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Applied and Environmental Microbiology, October 2003, p. 6000-6006, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6000-6006.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Compound-Specific Isotopic Fractionation Patterns Suggest Different Carbon Metabolisms among Chloroflexus-Like Bacteria in Hot-Spring Microbial Mats{dagger}

Marcel T. J. van der Meer,1* Stefan Schouten,1 Jaap S. Sinninghe Damsté,1 Jan W. de Leeuw,1 and David M. Ward2

Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute for Sea Research, 1790 AB Den Burg, Texel, The Netherlands,1 Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 597172

Received 28 April 2003/ Accepted 25 July 2003

Stable carbon isotope fractionations between dissolved inorganic carbon and lipid biomarkers suggest photoautotrophy by Chloroflexus-like organisms in sulfidic and nonsulfidic Yellowstone hot springs. Where co-occurring, cyanobacteria appear to cross-feed Chloroflexus-like organisms supporting photoheterotrophy as well, although the relatively small 13C fractionation associated with cyanobacterial sugar biosynthesis may sometimes obscure this process.

* Corresponding author. Mailing address: Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands. Phone: (31) 222-369565. Fax: (31) 222-319674. E-mail: mmeer{at}nioz.nl.

{dagger} NIOZ contribution no. 3630; journal series no. 2003-27, Montana Agricultural Experiment Station, Montana State University—Bozeman.

Applied and Environmental Microbiology, October 2003, p. 6000-6006, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6000-6006.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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