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  • 1
    Electronic Resource
    Electronic Resource
    Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea (2002)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 11 (2002), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  The manned submersible Shinkai 2000 investigated yellow patches on the near-summit slope of Shiribeshi Seamount in the Japan Sea. Yellowish patches are often associated with seepage, and the possibility of seepage at Shiribeshi Seamount was tested by the following four lines of observation: (i) high subsurface temperature was measured at a ring-like patch, although no increase in subsurface temperature was observed at other patches; (ii) high gamma ray (γ-ray) intensity from the thorium series was recorded in the patch zone; (iii) the yellowish deposit was composed of calcite, quartz and amorphous iron compound, as seen at the yellowish patches in other seeps and volcanoes; (iv) lipid phosphate, a measure of microbial abundance, in sediments of the ring-like patch was determined, and the recorded microbial abundance was higher inside the patch than outside it. The four lines of observation are explained consistently by postulating that the seepage of warm fluid contained Fe and γ-ray sources. A hydrothermal origin of the yellow patches is not ruled out for the extinct but young (0.9 Ma) arc volcano.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1738.2002.00370.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fossil worm tubes from the presumed cold-seep carbonates of the Miocene Hayama Group, Central Miura Peninsula, Japan (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @island arc 4 (1995), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract Fossil worm tubes were collected from the Hayama Group, Miura Peninsula, Japan, together with abundant fossils of Calyptogena-Acharax clams. The fossil worm tubes were well preserved and coated with milky white amorphous silica. Most of the tubes were 1-3 mm in diameter, and up to 10 cm in length. Worm tubes were found in siltstone and limestone, and formed network-like assemblages. Elemental mapping on the tube cross-sections revealed the localization of sulfur, zinc and iron at the worm tubes, which suggests that sulfur-related metabolism and deposition occurred in association with the worm tubes. High resolution analysis revealed the localization of zinc-sulfur (sphalerite, ZnS) on the tubes, while iron-sulfur (pyrite, FeS2) was localized at the center of the tubes. The spatially separate sphaleritization and pyritization imply that epiphytic and endosymbiotic microorganisms perform different sulfur metabolisms, such as sulfate-reduction and sulfide-oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.1995.tb00143.x
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  • 3
    Electronic Resource
    Electronic Resource
    Sea-floor fissures, biological communities and sediment fatty acids of the Northern Okushiri Ridge, Japan Sea: Implications for possible methane seepage (1999)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 8 (1999), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A biological community was discovered in the Northern Okushiri Ridge, northeastern Japan Sea. The community was closely associated with sea-floor fissures, and presumed to be supported by methanotrophic and/or thiotrophic bacterial production. Sediments inside of and in the vicinity of the fissures were collected, and the short-chain (C9–20) sediment fatty acids were analyzed for amounts and compositions. The fatty acid compositions were compared with those from a known methane seep and a submarine volcano in the Sagami Bay, central Japan, and from a whale skeleton at the Torishima Seamount, northwestern Pacific Ocean. As a result, a close relationship between the sediments from the Northern Okushiri Ridge, the known methane-seep, and the whale skeleton was found. This finding represents the first discovery of methane seepage and associated biological communities in the Japan Sea. This also supports the hypothesis that the eastern margin of the northern Japan Sea is at the early stage of new subduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1738.1999.00234.x
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  • 4
    Electronic Resource
    Electronic Resource
    Active spreading and hydrothermalism in North Fiji Basin (SW Pacific). Results of Japanese French Cruise Kaiyo 87 (1990)
    Springer
    Marine geophysical researches 12 (1990), S. 269-283 
    Details
    ISSN: 1573-0581
    Keywords: SW Pacific ; North Fiji Basin ; sea floor spreading ; hydrothermalism ; Seabeam mapping ; magnetism ; dredging ; water sampling ; deep towing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The aim of the Japanese-French Kaiyo 87 cruise was the study of the spreading axis in the North Fiji Basin (SW Pacific). A Seabeam and geophysical survey allowed us to define the detailed structure of the active NS spreading axis between 16° and 22° S and its relationships with the left lateral motion of the North Fiji Fracture Zone. Between 21° S and 18°10′ S, the spreading axis trends NS. From 18°10 S to 16°40 S the orientation of the spreading axis changes from NS to 015°. North of 16°40′ S the spreading axis trends 160°. These two 015° and 160° branches converge with the left lateral North Fiji fracture zone around 16°40′ S to define an RRFZ triple junction. Water sampling, dredging and photo TV deep towing give new information concerning the hydrothermal activity along the spreading axis. The discovery of hydrothermal deposits associated with living communities confirms this activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02428198
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  • 5
    Electronic Resource
    Electronic Resource
    Vertical distribution of bacterial abundance in the northwest pacific ocean (1990)
    Springer
    Journal of oceanography 46 (1990), S. 107-110 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Mixed populations of free-living marine bacteria were collected at depths from the surface to the bottom (1,960m in Suruga Bay and 1,585 m in the Japan Sea) in the northwest Pacific during deep-sea diving by the submersible,Shinkai 2000. Their abundance in total cell counts and in lipopolysaccharide (LPS) concentration was found to decrease with increasing depth, and the decreasing profiles were shown to be linear on logarithmic scales. The total cell counts and the LPS concentration showed a linear relationship on arithmetic scales, and the LPS content per cell was found to be 1.02×10−14 g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02123436
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  • 6
    Electronic Resource
    Electronic Resource
    Sulfur bacteria originating from the water and organisms in a hydrothermally active area of the mid-okinawa trough (1990)
    Springer
    Journal of oceanography 46 (1990), S. 111-117 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrothermal venting and associated fauna were observed in the mid-Okinawa Trough during deep-sea diving byShinkai 2000. Water and organisms were collected there for on-board cultivation of sulfur bacteria. Sulfur bacteria capable of growing on an inorganic medium containing thiosulfate were subcultured and isolated. The isolated chemoautotrophic sulfur bacteria were all rod- to beanshaped, nonsporing, and gram-negative. They could also grow on an organic medium and thus were shown to be facultative chemoautotrophs. Their facultative chemoautotrophy would result in synergetic metabolism of both inorganic and organic substrates; thus the sulfur bacteria could be highly adaptive to nutritional diversity of hydrothermal vent areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02123437
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  • 7
    Electronic Resource
    Electronic Resource
    Abundance and productivity of bacterioplankton in a eutrophication gradient of Shimoda Bay (1993)
    Springer
    Journal of oceanography 49 (1993), S. 657-665 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Abundance, specific growth rate, and productivity of bacterioplankton were investigated over a year in Shimoda Bay, Japan, with reference to the eutrophication parameters such as dissolved organic carbon (DOC) concentration. The results from six stations in the bay indicated the formation of a eutrophic gradient ranging from eutrophic (at a river mouth) to mesotrophic (at the bay mouth) levels. Both DOC concentration and UV absorbance were found to have good correlations to bacterioplankton abundance and productivity within the eutrophication range of Shimoda Bay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276750
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  • 8
    Electronic Resource
    Electronic Resource
    Biological community and sediment fatty acids associated with the deep-sea whale skeleton at the Torishima Seamount (1996)
    Springer
    Journal of oceanography 52 (1996), S. 1-15 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A whale skeleton was discovered on the flat-topped summit of the Torishima Seamount, 4037 m deep, northwest Pacific Ocean, during a dive by the submersibleShinkai 6500 in 1992. The skeleton was encrusted with mytilid mussels and harbored benthic animals such as galatheid crabs, echinoderms, sea anemones, and unidentifiable tube worms. The whale skeleton was revisited in 1993. Sediment samples were collected to outline the chemical-microbial distribution in the sediment associated with the skeleton. In the sediment, there was a gradient of sulfide concentration with the peak of 20 n moles per gram sediment just beneath a bone. Corresponding gradients were observed in thiosulfate-oxidizing enzyme activity, bacterial colony counts and fatty acid amounts. Direct analysis of the sediment fatty acid composition suggested the occurrence of methane-oxidizing bacteria and sulfur-reducing bacteria in close association with the whale skeleton. These observations imply that the methane and sulfides were formed during the saprogenic process and utilized for the chemosynthetic bacterial production to feed the whale skeleton-animal community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02236529
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  • 9
    Electronic Resource
    Electronic Resource
    Differential enumeration of intact and damaged marine planktonic bacteria based on cell membrane integrity (1996)
    Springer
    Journal of aquatic ecosystem stress and recovery 5 (1996), S. 217-222 
    Details
    ISSN: 1573-5141
    Keywords: bacterioplankton ; viability ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract “Viable but non-culturable” (VBNC) bacteria are a much discussed issue in microbial ecology. Quantitative aspects are not understood, due mostly to the lack of suitable techniques. A widely accepted approach is dependent on the integrity of cell membranes. Recently developed fluorescence dyes differ in permeability with respect to the integrity of membranes: one dye permeates the intact membranes, which another permeates those which are damaged. Although the dyes were developed originally for determining the viability of cultured bacteria, here they are used to enumerate live and dead bacterial cells (designated as having intact and damaged membranes, respectively) in natural environments. Preliminary results from coastal waters of Seto Inland Sea, Japan, were: 1) the sums of the intact and damaged cells were very similar in each case to the total number of acridine orange-stained cells; and 2) about 50–60% of the total bacteriaoplankton populations are intact with respect to membrane integrity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662182
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of rapid oligotrophication by an aquatic treatment pilot plant on the microbial community of a mesotrophic Bog (1988)
    Springer
    Water, air & soil pollution 42 (1988), S. 421-432 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Rapid oligotrophication by the operation of the ‘Bio-filter system’ has changed Doh-Hoh-Numa Bog from a moderate mesotrophic system to the oligotrophic end of such a system. However, the population growth rate of the bacterioplankton community was little affected, and continued to be controlled primarily by the DOC concentration even after the system operation. This DOC concentration was higher during the operation period, although environmental factors relevant to primary production were shifted to the direction of oligotrophication. The natural bacterioplankton community in the bog was shown to modify its physiological kinetics to maintain the growth rate at the optimal level, even when it was exposed to oligotrophication processes with the operation of the ‘Bio-filter system’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279285
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