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(W/MF148) Presentation and validation of a new fresh water mesoscosm, with sixteen open streams. Basseres, Anne1, Simonet, François2, Lafont, Michel3, Coste, Michel4, Narbonne, Jean-François5, 1 2 3 4 5 ABSTRACT- The use of exposure biomarkers in measuring the impact of aqueous waste on aquatic ecosystems is promising because such tools have short response times, are flexible to use and give an indication of the type of pollution. However, their ecological significance has not yet been demonstrated. Such a demonstration needs to be carried out under controlled conditions, with reference with bioceonotic responses. Working in partnership with the Adour Garonne Water Board, and under the scientific control of an expert committee, the TotalFinaElf company has developed a pilot scheme incorporating such controlled conditions. This pilot scheme is made up of 16 open streams, 40 m in length supplied by river water. The pilot scheme makes it possible to recreate an aquatic ecosystem which, once established, can be exposed to perfectly controlled pollution conditions. Results concerning the first step of the study are given. An installation of a natural community of diatoms, oligochaetes and benthic invertebrates was measured over an eight month period. A number of bacteria and microtox as well as biomarkers and physico-chemical responses were analysed. Biomarkers responses were measured in the fresh water-bivalve (Corbicula fluminea). Based on a statistical analysis of the responses, the studied conditions provided a reproducible pilot scheme. Key words: fresh water, artificial stream, mesocosm, bioindicator |
