Articles | Volume 14, issue 2
https://doi.org/10.5194/bg-14-285-2017
https://doi.org/10.5194/bg-14-285-2017
Research article
 | 
19 Jan 2017
Research article |  | 19 Jan 2017

The fate of fixed nitrogen in marine sediments with low organic loading: an in situ study

Stefano Bonaglia, Astrid Hylén, Jayne E. Rattray, Mikhail Y. Kononets, Nils Ekeroth, Per Roos, Bo Thamdrup, Volker Brüchert, and Per O. J. Hall

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Cited articles

Algesten, G., Wikner, J., Sobek, S., Tranvik, L. J., and Jansson, M.: Seasonal variation of CO2 saturation in the Gulf of Bothnia: Indications of marine net heterotrophy, Global Biogeochem. Cy., 18, GB4021, https://doi.org/10.1029/2004GB002232, 2004.
An, S. and Gardner, W. S.: Dissimilatory nitrate reduction to ammonium (DNRA) as a nitrogen link, versus denitrification as a sink in a shallow estuary (Laguna Madre/Baffin Bay, Texas), Mar. Ecol. Prog. Ser., 237, 41–50, https://doi.org/10.3354/meps237041, 2002.
Bale, N. J., Villanueva, L., Fan, H., Stal, L. J., Hopmans, E. C., Schouten, S., and Sinninghe Damsté, J. S.: Occurrence and activity of anammox bacteria in surface sediments of the southern North Sea, FEMS Microbiol. Ecol., 89, 99–110, https://doi.org/10.1111/1574-6941.12338, 2014.
Billen, G.: A budget of nitrogen recycling in North Sea sediments off the Belgian coast, Estuar. Coast. Mar. Sci., 7, 127–146, https://doi.org/10.1016/0302-3524(78)90070-1, 1978.
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Short summary
Understanding nitrogen (N) cycling mechanisms in the ocean is crucial for improving ecosystem management. Here we study N processes by in situ lander and isotope tracer techniques in – so far overlooked – sediments with low organic loads. Denitrification and anammox are the main N transformation processes. However, we demonstrate high contribution of dissimilatory nitrate reduction to ammonium, which recycles a major portion of fixed N to the water column and sustains primary production.
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