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Applied and Environmental Microbiology, September 1999, p. 4230-4233, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Community Size and Metabolic Rates of Psychrophilic Sulfate-Reducing Bacteria in Arctic Marine Sediments

Christian Knoblauch,1,* Bo Barker Jørgensen,1 and Jens Harder2

Departments of Biogeochemistry1 and Microbiology,2 Max Planck Institute for Marine Microbiology, D-28359 Bremen, Germany

Received 11 March 1999/Accepted 2 July 1999

The numbers of sulfate reducers in two Arctic sediments with in situ temperatures of 2.6 and -1.7°C were determined. Most-probable-number counts were higher at 10°C than at 20°C, indicating the predominance of a psychrophilic community. Mean specific sulfate reduction rates of 19 isolated psychrophiles were compared to corresponding rates of 9 marine, mesophilic sulfate-reducing bacteria. The results indicate that, as a physiological adaptation to the permanently cold Arctic environment, psychrophilic sulfate reducers have considerably higher specific metabolic rates than their mesophilic counterparts at similarly low temperatures.

* Corresponding author. Mailing address: Max Planck Institute for Marine Microbiology, Celsiusstr. 1, D-28359 Bremen, Germany. Phone: 49 421 2028 653. Fax: 49 421 2028 690. E-mail: cknoblau{at}mpi-bremen.de.

Applied and Environmental Microbiology, September 1999, p. 4230-4233, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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