Articles | Volume 18, issue 15
Biogeosciences, 18, 4535–4548, 2021
https://doi.org/10.5194/bg-18-4535-2021
Biogeosciences, 18, 4535–4548, 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 et al.

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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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