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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Lower Seine river and estuary (France) carbon and oxygen budgets during low flow
Auteurs :	J. Garnier, Auteur ; P. Servais, Auteur ; G. Billen, Auteur ; M. Akopian, Auteur ; N. Brion, Auteur
Type de document :	Article
Dans :	Estuaries (24(6B) DEC 2001)
Article en page(s) :	964-976
Résumé :	Ecological processes driving the oxygen budget were investigated in the downstream part of the Seine River and its estuary. Phytoplankton and bacterio plankton production were measured along longitudinal profiles (11 to 17 stations) in a range of low discharges from 300 m(3) s(-1) in 1993 and 1995 to 140 m(s) s(-1) in 1996. Values representative of the water column were based on investigations carried out during two tidal cycles. Net primary production was invariably greatest in the freshwater estuary, from Poses to Rouen (from 500 to 1,000 mug C 1(-1) d(-1) between PK 202 and 240) and decreased sharply downstream (from 10 to 25 mug C 1(-1) d(1) between PK 250 and 3 10). This decrease was mainly due to the deterioration of the light conditions with the increase in depth and suspended matter concentrations. Heterotrophic activity was maximum in the reach where primary production declined. judging by the production:respiration ratio (P:R), the system appeared clearly heterotrophic in the Seine River immediately downstream of the Paris region due to high allochthonous organic pollution by the incompletely treated Patisian effluents and in the part of the estuary characterized by intense degradation of autochthonous material. Because the effluents are not treated by a nitrification step, the oxygen consumption due to nitrification was much higher than expected from the P:R ratio. Oxidation of ammonium represented an oxygen consumption of between I and

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