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Applied and Environmental Microbiology, June 2003, p. 3663-3667, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3663-3667.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Linkage of High Rates of Sulfate Reduction in Yellowstone Hot Springs to Unique Sequence Types in the Dissimilatory Sulfate Respiration Pathway

Susan Fishbain, Jesse G. Dillon,{dagger} Heidi L. Gough, and David A. Stahl{dagger}*

Department of Civil Engineering, Northwestern University, Evanston, Illinois 60208

Received 8 October 2002/ Accepted 20 March 2003

Diversity, habitat range, and activities of sulfate-reducing prokaryotes within hot springs in Yellowstone National Park were characterized using endogenous activity measurements, molecular characterization, and enrichment. Five major phylogenetic groups were identified using PCR amplification of the dissimilatory sulfite reductase genes (dsrAB) from springs demonstrating significant sulfate reduction rates, including a warm, acidic (pH 2.5) stream and several nearly neutral hot springs with temperatures reaching 89°C. Three of these sequence groups were unrelated to named lineages, suggesting that the diversity and habitat range of sulfate-reducing prokaryotes exceeds that now represented in culture.

* Corresponding author. Present address: Department of Civil and Environmental Engineering, University of Washington, 309 More Hall, P.O. Box 352700, Seattle, WA 98195-2700. Phone: (206) 685-3464. Fax: (206) 685-9185. E-mail: dastahl{at}u.washington.edu.

{dagger} Present address: Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195.

Applied and Environmental Microbiology, June 2003, p. 3663-3667, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3663-3667.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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