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Volume 25, Issue 1
Displaying 1-4 of 4 articles from this issue
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Syoji CHIBA1964 Volume 25 Issue 1 Pages 1-8
Published: March 30, 1964
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSOno dammed lake was constructed in the River Yura at the narrows in Miyama-cho, Kyoto Prefecture. It was filled with water in June, 1961.
The writer collected the plankton in the surface layer of this lake ten times in 1962, at eight of which the observations of the vertical distribution of water quality were also made. The results obtained are as follows. In summer there are the distinct vertical distribution of water temperature, the pH values and the amounts of dissolved oxygen, but no distinct epilimnion developed.
As to Rotatoria, two groups were observed, the one abundantly before July and the other after September. Synchaeta pectinata EHRBG. is particular, making up 96.5% of all the plankton on January 6. Cyclops sp. was found throughout the year, while Bosmina longirostris (O.F. MÜLLER) appeared in January and entirely disappeared in March. Bosminopsis deitersi RICIARD was observed from March to November. In September and October both species were still seen.
In the phytoplankton, Dinobryon vigorously increased in May, June and September. Cyanophyceae occurred after July, and Bacillariophyceae comparatively in large quantities before June. As to Chlorophyceae, one group was observed before July and the other after August.
The occurrence of Oscillatoria tenuis C. A. Agardh, Synedra ulna (NITZSCH) EHR., Eudorina elegans EHRENBERG and Volvox aureus EHRENBERG suggests that the water of this lake may be rich in dissolved nutritive substances, compared with other artificial lakes, due to the influences of the surrounding fertile areas.View full abstractDownload PDF (348K) -
Takaaki YAMAGISHI1964 Volume 25 Issue 1 Pages 9-12_1
Published: March 30, 1964
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSMt. Naeba (2, 145 meters above sea level) is situated at the boundaries of two prefectures, Niigata and Nagano, and there are many Sphagnum bogs at its southern slope lying at an elevation of about 2, 000 meters.
In this paper are reported 51 species of algae belonging to the Chlorophyceae and Flagellata collected from these bogs. Among these species, Dicranochaete reniformis, Kentrosphaera facciolae, Oocystis crassa, Scenedesmus serratus, Peroniella hyalothecae are newly recorded from Japan.View full abstractDownload PDF (1195K) -
Teizi KAWAI1964 Volume 25 Issue 1 Pages 15-22
Published: March 30, 1964
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESS1. The Tokoro River running over 51 km, near Abashiri in Hokkaido, was investigated in August 1961 at seven stations in regard to the influence of industrial pollution upon the bottom fauna.
2. The main elements in the composition of the bottom fauna in question are insect larvae and nymphs which are composed of mainly those of caddis flies, mayflies and midges.
3. The standing crop of bottom animals of each station examined was shown Tables 2 and 3. Its highest value was found at the station 1, Kunneppu, being amounted 4, 293mg per 50cm x 50cm of the river bottom. The lowest value, 39.3mg was found at the station 4, Wakamatsubashi, where the palp mill waste flows into the river.
4. The biotic indices according to BEcK's (1955) method modified by TSUDA (1960) are shown in Fig. 2 and Tab. 4.View full abstractDownload PDF (282K) -
Noboru NISHIMURA, Masahiro AKITA, Keiko HARIMOTO, Michiko HIROSE, Taka ...1964 Volume 25 Issue 1 Pages 23-35
Published: March 30, 1964
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSSimultaneous observations of the water temperatures were carried out in the Maruyama River, Hyogo Prefecture from January to December 1963. The results obtained can be summarized as follows:
1.The difference of water temperatures between the upper and the lower parts is small (4.1°C)in winter and large (7.PC) in summer.
2.Regarding the feature of the distribution of water temperatures in summer, four divisions can be distinguished in the course of the river, that is: 10°C>(source), 10-20°C(head stream), 20°C %ge; (torrential part), and 20°C< (middle and lower parts).
3.The seasonal change of water temperatures is the smallest in January and the largest in August.
4.The diurnal change of water temperatures shows the minimum at 4-6 a. m. and the maximum at 2-4 p.m.
5.Water temperature is higher than air temperature from January to February in the upper part, but in the lower part this phenomenon appears from October to February.View full abstractDownload PDF (357K)
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