Articles | Volume 13, issue 16
https://doi.org/10.5194/bg-13-4645-2016
https://doi.org/10.5194/bg-13-4645-2016
Research article
 | 
18 Aug 2016
Research article |  | 18 Aug 2016

Nitrogen isotopic evidence for a shift from nitrate- to diazotroph-fueled export production in the VAHINE mesocosm experiments

Angela N. Knapp, Sarah E. Fawcett, Alfredo Martínez-Garcia, Nathalie Leblond, Thierry Moutin, and Sophie Bonnet

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Cited articles

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Altabet, M. A.: Variations in Nitrogen Isotopic Composition between Sinking and Suspended Particles – Implications for Nitrogen Cycling and Particle Transformation in the Open Ocean, Deep-Sea Res. Pt. I, 35, 535–554, 1988.
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Benner, R.: Chemical Composition and Reactivity, in: Biogeochemistry of Marine Dissolved Organic Matter, edited by: Hansell, D. A. and Carlson, C. A., Academic Press, New York, 2002.
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The goal of this manuscript was to track the fate of newly fixed nitrogen (N) in large volume mesocosms in the coastal waters of New Caledonia. We used a N isotope ("δ15N") budget and found a shift in the δ15N of sinking particulate N over the 23-day experiment, indicating that nitrate supported export production at the beginning of the experiment, but that nitrogen fixation supported export at the end. We infer that nitrogen fixation supported export production by a release of dissolved N.
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