Hydrogen, acetate, and lactate as electron donors for microbial manganese reduction in a manganese-rich coastal marine sediment
Copyright policy )Hydrogen, acetate, and lactate as electron donors for microbial manganese reduction in a manganese-rich coastal marine sediment
The role of hydrogen, acetate, and lactate as electron donors for microbial manganese reduction was investigated in manganese-rich marine sediment from Gullmar Fjord (Sweden). Here, manganese reduction accounted for 50% of the anaerobic carbon oxidation at 0-15 cm sediment depth. In anoxic incubations from 0 to 5 cm depth, where manganese reduction dominated completely as terminal electron-accepting process, the combined contribution of acetate and lactate as electron donors for manganese reducers corresponded to 75% of the electron flow that did not involve acetate and lactate. Alternatively, the oxidation of more complex organic substrates could be involved. Our study provides the first direct evidence of substrate utilization by a natural manganese-reducing community and indicates similar mechanisms of thermodynamic control and competition for electron donors as known from sediments dominated by iron reduction, sulfate reduction, or methanogenesis.
Fatty Acids, Volatile/chemistry, Geologic Sediments, Geologic Sediments/chemistry, Iron, Lactic Acid/chemistry, Electrons, Acetates, Environmental, Energy yield, Acetates/chemistry, Anaerobic carbon degradation, Lactic Acid, Volatile/chemistry, Sweden, Sulfates/chemistry, Manganese, Competition, Bacteria, Sulfates, Fatty Acids, Hydrogen/chemistry, Fatty Acids, Volatile, Carbon, Biodegradation, Environmental, Fermentation products, Iron/chemistry, Manganese/chemistry, Carbon/chemistry, Bacteria/metabolism, Biodegradation, Volatile fatty acids, Oxidation-Reduction, Hydrogen
Fatty Acids, Volatile/chemistry, Geologic Sediments, Geologic Sediments/chemistry, Iron, Lactic Acid/chemistry, Electrons, Acetates, Environmental, Energy yield, Acetates/chemistry, Anaerobic carbon degradation, Lactic Acid, Volatile/chemistry, Sweden, Sulfates/chemistry, Manganese, Competition, Bacteria, Sulfates, Fatty Acids, Hydrogen/chemistry, Fatty Acids, Volatile, Carbon, Biodegradation, Environmental, Fermentation products, Iron/chemistry, Manganese/chemistry, Carbon/chemistry, Bacteria/metabolism, Biodegradation, Volatile fatty acids, Oxidation-Reduction, Hydrogen
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