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FEMS Microbiol Ecol

Title:		"Acetate, lactate, propionate, and isobutyrate as electron donors for iron and sulfate reduction in Arctic marine sediments, Svalbard"
Author(s):		Finke N; Vandieken V; Jorgensen BB;
Address:		"Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany. nfinke@web.de"
Journal Title:		FEMS Microbiol Ecol
Year:		2007
Volume:		20061027
Issue:		1
Page Number:		10 - 22
DOI:		10.1111/j.1574-6941.2006.00214.x
ISSN/ISBN:		0168-6496 (Print) 0168-6496 (Linking)
Abstract:		"The contribution of volatile fatty acids (VFA) as e(-)-donors for anaerobic terminal oxidation of organic carbon through iron and sulfate reduction was studied in Arctic fjord sediment. Dissolved inorganic carbon, Fe(2+), VFA concentrations, and sulfate reduction were monitored in slurries from the oxidized (0-2 cm) and the reduced (5-9 cm) zone. In the 0-2 cm layer, 2/3 of the mineralization could be attributed to sulfate reduction and 1/3 to iron reduction. In the 5-9 cm layer, sulfate reduction was the sole mineralization process. Acetate and lactate turnover rates were measured by radiotracer. Inhibition of sulfate reduction with selenate resulted in the accumulation of acetate, propionate, and isobutyrate. The acetate turnover rates determined by radiotracer and accumulation after inhibition were similar. VFA turnover accounted for 21% and 52% of the mineralization through sulfate reduction in the 0-2 and 5-9 cm layer, respectively. Acetate and lactate turnover in the inhibited 0-2 cm slurry was attributed to iron reduction and accounted for 10% and 2% of the iron reduction. Therefore, 88% and 79% of the iron and sulfate reduction in the 0-2 cm layer, respectively, must be fueled by alternative e(-)-donors. The accumulation of VFA in the selenate-inhibited 0-2 cm slurry did not enhance iron reduction, indicating that iron reducers were not limited by VFA availability"
Keywords:		"Acetates/metabolism Butyrates/metabolism Fatty Acids, Volatile/*metabolism Geologic Sediments/chemistry/*microbiology Iron/*metabolism Lactic Acid/metabolism Oxidation-Reduction Propionates/metabolism Selenic Acid Selenium Compounds/chemistry Soil Microbi;"
Notes:		"MedlineFinke, Niko Vandieken, Verona Jorgensen, Bo Barker eng Research Support, Non-U.S. Gov't England 2006/10/31 FEMS Microbiol Ecol. 2007 Jan; 59(1):10-22. doi: 10.1111/j.1574-6941.2006.00214.x. Epub 2006 Oct 27"