Objetivo The main objective of the project is to study the production of dissolved organic matter by the marine biota, the formation of mucilages from this DOM and the degradation steps it undergoes.The objectives will be accomplished through the following :1. Field work during which samples will be taken in the mouths of the rivers and in the gulf of Trieste, to monitor the nutrients inputs, and to follow the biological production and its consequences in term of particulate carbon fluxes and dissolved organic matter production. These cruises will be organised at three different periods of the year (May, end of June, September) to catch the periods of primary production, appearance of mucilages and degradation of aggregates. Nutrients and chlorophyll monitoring in the mouths of the river will be performed with a higher frequency (about each month) to get a representation of the yearly variability. During the main cruises, will be measured species determination, pigments, POC, DOC, nutrients, bacterial biomass and activity. On limited samples will be performed a molecular determination of biomarkers and a separation of the colloidal fraction (analysed the same way). Sediment traps will be deployed by sequences during the programme. Sediment cores will be taken to measure the accumulation of organic matter and study the degradation processes occurring after burial.2. Laboratory experiments : Besides the field work, laboratory experiments will be performed. Cultures of selected planktonic species, known to have a high yield in DOM excretion, will be done, the nutrients supply being controlled in order to simulate high sudden inputs and mis-equilibrated inputs (Variable N/P ratio). During the experiments, POC, DOC, TDN (DON), pigments, molecules identification and growing rate will be monitored. Another kind of experiments will be done. Dissolved organic matter from extracellular release and accumulated aggregates (mucilages) will be degraded by bacteria under controlled conditions. These experiments will be done together with identification and growing of natural populations. The purpose of these experiments is to check the ability of bacteria to adapt to this kind of material and perform its degradation. The enzymatic activity of bacteria and the possible transfer of plasmids will be measured. Ámbito científico natural sciencesbiological sciencesmicrobiologybacteriologyagricultural sciencesagricultural biotechnologybiomass Programa(s) FP3-ENV 1C - Specific research and technological development programme (EEC) in the field of the environment, 1990-1994 Tema(s) 040202 - Regional aspects of ecosystems protection Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador Centre National de la Recherche Scientifique (CNRS) Aportación de la UE Sin datos Dirección 52 avenue de Villeneuve 66860 Perpignan Francia Ver en el mapa Coste total Sin datos Participantes (5) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Francia Aportación de la UE Sin datos Dirección Quai de la Darse, Observatoire Océanologique 06238 VILLEFRANCHE SUR MER Ver en el mapa Coste total Sin datos Centre National de la Recherche Scientifique Francia Aportación de la UE Sin datos Dirección Avenue de Fontaulé 1 66651 BANYULS SUR MER Ver en el mapa Coste total Sin datos Consorzio per la Gestione del Laboratorio di Biologia Marina Italia Aportación de la UE Sin datos Dirección Strada Costiera 336 34010 Trieste Ver en el mapa Coste total Sin datos UNIVERSITY OF TROMSOE Noruega Aportación de la UE Sin datos Dirección 9037 TROMSOE Ver en el mapa Coste total Sin datos Università degli Studi di Siena Italia Aportación de la UE Sin datos Dirección Via P. A. Mattioli 4 53100 Siena Ver en el mapa Coste total Sin datos