The Natural Environmental Science Research
Online ISSN : 1883-1982
Print ISSN : 0916-7595
Volume 5
Displaying 1-9 of 9 articles from this issue
  • Mizuko YOSHIYUKI
    1992 Volume 5 Pages 1-5
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
    JOURNAL OPEN ACCESS
    Japanese Asahi Newspaper reported on 9th February of 1985 that a masked parm civet firstly was collected from Okushiri Island off Hokkaido, Japan on 13th December of 1984. I have examined external characters, skulls and teeth of specimens and the other which was collected from the Island on December of 1986.
    As a result, these specimens have been identified Paguma larvata, and very similar to that of series of Honshu and Shikoku. As the species hitherto unknown to the Island, these records show biogeographical interest.
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  • Takashi NIREI
    1992 Volume 5 Pages 7-20
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    Pollen analytical studies were conducted on two core samples from a concave basin-like area thought to have been caused by submarine landslides, on the west slope of the Senoumi bank in Suruga Bay.
    The core sample C was taken from the location at 34°44.10'N, 138°27.00'E, 582 m in depth. The core D was taken from the location at 34°43.32'N, 138°27.55'E, 489 m in depth.
    Both cores consisted of obviously different two parts as the unconsolidated upper part and the subconsolidated lower part.
    The fossil pollen assemblage of the upper part was characterized by dominance of Pinus (subgen. Diploxylon). That of the lower part,though,was dominated by pollen of conifer and deciduous broad-leaved trees of the cool-temperate zone in the case of the core C and pollen of Cryptomeria and Sciadopitys in the case of the core D.
    The assemblage of the upper part is correlative to the pollen zone I of the deposits in the Suruga Bay4, 5). The age of this zone has been considered to be younger than 1,000 years ago.
    On the other hand, the assemblage of lower part has been considered to be about the age of 7,000 years ago.
    Thus,there is a deficiency of at least 6,000 years of accumulation of deposits between the unconsolidated part and the subconsolidated parts of the core samples, and it is considered to be the result of the submarine landslides of about 1,000 years ago.
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  • Masahiro SHIBA, Yuji ABE, Miwa FUKUDA, Kenji YOKOYAMA, Shintaro HORIUC ...
    1992 Volume 5 Pages 21-32
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    The lithology and fossils of the Numakubo gravel and silt Member (Ihara Group; Pleistocene) distributed on the riverbed of the Fujikawa at Fujinomiya,Shizuoka Prefecture are reported on in this paper.
    The Numakubo gravel and silt Member is divided into three beds in ascending order: The lower beds is consisted of gravel deposited by river activity near the estuary. The middle beds, which are characterized by silt ands and, are divided into lower and upper portions. The lower portion consists of silt and sand with rootlets. The upper portion consists of silt ands and with burrows. The lower portion is deposited on the back marsh, and the upper portion is deposited on the shallow sea-bottom of the embayment. The upper beds consist of gravel and sand deposited by river activity on the back marsh. Cervus fossils have been found in the calcareous nodules included in the upper portion of the middle beds.
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  • Shuji YACHIMORI, Yuji YAMAMOTO
    1992 Volume 5 Pages 33-42
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    An information survey was conducted through interviews with 21 households that have been feeding Nyctereutes procyonoides viverrinus, and a questionnaire of 1542 students of elementary and junior high school and their parents in Hachioji. Results suggest that the reproductive cycle of N. procyonoides viverrinus in Hachioji has the following pattern. The etrus and mating season runs from about December through March peaking around February, with their delivery season running from around February through May and peaking around April. They break up and disperse starting from August peaking around October. Further,young from the previous year were observed participating in caring for new born baby.
    Both the inquiry survey and questionnaire indicated the presence of individuals with epilation. Several characteristics such as hair loss all over the body, swelling and thickening of the epidermis, and frequent scratching were observed in these individuals. They were presumed to have scabies or mange. Individuals exhibiting epilation were first confirmed around August of 1988 and appeared at all the households by June of 1990.
    Since August of 1990, few individuals have been observed at these households nor have there been any reported observations of these animals.
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  • Hiroyuki AKIYAMA
    1992 Volume 5 Pages 43-55
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    Bryophytes as rheophytes in wet tropical regions in Southeastern Asia are treated on the basis of the author's field studies, which were made during the last three expeditions to the Malay Peninsula and Kalimantan, Indonesian Borneo.
    More than twenty species of rheophytes of mosses and hepatics were recognized. The representative species, including Calymperes taitense, Sclerohypnum littorale, Fissidens beccarii, Fissidens aff. nobilis, Cyptodontopsis obtusifolia, Neckeropsis fleischeri, Thamnobryum ellipticum, Pallavicinia sp. and Plagiochila sp., were introduced with notes on their habitats
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  • Ryozo WATANABE
    1992 Volume 5 Pages 57-72
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    Thuidium is the largest genus of the family Thuidiaceae, comprising about 200 species in the world. Of these species,15 are found in Japan. This paper illustrates the Japanese species of the genus Thuidium.
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  • Yoshinori MINAMI
    1992 Volume 5 Pages 73-78
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    Epiphytic bryophytes and lichens in urban and suburban areas were investigated. Thy were growing under the influence of various factors caused by serious urbanization including air pollution, desiccation and others. The changes of the composition of species for epiphytic bryophyte and lichen communities along the gradient of NOX concentration were studied in Kanagawa Prefecture, where the obvious urbanization gradient was found from the northeastern maritime industrial zone to the southwestern rural zone. On the basis of the results obtained from the present survey,this study area was divided into four zones (Zone A-D),according to the difference of epiphytic community. Zone A, a species rich zone and characterized by the occurrence of such rural species as Parmelia spp. and Clastobryella kusatsuensis, is located only in the southwestern part of the prefecture. On the contrary, Zone D,a species poor zone and characterized by the presence of such wide spread species as Lepraria sp., is located in the northeastern industrial zone. Both Zones B and C are located between Zones A and D, and they contain the composition of species which are intermediate between the composition of species in Zones A and D. These composition of species are similar to that found in Zone A,but lacking the species most sensitive to the air pollution. Zone B shows more rural characteristics than zone C. The latter was,however, also located in the central part of the prefecture which is commonly occupied by zone B. This suggests that the secondary pollution originated from maritime industrial zone could affect the composition of species in the epiphytic community along the river.
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  • Ken-ichiro NEGORO
    1992 Volume 5 Pages 79-82
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    In the adjoining seas of Japan, the most common plankton diatom of the genus Asterionella is Asterionella japonica CLEVE. Asterionella kariana GRUNOW, A. bleakeleyi W. SMITH, and A. notata GRUNOW are also found, but always rarely and moreover in a small amount (S. KOKUBO, 1960)1).
    In inland waters of Japan are commonly found two species of the genus Asterionella, namely Asterionella formosa HASSALL and A. gracillima (HANTZSCH) HEIBERG. But Asterionella gracillima is now generally recognized as a variety of Asterionella formosa. Besides are known AsterioneIla subtilissima MEISTER and Asterionella inflata HEIBERG.
    Asterionella zigzagostellata ELENKIN, which was reported by H. HIROSE (1950)2) as a common plankton diatom of Lake Abashiri, Hokkaido, is none other than Diatoma elongatum (LYNGB.) AG.
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  • Naoki NISHIMURA, Kuniko WATANABE
    1992 Volume 5 Pages 83-101
    Published: November 25, 1992
    Released on J-STAGE: December 25, 2024
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    Surface ornamentation of peristome teeth is examined by SEM for 19 species of 8 families of Isobryales. Detailed description and SEM micrographs of the surface ornamentation are given for each species.
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