Distribution of nitrifying activity in the Seine River (France) from Paris to the estuary
Brion, N.; Billen, G.; Guézennec, J.; Ficht, A. (2000). Distribution of nitrifying activity in the Seine River (France) from Paris to the estuary. Estuaries 23(5): 669-682 In: Estuaries. The Estuarine Research Federation, Chesapeake Biological Laboratory: Columbia, S.C., etc.,. ISSN 0160-8347; e-ISSN 1559-2758, more |   |
| Keywords | Ammonium compounds
Chemical reactions > Nitrification
Energy flow
Motion > Tidal motion > Tides
Particulates > Suspended particulate matter
Wastewater
Wastewater disposal
Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
Water bodies > Inland waters > Rivers
Bacteria [WoRMS]
ANE, France, Haute-Normandie [Marine Regions]; ANE, France, Seine Estuary [Marine Regions]; France [Marine Regions]; France, Haute-Normandie [Marine Regions]; France, Seine R. [Marine Regions]
Brackish water; Fresh water |
| Authors | | Top | - Brion, N., more
- Billen, G., more
- Guézennec, J.
- Ficht, A.
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| Abstract | The distribution of nitrification has been measured with the H14CO3- incorporation method in the Seine River and its estuary during summer conditions. The Seine River below Paris receives large amounts of ammonium through wastewater discharge. In the river itself, this ammonium is only slowly nitrified, while in the estuary nitrification is rapid and complete. We show that this contrasting behavior is related to the different hydrosedimentary conditions of the two systems, as nitrifying bacteria are associated with suspended particles. In the river, particles and their attached bacteria either rapidly settle or have a sestonic behavior. Because of the short residence times of the water masses, the dow growing nitrifying population has no time to develop sufficiently to nitrify the available ammonium. The estuary is characterized by strong tidal dynamics. Particles settle and are resuspended continuously with the strong current inversions of ebb and hood. As a result of these dynamics, particles and their attached nitrifying bacteria experience longer residence times in a temporary suspended state than the water masses themselves, providing to slow growing nitrifying bacteria the opportunity to develop a large population capable of nitrifying all the available ammonium. |
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