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Uptake of dissolved inorganic nitrogen in turbid, tidal estuaries

Middelburg, J.J. and Nieuwenhuize, J. (2000) Uptake of dissolved inorganic nitrogen in turbid, tidal estuaries. Marine Ecology Progress Series, 192, 79-88. ISSN 0171-8630.

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Ammonium and nitrate uptake was measured in 6 European tidal estuaries (Ems, Rhine, Scheldt, Loire, Gironde and Douro) using N-15-tracer techniques. Uptake rates of ammonium and nitrate ranged from 0.005 to 1.56 mu mol N l(-1) h(-1) and 0.00025 to 0.25 mu mol N l(-1) h(-1), respectively, and differed significantly between and within estuaries. Analysis of nitrogen uptake using the relative preferential index (RPI) indicated ammonium to be the preferred substrate. The turnover times of particulate nitrogen (0.7 to 31 d) and dissolved ammonium (0.1 to 27 d) were similar to or shorter than estuarine-water residence times, whereas turnover times of dissolved nitrate (19 to 2160 d) were longer than residence times. Assimilation of nitrate in the water column of estuaries consequently does not influence its distribution, and most nitrate entering or produced in estuaries flushes through unless significant denitrification and/or burial in the sediment occur. As ammonium and particulate nitrogen are efficiently recycled, most allochthonous organic matter is extensively microbially modified before export, burial, or consumption by higher trophic levels. [KEYWORDS: nitrogen uptake; nitrogen turnover; ammonium; nitrate; estuary; heterotrophy Ecosystem model moses; north-atlantic ocean; schelde estuary; sw netherlands; river estuary; heterotrophic bacteria; westerschelde estuary; organic nitrogen; delaware estuary; nitrate uptake]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10898
Deposited On:24 Nov 2011 01:00
Last Modified:14 Oct 2013 11:22

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