Japanese Journal of Limnology (Rikusuigaku Zasshi)

Veränderung des Salzgehaltes in den küstennahen Seen Hokkaidos

Masao MINATO, Yoshio KITAGAWA

1955 Volume 17 Issue 1 Pages 1-3
Published: March 25, 1955
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.17.1

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Es ist eine schon feststehende Tatsache, dass die küstennahen See am ochotskischen Meere, besonders die Wasserbezirke des Abashiri-Sees, vom Beginne des Alviurn sich allmählich versüsst haben. Hier tritt paläographisch etwa während dieser 10, 000 Jahre ein Wechsel ein vom Paphia-Meer (Meerwasser) durch die Ostrea Meerbucht (polyhalin) und durch den Corbicul a-See (mesohalin) zum Anodonta-See (oligohalin).
Im Gegensatz hierzu ist das Wasser des Abashiri-Sees in der Tiefe in neuester Zeit viel, salzhaltiger als früher geworden, wie Tabelle 1 zeigt. Vergleicht man den Salzgehalt von 1950 mit jenem von 1933, so hat sich der Salzgehalt um mehr als das zehnfache verrnehrt. Beinahe dieselbe Erscheinung wurde im Tombetsu-See beobachtet.
Die Ursache der oben erwähnten Tatsachen ist noch unbekannt, aber der Verfasser vermutet, dass in der Nähe des Abashiri-Sees und des Tombetsu-Sees in neuester Zeit eine allrnähliche Senkung stattgefunden hat, sodass das Meerwasser mehr als früher in diese See einfliessen kann. Aus diesem. Grunde ist das Wasser dieser Bezirke salzhaltiger geworden.
Wenn diese Vermutung richtig ist, dann kann man sicherlich die Veränderung des Salzgehaltes der küsten.nahen See nutzbar verwenden, um die wenigen Krustenbewegungen zu erkennen.

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On the Relation between Rainfall and the Change of Illumination in Lake Water

Masahiko MATSUMOTO

1955 Volume 17 Issue 1 Pages 4-9
Published: March 25, 1955
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.17.4

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The under water illumination of lake water is measured with a Matsuda photoelectric tube on Lake Biwa off the City of Otsu. For the convenience of treating the results of measurement, the under water illumination is approximately represented by a function consisting of two exponential functions of depth, each of which has a different absorption coefficient respectively. By this method, it becomes evident that the influence of rainfall appears in the larger absorption coefficient and the smaller absorption coefficient varies with the change of transparency. The behavior of the under water illumination. after the typhoon No. 13 is discussed.

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Les algues de source minérale (source chlorique) de Watarasé de la préfecture de Saitama

Hiroshi EUKUSHIMA

1955 Volume 17 Issue 1 Pages 10-11
Published: March 25, 1955
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.17.10

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J'ai examiné les algues de source minérale de Watarasé au mois du mai1944, et au mois du février 1948. Cette végétation a ébé Navicula cryptocephala association, et j'ai trouvé 1 cyanophycée et 10 diatomées parmi celles, 50 % (en 1944) et 33 % (en 1948) étalent les espêces d'eaux salées.
La source minérale de Watarasé confondait les algues d'eau douce plus nombreuses que celle de Yasbio qui etait l'autre côte et que j'examinai en mème temps à ce jour-ci. Ce n'est pas de la diférence de la densité du chloreion, je pense que cela est des états de ces situations, c'est-à-dir af in que la source minérale de Watarasé jallisse dans le lit de la rivière Jinryu, beaucoup d'algues d'eau y mélangeraient à l'occasion de la crue de la rivière.
Microcystis fuscolutea, Cymbella cistula var. maculata et Navicula cryptocephala var. veneta sont les algues des sources minérales trouvées pour la première fois au Japon.

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Les végétations algologiques de source minérale de Yashio et des torrents de ses environts de la préfecture de Gumma

Hiroshi FUKUSHIMA

1955 Volume 17 Issue 1 Pages 12-17
Published: March 25, 1955
Released on J-STAGE: January 27, 2010

DOIhttps://doi.org/10.3739/rikusui.17.12

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J'ai examine huit endroits des source minérales et des torrents et deux endroits de la riviére de Jinryu, au mois du février 1948. Les végétations des source minérales ont été Navicula cryptocephala-Nitzschia frustulum var. subsalina-Protococcus sp. association (station 4), Microcystis sp.-Navicula cryptocephala var. veneta association (station 7), et celles de l'amonte de torrent ont été Nitzschia linearis association, celles de l'aval ont été Gomphonona parvulum var. microps et celles de la rivière de Jinryu ont été Melosira vazians-Cymbella cistula (contenir var. maculata) association.

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Geochemical Studies in the District of Mt. Norikura (II)

On the Chemical Composition of the Waters of Alpine and Subslpine Lakes

Tetuya TORII, Noboru YAMAGATA, Makoto SHIMA

1955 Volume 17 Issue 1 Pages 18-22
Published: March 25, 1955
Released on J-STAGE: January 27, 2010

DOIhttps://doi.org/10.3739/rikusui.17.18

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The waters of the mountain lakes in the non-vegetated rocky region of Mt. Norikura (about 2, 700-2, 800 m above sea level) have the composition in chemical constituents similar to atmospheric precipitations just like as in the ponds situated on the Ozegahara moor. The evaporation residue is about 10 mg/l in general and the soluble state silicon content is so small-less than 0.3 mg/l generally-that as the weathering effect by precipitations has not yet appeared. But the water of Lake Ohniuike in the forest region at about 2, 400 m above sea level indicates that there is remarkable influence of weathering action. The soluble state silicon content has increased up to 3.9 m/1, and the evaporation residue and the sulphate ion content have become 3-4 times greater ; K/Na. ratio has decreased, while Ca/Mg ratio has increased. It will be known from these values that the nature of the waters approached to that of the water of the River Jintsu at Toyama City. The river system of the slope of Mt. Norikura where there are situated the lakes mentioned in this paper belongs to the Jintsu River.

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A Study of Aquatic Insects and their Producing Capacity in the River System around Volcano Eboshi, Naga-no Prefecture

Yukio HIROSE

1955 Volume 17 Issue 1 Pages 23-32
Published: March 25, 1955
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.17.23

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1. This paper is a result of the survey which has been done in two torrents on Mt. Eboshi, Nagano Prefecture, in the years 1952-53, on the aquatic insect fauna and its productive potentials.
2. The productivity of the River Kakuma is greater than that of the River Kanabara when compared with each other at the same altitude.
3. The difference between two rivers under consideration seems to be caused by the qualitative structure of the rocks which constitute the substrata.
4. The productive potentials measured by dry weights of animals per unit area of the river bottom are graded as 6 : 2 : 2 : 1.5, concerning Trichoptera, Diptera, Tricladida, Ephemeroptera and Plecoptera.

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[title in Japanese]

1955 Volume 17 Issue 1 Pages 33-34
Published: March 25, 1955
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.17.33

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