CARACTERISTIQUES SAISONNIERES DE L'HYDROBIOLOG IE DU COMPLEXE ESTUARIEN DE MARENNES-OLERON (FRANCE)

摘要: SEASONAL FEATURES OF THE HYDROBIOLOGY ESTUARINE MARENNES-OLERON BAY (FRANCE), Four seasonal campaigns providing a sampling of 15 stations each followed during half tide cycle, i.e. 120 water samples allow to define the main hydrobiological features Marennes-Oler on Bay. The salinities vary 10 %c and this region can be consideded as vast estuary controlled mainly by input river Charente. turbidity remains high, often more than 100 mgl - ', dissolved oxygen values decrease 4 mgl-1 above Charente Seudre rivers, where at nutritive salts are carried in for nitrates phosphates silicates concer­ ned. They follow theoretical dilution curves except phytoplanctonic blooms winter swellings when, concerned, there might either inputs from Gironde or an organic mineralization ; concerned they appear absorbed particulars trapped sediments. biomasses chlorophyll p-gl"' estuaries, spring pheopigments over 200 M-gT', contrary hardly Hgl~' ATP concentrations show that little phytoplancton is physiologically active particularly protein results state precisely proportion allochthonous comparison with autochthonous production estuaries. A correspondance factorial analysis defines general schema estuarine bay shows does not only play part azotic phosphatic mineral input, but also brings phytoplanctoni c biomass fresh waters process degeneration. authors suggest new way adapted their objectives, will worked out future tidal cycles frequently possible.