Japanese Journal of Limnology (Rikusuigaku Zasshi)

Die Odonatenfauna aus dem Quellgebiete von Misima, Zentral Japan

Syoziro ASAHINA

1952Volume 16Issue 2 Pages 39-48
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.39

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On the Vertical Distribution of Density of the Lake Waters (1)

Tosiji TAKEMURA

1952Volume 16Issue 2 Pages 49-54
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.49

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From summer to autumn the circulation of lake water stops for a time and there grow certain layers of varying density within one hundred thousandth at constant temperature except near the bottom. I have investigated for the past two years with respect to the vertical distribution of density on the lakes of Kizaki, Aoki and Nojiri; using a standard hydrometer of sensitivity about 3×10^-6. The following results were obtained.
1) Three types of layers are usually seen according to depth, i. e., surface, intermediate and bottom layers,
2) Intermediate layer seems to be caused by plankton or their dead remains. Both the consumption of potassium permanganate and the viscosity of the water show a good accordance with the density.
3) There are movement and transformations in the intermediate layer.
4) In the bottom layer, the quantitative analysis of iron as well as the measurement of density have been carried out.

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Chemical Constituents of the River Waters on Mt. Zawo, Miyagi Prefecture.

Noboru YAMAGATA

1952Volume 16Issue 2 Pages 55-59
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.55

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Change of the ChemTeal Components of the. Water flowing through the Limonite Deposit.

Makoto SHIMA, Noboru YAMAGATA

1952Volume 16Issue 2 Pages 60-63
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.60

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Atmospheric and water temperatures, pH, Fe and SO₄ of the water were determined at the 37 stations running over the district of limonite deposit near the Kusatsu Hot - spring. The variation of chemical components is understood in considering the presence of two kinds of underground waters, one of which is strongly acid and in very paucity of iron and the other contains it considerableamount of ferrous iron.

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Hydrogen Sulfide and Radon Contents of the Manza Hot Springs

Noboru YAMAGATA, Makoto SHIMA

1952Volume 16Issue 2 Pages 64-67
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.64

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The hydrogen sulfide and radon content in the hot springs of “Mania”, Gumma Pref. were determined. These springs are of high : temperatures in average and contain a small amount of radon, but some of them are extinguished by high hydrogen sulfide content. One litre of the water of the “Okumanza - Figayu” contained 539 mg of hydrogen sulfide.

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Rotifer Fauna of Japanese Inland Waters. (8)

Kokichi YAMAMOTO

1952Volume 16Issue 2 Pages 68-74
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.68

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Seventeen species belonging to the genus Lecane are described. Among them L. candida. L. in fula, L. nodosa, L. papuanaand.L. satyrus are rare species.

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[title in Japanese]

1952Volume 16Issue 2 Pages 75-77
Published: 1952
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.3739/rikusui.16.75

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