|
(70-30) Speciation and ecotoxicity assessment of copper in freshwater mesocosms. Bonzom, Jean-Marc*,1, Roussel, Hélène1, Pandard, Pascal1, Loreau, Michel2, Gauthier, Laury3, Vervier, Philippe4, Gérino, Magali4, Porcher, Jean-Marc1, Morin, Anne5, Lagadic, Laurent6, 1 INERIS, Unité d'évaluation des risques écotoxicologiques, Verneuil-en-Halatte, France2 Laboratoire Fonctionnement et évolution des systèmes écologiques; Ecole Normale Supérieure - UMR 7625; 46, rue d'Ulm, Paris, France3 Centre de biologie du développement, Lab. d'écotoxicologie, UMR 5547- Uni. Paul Sabatier, 118 route de Narbonne, Toulouse Cedex, France4 Centre d'écologie des systèmes aquatiques continentaux, UMR C5576 CNRS-Uni.Paul Sabatier, 29 rue Jeanne Marvig, Toulouse, France5 INERIS, Unité de chimie de l'environnement, Verneuil-en-Halatte, France6 Ecotoxicologie aquatique, INRA SCRIBE, Campus de Beaulieu, Rennes, France ABSTRACT- The presence of anthropogenic copper in the environment results mainly from agricultural, urban and industrial activities. Aquatic ecosystems are particularly exposed to copper pollution. Copper interacts with many dissolved, colloidal and particulate compounds, this affects its fate and bioavailability. The importance of considering metal bioavailability in assessing ecological impacts has been recognized by both regulatory authorities and the scientific community. The aim of this project is to evaluate the relationships between the concentrations of copper species (dissolved/particulate fraction, free ion species) in the different biotic and abiotic compartments, biomarkers, community structure and the functioning of the ecosystem. To achieve this goal, a freshwater mesocosm project, set up in collaboration with multidisciplinary teams, is under development. During 18 months, sulfate copper is applied to 9 mesocosms, in 3 duplicate doses, while 3 other systems served as controls. These mesocosms (20 meters long, 1 meter wide and 30 and 70 cm deep) contain sediments, rocks, aquatic plants, primary producers (phytoplankton, periphyton), primary consumers (freshwater and sediment invertebrates), secondary consumers (fish) and detritivores. This poster presents this project. Key words: Copper species, Aquatic mesocosm, Biomarkers, Ecosystem effects |
