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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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