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  • 1
    Series available for loan
    Series available for loan
    Biogeochemical data of the 52nd Japanese Antarctic Research Expedition in austral summer of 2010 - 2011 (2012)
    Tokyo : Inst.
    Associated volumes
    Details Availability
    Call number: ZSP-403-321
    In: Jare Data Reports
    Description / Table of Contents: This report presents biogeochemical data obtained by the 52nd Japanese Antarctic Research Expedition in the austral summer of 2010 - 2011. The data include measurements of the temperature, salinity and inorganic nutrient concentrations of seawater shallower than 500 m in the Southern Ocean.
    Type of Medium: Series available for loan
    Pages: 14 S. : graph. Darst.
    Series Statement: Jare Data Reports 321 : Marine Biology 43
    URL: http://id.nii.ac.jp/1291/00003376/
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Report on the surface phytoplankton pigments measured during the JARE-33 cruise to Syowa Station, Antarctica, November 1991 to March 1992 (1996)
    Tokyo : Inst.
    Associated volumes
    Details Availability
    Call number: ZSP-403-217
    In: Jare Data Reports
    Type of Medium: Series available for loan
    Pages: 101 S. : Ill.
    Series Statement: Jare Data Reports 217 : Marine Biology 25
    URL: http://ci.nii.ac.jp/vol_issue/nels/AA10457755/ISS0000028870_en.html
    Branch Library: AWI Library
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  • 3
    Electronic Resource
    Electronic Resource
    Seasonal changes in size-fractionated primary production and nutrient concentrations in the temperate neritic water of Funka Bay, Japan (1988)
    Springer
    Journal of oceanography 44 (1988), S. 268-279 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Size-fractionated primary productivity and chlorophylla concentration were studied at two stations in the temperate neritic water of Funka Bay, Japan, from April 1984 to May 1985. Size distributions of phytoplankton were discussed in relation to nutrient availability. In the central part of the bay, 66% of the annual primary production occurred during the spring phytoplankton bloom with 95% of the spring production being accounted for by the greater than 10µm size fraction, which was dominated by diatoms. The increase in this large fraction was enhanced at both stations when nutrient concentrations increased in the bay's upper layer. Under low nutrient concentrations during summer, small phytoplankters (〈2µm) accounted for 40 to 75% (average 60%) of the total14C uptake at the central station, and from 25 to 59% (average, 45%) at the coastal station. However, a sudden nutrient enrichment at the coastal station during the summer triggered the growth of the large size fraction. These seasonal and regional changes in total14C uptake were attributed to the large size fraction, composed mainly of diatoms. From the decreases in various nutrients during diatom blooms, it was further suggested that the predominance of diatoms was determined, not only by nutrient concentrations, but also by their relative availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02302569
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  • 4
    Electronic Resource
    Electronic Resource
    Abundance and size composition of the summer phytoplankton communities in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska (1996)
    Springer
    Journal of oceanography 52 (1996), S. 335-351 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chlorophylla concentrations (Chla) of size-fractionated phytoplankton samples were measured in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska during the summer of 1986. Among samples collected in the upper 100 m (total of 210 samples), 207 samples were dominated by micro- (〉10 μm) or picoplankton (〈2 μm) and only three samples were represented by nanoplankton (2–10 μm). These 207 samples were classified based on the total Chla content into three types: Type H (〉1.0 μg l−1), Type M (0.5–1.0 μg l−1), and Type L (〈0.5 μg l−1). These types further divided into two subtypes (-p and-m), depending upon dominancy of pico (-p) and microplankton (-m). The phytoplankton community was represented by Type L-p in the Gulf of Alaska, where 80% of the samples fell into this type. It was represented by Type M-p in the western North Pacific and the Oceanic Domain in the Bering Sea, where 53 and 41% of samples were identified as this type, respectively. In the Middle Domain of the Bering Sea, 68% of samples collected below the nitracline was Type H-m, which indicates blooms of microplanton. This type was also observed in the neritic waters near the Aleutian Islands. These types described above are consistent with a general trend that an increase in phytoplankton abundance is attributed to the growth of microplankton. An unusual type occurred above the nitracline of the Middle Domain, where microplankton prevailed, although the total Chla was less (Type L-m). This type represents a feature of late phase of an ice edge bloom. Another unusual type was found mainly in the Outer Domain of the Bering Sea, where the total Chla was high and picoplankton prevailed (Type H-p). The predominance of picoplankton seems to result from the heavy grazing intensity of large calanoid copepods upon microplankton but not upon picoplankton
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02235928
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution of cyanobacteria and other picophytoplankton in the western North Pacific Ocean, Summer 1989 (1990)
    Springer
    Journal of oceanography 46 (1990), S. 184-189 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Cell densities of phycoerythrin-fluorescing cyanobacteria and other chlorophyll-fluorescing picophytoplankton in the 0.2–2.0 µm size fraction were investigated, using an epifluorescence microscope, in the western North Pacific Ocean (36.5–44.0 °N, 155.0°E) in the summer of 1989. Cyanobacteria were most abundant in the surface of the subtropical water (36.5–38.0°N) and less in the northern sea area (39.5–44.0°N). The cell density of other picophytoplankton was, however, high in the northern part and low in the subtropical water. Results showed that algae other than cyanobacteria may significantly contribute to the picophytoplankton community under the low water temperature conditions of open waters. Chlorophylla concentration represented well the abundance of picophytoplankton other than cyanobacteria, but had no significant correlation with the cyanobacteria cell density. Chlorophylla-based data must be interpreted with caution, since the abundances of cyanobacteria were often considerably different even though the chlorophylla concentrations were the same level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125579
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  • 6
    Electronic Resource
    Electronic Resource
    Seasonal fluctuations of cell density of cyanobacteria and other picophytoplankton in Iwanai Bay, Hokkaido, Japan (1992)
    Springer
    Journal of oceanography 48 (1992), S. 257-266 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In Iwanai Bay, which is located on the Japan Sea coast in Hokkaido, seasonal fluctuations in cell densities of phycoerythrin-dominant cyanobacteria and chlorophyll-dominant, other picophytoplankton were examined. Cell densities of cyanobacteria and other picophytoplankton ranged from 1.4×105 to 1.9×108 and from 4.0×104 to 4.3×106 cells 1−1, respectively. The cell densities of both groups tended to increase after spring diatom bloom with remarkable fluctuations from June to August. This tendency was caused by the vertical distributions of both groups. The maximum density layer shifted from 0–20 m depth in April–June to 20–50 m depth in August–October. Cyanobacteria were dominant in picophytoplankton community which accounted for 73–99% of the total cell density during the whole year. Present results show that the picophytoplankton community in Iwanai Bay was influenced by a single water mass system (Tsushima Warm Current) during the whole year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02233986
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  • 7
    Electronic Resource
    Electronic Resource
    Distribution of phytoplankton in the East China Sea in the winter of 1993 (1996)
    Springer
    Journal of oceanography 52 (1996), S. 323-333 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Phytoplankton distribution and its relationship to water masses were investigated in the East China Sea from February 15 to March 10, 1993. Diatoms, dinoflagellates and coccolithophorids were examined by the Utermöhl method. Two distinct phytoplankton assemblages were identified: a shelf and oceanic assemblage. The shelf community was characterized by a high abundance of diatoms, particularly, a benthic diatomParalia sulcata, and the oceanic community by numerical dominance of coccolithophorids and occurrence of surface warm-water species of diatoms. A boundary of both communities was located at the shelf edge that coincided with the shelf side of a Kuroshio front.P. sulcata was the most dominant in the inner shelf area throughout the water column. The occurrence of this species near the surface was considered to be a good indicator of the enhanced vertical mixing driven by winter monsoon. The species survives under extremely low light intensity near the bottom during the stratified periods in summer. During the winter time when light condition at the bottom becomes most unfavorable, resuspension and upward traveling of the species due to enhanced vertical mixing seem to be advantageous to acquire suitable light condition. Because of its predominance, possible importance ofP. sulcata is suggested in material cycling on the shelf, particularly near the bottom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02235927
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  • 8
    Electronic Resource
    Electronic Resource
    Seasonal changes in the biomass of zooplankton and their food requirement in Funka Bay (1988)
    Springer
    Journal of oceanography 44 (1988), S. 228-234 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Zooplankton biomass consisting of large and small-size copepods, copepod nauplii and tintinnids were investigated over a period of one year at two stations in Funka Bay, Japan. The food requirement of zooplankton was also estimated using the method of Ikeda and Motoda. Estimated total carbon requirement of zooplankton in the coastal and central parts of the bay was equivalent to 52 and 38% of the annual primary production, respectively. These corresponded to zooplankton production of 12–13 gC·m−2·yr−1. The total carbon requirement at each station increased to 63 and 74% of the primary production during summer compared with 26 and 3% in spring or 19 and 17% in winter. The microzooplankton (copepod nauplii and tintinnids) accounted for about half of the carbon requirement from April to November. Food requirements reached 161% at the coastal station and 194% at the central station of the daily organic carbon production during September. Zooplankton may also feed on carbon sources other than living phytoplankton. This could account for the observed decrease in particulate organic carbon in a water column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02303426
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  • 9
    Electronic Resource
    Electronic Resource
    Spatial Patterns in Nutrient and In Vivo Fluorescence Distributions in the Marginal Ice Zone and the Seasonally Open Oceanic Zone in the Indian Sector of the Antarctic Ocean, in Austral Summer (2000)
    Springer
    Journal of oceanography 56 (2000), S. 185-196 
    Details
    ISSN: 1573-868X
    Keywords: Marginal ice zone ; seasonally open oceanic zone ; Indian sector ; the Antarctic Ocean ; silicate ; nitrate + nitrite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Surface temperature, salinity, concentrations of silicate (Si) and nitrate + nitrite (N), and in vivo fluorescence (Fluor) were investigated in the marginal ice zone (MIZ) and the seasonally open oceanic zone (SOOZ) (32–40°E, 64–69°S) from February 23 to 28 1992. In the MIZ the mean Si and N were 67.8 ± 2.2 μM and 32.5 ± 1.7 μM, respectively. There was a trend that low N values coincided with high Fluor values. Observation conducted at one point (64°S, 38°E) revealed a diel variation pattern in Fluor. Applying this pattern of deviation from noon value, all Fluor data were normalized to value at local noon. In the MIZ a significant negative correlation was observed between the normalized Fluor and N but not Si. On the other hand, Si decreased continuously from south to north in the SOOZ and was negatively correlated with the normalized Fluor. Difference in Si concentration was about 30 μM between the sea around 64°S and the MIZ, while the difference in N concentration was estimated as less than 10 μM. If diatoms take up silicate and nitrogen at an approximate ratio of 1:1, additional nitrogenous nutrients other than nitrate and nitrite (e.g. ammonia, urea etc.) would be required. In this case, an f-ratio of lower than 33% is obtained. It is suggested that in the MIZ abundance of phytoplankton community dominated by non-diatom increases utilizing nitrate while in the SOOZ abundance of phytoplankton community dominated by diatoms increases consuming Si and regenerated nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011187229918
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  • 10
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    Abundance and size composition of the summer phytoplankton communities in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska (1996)
    Springer
    Details
    Publication Date: 1996-05-01
    Print ISSN: 0916-8370
    Electronic ISSN: 1573-868X
    Topics: Geosciences , Physics
    Published by Springer
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