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  • 1
    Electronic Resource
    Electronic Resource
    In situ experimental evidence of the fate of a phytodetritus pulse at the abyssal sea floor (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 424 (2003), S. 763-766 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] More than 50% of the Earth' s surface is sea floor below 3,000 m of water. Most of this major reservoir in the global carbon cycle and final repository for anthropogenic wastes is characterized by severe food limitation. Phytodetritus is the major food source for abyssal benthic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01799
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    Paper (German National Licenses)
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  • 2
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    Microbial Reefs in the Black Sea Fueled by Anaerobic Oxidation of Methane (2002)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 297 (5583). pp. 1013-1015.
    Details
    Publication Date: 2017-07-07
    Description: Massive microbial mats covering up to 4-meter-high carbonate buildups prosper at methane seeps in anoxic waters of the northwestern Black Sea shelf. Strong 13C depletions indicate an incorporation of methane carbon into carbonates, bulk biomass, and specific lipids. The mats mainly consist of densely aggregated archaea (phylogenetic ANME-1 cluster) and sulfate-reducing bacteria (Desulfosarcina/Desulfococcusgroup). If incubated in vitro, these mats perform anaerobic oxidation of methane coupled to sulfate reduction. Obviously, anaerobic microbial consortia can generate both carbonate precipitation and substantial biomass accumulation, which has implications for our understanding of carbon cycling during earlier periods of Earth's history.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1126/science.1072502
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Activity, distribution, and diversity of sulfate reducers and other bacteria in sediments above gas hydrate (Cascadia Margin, Oregon) (2003)
    Taylor & Francis
    In:  Geomicrobiology Journal, 20 . pp. 269-294.
    Details
    Publication Date: 2019-09-23
    Description: Cold seep environments such as sediments above outcropping hydrate at Hydrate Ridge (Cascadia margin off Oregon) are characterized by methane venting, high sulfide fluxes caused by the anaerobic oxidation of methane, and the presence of chemosynthetic communities. Recent investigations showed that another characteristic feature of cold seeps is the occurrence of methanotrophic archaea, which can be identified by specific biomarker lipids and 16S rDNA analysis. This investigation deals with the diversity and distribution of sulfate-reducing bacteria, some of which are directly involved in the anaerobic oxidation of methane as syntrophic partners of the methanotrophic archaea. The composition and activity of the microbial communities at methane vented and nonvented sediments are compared by quantitative methods including total cell counts, fluorescence in situ hybridization (FISH), bacterial production, enzyme activity, and sulfate reduction rates. Bacteria involved in the degradation of particulate organic carbon (POC) are as active and diverse as at other productive margin sites of similar water depths. The availability of methane supports a two orders of magnitude higher microbial biomass (up to 9.6 2 10 10 cells cm m 3 ) and sulfate reduction rates (up to 8 w mol cm m 3 d m 1 ) in hydrate-bearing sediments, as well as a high bacterial diversity, especially in the group of i -proteobacteria including members of the branches Desulfosarcina/Desulfococcus , Desulforhopalus , Desulfobulbus , and Desulfocapsa . Most of the diversity of sulfate-reducing bacteria in hydrate-bearing sediments comprises seep-endemic clades, which share only low similarities with previously cultured bacteria.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/01490450303896
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Microbial Systems in Sedimentary Environments of Continental Margins (2003)
    Springer
    In:  In: Ocean Margin Systems. , ed. by Wefer, G., Billett, D., Hebbeln, D., Jørgensen, B. B., Schlüter, M. and van Weering, T. C. E. Springer, Berlin, Germany, pp. 479-495.
    Details
    Publication Date: 2020-04-27
    Description: The zone of continental margins is most important for the ocean’s productivity and nutrient budget and connects the flow of material from terrestrial environments to the deep-sea. Microbial processes are an important “filter” in this exchange between sediments and ocean interior. As a consequence of the variety of habitats and special environmental conditions at continental margins an enormous diversity of microbial processes and microbial life forms is found. The only definite limit to microbial life in sedimentary systems of continental margins appears to be high temperatures in the interior earth or in fluids rising from the interior. Many of the catalytic capabilities which microorganisms possess are still only incompletely explored and appear to continuously expand as new organisms are discovered. Recent discoveries at continental margins such as the microbial life in the deep sub-seafloor, microbial utilization of hydrate deposits, highly specialized microbial symbioses and the involvement of microbial processes in the formation of carbonate mounds have extended our understanding of the Earth’s bio- and geosphere dramatically. The aim of this paper is to identify important scientific issues for future research on microbial life in sedimentary environments of continental margins.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1007/978-3-662-05127-6_29
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    OceanRep: Book chapter
  • 5
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    In situ experimental evidence of the fate of a phytodetritus pulse at the abyssal sea floor (2003)
    Nature Publishing Group
    In:  Nature, 424 . pp. 763-765.
    Details
    Publication Date: 2017-03-07
    Description: More than 50% of the Earth' s surface is sea floor below 3,000 m of water. Most of this major reservoir in the global carbon cycle and final repository for anthropogenic wastes is characterized by severe food limitation. Phytodetritus is the major food source for abyssal benthic communities, and a large fraction of the annual food load can arrive in pulses within a few days1, 2. Owing to logistical constraints, the available data concerning the fate of such a pulse are scattered3, 4 and often contradictory5, 6, 7, 8, 9, 10, hampering global carbon modelling and anthropogenic impact assessments. We quantified (over a period of 2.5 to 23 days) the response of an abyssal benthic community to a phytodetritus pulse, on the basis of 11 in situ experiments. Here we report that, in contrast to previous hypotheses5, 6, 7, 8, 9, 10, 11, the sediment community oxygen consumption doubled immediately, and that macrofauna were very important for initial carbon degradation. The retarded response of bacteria and Foraminifera, the restriction of microbial carbon degradation to the sediment surface, and the low total carbon turnover distinguish abyssal from continental-slope ‘deep-sea’ sediments.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/nature01799
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Effects of a deep-sea mining experiment on seafloor microbial communities and functions after 26 years (2020)
    AAAS (American Association for the Advancement of Science)
    Details
    Publication Date: 2023-02-08
    Description: Future supplies of rare minerals for global industries with high-tech products may depend on deep-sea mining. However, environmental standards for seafloor integrity and recovery from environmental impacts are missing. We revisited the only midsize deep-sea disturbance and recolonization experiment carried out in 1989 in the Peru Basin nodule field to compare habitat integrity, remineralization rates, and carbon flow with undisturbed sites. Plough tracks were still visible, indicating sites where sediment was either removed or compacted. Locally, microbial activity was reduced up to fourfold in the affected areas. Microbial cell numbers were reduced by ~50% in fresh “tracks” and by 〈30% in the old tracks. Growth estimates suggest that microbially mediated biogeochemical functions need over 50 years to return to undisturbed levels. This study contributes to developing environmental standards for deep-sea mining while addressing limits to maintaining and recovering ecological integrity during large-scale nodule mining.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Microbial systems in sedimentary environments of continental margins (2002)
    Springer
    Details
    Publication Date: 2022-02-18
    Description: The zone of continental margins is most important for the ocean’s productivity and nutrient budget and connects the flow of material from terrestrial environments to the deep-sea. Microbial processes are an important “filter” in this exchange between sediments and ocean interior. As a consequence of the variety of habitats and special environmental conditions at continental margins an enormous diversity of microbial processes and microbial life forms is found. The only definite limit to microbial life in sedimentary systems of continental margins appears to be high temperatures in the interior earth or in fluids rising from the interior. Many of the catalytic capabilities which microorganisms possess are still only incompletely explored and appear to continuously expand as new organisms are discovered. Recent discoveries at continental margins such as the microbial life in the deep sub-seafloor, microbial utilization of hydrate deposits, highly specialized microbial symbioses and the involvement of microbial processes in the formation of carbonate mounds have extended our understanding of the Earth’s bio- and geosphere dramatically. The aim of this paper is to identify important scientific issues for future research on microbial life in sedimentary environments of continental margins.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 8
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    A marine microbial consortium apparently mediating abaerobic oxidation of methane (2000)
    Nature Publishing Group
    In:  Nature, 407 . pp. 623-626.
    Details
    Publication Date: 2017-02-28
    Description: A large fraction of globally produced methane is converted to CO2 by anaerobic oxidation in marine sediments. Strong geochemical evidence for net methane consumption in anoxic sediments is based on methane profiles, radiotracer experiments and stable carbon isotope data. But the elusive microorganisms mediating this reaction have not yet been isolated, and the pathway of anaerobic oxidation of methane is insufficiently understood. Recent data suggest that certain archaea reverse the process of methanogenesis by interaction with sulphate-reducing bacteria. Here we provide microscopic evidence for a structured consortium of archaea and sulphate-reducing bacteria, which we identified by fluorescence in situ hybridization using specific 16S rRNA-targeted oligonucleotide probes. In this example of a structured archaeal-bacterial symbiosis, the archaea grow in dense aggregates of about 100 cells and are surrounded by sulphate-reducing bacteria. These aggregates were abundant in gas-hydrate-rich sediments with extremely high rates of methane-based sulphate reduction, and apparently mediate anaerobic oxidation of methane.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/35036572
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Control of sulfate pore-water profiles by sedimentary events and the significance of anaerobic oxidation of methane for the burial of sulfur in marine sediments (2003)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 67 . pp. 2631-2647.
    Details
    Publication Date: 2017-08-28
    Description: Gravity driven mass-flow deposits proven by sedimentary and digital echosounder data are indicative for prevailing dynamic sedimentary conditions along the continental margin of the western Argentine Basin. In this study we present geochemical data from a total of 23 gravity cores. Pore-water SO4 is generally depleted within a few meters below the sediment surface by anaerobic oxidation of methane (AOM). The different shapes of SO4 profiles (concave, kink- and s-type) can be consistently explained by sedimentary slides possibly in combination with changes in the CH4 flux from below, thus, mostly representing transient pore-water conditions. Since slides may keep their original sedimentary signature, a combined analysis and numerical modeling of geochemical, physical properties, and hydro acoustic data could be applied in order to reconstruct the sedimentary history. We present first order estimates of the dating of sedimentary events for an area where conventional stratigraphic methods failed to this day. The results of the investigated sites suggest that present day conditions are the result of events that occurred decades to thousands of years ago and promote a persisting mass transport from the shelf into the deep-sea, depositing high amounts of reactive compounds. The high abundance of reactive iron phases in this region maintains low hydrogen sulfide levels in the sediments by a nearly quantitative precipitation of all reduced sulfate by AOM. For the total region we estimate a SO4 (or CH4) flux of 6.6 × 1010 moles per year into the zone of AOM. Projected to the global continental slope and rise area, this may sum up to about 2.6 × 1012 moles per year. Provided that the sulfur is completely fixed in the sediments it is about twice the global value of the recent global sulfur burial in marine sediments of 1.2 × 1012 moles per year as previously estimated. Thus, AOM obviously contributes very significantly to the regulation of global sulfur reservoirs, which is hitherto not sufficiently recognized. This finding may have implications for global geochemical models, as sulfur burial is an important control factor in the development of atmospheric oxygen levels over time.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0016-7037(03)00199-6
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Sulfate reduction and anaerobic oxidation of methane in hydrothermal sediments of Guaymas Basin (2004)
    In:  Geochimica et Cosmochimica Acta
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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