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Applied and Environmental Microbiology, March 2003, p. 1832-1835, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1832-1835.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Evidence for the Existence of Psychrophilic Methanogenic Communities in Anoxic Sediments of Deep Lakes

Alla N. Nozhevnikova,1,2 Kornelia Zepp,2 Francisco Vazquez,2 Alexander J. B. Zehnder,3 and Christof Holliger2*

Institute of Microbiology, Russian Academy of Sciences, Moscow, Russia,1 Limnological Research Center, Swiss Federal Institute for Environmental Science and Technology (EAWAG), 6047 Kastanienbaum,2 Swiss Federal Institute for Environmental Science and Technology (EAWAG), 8600 Dübendorf, Switzerland3

Received 12 August 2002/ Accepted 25 November 2002

In order to obtain evidence for the existence of psychrophilic methanogenic communities in sediments of deep lakes that are low-temperature environments (4 to 5°C), slurries were first incubated at temperatures between 4 and 60°C for several weeks, at which time they were amended, or not, with an additional substrate, such as cellulose, butyrate, propionate, acetate, or hydrogen, and further incubated at 6°C. Initial methane production rates were highest in slurries preincubated at temperatures between 4 and 15°C, with maximal rates in slurries kept at 6°C. Hydrogen-amended cultures were the only exceptions, with the highest methane production rates at 6°C after preincubation at 30°C.

* Corresponding author. Mailing address: EPFL, ENAC-ISTE Laboratory for Environmental Biotechnology, BÂtiment Chimie—Ecublens, CH-1015 Lausanne, Switzerland. Phone: 41-21-6934724. Fax: 41-21-6934722. E-mail: christof.holliger{at}epfl.ch.

Applied and Environmental Microbiology, March 2003, p. 1832-1835, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1832-1835.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.





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