Articles | Volume 19, issue 2
Biogeosciences, 19, 415–435, 2022
https://doi.org/10.5194/bg-19-415-2022

Special issue: Atmospheric deposition in the low-nutrient-low-chlorophyll...

Biogeosciences, 19, 415–435, 2022
https://doi.org/10.5194/bg-19-415-2022
Research article
25 Jan 2022
Research article | 25 Jan 2022

N2 fixation in the Mediterranean Sea related to the composition of the diazotrophic community and impact of dust under present and future environmental conditions

Céline Ridame et al.

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Cited articles

Aminot, A. and Kérouel, R.: Dosage automatique des nutriments dans les eaux marines, in: Méthodes d'analyses en milieu marin, edited by: edited by: IFREMER, Editions Quae, Versailles, 188 pp., 2007. 
Angel, R., Nepel, M., Panhölzl, C., Schmidt, H., Herbold, C. W., Eichorst, S. A., and Woebken, D.: Evaluation of primers targeting the diazotroph functional gene and development of NifMAP–A bioinformatics pipeline for analyzing nifH amplicon data, Front. Microbiol., 9, 703, https://doi.org/10.3389/fmicb.2018.00703, 2018. 
Bar Zeev, E., Yogev, T., Man-Aharonovich, D., Kress, N., Herut, B., Beja, O., and Berman-Frank, I.: Seasonal dynamics of the endosymbiotic, nitrogen-fixing cyanobacterium Richelia intracellularis in the Eastern Mediterranean Sea, ISME J., 2, 911–923, https://doi.org/10.1038/ismej.2008.56, 2008. 
Benavides, M., Bonnet, S., Hernández, N., Martínez-Pérez, A. M., Nieto-Cid, M., and Álvarez-Salgado, X. A.: Basin-wide N2 fixation in the deep waters of the Mediterranean Sea, Global Biogeochem. Cy., 30, 952–961, https://doi.org/10.1002/2015GB005326, 2016. 
Bentzon-Tilia, M., Traving, S. J., Mantikci, M., Knudsen-Leerbeck, H., Hansen, J. L. S., Markager, S., and Riemann, L.: Significant N2 fixation by heterotrophs, photoheterotrophs and heterocystous cyanobacteria in two temperate estuaries, ISME J., 9, 273–285, https://doi.org/10.1038/ismej.2014.119, 2015. 
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Short summary
We show that in the Mediterranean Sea spatial variability in N2 fixation is related to the diazotrophic community composition reflecting different nutrient requirements among species. Nutrient supply by Saharan dust is of great importance to diazotrophs, as shown by the strong stimulation of N2 fixation after a simulated dust event under present and future climate conditions; the magnitude of stimulation depends on the degree of limitation related to the diazotrophic community composition.
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