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Applied and Environmental Microbiology, July 2005, p. 3682-3691, Vol. 71, No. 7
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.7.3682-3691.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Survey of Motile Microaerophilic Bacterial Morphotypes in the Oxygen Gradient above a Marine Sulfidic Sediment

Roland Thar* and Tom Fenchel

Marine Biological Laboratory, University of Copenhagen, Strandpromenaden 5, 3000 Helsingør, Denmark

Received 4 August 2004/ Accepted 31 January 2005

Enrichment cultures for free-swimming microaerophilic bacteria were prepared from marine sulfidic sediment samples (Nivå Bay, Denmark). We observed nine different morphotypes; three of these morphotypes represented already-described species, i.e., Thiovulum majus, "Candidatus Ovobacter propellens," and an as-yet-unnamed large vibrioid bacterium. In addition, we observed several morphotypes of spirilla and one vibrioid morphotype. A common feature of all investigated bacteria was that they aggregated chemotactically at the oxic-anoxic interface, whereas preferred oxygen concentration were in the range of 1 to 10 µM. The motile behavior and flagellar dynamics are analyzed in detail with an emphasis on spirilla.

* Corresponding author. Mailing address: Marine Biological Laboratory, University of Copenhagen, Strandpromenaden 5, 3000 Helsingør, Denmark. Phone: 45-49-21-33-44. Fax: 45-49-26-11-65. E-mail: rthar{at}bi.ku.dk.

Applied and Environmental Microbiology, July 2005, p. 3682-3691, Vol. 71, No. 7
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.7.3682-3691.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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