Articles | Volume 20, issue 19
Research article
 | Highlight paper
12 Oct 2023
Research article | Highlight paper |  | 12 Oct 2023

Biomineralization of amorphous Fe-, Mn- and Si-rich mineral phases by cyanobacteria under oxic and alkaline conditions

Karim Benzerara, Agnès Elmaleh, Maria Ciobanu, Alexis De Wever, Paola Bertolino, Miguel Iniesto, Didier Jézéquel, Purificación López-García, Nicolas Menguy, Elodie Muller, Fériel Skouri-Panet, Sufal Swaraj, Rosaluz Tavera, Christophe Thomazo, and David Moreira

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Cited articles

Altschul, S. F., Madden, T. L., Schäffer, A. A., Zhang, J., Zhang, Z., Miller, W., and Lipman, D. J.: Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res., 25, 3389–3402,, 1997. 
Aumont, O. and Bopp, L.: Globalizing results from ocean in situ iron fertilization studies, Global Biogeochem. Cy., 20, GB2017,, 2006. 
Baker, A. R. and Croot, P. L.: Atmospheric and marine controls on aerosol iron solubility in seawater, Mar. Chem., 120, 4–13,, 2010.  
Baron, F., Petit, S., Tertre, E., and Decarreau, A.: Influence of aqueous Si and Fe speciation on tetrahedral Fe(III) substitutions in nontronites: A clay synthesis approach, Clay. Clay Miner., 64, 230–244,, 2016. 
Beghoura, H., Gorgues, T., Aumont, O., Planquette, H. f., Tagliabue, A., and Auger, P.-A.: Impact of inorganic particles of sedimentary origin on global dissolved iron and phytoplankton distribution, J. Geophys. Res.-Oceans, 124, 8626–8646,, 2019. 
This study documents the formation of Fe, Mn and Si amorphous mineral phases by very small cyanobacteria living in oxic, alkaline lakes. This finding has implications for using sedimentary Fe/Mn enrichments as a proxy for redox cycling in the past and extends the documented evidence for biomineralization of Si-rich phases.
Short summary
Iron and manganese are poorly soluble in oxic and alkaline solutions but much more soluble under anoxic conditions. As a result, authigenic minerals rich in Fe and/or Mn have been viewed as diagnostic of anoxic conditions. However, here we reveal a new case of biomineralization by specific cyanobacteria, forming abundant Fe(III)- and Mn(IV)-rich amorphous phases under oxic conditions in an alkaline lake. This might be an overlooked biotic contribution to the scavenging of Fe from water columns.
Final-revised paper