All issues
Volume 16, Issue 3-4
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
Kokichi YAMAMOTO1952 Volume 16 Issue 3-4 Pages 81-91
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe index-keys to the genera Trichocerca and Diurclla are given, and seven species belonging to the respective genus are described and figured.
Supplementarily, two species and one varieties of Rotifera are described, i, e., Lepadella patella, colurella tesselata and Brachionus angularis var. chelonis,
In addition, Keratella ccchlearis var. javana which was written in the seventh part of the “Rotifer Fauna of Japanese Inland Waters” has been described by Ahlstrorn (1943) as Keratella javana (Hauer) in new combination.View full abstractDownload PDF (1153K) -
1952 Volume 16 Issue 3-4 Pages 91
Published: 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (106K) -
Noboru YAMAGATA1952 Volume 16 Issue 3-4 Pages 92-95
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe ash of a moss Aplozia crenulata var. gracillima, which grows in the running waters influenced by the hot-springs around the Volcanoes Zawo and Kusatsu-Shirané, contains a great amount of iron (89.1% Fe2O3in a sample). The pH of the river waters is 3.03.8 and iron contained in them fluctuates between 0.360mg/l. It remains in question in what forms of such a large amount of iron is present on or in the moss body.View full abstractDownload PDF (459K) -
Kenzô HANEDA1952 Volume 16 Issue 3-4 Pages 96-105
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe geese and ducks living in the five lakes of Nagano Prefecture have been studied during the course of years 19494951 with respect to their habitat selection, the densities of population and feeding habits. From the results of observations, they are classified into three types of assemblages, i. e., the surface feeding, diving and fish eating ducks. Their kinds and population densities seem to be different due to the trophic degrees of lakes in which they live, and may be a good index of the production of those bodies of water.
1. The assemblage of diving ducks inhabits usually the lakes of mseoto eutrophic types.
2. The assemblage of fish eating ducks is found only in eutrophic lake.
3. The assemblage of surface feeding ducks lives in the lakes of all the trophic types. The proportion of its occurrence increases in oligotrophic lake than in eutrophic one, and the lakes of the former type is usually occupied by this assemblage only.View full abstractDownload PDF (1339K) -
Takahisa HANYA1952 Volume 16 Issue 3-4 Pages 106-112
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (577K) -
Ushio TAKEUCHI, Kazuo KAKEGAWA1952 Volume 16 Issue 3-4 Pages 113-119
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (1064K) -
Hirohito SUGIHARA1952 Volume 16 Issue 3-4 Pages 120-129
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe seasonal change of dissolved oxygen was studied in the Misaka river in Maniwa-gun, Okayama Prefecture, during the thirteen months from August 1948 to September 1949. This river flows out from a hill of an altitude of 583.3 meters, running down southwards and joins the Asahi river. The temperatures, the amounts of dissolved oxygen and the hydrogen-ion concentrations of the water were measured at six sampling stations (fig, 1). The amount of dissolved oxygen decreases in the lower course as the water temperature increases (fig. 2). At all the sampling stations the oxygen dissolved in the river water attains a maximum quantity in February and a minimum in July. The pH is usually 7.5 in the upper and 7.0 in the lower course, its seasonal change being rather little.View full abstractDownload PDF (1049K) -
Akira NAKAGAWA1952 Volume 16 Issue 3-4 Pages 130-138
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe food habits of the larvae of four species of Hydropsychidae (Trichoptera) were studied. The results obtained are as follows :
1) The larvae under consideration take both vegetable and animal foods, preferring the former rather than the latter.
2) The foods taken by each species are shown in tables 1-4.
3) They eat almost everything caught in the nest they have made. Of the larvae studied, four species have recently been noticed by the Japanese entomologists as the insects injurious to the water power plant in reducing the rate of flow. They are : Hydropsyche nakaharai Tsuda, H. ulmeri Tsuda, Macronerna radiatum MacLachlan and Hydropsychodes brevilineata Iwata.View full abstractDownload PDF (918K) -
NEGORO Ken'ichiro1952 Volume 16 Issue 3-4 Pages 139a-142
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (597K) -
NEGORO Ken'ichiro1952 Volume 16 Issue 3-4 Pages 139-142
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (172K) -
1952 Volume 16 Issue 3-4 Pages 143-153
Published: June 15, 1952
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (1733K)
- |<
- <
- 1
- >
- >|