Survey of motile microaerophilic bacterial morphotypes in the oxygen gradient above a marine sulfidic sediment |
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Authors: | Thar Roland Fenchel Tom |
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Affiliation: | Marine Biological Laboratory, University of Copenhagen, Strandpromenaden 5, 3000 Helsing?r, Denmark. rthar@bi.ku.dk |
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Abstract: | Enrichment cultures for free-swimming microaerophilic bacteria were prepared from marine sulfidic sediment samples (Niv? 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 muM. The motile behavior and flagellar dynamics are analyzed in detail with an emphasis on spirilla. |
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