Articles | Volume 15, issue 1
Biogeosciences, 15, 1–12, 2018
https://doi.org/10.5194/bg-15-1-2018
Biogeosciences, 15, 1–12, 2018
https://doi.org/10.5194/bg-15-1-2018

Research article 02 Jan 2018

Research article | 02 Jan 2018

Effect of light on N2 fixation and net nitrogen release of Trichodesmium in a field study

Yangyang Lu et al.

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Cited articles

Adam, B., Klawonn, I., Svedén, J. B., Bergkvist, J., Nahar, N., Walve, J., Littmann, S., Whitehouse, M. J., Lavik, G., and Kuypers, M. M.: N2-fixation, ammonium release and N-transfer to the microbial and classical food web within a plankton community, ISME J., 10, 450–459, https://doi.org/10.1038/ismej.2015.126, 2015. 
Bell, P. R. and Fu, F.-X.: Effect of light on growth, pigmentation and N2 fixation of cultured Trichodesmium sp. from the Great Barrier Reef lagoon, Hydrobiologia, 543, 25–35, https://doi.org/10.1007/s10750-004-5713-2, 2005. 
Benavides, M., Bronk, D. A., Agawin, N. S., Pérez-Hernández, M. D., Hernández-Guerra, A., and Arístegui, J.: Longitudinal variability of size-fractionated N2 fixation and DON release rates along 24.5 N in the subtropical North Atlantic, J. Geophys. Res., 118, 3406–3415, https://doi.org/10.1002/jgrc.20253, 2013. 
Bergman, B., Sandh, G., Lin, S., Larsson, J., and Carpenter, E. J.: Trichodesmium – a widespread marine cyanobacterium with unusual nitrogen fixation properties, FEMS Microbiol. Rev., 37, 286–302, https://doi.org/10.1111/j.1574-6976.2012.00352.x, 2013. 
Berthelot, H., Bonnet, S., Camps, M., Grosso, O., and Moutin, T.: Assessment of the dinitrogen released as ammonium and dissolved organic nitrogen by unicellular and filamentous marine diazotrophic cyanobacteria grown in culture, Front. Mar. Sci., 2, 80, https://doi.org/10.3389/fmars.2015.00080, 2015. 
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Short summary
We investigated the light response of field Trichodesmium N2 fixation and net dissolved nitrogen release behavior. Our results suggest that N2 fixation was a function of light intensity, and the light requirement of Trichodesmium nitrogen fixation was high relative to its photosynthetic light demand. Meanwhile, light is a crucial parameter driving the physiological state of Trichodesmium, which subsequently determined the C / N metabolism and net dissolved nitrogen release.
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