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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [10188]

The leading role of ammonium in the nitrogen uptake regime of Southern Ocean marginal ice zones Goeyens, L.; Dehairs, F.A.; Tréguer, P.; Bauman, E.M.; Baeyens, W.F.J. (1995). The leading role of ammonium in the nitrogen uptake regime of Southern Ocean marginal ice zones. J. Mar. Syst. 6: 345-361 In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 103858 [ download pdf ]

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Trefwoorden

Algal blooms Ammonium compounds Aquatic communities > Plankton > Phytoplankton Biological production > Primary production Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Nitrogen cycle Ice cover Water bodies > Oceans > Marginal seas PS, Antarctische Oceaan [Marine Regions] Marien/Kust

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Auteurs		Top
Goeyens, L., meer Dehairs, F.A., meer Tréguer, P., meer	Bauman, E.M. Baeyens, W.F.J., meer

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Abstract

The nitrogen signature of marginal ice zones in the Southern Ocean often departs from the "classical" Antarctic nutrient profiles with high nitrate and low ammonium values in the surface layer. Weddell Sea marginal ice zones e.g. show enhanced nitrate depletions, amounting to similar to 500 mmol N m super(-2). Additionally, ammonium stocks in the upper layer can be up to 7% of the inorganic nitrogen pool. The corresponding nitrogen uptake regime suggests elevated nitrate assimilation during the early phase of the productive season and significantly reduced nitrate assimilation at a later stage. Absolute as well as specific nitrate uptake rates decrease by an order of magnitude when ammonium stocks exceed 1.7% of the total inorganic nitrogen. The variability in nitrogen utilisation reflects physiological changes in the phytoplankton assemblage. In response to increased ammonium stocks phytoplankton show a reduction in their capacity to take up nitrate and following an initial diatom bloom non-siliceous phytoplankton become predominant in a regenerated production regime.

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