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Role of the hyporheic heterotrophic biofilm on transformation and toxicity of pesticides

Sanchez-Pérez, José-Miguel and Montuelle, Bernard and Mouchet, Florence and Gauthier, Laury and Julien, Frédéric and Sauvage, Sabine and Teissier, Samuel and Dedieu, Karine and Destrieux, Doriane and Vervier, Philippe and Gérino, Magali Role of the hyporheic heterotrophic biofilm on transformation and toxicity of pesticides. (2013) Annales de Limnologie - International Journal of Limnology, 49 (2). 87-95. ISSN 0003-4088

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Official URL: http://dx.doi.org/10.1051/limn/2013041

Abstract

The role of heterotrophic biofilm of water–sediment interface in detoxification processes was tested in abiotic and biotic conditions under laboratory conditions. Three toxicants, a herbicide (Diuron), a fungicide (Dimethomorph) and an insecticide (Chlorpyrifos-ethyl) have been tested in water percolating into columns reproducing hyporheic sediment. The detoxification processes were tested by comparing the water quality after 18 days of percolation with and without heterotrophic biofilm. Tested concentrations were 30 mg.Lx1 of Diuron diluted in 0.1% dimethyl sulfoxide (DMSO), 2 mg.Lx1 of Dimethomorph and 0.1 mg.Lx1 of Chlorpyrifos-ethyl. To characterise the detoxification efficiency of the system, we performed genotoxicity bioassays in amphibian larvae and rotifers and measured the respiration and denitrification of sediments. Although the presence of biofilm increased the production of N-(3,4 dichlorophenyl)-N-(methyl)-urea, a metabolite of diuron, the toxicity did not decrease irrespective of the bioassay. In the presence of biofilm, Dimethomorph concentrations decreased compared with abiotic conditions, from 2 mg.Lx1 to 0.4 mg.Lx1 after 18 days of percolation. For both Dimethomorph and Chlorpyrifos-ethyl additions, assessment of detoxification level by the biofilm depended on the test used: detoxification effect was found with amphibian larvae bioassay and no detoxification was observed with the rotifer test. Heterotrophic biofilm exerts a major influence in the biochemical transformation of contaminants such as pesticides, suggesting that the interface between running water and sediment plays a role in self-purification of stream reaches.

Item Type:Article
Additional Information:Thanks to EDP Sciences editor. The definitive version is available at http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8921230
Audience (journal):National peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Laury Gauthier
Deposited On:11 Apr 2014 06:58

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