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| Titel |
Mats of psychrophilic thiotrophic bacteria associated with cold seeps of the Barents Sea |
| VerfasserIn |
S. Grünke, A. Lichtschlag, D. Beer, J. Felden, V. Salman, A. Ramette, H. N. Schulz-Vogt, A. Boetius  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 8 ; Nr. 9, no. 8 (2012-08-06), S.2947-2960 |
| Datensatznummer |
250007228
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| Publikation (Nr.) |
 copernicus.org/bg-9-2947-2012.pdf |
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| Zusammenfassung |
| This study investigated the bacterial diversity associated with microbial
mats of polar deep-sea cold seeps. The mats were associated with high upward
fluxes of sulfide produced by anaerobic oxidation of methane, and grew at
temperatures close to the freezing point of seawater. They ranged from small
patches of 0.2–5 m in diameter (gray mats) to extensive fields covering up
to 850 m2 of seafloor (white mats) and were formed by diverse
sulfide-oxidizing bacteria differing in color and size. Overall, both the
dominant mat-forming thiotrophs as well as the associated bacterial
communities inhabiting the mats differed in composition for each mat type as
determined by microscopy, 16S rRNA gene sequencing and automated ribosomal
intergenic spacer analysis. While the smaller gray mats were associated with
a highly diverse composition of sulfide oxidizers, the larger white mats
were composed of only 1–2 types of gliding Beggiatoa filaments. Molecular analyses
showed that most of the dominant mat-forming sulfide oxidizers were
phylogenetically different from, but still closely related to, thiotrophs
known from warmer ocean realms. The psychrophilic nature of the polar
mat-forming thiotrophs was tested by visual observation of active mats at
in situ temperature compared to their warming to >4 °C. The temperature range
of mat habitats and the variation of sulfide and oxygen fluxes appear to be
the main factors supporting the diversity of mat-forming thiotrophs in cold
seeps at continental margins. |
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