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Epsilonproteobacteria Represent the Major Portion of Chemoautotrophic Bacteria in Sulfidic Waters of Pelagic Redoxclines of the Baltic and Black Seas
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| Zeitschriftentitel: | Applied and Environmental Microbiology |
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| Personen und Körperschaften: | , , , , |
| In: | Applied and Environmental Microbiology, 74, 2008, 24, S. 7546-7551 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Society for Microbiology
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| Schlagwörter: |
| Zusammenfassung: | <jats:title>ABSTRACT</jats:title> <jats:p> Recent studies have indicated that chemoautotrophic <jats:italic>Epsilonproteobacteria</jats:italic> might play an important role, especially as anaerobic or microaerophilic dark CO <jats:sub>2</jats:sub> -fixing organisms, in marine pelagic redoxclines. However, knowledge of their distribution and abundance as actively CO <jats:sub>2</jats:sub> -fixing microorganisms in pelagic redoxclines is still deficient. We determined the contribution of <jats:italic>Epsilonproteobacteria</jats:italic> to dark CO <jats:sub>2</jats:sub> fixation in the sulfidic areas of central Baltic Sea and Black Sea redoxclines by combining catalyzed reporter deposition-fluorescence in situ hybridization with microautoradiography using [ <jats:sup>14</jats:sup> C]bicarbonate and compared it to the total prokaryotic chemoautotrophic activity. In absolute numbers, up to 3 × 10 <jats:sup>5</jats:sup> <jats:sup>14</jats:sup> CO <jats:sub>2</jats:sub> -fixing prokaryotic cells ml <jats:sup>−1</jats:sup> were enumerated in the redoxcline of the central Baltic Sea and up to 9 × 10 <jats:sup>4</jats:sup> <jats:sup>14</jats:sup> CO <jats:sub>2</jats:sub> -fixing cells ml <jats:sup>−1</jats:sup> were enumerated in the Black Sea redoxcline, corresponding to 29% and 12%, respectively, of total cell abundance. <jats:sup>14</jats:sup> CO <jats:sub>2</jats:sub> -incorporating cells belonged exclusively to the domain <jats:italic>Bacteria</jats:italic> . Among these, members of the <jats:italic>Epsilonproteobacteria</jats:italic> were approximately 70% of the cells in the central Baltic Sea and up to 100% in the Black Sea. For the Baltic Sea, the <jats:italic>Sulfurimonas</jats:italic> subgroup GD17, previously assumed to be involved in autotrophic denitrification, was the most dominant CO <jats:sub>2</jats:sub> -fixing group. In conclusion, <jats:italic>Epsilonproteobacteria</jats:italic> were found to be mainly responsible for chemoautotrophic activity in the dark CO <jats:sub>2</jats:sub> fixation maxima of the Black Sea and central Baltic Sea redoxclines. These <jats:italic>Epsilonproteobacteria</jats:italic> might be relevant in similar habitats of the world's oceans, where high dark CO <jats:sub>2</jats:sub> fixation rates have been measured. </jats:p> |
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| Umfang: | 7546-7551 |
| ISSN: |
0099-2240
1098-5336 |
| DOI: | 10.1128/aem.01186-08 |