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Pelagic metabolism of the Scheldt estuary measured by the oxygen method on an annual scale
Gazeau, F.; Borges, A.V.; Schiettecatte, L.-S.; Middelburg, J.; Frankignoulle, M.; Gattuso, J.P. (2004). Pelagic metabolism of the Scheldt estuary measured by the oxygen method on an annual scale, in: Mees, J. et al. (Ed.) VLIZ Young Scientists' Day, Brugge, Belgium 5 March 2004: book of abstracts. VLIZ Special Publication, 17: pp. 49
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, meer

Beschikbaar in  Auteurs 
Documenttype: Samenvatting

Trefwoorden
    Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide
    Chemical reactions > Nitrification
    Environments > Aquatic environment > Pelagic environment
    Metabolism
    Nutritional types > Heterotrophy
    Oxygen consumption
    Particulates > Suspended particulate matter
    Properties > Chemical properties > Salinity
    Properties > Physical properties > Turbidity
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    België, Schelde R. [Marine Regions]
    Marien

Auteurs  Top 
  • Gazeau, F., meer
  • Borges, A.V., meer
  • Schiettecatte, L.-S., meer
  • Middelburg, J., meer
  • Frankignoulle, M., meer
  • Gattuso, J.P., meer

Abstract
    Pelagic gross primary production (GPP), community respiration (CR) and nitrification were measured in the turbid Scheldt Estuary by the oxygen Winkler method from January to December 2003 at monthly intervals (EUROTROPH EU project). Five stations along the estuary were investigated, corresponding to a salinity (S) range of 0-25. Water was sampled and incubated until sunset in 60 ml glass bottles stored in a 5 compartment incubator kept at in situ temperature by flowing water. Irradiance was controlled in each compartment by filters having a shading capacity ranging from 0 to 100%. In order to estimate the oxygen consumption due to the respiration and nitrification processes, samples were incubated, in the dark compartment, with and without addition of nitrification inhibitors. Net community production (NCP) was most of the time negative in the estuary with values ranging from -275 to +31mmol O2.m-2.d-1 and the lowest values were found near Antwerp (S = 2). Strong pelagic GPP and positive NCP rates were observed in the freshwater part during summer with a maximal value in June (+373mmol O2.m-2.d-1), corresponding to an increase of the O2 concentration and a decrease of the partial pressure of CO2 (pCO2) in the water column during this period. Nitrification contributes 5 to 60% of the oxygen consumption in the water column with highest values measured in the inner part of the estuary due to high ammonium and suspended matter concentrations. Assuming a C/O2 molar ratio of 0.07, we estimated that nitrification represents on an annual scale 35% of organic matter production at salinity 2 which is consistent with previous estimates. NCP rates measured in 2003 are among the lowest reported in the literature and confirm the strong heterotrophic status of the Scheldt Estuary.

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