Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 495185
Title Lethal and sub-lethal effects of five pesticides used in rice farming on the earthworm Eisenia fetida
Author(s) Rico, Andreu; Sabater, Consuelo; Castillo, María Ángeles
Source Ecotoxicology and Environmental Safety 127 (2016). - ISSN 0147-6513 - p. 222 - 229.
DOI https://doi.org/10.1016/j.ecoenv.2016.02.004
Department(s) Alterra - Environmental risk assessment
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Biomarkers - Eisenia fetida - Histological examination - Pesticides - Terrestrial ecotoxicology
Abstract

The toxicity of five pesticides typically used in rice farming (trichlorfon, dimethoate, carbendazim, tebuconazole and prochloraz) was evaluated on different lethal and sub-lethal endpoints of the earthworm Eisenia fetida. The evaluated endpoints included: avoidance behaviour after an exposure period of 2 days; and mortality, weight loss, enzymatic activities (cholinesterase, lactate dehydrogenase and alkaline phosphatase) and histopathological effects after an exposure period of 14 days. Carbendazim was found to be highly toxic to E. fetida (LC50=2 mg/kg d.w.), significantly reducing earthworm weight and showing an avoidance response at soil concentrations that are close to those predicted in rice-fields and in surrounding ecosystems. The insecticide dimethoate showed a moderate acute toxicity (LC50=28 mg/kg d.w.), whereas the rest of tested pesticides showed low toxicity potential (LC50 values above 100 mg/kg d.w.). For these pesticides, however, weight loss was identified as a sensitive endpoint, with NOEC values approximately 2 times or lower than the calculated LC10 values. The investigated effects on the enzymatic activities of E. fetida and the observed histopathological alterations (longitudinal and circular muscle lesions, edematous tissues, endothelial degeneration and necrosis) proved to be sensitive biomarkers to monitor pesticide contamination and are proposed as alternative measures to evaluate pesticide risks on agro-ecosystems.

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