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Science 22 March 1991:
Vol. 251. no. 5000, pp. 1471 - 1473
DOI: 10.1126/science.11538266
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Articles

Science, Vol 251, Issue 5000, 1471-1473
Copyright © 1991 by American Association for the Advancement of Science

articles

Aerobic sulfate reduction in microbial mats

DE Canfield and DJ Des Marais

National Aeronautics and Space Administration-Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA.

Measurements of bacterial sulfate reduction and dissolved oxygen (O2) in hypersaline bacterial mats from Baja California, Mexico, revealed that sulfate reduction occurred consistently within the well-oxygenated photosynthetic zone of the mats. This evidence that dissimilatory sulfate reduction can occur in the presence of O2 challenges the conventional view that sulfate reduction is a strictly anaerobic process. At constant temperature, the rates of sulfate reduction in oxygenated mats during daytime were similar to rates in anoxic mats at night: thus, during a 24-hour cycle, variations in light and O2 have little effect on rates of sulfate reduction in these mats.


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Microbialite Formation in Seawater of Increased Alkalinity, Satonda Crater Lake, Indonesia.
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Successional Development of Sulfate-Reducing Bacterial Populations and Their Activities in a Wastewater Biofilm Growing under Microaerophilic Conditions.
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Microscale observations of sulfate reduction: Correlation of microbial activity with lithified micritic laminae in modern marine stromatolites.
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