Recursos de colección

Hokkaido University Collection of Scholarly and Academic Papers (135.711 recursos)

HUSCAP (Hokkaido University Collection of Scholarly and Academic Papers) contains peer-reviewed journal articles, proceedings, educational resources and any kind of scholarly works of Hokkaido University.

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Mostrando recursos 1 - 4 de 4

  1. 腐植物質が有害ラフィド藻Chattonella antiqua の増殖に与える影響

    福﨑, 康司; 内藤, 佳奈子; 吉岡, 崇仁; 澤山, 茂樹; 今井, 一郎
     Humic subsatnces (HS) are major components of dissolved organic matter in aquatic systems and known to have a substantial influence on the trace metal speciation, and thus the bioavailability of trace elements. Trace metals, such as iron, frequently act as a crucial limiting factor for phytoplankton growth, and sometimes bloom developments in the sea. The effects of HS on the growth of the harmful red tide phytoplankton, Chattonella antiqua were investigated by using of a chemically defined artificial medium. Humic acid (0.6, 6, 60 and 600 μg L-1) supplied with iron (541 μg L-1 of ferric chloride hexahydrate) had accelerative effects...
    - 21-oct-2017

  2. Phenology in large grazing copepods in the Oyashio region, western subarctic Pacific

    Yamaguchi, Atsushi; Ohgi, Kohei; Kobari, Toru; Padmavati, Gadi; Ikeda, Tsutomu
     Seasonal sequence of population structure (=copepodid stage composition) of large grazing copepods (Metridia pacifica, Eucalanus bungii and Neocalanus spp.) was analyzed based on seasonal samples collected with 100 μm mesh nets from 0-500 m stratum at Site H in the Oyashio region, western subarctic Pacific, during 1996-1997 and 2002-2007. On the premise that there are little year-to-year differences, the composite data were arranged to the date of samplings of each year to yield seasonal developmental patterns of each copepod. Seasonal developmental pattern estimated by tracing the sequence of mean copepodid stages of the population at each sampling date revealed that...
    - 21-oct-2017

  3. Evaluation of major nutrients regulating the growth of diatoms in Harima-Nada, the Seto Inland Sea, Japan

    Naito, Kanako; Tanabe, Ayako; Itakura, Shigeru; Yamaguchi, Mineo; Imai, Ichiro
     In the eastern Seto Inland Sea, dissolved inorganic nitrogen has decreased due to the reduction of nutrient inputs, and there have been changes in the total cell density and the composition of the phytoplankton assemblages. The major phytoplankton component was diatoms, and the contribution was always over 90 percent of total phytoplankton since the 1990s. In order to elucidate growth characteristics and nutrient consumption of diatom species, we conducted major nutrients-enrichment bottle incubation experiments on shipboard using the surface waters in Harima-Nada, eastern part of the Seto Inland Sea. Seawater incubation experiments demonstrated that nutrient environments for phytoplankton are in a...
    - 21-oct-2017

  4. 北海道南部の北斗市沖から採集された雌雄同体のトラフグTakifugu rubripes

    河合, 俊郎; 松原, 創
     A single specimen of a hermaphroditic tiger puffer, Takifugu rubripes (Temminck and Schlegel, 1850), was collected from the western North Pacific, off Hokuto, Hokkaido, Japan. The left gonad of the specimen was of testicular tissue, and the right gonad was ovarian tissue sandwiched by testicular tissue. This is the first instance of hermaphrodism in this species. In addition, the anterior and posterior nostrils of the specimen were fused to each other, and the left side of the body was abnormally pigmented.
    - 21-oct-2017

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