Abstract
Enrichment cultures containing marine plankton from oxygenated coastal waters (50–108% saturated) with supersaturated levels of methane (>700% saturated) yielded a strictly anaerobic methanogenic bacterium. Nonmotile, non-spore-forming, regular to slightly irregular cocci (0.5–0.8µm) were evident by phase contrast, epifluorescence, and scanning electron microscopies. The unpurified isolate required NaCl for growth, with maximal methanogenesis at 240 mM NaCl at 22°C. The optimal temperature range for growth was 22–31°C, and the optimal range for methanogenesis was 26–35°C. Mono-, di-, and trimethylated amines or methanol were substrates for methanogenesis; sodium acetate and H2:CO2 were not. The DNA base composition was 42 ±1% guanine plus cytosine. Serology suggested the isolate may be a new strain ofMethanococcoides methylutens. Morphology, growth physiology, DNA base content, and serology are all consistent with the type description ofM. methylutens, a methylotrophic methanogen isolated from submarine sediments.
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Cynar, F.J., Yayanos, A.A. Enrichment and characterization of a methanogenic bacterium from the oxic upper layer of the ocean. Current Microbiology 23, 89–96 (1991). https://doi.org/10.1007/BF02092256
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DOI: https://doi.org/10.1007/BF02092256