Articles | Volume 20, issue 17
https://doi.org/10.5194/bg-20-3613-2023
https://doi.org/10.5194/bg-20-3613-2023
Research article
 | 
31 Aug 2023
Research article |  | 31 Aug 2023

Bacterioplankton dark CO2 fixation in oligotrophic waters

Afrah Alothman, Daffne López-Sandoval, Carlos M. Duarte, and Susana Agustí

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Cited articles

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Baltar, F. and Herndl, G. J.: Ideas and perspectives: Is dark carbon fixation relevant for oceanic primary production estimates?, Biogeosciences, 16, 3793–3799, https://doi.org/10.5194/bg-16-3793-2019, 2019. 
Baltar, F., Arístegui, J., Sintes, E., Gasol, J. M., Reinthaler, T., and Herndl, G. J.: Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic, Geophys. Res. Lett., 37, L09602, https://doi.org/10.1029/2010GL043105, 2010. 
Baltar, F., Lundin, D., Palovaara, J., Lekunberri, I., Reinthaler, T., Herndl, G. J., and Pinhassi, J.: Prokaryotic responses to ammonium and organic carbon reveal alternative CO2 fixation pathways and importance of alkaline phosphatase in the mesopelagic North Atlantic, Front. Microbiol., 7, 1670, https://doi.org/10.3389/fmicb.2016.01670, 2016. 
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Short summary
This study investigates bacterial dissolved inorganic carbon (DIC) fixation in the Red Sea, an oligotrophic ecosystem, using stable-isotope labeling and spectroscopy. The research reveals that bacterial DIC fixation significantly contributes to total DIC fixation, in the surface and deep water. The study demonstrates that as primary production decreases, the role of bacterial DIC fixation increases, emphasizing its importance with photosynthesis in estimating oceanic carbon dioxide production.
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