title: The interplay of microbially mediated and abiotic reactions in the biogeochemical Fe cycle.
abstract: Many iron (Fe) redox processes that were previously assumed to be purely abiotic, such as photochemical Fe reactions, are now known to also be microbially mediated. Owing to this overlap, discerning whether biotic or abiotic processes control Fe redox chemistry is a major challenge for geomicrobiologists and biogeochemists alike. Therefore, to understand the network of reactions within the biogeochemical Fe cycle, it is necessary to determine which abiotic or microbially mediated reactions are dominant under various environmental conditions. In this Review, we discuss the major microbially mediated and abiotic reactions in the biogeochemical Fe cycle and provide an integrated overview of biotic and chemically mediated redox transformations.
authors.affiliation: Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany.
authors.forename: Emily D
authors.initials: ED
authors.lastname: Melton
authors.affiliation: Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany.
authors.forename: Elizabeth D
authors.initials: ED
authors.lastname: Swanner
authors.affiliation: Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Behrens
authors.affiliation: Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany.
authors.forename: Caroline
authors.initials: C
authors.lastname: Schmidt
authors.affiliation: Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kappler
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D004579:Electron Transport; D007501:Iron / Q000737:chemistry / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism; D014871:Water Microbiology
chemical_list: D007501:Iron; D010100:Oxygen