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  • 1
    Electronic Resource
    Electronic Resource
    Study on the distribution and ecology of marine plankton (1980)
    Springer
    Journal of oceanography 36 (1980), S. 126-133 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Over the past 30 years, I have carried out research on the distribution and ecology of marine plankton using research vessels of the Japan Meteorological Agency and the Ocean Research Institute mainly in the Kuroshio and Oyashio areas as well as in Sagami Bay. In this report, some results obtained on the ecological features of blue-green algae, diatoms, chaetognaths etc. in relation to water masses and currents are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02312098
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  • 2
    Electronic Resource
    Electronic Resource
    Life history ofEuphausia similis (crustacea, euphausiacea) in Sagami Bay, central Japan (1990)
    Springer
    Journal of oceanography 46 (1990), S. 237-249 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The life history ofEuphausia similis G.O. Sars in Sagami Bay, central Japan, has been studied by examining the abundance, size distribution, and occurrence of each growing stage from egg to adult. Three cohorts were laid within the period from July 1979 to July 1980. Individuals of cohort I of 1980 were laid in November and December 1979, and matured and spawned in March and April of the following year. Those of cohort II of 1980 laid in January and February 1980 should mature in November and spawn after December, by analogy with cohort II of 1979. Cohort III of 1980 was laid in April 1980, but decreased in number in July. Cohort II was the dominant cohort in Sagami Bay throughout the period studied. From December 1979 to April 1980 when the mixing layer was present, many eggs ofE. similis were in the epipelagic zone. It is suggested that the spawning season ofE. similis roughly coincided with the season of active feeding, indicated by high fullness of stomachs in individuals. The production of juveniles and adults was about 1.33 mg C m−2 day−1, and the production to bio mass (P/B) ratio was estimated to be 4.78 between July 1979 and July 1980.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02123500
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  • 3
    Electronic Resource
    Electronic Resource
    Further studies on the feeding habits ofSagitta nagae alvariño in Suruga Bay, central Japan (1976)
    Springer
    Journal of oceanography 32 (1976), S. 209-218 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The feeding ofSagitta nagae was analyzed in connection with food chains in the pelagic and near-bottom communities of Suruga Bay. The following results are obtained: (1)S. nagae feeds on dominant copepod species both in the free water (upper water layers) and the near-bottom habitats; (2)S. nagae did not show any food-size selection in the range of 0.2 to 1.2 mm in cephalothorax width and height of copepods; (3) Feeding activity ofS. nagae in the free water is highest at night, while in the near-bottom habitat the species feeds more actively during the day than at night; and (4)S. nagae migrates between the bottom and free water and plays an important role in shallow water by connecting the near-bottom community with the pelagic community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107123
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  • 4
    Electronic Resource
    Electronic Resource
    Larval development ofEuphausia similis (Crustacea, Euphausiacea) in Sagami Bay, central Japan (1984)
    Springer
    Journal of oceanography 40 (1984), S. 57-66 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The larvae ofEuphausia similis G. O. Sars in Sagami Bay, Central Japan, are described. Nauplius, metanauplius, calyptopis and furcilia stages are included. In the furcilia stage, six forms are identified on the basis of the form of the pleopods and the number of terminal telson spines. Furcilia I: a pair of non-setose pleopods and seven terminal telson spines. Furcilia II: a pair of setose and three pairs of non-setose pleopods and seven terminal spines. Furcilia III: four pairs of setose and a pair of non-setose pleopods and seven terminal spines. Furcilia IV: five pairs of setose pleopods and five terminal telson spines. Furcilia V: five pairs of setose pleopods and three terminal telson spines. Furcilia VI: five pairs of setose pleopods and one terminal telson spine. On the basis of the developmental pathway of the larvae,E. similis is suggested to be related toE. spinifera, E. longirostris, E. hanseni and theE. gibboides group species. The size ofE. similis larvae, expressed as total length, in Sagami Bay varied according to month. The sizes of calyptopis III and furcilia I–V stages were smallest in November and March and largest in May.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071209
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  • 5
    Electronic Resource
    Electronic Resource
    Obituary Professor Koji Hidaka (1984)
    Springer
    Journal of oceanography 40 (1984), S. 323-326 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02303335
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  • 6
    Electronic Resource
    Electronic Resource
    Pelagic chaetognaths in Sagami Bay and Suruga Bay, Central Japan (1973)
    Springer
    Journal of oceanography 29 (1973), S. 267-275 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Pelagic chaetognaths in Sagami Bay and Suruga Bay, Central Japan, were studied. Their community structure was very similar in both of these bays. Four genera and 26 species were identified. In Sagami Bay the habitat segregation by depths was clearly obtained. The population and species number of epipelagic (0–200 m) chaetognaths were larger in summer than in winter. The populations of meso- (200–500 m) and bathypelagic (500–1,000 m) species were smaller than that of epipelagic ones and fairly stable seasonally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108846
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  • 7
    Electronic Resource
    Electronic Resource
    Trichodesmium in the East China Sea (1974)
    Springer
    Journal of oceanography 30 (1974), S. 298-303 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A study is made on the surface distribution ofTrichodesmium thiebautii Gomont in the East China Sea during the years 1961–1967. 1. This alga is very scarce or absent in the period from January to March, and begins to increase in May and June, reaching the maximum population density from July to September, and again decreases in October and November. 2. In summerT. thiebautii is predominantly distributed in the area along the Kuroshio current with high densities of 102–103 filaments/l, occasionally exceeding 103 filaments/l. This alga is estimated to occupy the major part or almost all the parts of chlorophylla in situ contained in the surface water of this season. 3. The occurrence ofT. thiebautii off the southern coasts of Central Japan seems to be caused rather by the multiplication in its own habitat than by the transportation by the Kuroshio current from the East China Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109673
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  • 8
    Electronic Resource
    Electronic Resource
    Feeding of a pelagic chaetognath,Sagitta nagae Alvariño in Suruga Bay, Central Japan (1972)
    Springer
    Journal of oceanography 28 (1972), S. 181-186 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The feeding ofSagitta nagae, the most predominant chaetognath species in Suruga Bay, was studied. Specimens were collected with ORI-100 net (1.0 mm in mesh aperture) and MTD net (0.35 mm in mesh aperture) and were fixed with neutralized formalin. The main food organisms ofSagitta nagae were the copepods,Candacia bipinnata, Calanus pacificus andPareuchaeta russelli. The food-containing ratio (P/T, %) was higher at night and lower in the daytime. Here, P is the number ofSagitta containing food organisms in the gut and T is the total number ofSagitta examined. P/T was almost constant vertically in the upper 100 m layer. P/T was generally influenced neither by food density nor by the copepod numbers perSagitta in this study.Sagitta nagae took food throughout life. Food ingested bySagitta per day was calculated as 37.6% ofSagitta in dry weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108551
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  • 9
    Electronic Resource
    Electronic Resource
    Oil globules and their attached organisms in the East China Sea and the Kuroshio area (1973)
    Springer
    Journal of oceanography 29 (1973), S. 155-158 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Along 125°E in the East China Sea and the Kuroshio area in May 1971, oil globules were widely distributed in the surface water, mainly in the layer upper than 4 m. The highest value, 11 mg/m3 in wet weight, was obtained at the surface layer of St. 3(28°N). Blue-green algae (Trichodesmium thiebautii andT. erythraeum), pennate diatoms (Nitzschia closterium etc.), stony corals, bryozoans, barnacles (Lepas sp.) and copepods attached to oil globules. Morphological description of two species ofTrichodesmium was given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109091
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  • 10
    Electronic Resource
    Electronic Resource
    Distribution of pelagic blue-green algae in the North Pacific Ocean (1974)
    Springer
    Journal of oceanography 30 (1974), S. 77-85 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The distribution of pelagic blue-green algae, especially ofTrichodesmium thiebautii, was investigated on the basis of the collection of theHakuhō Maru Cruise KH-69-4 along 155°W (50°N-15°S) in the North Pacific Ocean from September to November 1969. (1) Five species were identified:Trichodesmium thiebautii (most predominant),T. erythraeum, Oscillatoria sp.,Katagnymene spiralis andRichelia intracellularis. (2) T. thiebautii was most abundant in the western North Pacific central water and abundant next to it in the equatorial water, but it did not occur in the subarctic water. (3) T. thiebautii was ubiquitously distributed in the lower layer of 100–200 m in the equatorial water, though not in a large quantity. (4) T. thiebautii inhabited only the water warmer than 20°C. In its main habitat, nitrate and nitrite were almost zero, but ammonia and phosphate were present. There was not found any correlation between its occurrence and the salinity. (5) Blue-green algae were generally thinly populated in the water rich in diatoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02112896
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