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
Department of Geography and Geosciences, GeoZentrum Nordbayern,
Schlossgarten 5, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen,
Germany
Raul E. Martinez
Organic Paleobiogeochemistry, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany
Department of Geography and Geosciences, GeoZentrum Nordbayern,
Schlossgarten 5, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen,
Germany
Achim J. Herrmann
Division of Microbiology, Technische Universität Kaiserslautern, 67663 Kaiserslautern,
Germany
Arianna Gallo
Division of Microbiology, Technische Universität Kaiserslautern, 67663 Kaiserslautern,
Germany
Department of Geography and Geosciences, GeoZentrum Nordbayern,
Schlossgarten 5, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen,
Germany
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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.
We investigated how high Fe(II) levels influence the O2 budget of a circum-neutral Fe(II)-rich...
