Japanese Journal of Limnology (Rikusuigaku Zasshi)
Online ISSN : 1882-4897
Print ISSN : 0021-5104
ISSN-L : 0021-5104
Volume 25, Issue 3-4
Displaying 1-4 of 4 articles from this issue
  • 1965 Volume 25 Issue 3-4 Pages 77-93
    Published: March 30, 1965
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
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  • Syuiti MORI
    1965 Volume 25 Issue 3-4 Pages 95-100
    Published: March 30, 1965
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
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  • Takeo KATO
    1965 Volume 25 Issue 3-4 Pages 101-112
    Published: March 30, 1965
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    The Aisawa-gawa River is one of the most important tributaries in the lower reaches of the Mogami River. This drainage system starts from the Dewa Hills and is joined by the Mogami River at the eastern margin of the Shonai Plain.
    Studies are made of the geochemical relationships of the surface water in the Aisawa-gawa basin during the period 1958-59. The discharge-ion relationships that exist in streams through various stages of flow are especially presented in this paper.
    Mineralization in the Aisawa-gawa River near Aisawa fluctatues from 200ppm in a low water stage to 63ppm at a flood stage. Regarding the quality of water, calcium ion and bicarbonate ion are the most prominent constituents. The concentrations of the two ions are related linearly to the logarithm of the stream flow as shown by Figs. 5 and 6. Surface water of the Aisawa-gawa River and its tributaries carries chloride ion in rather high concentration which is derived from atmospheric salt distributed over the drainage basin.
    Moreover, equations were developed by the statistical treatment to correlate between the logarithm of flow and several mineral constituents in solution.
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  • Kyuemon GOSE
    1965 Volume 25 Issue 3-4 Pages 113-122_1
    Published: March 30, 1965
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    The aquatic insect communities in the Niu River, Nara Prefecture, were investigated concerning the conditions before and after a dam was constructed at Kurobuchi in the course of that river. The results obtained are as follows:
    1. In May 1954, before the construction of the Kurobuchi dam, there were found rich insect communities in the river. For example, the standing crops of all the stations (Jodo, Kurobuchi, Wada, Obusu) were estimated 4.5-7.7g in wet samples per 0.25m2. The net-spinning caddis worms were dominant, and the communities were in climax in succession of the aquatic insect communities of rapids.
    2. In May 1960, after the construction of the dam, the lake formed behind the dam has become to have bottom deposits, such as: 1) gravel and sand in the upper part, 2) sand with mud in the middle part, and 3) mud in the lower part. The dominant species found in this investigation are as follows:
    1. Ecdyonurus yoshidae 2. Potamanthus kamonis 3. Limnodrilus sp. The dominant life forms are: a creeping form (1 & 2) and a burrowing form (3).
    3. The lower reaches of the river from the Kurobuchi dam has a very poor fauna, consisting of creeping forms as dominant life forms.
    4. At Wada, on the 2. 5 km lower from the dam, the dominant life forms are swimming and creeping ones.
    5. A rich insect fauna was found at Obusu, 4 km lower from Wada, where the dominant life forms were net-spinners.
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