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Microbial uptake of dissolved organic and inorganic nitrogen in Randers Fjord Veuger, B.; Middelburg, J.J.; Boschker, H.T.S.; Nieuwenhuize, J.; Van Rijswijk, P.; Rochelle-Newall, E.J.; Navarro, N. (2004). Microbial uptake of dissolved organic and inorganic nitrogen in Randers Fjord. Est., Coast. and Shelf Sci. 61(3): 507-515. https://dx.doi.org/10.1016/j.ecss.2004.06.014 In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 352500 [ aanvragen ]

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Trefwoorden

Acids > Organic compounds > Organic acids > Amino acids Aquatic communities > Plankton > Phytoplankton Aquatic organisms > Heterotrophic organisms Chemical compounds > Organic compounds > Urea Marien/Kust

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Auteurs		Top
Veuger, B. Middelburg, J.J. Boschker, H.T.S. Nieuwenhuize, J.	Van Rijswijk, P. Rochelle-Newall, E.J. Navarro, N.

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Abstract

Uptake of 15N labeled NH4+, NO3−, urea and dissolved free amino acids (DFAA) was measured in April and August 2001 at 6 stations along the salinity gradient of Randers Fjord (Denmark) in order to clarify the relative importance of dissolved organic and inorganic nitrogen (DON and DIN) as N sources for the estuarine planktonic microbial community. Although microbial N uptake was generally dominated by DIN (especially NH4+), DON (both urea and DFAA) also served as an important N source and occasionally dominated uptake. Uptake of 15N labeled algal derived DON was measured in an attempt to mimic uptake of the complex ambient DON pool. Uptake rates for the algal derived DON in April were similar to those for NH4+ and even higher than the summed uptake of NH4+, NO3−, urea and DFAA in August, suggesting that DON other than urea and DFAA, likely dissolved combined amino acids (DCAA), also served as an important N source. In addition, the relative contributions of heterotrophic bacteria and phytoplankton to total microbial N uptake was estimated from bacterial productivity and measured by inhibiting bacterial N uptake with antibiotics.

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