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Applied and Environmental Microbiology, August 2007, p. 5218-5226, Vol. 73, No. 16
0099-2240/07/$08.00+0     doi:10.1128/AEM.00357-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

High Rates of Sulfate Reduction in a Low-Sulfate Hot Spring Microbial Mat Are Driven by a Low Level of Diversity of Sulfate-Respiring Microorganisms{triangledown}

Jesse G. Dillon,1* Susan Fishbain,2 Scott R. Miller,3 Brad M. Bebout,4 Kirsten S. Habicht,5 Samuel M. Webb,2 and David A. Stahl6

Department of Microbiology and NASA Astrobiology Institute, University of Washington, Seattle, Washington 98195,1 Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208,2 Division of Biological Sciences, University of Montana, Missoula, Montana 59812,3 Exobiology Branch, NASA Ames Research Center, Moffett Field, California 95035,4 Nordic Center for Earth Evolution and Institute of Biology, University of Southern Denmark, Odense, Denmark,5 Department of Civil and Environmental Engineering and NASA Astrobiology Institute, University of Washington, Seattle, Washington 981956

Received 13 February 2007/ Accepted 8 June 2007

The importance of sulfate respiration in the microbial mat found in the low-sulfate thermal outflow of Mushroom Spring in Yellowstone National Park was evaluated using a combination of molecular, microelectrode, and radiotracer studies. Despite very low sulfate concentrations, this mat community was shown to sustain a highly active sulfur cycle. The highest rates of sulfate respiration were measured close to the surface of the mat late in the day when photosynthetic oxygen production ceased and were associated with a Thermodesulfovibrio-like population. Reduced activity at greater depths was correlated with novel populations of sulfate-reducing microorganisms, unrelated to characterized species, and most likely due to both sulfate and carbon limitation.

* Corresponding author. Present address: Department of Biological Sciences, California State University, Long Beach, CA 90840. Phone: (562) 985-4824. Fax: (562) 985-8878. E-mail: jdillon{at}csulb.edu

{triangledown} Published ahead of print on 15 June 2007.

Applied and Environmental Microbiology, August 2007, p. 5218-5226, Vol. 73, No. 16
0099-2240/07/$08.00+0     doi:10.1128/AEM.00357-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Ramamoorthy, S., Piotrowski, J. S., Langner, H. W., Holben, W. E., Morra, M. J., Rosenzweig, R. F. (2009). Ecology of Sulfate-Reducing Bacteria in an Iron-Dominated, Mining-Impacted Freshwater Sediment. J. Environ. Qual. 38: 675-684 [Abstract] [Full Text]  


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