Articles | Volume 18, issue 15
https://doi.org/10.5194/bg-18-4535-2021
https://doi.org/10.5194/bg-18-4535-2021
Research article
 | 
04 Aug 2021
Research article |  | 04 Aug 2021

How are oxygen budgets influenced by dissolved iron and growth of oxygenic phototrophs in an iron-rich spring system? Initial results from the Espan Spring in Fürth, Germany

Inga Köhler, Raul E. Martinez, David Piatka, Achim J. Herrmann, Arianna Gallo, Michelle M. Gehringer, and Johannes A. C. Barth

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Cited articles

Andrews, S. C., Robinson, A. K., and Rodríguez-Quiñones, F.: Bacterial iron homeostasis, FEMS Microbiol. Rev., 27, 215–237, https://doi.org/10.1016/S0168-6445(03)00055-X, 2003. 
Appelo, T., Van der Weiden, M. J., Tournassat, C., and Charlet, L.: Surface Complexation of Ferrous Iron and Carbonate on Ferrihydrite and the Mobilization of Arsenic, Environ. Sci. Technol., 36, 3096–3103, https://doi.org/10.1021/es010130n, 2002. 
Armstrong, W. and Armstrong, J.: Stem photosynthesis not pressurised ventilation is responsible for light-enhanced oxygen supply to submerged roots of alder (Alnus glutinosa), Ann. Bot., 96, 591–612, https://doi.org/10.1093/aob/mci213, 2005. 
Barkan, E. and Luz, B.: High precision measurements of 17O/16O and 18O/16O ratios in H2O, Rapid Commun. Mass Sp., 19, 3737–3742, https://doi.org/10.1002/rcm.2250, 2005. 
Barth, J. A. C., Tait, A., and Bolshaw, M.: Automated analyses of O-18 / O-16 ratios in dissolved oxygen from 12-mL water samples, Limnol. Oceanogr. Method., 2, 35–41, https://doi.org/10.4319/lom.2004.2.35, 2004. 
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We investigated how high Fe(II) levels influence the O2 budget of a circum-neutral Fe(II)-rich spring and if a combined study of dissolved O (DO) and its isotopic composition can help assess this effect. We showed that dissolved Fe(II) can exert strong effects on the δ18ODO even though a constant supply of atmospheric O2 occurs. In the presence of photosynthesis, direct effects of Fe oxidation become masked. Critical Fe(II) concentrations indirectly control the DO by enhancing photosynthesis.
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