STARDUST II - Spatial and Temporal Assessment of high Resolution Depth profiles Using novel Sampling Technologies
The fate of pollutants in fluvial and marine sediments in cross-border zones
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Comparison of nitrifier activity versus growth in the Scheldt estuary - a turbid, tidal estuary in northern Europe
Andersson, M.G.I.; Brion, N.; Middelburg, J.J. (2006). Comparison of nitrifier activity versus growth in the Scheldt estuary - a turbid, tidal estuary in northern Europe. Aquat. Microb. Ecol. 42(2): 149-158. dx.doi.org/10.3354/ame042149
In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055; e-ISSN 1616-1564
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Population functions > Growth
    Brak water; Zoet water
Author keywords
    nitrification; nitrifier activity; nitrifier growth; 15<; sup>N stable isotopes; 14<; sup>C bicarbonate
Auteurs  Top 
  • Andersson, M.G.I.
  • Brion, N.
  • Middelburg, J.J.
Abstract
    Nitrifier activity and growth were measured in the Scheldt estuary over a salinity gradient. Measurements were made during all 4 seasons using 15N enriched ammonium and 14C labeled carbon incorporation. Established conversion ratios are often used to convert the growth of nitrifiers (measured as the incorporation of carbon) to nitrifying activity (i.e. oxidation of ammonium to nitrate). Our study demonstrated that the conversion of growth rates to nitrifying activity induces uncertainty because activity and growth of nitrifiers may be uncoupled. The C:N conversion ratio appears to be oxygen and temperature dependent. We advocate the use of 15N stable isotope techniques to study nitrification: this technique measures the actual activity of nitrifiers without the disadvantages involved in using inhibitors, and thus allows light inhibition to be measured.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)