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Volume 28, Issue 1
Displaying 1-6 of 6 articles from this issue
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Takeo KATO1967 Volume 28 Issue 1 Pages 1-11
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn the surrounding area of Nabekoshi Pass, many lakes and swamps are distributed here and there. In spite of abundance of lakes, this district has ever been ignored by the limnologists. The author has had cherished desire to explore these lakes from the standpoint of regional limnology. In the snmmer of1965, he had a chance to carry out the survey of Lake Nabekoshi-numa, arepresentative one of these lakes. The results of the investigation are summarized as follows:
(1)The morphometrical data calculated from the bathymetric map(Fig.2) are shown in the next table.
Surface area 5.69×104m2
Length of shore line 1, 650m
Maximum depth 19.20m
Shore development 1.95
Volume 3.66×105m3
From the geomorphological point of view, this lake is considered to be a dammedlake formed by landslide.
(2)In summer stagnation period, this lake exhibits a thermal stratificationcommon to temperate lakes. As for many dissolved materials, the development of stratification is also observed.
(3)The chemical analyses reveal that the surface water shows neutral reaction and the main dissolved substance is sodium chloride derived from the atmospheric salt which is transported by the melt water.
(4)Judging from the low photosynthetic productivity and the poor content of dissolved materials, this lake is deduced to be an oligotrophic lake.View full abstractDownload PDF (439K) -
Tatsuya YAMADA, Masaharu KAWAKATSU1967 Volume 28 Issue 1 Pages 12-19
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn this paper, the vertical distribution of freshwater planarians in the Yûbari district and Mt. Ashibetsu in the Yûbari Mountains in Middle Hokkaidô is reported. The area surveyed is situated at the north-east of the Ishikari lowland area (Lat. 43°00'N. to Lat. 43°20'N. and Long. 141°45'E. to Long. 142°30'E.). Mt. Ashibetsu is situated at the northern corner of the Yubari Mountains and is 1726 metres above sea level. The main river systems of the area surveyed are the Yûbari, the Horomuki and the Sorachi (tributaries of the Ishikari River). Surveys of the majority of the stations were made in August 9-11, 1966.
In the area surveyed, two species of freshwater planarians, Polycelis sapporo (IJIMA et KABURAKI) and Polycelis auriculata IJIMA et KABURAKI, were found. Pol. sapporo was found in the stations within the altitude range from about 150 to 660 metres (inhabitable water temperature range, 6.5-13.9°C). Pot. auriculata was most common in the cold-water stations in the Mt. Ashibetsu district (the Yufure-zawa Valley and the Hanmen-zawa Valley) within the altitude range from about 340 to 780 metres (4.5-10.3°C). The type of the vertical distribution in the area surveyed is shown as S-SA-A (S : Pol. sapporo ; A: Pol. auriculata).View full abstractDownload PDF (3152K) -
Izo INOUE1967 Volume 28 Issue 1 Pages 20-25
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSThe Serikawa river has its origin in the Kawachi cave and its surrounding limestone mountain east of Lake Biwa. Examination of the relation between the hardness and the hydrogen-ion concentration of the water in this district shows that when the river is swollen the pH values become lower and the hardness higher. The hardness of water is usually smaller than 300 p.p.m. at any time and at any station in the course of the river, so that the river water it is not unsuitable for the source of drinking water.View full abstractDownload PDF (128K) -
Yoshihiko KAYAMURA1967 Volume 28 Issue 1 Pages 26-40
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn the Sennan District of the southern part of Osaka Prefecture, there is a lot of freshwater ponds. The author has studied about one hundred ponds there. From seven ponds and one Sphagnum moor at Sunagawa and Kawai areas were collected 93 species of desmids in total, i. e., 8 species of Closterium, 3 species of Pleurotaenium, 4 species of Arthrodesmus, 39 species of Cosmarium, 18 species of Staurastrum, 4 species of Micrasterias, and so on. G-7 was a remarkable pond in which 50 species of desnn'ds were found.
As for the chemical conditions of the waters, the value of pH indicated below 6.0 except J-10 pond and the amounts of KMnO4 cons., Ca and SO4 ions were of low values. Potamogeton, Brassenia, Nitella and Utricularia, which are also commonly found in these ponds, may have some influences on the desmid flora.View full abstractDownload PDF (6629K) -
Syuiti MORI1967 Volume 28 Issue 1 Pages 41-50
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (1372K) -
Matsunae TSUDA1967 Volume 28 Issue 1 Pages 51-55
Published: February 28, 1967
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESS1. This report deals with the result of study on the contents of the alimentary canals of Salvelinus leucomaenis pluvius and Oncorhynchus masou f. mason fished in small branches of the Ina-gawa River System, Fukushima Prefecture in July and August of 1965.
2. As surface baits, that is the baits of air and land origin, Coleoptera including scarabaeids, cerambycids, coccinellids, carabids, chrysomelids, etc. and Hymenoptera including formicids and ichneumonids were found most abundantly in the alimentary canals.
3. As water baits, Trichoptera and Ephemeroptera were found most abundantly.
4. The alimentary canal of Salvelinns sample No. 1 was filled with 8 individuals of diplopods. This fact suggests that the Salvelinus came to the edge of the brook and took the animals living on the wet earth.
5. The alimentary canal of Selvelinus No.3 was filled with 76 larvae of Neophylax sp. (Trichoptera), and that of No.4 with 56 larvae of the same species. Because of the larvae of this caddis-fly often coming together on the stone of the riffle, it seems that the fishes have attacked the group of the larvae.View full abstractDownload PDF (1808K)
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