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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 6755

Klara Kobeticova, Jakub Hofman, and Ivan Holoubek; Avoidance response of Enchytraeus albidus in relation to carbendazim ageing. Environmental Pollution 157:704-706, 2009

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In this study, avoidance response of Enchytraeus albidus to LUFA 2.2 soil contaminated with pesticide carbendazim was investigated. To aim was to clarify minimal test duration and temporal changes in avoidance response due to contamination ageing. Firstly, the concentration causing 50% avoidance (EC50) was determined as 7.6 mg/kg. Then, test duration needed to reach this value (ET50=approximately 18 hr) was identified. Finally, the capability of E. albidus avoidance test to reflect the changes of pollutant bioavailability was tested. The soil was spiked with carbendazim at the EC50 concentration 1, 14, or 28 days before the test started and avoidance effects of fresh versus aged contamination were compared. The results indicated that encytraeids preferred soil contaminated for 28 days prior to assay where carbendazim was probably less bioavailability than in freshly spiked soil. Our results open an interesting research area of potential use of avoidance tests for contaminant bioavailability assessment.