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Applied and Environmental Microbiology, October 2000, p. 4532-4535, Vol. 66, No. 10
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Pacific Northwest Marine Sediments Contain Ammonia-Oxidizing Bacteria in the beta  Subdivision of the Proteobacteria

Stephen C. Nold,1,2,* Jizhong Zhou,3 Allan H. Devol,4 and James M. Tiedje1,2

Center for Microbial Ecology1 and Department of Crop and Soil Sciences,2 Michigan State University, East Lansing, Michigan 48824; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 378313; and School of Oceanography, University of Washington, Seattle, Washington, 982954

Received 14 February 2000/Accepted 8 August 2000

The diversity of ammonia-oxidizing bacteria in aquatic sediments was studied by retrieving ammonia monooxygenase and methane monooxygenase gene sequences. Methanotrophs dominated freshwater sediments, while beta -proteobacterial ammonia oxidizers dominated marine sediments. These results suggest that gamma -proteobacteria such as Nitrosococcus oceani are minor members of marine sediment ammonia-oxidizing communities.

* Corresponding author. Present address: Department of Biology, University of Wisconsin-Stout, Menomonie, WI 54751-0790. Phone: (715) 232-2560. Fax: (715) 232-2192. E-mail: nolds{at}uwstout.edu.

Applied and Environmental Microbiology, October 2000, p. 4532-4535, Vol. 66, No. 10
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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