Ecotoxicological effects of diuron and chlorotoluron nitrate-induced photodegradation products : monospecific and aquatic mesocosm-integrated studies

Autor: Frédérique Bonnemoy, Didier Azam, Sylvie Nélieu, Micheline Heydorff, Laurent Lagadic, Jacques Einhorn, Jean-Louis Bonnet, Alphonse Quémeneur, Luz Lefeuvre, Jacques Bohatier, Damien Baudiffier, Paul-Henri Ducrot
Přispěvatelé: Unité de phytopharmacie et médiateurs chimiques, Institut National de la Recherche Agronomique (INRA), Physicochimie et Ecotoxicologie des SolS d'Agrosystèmes Contaminés (PESSAC), Laboratoire Microorganismes : Génome et Environnement (LMGE), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université d'Auvergne - Clermont-Ferrand I (UdA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Biologie Cellulaire (LBC), Université d'Auvergne - Clermont-Ferrand I (UdA), Écologie et santé des écosystèmes (ESE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Unité Experimentale d'Ecologie et d'Ecotoxicologie Aquatique - U3E (Rennes, France) (U3E), Institut Jean-Pierre Bourgin (IJPB), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, INRA, Institut National des Sciences de l Univers [04CV079], Physico-chimie et Ecotoxicologie des Sols d'Agrosystèmes Contaminés, Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS)-Université d'Auvergne - Clermont-Ferrand I (UdA), Unité Expérimentale d'Ecologie et d'Ecotoxicologie (U3E), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Environmental Toxicology and Chemistry
Environmental Toxicology and Chemistry, 2010, 29 (xx), pp.xxx-xxx. ⟨10.1002/etc.341⟩
Environmental Toxicology and Chemistry, Wiley, 2010, 29 (xx), pp.xxx-xxx. ⟨10.1002/etc.341⟩
ISSN: 0730-7268
1552-8618
DOI: 10.1002/etc.341⟩
Popis: International audience; The ecotoxicological impact of nitrate-induced photodegradation products of diuron and chlorotoluron was studied through monospecific biotests conducted in conjunction with experiments in outdoor aquatic mesocosms. Organisms representing three trophic levels were used: two heterotrophic microorganisms, the luminescent bacterium Vibrio fischeri and the ciliated protozoa Tetrahymena pyriformis, and one metazoa, the gastropod Lymnaea stagnalis. Among the variety of the phenylurea photoproducts, the N-formylated ones appeared clearly more toxic than the parent compounds towards the microorganisms, whereas the nitroderivatives showed a similar toxicity. Using photodegraded solutions of diuron, toxicity was maintained or even increased during disappearance of the initial herbicide, demonstrating that some of the photoproducts may have an impact additively or in synergy. Enzymatic biomarker assays performed on Lymnaea stagnalis exposed under monospecific conditions showed significant effects, due to the combination of nitrate with the pesticide and its photoproducts. A positive impact on snail fecundity was observed with chlorotoluron both under monospecific laboratory and integrated mesocosm conditions. Oviposition stimulation took place when first- and second-generation photoproducts were predominant.
Databáze: OpenAIRE
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