37.0 % in L. mauritii, 36.0–57.1 % in M. posthuma and 1.2–11.0 % in A. parva in different test concentrations. The pesticide-exposed worms produced less cocoons than control, but in L. mauritii, an unusual reproduction (hormesis) was recorded. Results suggested the species-specific toxicity of MP against tropical earthworms.

Keywords
Ecotoxicology; Earthworm; Soil biology; Cocoon; Organophosphate pesticide

 
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