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  • 1
    Online Resource
    Online Resource
    Subseafloor Biosphere Linked to Hydrothermal Systems : TAIGA Concept (2015)
    Tokyo : Springer Japan
    Details Availability
    Keywords: Electronic books
    Description / Table of Contents: Intro -- Preface -- Editorial Board -- Acknowledgments -- List of External Reviewers -- Contents -- Part I: Interdisciplinary Studies -- Chapter 1: Introduction of TAIGA Concept -- 1.1 Subseafloor Biosphere and Hydrosphere -- 1.2 Hydrothermal Systems as a Window of Sub-seafloor TAIGAs -- 1.3 Diversity of Subseafloor TAIGAs -- 1.3.1 TAIGA of Hydrogen -- 1.3.2 TAIGA of Methane -- 1.3.3 TAIGA of Sulfur -- 1.3.4 TAIGA of Iron -- 1.4 Interdisciplinary Studies During TAIGA Project -- References -- Chapter 2: Geochemical Constraints on Potential Biomass Sustained by Subseafloor Water-Rock Interactions -- 2.1 Introduction -- 2.2 Method to Estimate the Potential Biomass Sustained by Chemosynthetic Primary Production -- 2.2.1 Deep-Sea Hydrothermal Vent Communities -- 2.2.2 Subseafloor Basaltic Oceanic Crust Communities -- 2.3 Potential Biomass Sustained by High-Temperature Deep-Sea Hydrothermal Systems -- 2.3.1 Geochemical Characteristics of Deep-Sea Hydrothermal Fluids -- 2.3.2 Bioavailable Energy Yield from Deep-Sea Hydrothermal Fluids -- 2.3.3 Fluxes of Deep-Sea Hydrothermal Fluids -- 2.3.4 Biomass Potential in Deep-Sea Hydrothermal Vent Ecosystems -- 2.4 Potential Biomass Sustained by Low-Temperature Alteration/Weathering of Oceanic Crust -- 2.4.1 Processes and Fluxes of Elemental Exchange Between Seawater and Oceanic Crust During Low-Temperature Alteration/Weatheri... -- 2.4.1.1 Iron -- 2.4.1.2 Sulfur -- 2.4.2 Bioavailable Energy Yield from Low-Temperature Alteration/Weathering of Oceanic Crust -- 2.4.3 Biomass Potential in Oceanic Crust Ecosystems -- 2.5 Microbial Biomass Potentials Associated with Fluid Flows in Ocean and Oceanic Crust and the Impact on Global Geochemical C... -- References -- Chapter 3: Microbial Cell Densities, Community Structures, and Growth in the Hydrothermal Plumes of Subduction Hydrothermal Sy.
    Type of Medium: Online Resource
    Pages: 1 online resource (651 pages)
    ISBN: 9784431548652
    URL: https://ebookcentral.proquest.com/lib/kxp/detail.action?docID=6422532
    Language: English
    Note: Description based on publisher supplied metadata and other sources
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  • 2
    Electronic Resource
    Electronic Resource
    Microbial diversity in hydrothermal surface to subsurface environments of Suiyo Seamount, Izu-Bonin Arc, using a catheter-type in situ growth chamber (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 47 (2004), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: After excavation using a portable submarine driller near deep-sea hydrothermal vents in the Suiyo Seamount, Izu-Bonin Arc, microbial diversity was examined in samples collected from inside the boreholes using an in situ growth chamber called a vent catheter. This instrument, which we devised for this study, consists of a heat-tolerant pipe tipped with a titanium mesh entrapment capsule that is packed with sterilized inorganic porous grains, which serve as an adhesion substrate. After this instrument was deployed inside each of the boreholes, as well as a natural vent, for 3–10 days in the vicinity of hot vent fluids (maxima: 156–305°C), DNA was extracted from the adhesion grains, 16S rDNA was amplified, and randomly selected clones were sequenced. In phylogenetic analysis of more than 120 clones, several novel phylotypes were detected within the ε-Proteobacteria, photosynthetic bacteria (PSB)-related α-Proteobacteria, and Euryarchaeota clusters. Members of ε-Proteobacteria were frequently encountered. Half of these were classified between two known groups, Corre's B and D. The other half of the clones were assigned to new groups, SSSV-BE1 and SSSV-BE2 (Suiyo Seamount sub-vent origin, Bacteria domain, ε-Proteobacteria, groups 1 and 2). From this hydrothermal vent field, we detected a novel lineage within the PSB cluster, SSNV-BA1 (Suiyo Seamount natural vent origin, Bacteria domain, α-Proteobacteria, group 1), which is closely related to Rhodopila globiformis isolated from a hot spring. A number of archaeal clones were also detected from the borehole samples. These clones formed a novel monophyletic clade, SSSV-AE1 (Suiyo Seamount sub-vent origin, Archaea domain, Euryarchaeota, group 1), approximately between methanogenic hyperthermophilic members of Methanococcales and environmental clone members of DHVE Group II. Thus, this hydrothermal vent environment appears to be a noteworthy microbial and genetic resource. It is also noteworthy that some of the findings presented here were made possible by the application of the in situ growth chamber into the hot fluids deep inside the boreholes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0168-6496(04)00004-2
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  • 3
    Electronic Resource
    Electronic Resource
    Biomass Measurement of Methanogens in the Sediments of Tokyo Bay Using Archaeol Lipids (1999)
    Springer
    Marine biotechnology 1 (1999), S. 562-568 
    Details
    ISSN: 1436-2236
    Keywords: Key words: Archaeol, biomass measurement, methanogen, sediment, Tokyo Bay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract: An archaeal ether-linked lipid, archaeol, was determined to be a biomass indicator for methanogens both in the laboratory enriched culture and in marine sediments. The archaeol measurement method described by Ohtsubo et al. in 1993 was modified and applied to marine sediments. We compared the amount of archaeol with the cell number of methanogens or methane concentration in laboratory enriched culture of methanogens from marine sediment. Good correlations were obtained as follows: (Methane, mmol) = 11.2 × (Archaeol, mg): r= .996 or (Cell number) = 1.13 × 1011× (Archaeol, mg): r= .995, respectively. In the sediments of Tokyo Bay, archaeol was measured from approximately 46 to 561 ng/dry g sediment at the entrance to 267 to 4160 ng/dry g sediment at the innermost area. Using the coefficient from the laboratory experiment, these data corresponded to cell numbers of 5.2 × 106 to 4.7 × 108/dry g sediment. These values were 1 or 2 orders of magnitude higher than those obtained by culture methods in previous studies. Although dead or decomposed cells might be detected, archaeol measurement is useful for estimating the biomass of methanogens because of the good correlation between methane concentration and archaeol content in marine environments. In this study, we found a correlation of (Methane, mmol) = 0.012 × (Archaeol, mg): r= .932, n= 17 in marine sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011811
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    Paper (German National Licenses)
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  • 4
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    Metabolically active microbial communities in marine sediment under high-CO2 and low-pH extremes (2013)
    Nature Publishing Group
    In:  The ISME Journal, 7 . pp. 555-567.
    Details
    Publication Date: 2019-09-23
    Description: Sediment-hosting hydrothermal systems in the Okinawa Trough maintain a large amount of liquid, supercritical and hydrate phases of CO2 in the seabed. The emission of CO2 may critically impact the geochemical, geophysical and ecological characteristics of the deep-sea sedimentary environment. So far it remains unclear whether microbial communities that have been detected in such high-CO2 and low-pH habitats are metabolically active, and if so, what the biogeochemical and ecological consequences for the environment are. In this study, RNA-based molecular approaches and radioactive tracer-based respiration rate assays were combined to study the density, diversity and metabolic activity of microbial communities in CO2-seep sediment at the Yonaguni Knoll IV hydrothermal field of the southern Okinawa Trough. In general, the number of microbes decreased sharply with increasing sediment depth and CO2 concentration. Phylogenetic analyses of community structure using reverse-transcribed 16S ribosomal RNA showed that the active microbial community became less diverse with increasing sediment depth and CO2 concentration, indicating that microbial activity and community structure are sensitive to CO2 venting. Analyses of RNA-based pyrosequences and catalyzed reporter deposition-fluorescence in situ hybridization data revealed that members of the SEEP-SRB2 group within the Deltaproteobacteria and anaerobic methanotrophic archaea (ANME-2a and -2c) were confined to the top seafloor, and active archaea were not detected in deeper sediments (13–30 cm in depth) characterized by high CO2. Measurement of the potential sulfate reduction rate at pH conditions of 3–9 with and without methane in the headspace indicated that acidophilic sulfate reduction possibly occurs in the presence of methane, even at very low pH of 3. These results suggest that some members of the anaerobic methanotrophs and sulfate reducers can adapt to the CO2-seep sedimentary environment; however, CO2 and pH in the deep-sea sediment were found to severely impact the activity and structure of the microbial community.
    Type: Article , PeerReviewed
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    Format: other
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    DOI: 10.1038/ismej.2012.124
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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