All issues
Volume 17, Issue 2
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Shigeru MIKI1955 Volume 17 Issue 2 Pages 39-43
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESS“Sokonashi-ike” on Nakano-shima, one of the Tokara Islands, Kagoshima Prefecture, is a small lake dammed by lava from active volcano O-take and not a crater in its origin. The water plants collected in this lake in June of 1953 are 12 species, 3 of which are all the same to those from Hondo, viz. Trapa japonica FLEROW, Sparganium japonicum ROTH and Polygonum nippon ense MAK. There occur no peculiar species related to those of the Liukiu Islands and Formosa.
Trapa of this lake somewhat differs in the shape of its fruit from that of the same species from any of the remote ialands. The body of water which has Trapa and is nearest to Sokonashi-ike is Homan-ike, a pond on the Island of Tanega-shima, some 150 km north-east of Nakano-shima. Trapa of this pond is, however, different from that of Sokonahi-ike in less thick basal part of its fruit. This may suggest that the dispersal of Trapa to Sokonashi-ike from any northern area of its distribution had not taken place by way of Honan-ike and had arrived to the former lake until the latter pond had been born. The water of the latter pond is deeper and clearer than the former lake.View full abstractDownload PDF (1118K) -
Hisanao YAMAGUTI1955 Volume 17 Issue 2 Pages 44-48
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSIn this paper are reported the plankton algae collected in Sokonashi-ike on Nakano-shima, one of the Tokara Islands in June, 1953. The plankton algae excluding diatoms in this season are represented chiefly by a green alga Oedogonium sp. not only in the surface but also in the bottom layers. It is noted that the occurrence of two austral species of blue-green algae, namely Oscillatoria princeps VAUCHER and O. Iwanoffiana (NYG.) GEITLER, of which the former characterizes in its large size the plankton in this season. Four species epiphytic to other algae are also recorded for the first time in Japan.View full abstractDownload PDF (397K) -
Kenichiro NEGORO1955 Volume 17 Issue 2 Pages 49-52
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe author has undertaken the study of diatoms in the plankton materials which were collected by Dr. T. TOKIOKA and Mr. S. UENO in “Sokonashi-ike”, a marshy lake on the Island of Nakano-shima during the Tokara Expedition in the early summer of 1953. Having examined the material, the author has found 31 species of diatoms, of which 5 belong to tropical forms, 1 to a form common in brackish water and the remainings to freshwater forms of cosmopolitan distribution. It is noticeable from biogeographical viewpoint that the diatom flora of this body of water is characterized by the occurrence of two tropical forms, namely Melosira nyassensis and Eunotia formica var. sumatrana. They occurred as either dominant (the former) or subdominant (the latter) in the plankton association of this water in this season (June 6th).View full abstractDownload PDF (533K) -
Kokichi YAMAMOTO1955 Volume 17 Issue 2 Pages 53-54
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSIn the plankton samples taken in “Sokonashi-ike” on Nakano-shima, there occurred two species of Rotatoria and three species of Rhizopod Protozoa. They are listed in the present paper.View full abstractDownload PDF (139K) -
Takashi ITO1955 Volume 17 Issue 2 Pages 55-64
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSIn the present paper, four species of freshwater Copepoda are recorded from two bodies of water in the Islands of Tokara. In “Sokonashi-ike” on Nakano-shima, one of the Islands, there were found two species of Cyclo-poida, Macrocyclops albidus (JURINE) and Mesocyclops leuckarti (CLAUS) and a calanoid Acanthodiaptomus pacificus (BURCKHARDT). In O-ike on Takara-shima, the other one of the Islands, there occurs only a single species of Cyclopoida, Paracyclops fimbriatus (FISCHER).View full abstractDownload PDF (961K) -
Masuzo UENO1955 Volume 17 Issue 2 Pages 65-73
Published: June 15, 1955
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSDuring the Scientific Tokara Expedition in May-June of 1953 conducted by the Osaka Municipal Museum of Natural History, plankton samples were collected by the members of the party in Sokonashi-ike, a small marshy lake on Nakano-shima. This is the only natural body of standing water in the Tokara Islands, to which the Island of Nakano-shima belong. This group of Islands extend over the south-western sea of Kyushu forming the most northeastern part of the Loochoo (Liukiu) Islands, and is an area that is under discussion from biogeographical viewpoint as a boundary between the Palaearctic and Oriental Realms.
In the plankton samples collected in this lake are enumerated 5 species of cladocerans, of which 4 are of cosmopolitan distribution and the remaining one, Alona karua, is a species distributed mainly in tropical inland waters. Of the former 4 species, Daphnia longisina is represented by a biotype to be referred to a race which inhabits shallow lakes and ponds in the main islands of Japan.
The plankton of this lake in this season consists of 57 species and 3 varieties, 13 of which are the animal plankters. Most species of these plankton animals and plants are of cosmopolitan distribution, with the exceptions of 8 species whose ranges are chiefly in tropical inland waters. Almost all of these 8 species are the inhabitants of the waters of the Oriental Realm, and the occurrence of the Sunda elements such as a diatom Eunotia formica var. sumatrana, blue-green algae Osciliatoria princeps and O.Iwanoffiana is noticeable. One species of diatom Melosira nyassensis is an exceptional, having been known in Lake Nyassa and the adjacent waters in Africa. It is also noted that Acanthodiaptomus pacificus, a typical calanoid of Far Eastern distribution has advanced as far south as to this lake. It has not yet been found in the islands south of the Tokara group.View full abstractDownload PDF (1644K) -
Toshiji TAKEMURA1955 Volume 17 Issue 2 Pages 74-80
Published: June 15, 1955
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe author has performed the observations on the lakes of Kizaki, Noziri and Aoki during the summer partial circulation period and has found that the vertical distribution of density of the lake water is stratified in the metalimnion into two parts, i. e. the layer of upper one and that of lower one He conjectures that the upper layer grows chiefly in the consequence of deposition of the dead remains of plankton and the lower one due to the decomposition of them.View full abstractDownload PDF (944K)
- |<
- <
- 1
- >
- >|