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Volume 16, Issue 1
Displaying 1-5 of 5 articles from this issue
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Eiichi MINAMI, Noboru YAMAGATA, Makoto SHIMA, Yatsuka SAIJÔ1952 Volume 16 Issue 1 Pages 1-5
Published: April 01, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe crater lake “Yugama” of Volcano Kusatsu-Shirane, Gumma Prefecture was studied preliminary from the limnological standpoint. It is 260m in length and has an area of 37, 000m2, the maximum depth being 17.7m. One of the extraordinary properties of the lake water is its remarkable acidity, the pH being calculated as low as 0.8. The water (volume calculated as ca. 500, 000m3) contains about 2, 000 tons of sulphuric acid and 2, 500 tons of hydrochloric acid. One litre of water contains 320mg of ferrous ion and 255mg of calcium ion. The surface temperature of water was recorded as high as 28.8°-29.°C (atmospheric 12.3°C) in October and 20.2°C (atmospheric -7.0°C) in December.View full abstractDownload PDF (621K) -
Tadashi TAMURA1952 Volume 16 Issue 1 Pages 6-14
Published: April 01, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSLimnological and planktological observations were made on Jusangata, a brackish water lake of an area of 20.9km2, in Aomori Prefecture, in January of 1949. The temperature of water was higher (5.6°C) at the stations near the outlet and became low (0.5°C) in the innermost part where there was covered with ice 8-10°cm thick. The pH-value was 8.25 at the stations where chlorine content was more than 10‰. The lake is oligohaline in winter, while in summer months it is polyhaline in its entire area. The plankters occurred in this season are as many as 90 species, of which 55 are phytoplankters and the remaining 35 zooplankters. Of the phytoplankters, the diatoms are the most abundant. The brackish water species of Copepoda such as Limnocalanus sinensis and Pseudodiaptomus inopinus were found in the area different from their range in summer.View full abstractDownload PDF (1015K) -
Minoru HIRANO1952 Volume 16 Issue 1 Pages 15-23
Published: April 01, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe present contribution is an analysis of the desmid-flora in the Ozé district, Central Japan. Some systematic accounts have already been made by the present writer (Hirano, 1942, 1943, 1948). Of the 136 species recorded from the Ozégahara moor of the district, 40 common members (Table I) are those which are widely distributed in Sphagnum-moors of other mountainous regions. The other 96 are, on the contrary, those which are found either in the marginal regions of Lakes Ozé-numa and Jiuèmon-ike in the district or in swamps of other districts. The former members are marked with two asterisks (**) in Table IV that contains all the members occurred in Lake Ozé-numa. This is a volcanic dammed lake, the common species found there being given in Table IV in marking with an asterisk. In a small lake Jiuémon-ike west of Ozé-numa, there are found 51 species of desmids, 25 of which occur also in the marginal regions of Ozé-numa, as shown in Table IV in marking with three asterisks (***). These facts seem to show the complexity in succession of the desmid-flora from Lake to moor.View full abstractDownload PDF (1043K) -
Kokichi YAMAMOTO1952 Volume 16 Issue 1 Pages 24-30
Published: April 01, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSFive species of rotifers belonging to the genus Keratella are described and figured. Keratella cochlearis, K. quadrata and K. valga are very noticeable in their variations of hind spines and reticulated pattern on lorica. The state of distributions of K. quadrata and K. valga are interesting. K. cruciformis is the species of brackish waters and K. serrulata is of dystrophic waters.View full abstractDownload PDF (832K) -
1952 Volume 16 Issue 1 Pages 31-38
Published: April 01, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (1353K)
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