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  Mats of psychrophilic thiotrophic bacteria associated with cold seeps of the Barents Sea

Grünke, S., Lichtschlag, A., de Beer, D., Felden, J., Salman, V., Ramette, A., et al. (2012). Mats of psychrophilic thiotrophic bacteria associated with cold seeps of the Barents Sea. Biogeosciences, 9(8), 2947-2960.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-C8AF-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-638F-9
Genre: Journal Article

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 Creators:
Grünke, S.1, Author              
Lichtschlag, A.1, Author              
de Beer, D.2, Author              
Felden, J.1, Author              
Salman, V.3, Author              
Ramette, A.1, Author              
Schulz-Vogt, H. N.4, Author              
Boetius, A.1, Author              
Affiliations:
1HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
2Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              
3Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481695              
4Ecophysiology Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481700              

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 Abstract: 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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Language(s): eng - English
 Dates: 2012
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 634816
ISI: 000308290200010
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Title: Biogeosciences
  Other : Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 9 (8) Sequence Number: - Start / End Page: 2947 - 2960 Identifier: ISSN: 1726-4170
CoNE: https://pure.mpg.de/cone/journals/resource/111087929276006