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Volume 31 (1975)
- Issue 6 Pages 227-
- Issue 5 Pages 179-
- Issue 4 Pages 139-
- Issue 3 Pages 109-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 31, Issue 3
Displaying 1-5 of 5 articles from this issue
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Akihiko KUWAHARA, Makoto KASHIWAI, Masatosi SINODA1975 Volume 31 Issue 3 Pages 109-114
Published: June 30, 1975
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSContinuous sampling of the plankton with a pump sampler was carried out along a 960 m straight-line course in Maizuru Bay. The 25 collections of plankton were successively obtained at a depth of 1.5 m along the course, each of the collections covering a horizontal distance of 38 m. Vertical samplings of the plankton were done at five different depths (90, 120, 150, 180 and 210 cm) at 13 stations along the course. In both kinds of samplings temperature and chlorinity were measured.
In the horizontal distribution ofF. taraikaensis, it was demonstrated that the counts of plankton had no correlation with the temperature and chlorinity in situ. There was a correlation between the counts and the differences of temperature and chlorinity between two successive sampling stations. It seemed thatF. taraikaensiswas most abundant in the locations where the temperature difference was greater than +0.2°C and the chlorinity difference was greater than +0.04‰. This species was more abundant around the steep thermocline and the steep halocline. When the vertical profiles of temperature and chlorinity did not show steep gradients, this species was more abundant near the surface.View full abstractDownload PDF (895K) -
Regional and Seasonal Occurrences of the Important ZooplanktonReiichiro HIROTA, Makoto HARA1975 Volume 31 Issue 3 Pages 115-123
Published: June 30, 1975
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe occurrence of the zooplankton at 21 stations in Yatsushiro-kai, western Kyushu, was investigated in June, September and November of 1968, and March of 1969. Copepods formed the most predominant constituent among the collected zooplankton. Although Paracalanus parvus was abundant in most of the surveyed region, other copepods occurred. dominantly in the following order when going from the northeastern area toward the southwest:
Oithona nana→Acartia clausi→Microsetella norvegica→Oithona similis→Corycaeusspp. Yatsushiro-kai can be characterized biologically by dividing it into two main regions. The northern half is more embaymental and the southern half is more oceanic, bordered by an area where Microsetella norvegica occurred as the dominant. The area where Acartia clausi occurred dominantly is the most embaymental in the northern half, and the area where Corycaeus spp. occurred dominantly is the most oceanic in the southern half.View full abstractDownload PDF (3278K) -
Yuji FUJITA, Buhei ZENITANI1975 Volume 31 Issue 3 Pages 124-130
Published: June 30, 1975
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe distribution of phototrophic bacteria was investigated during the summers of 1969 and 1970 in Omura Bay of western Kyushu. Phototrophic sulfur- and nonsulfurbacteria were distributed numerously in the mud and bottom water. Brown strains usually dominated in number. In water column, other than bottom water, there were usually few or no phototrophic bacteria. On occasion, however, a large number of brown bacteria were found in the middle of water column.
Six strains, two each of the purple, green and brown bacterial colonies, were isolated from mud and sea water. The purple and green bacterial strains were identified as belonging to the generaChromatiumandChlorobium, respectively. The brown strains could not be identified using Bergey's manual, but were found to be similar to the brownChlorobiumdescribed by PFENNIG. All six strains required sulfide for growth. Heterotrophic tendency was greater for the purple and green strains than for the brown strains. Their growth was enhanced by the addition of thymine. Living cells, taken from enrichment cultures of mud samples from four stations, gave absorption spectra almost identical to the spectrum of brownChlorobium. Thus it appears that during the summer brownChlorobiumis the dominant phototrophic bacterial group in Omura Bay.View full abstractDownload PDF (3177K) -
Takeshi KAJIHARA, Yoshinori URA, Miyako TACHIBANA1975 Volume 31 Issue 3 Pages 131-135
Published: June 30, 1975
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSA large number of tar globules with sessile organisms were collected from the surface tows taken with larval nets in the waters around the Ryukyu Islands during November and December, 1973. Bryozoans (one species), tubeworms (Serpulidae, Janua (Dexiospira) foraminosa (MOORE & BUSH)) and goose barnacles (Lepas pectinataSPENGLER, L. anatiferaLINNE) were the most important species of sessile animals found on these tar globules. Sinking of tar globules by Lepasof middle or large size was suggested from the differences in their specific gravity.View full abstractDownload PDF (763K) -
Kenzo TAKANO, Sawa MATSUYAMA1975 Volume 31 Issue 3 Pages 136-138
Published: June 30, 1975
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSA brief description is given of the inclination and bearing of cylindrical current meters moored by a subsurface buoy and a lead on the bottom, with relation to speed and direction of the measured water flow.View full abstractDownload PDF (486K)
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