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| Titel |
Bacterial diversity and biogeochemistry of different chemosynthetic habitats of the REGAB cold seep (West African margin, 3160 m water depth) |
| VerfasserIn |
P. Pop Ristova, F. Wenzhöfer, A. Ramette, M. Zabel, D. Fischer, S. Kasten, 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. 12 ; Nr. 9, no. 12 (2012-12-07), S.5031-5048 |
| Datensatznummer |
250007455
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| Publikation (Nr.) |
 copernicus.org/bg-9-5031-2012.pdf |
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| Zusammenfassung |
| The giant pockmark REGAB (West African margin, 3160 m water depth) is an
active methane-emitting cold seep ecosystem, where the energy derived from
microbially mediated oxidation of methane supports high biomass and
diversity of chemosynthetic communities. Bare sediments interspersed with
heterogeneous chemosynthetic assemblages of mytilid mussels, vesicomyid
clams and siboglinid tubeworms form a complex seep ecosystem. To better
understand if benthic bacterial communities reflect the patchy distribution
of chemosynthetic fauna, all major chemosynthetic habitats at REGAB were
investigated using an interdisciplinary approach combining pore water
geochemistry, in situ quantification of fluxes and consumption of methane, as well
as bacterial community fingerprinting. This study revealed that sediments
populated by different fauna assemblages show distinct biogeochemical
activities and are associated with distinct sediment bacterial communities.
The methane consumption rates and methane effluxes ranged over one to two
orders of magnitude across habitats, and reached highest values at the
mussel habitat, which hosted a different bacterial community compared to the
other habitats. Clam assemblages had a profound impact on the sediment
geochemistry, but less so on the bacterial community structure. Moreover,
all clam assemblages at REGAB were restricted to sediments characterized by
complete methane consumption in the seafloor, and intermediate
biogeochemical activity. Overall, variations in the sediment geochemistry
were reflected in the distribution of both fauna and microbial communities;
and were mostly determined by methane flux. |
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