Honyurui Kagaku (Mammalian Science)
Online ISSN : 1881-526X
Print ISSN : 0385-437X
ISSN-L : 0385-437X
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Volume 47, Issue 2
Displaying 1-11 of 11 articles from this issue
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Review
  • Threatened arboreal squirrels in Kyushu, southwestern Japan
    Masatoshi Yasuda
    2007 Volume 47 Issue 2 Pages 195-206
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.195
    JOURNAL FREE ACCESS
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    Historical trends of three threatened arboreal squirrels (Sciurus lis, Pteromys momonga and Petaurista leucogenys) in Kyushu, southwestern Japan, were studied. Various kinds of literature since the 18th century, including published papers and reports, national and local red data books, observation records, hunting statistics, and fur trade records, were compiled and evaluated. I suggest that 1) Sciurus lis was distributed locally in Kyusyu in the early 20th century but no specimens have been examined by researchers, 2) during the last 50 years, the number of observation records of Pteromys momonga from Kyushu decreased and the present distribution is unknown, and 3) the distribution of Petaurista leucogenys diminished. These species need urgent actions to conserve their local populations in Kyushu.
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Original Articles
  • Survey of the number of seals incidentally caught by salmon trap nets along the coastal waters of the Nossapu Cap in Nemuro Peninsula from 2002 to 2003 compared with the survey from 1982 to 1983
    Mari Kobayashi, Tsuyoshi Ishinazaka, Chiharu Kakumoto, Hisashi Wakatab ...
    2007 Volume 47 Issue 2 Pages 207-214
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.207
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    A total of 261 seals were incidentally caught by 15 salmon trap nets of the Habomai Fisheries Cooperative Association from September to November in 2002 and 2003 (00 years’ survey). No difference was found between the number of seals in the 00 year’s survey and the number (272 seals) in the survey from September to November in 1982 and 1983 (80 years’ survey). No differences were found in species ratio [dominant and the next species were harbor (Phoca vitulina stejnegeri) and spotted seals (P. largha)], and in the positions of salmon trap nets in which most of the seals were incidentally caught between both surveys, respectively. However, there was a significant difference between the rates of harbor and spotted seals of all incidentally caught animals between both surveys (91.2% and 7.7% in the 00 years’ survey and 77.6% and 20.6% in the 80 years’ survey, respectively). The frequency distribution of incidentally caught seals showed two peaks in the middle of September and November in the 80 years’ survey, the other side, a peak in the beginning of September when the salmon trap net fishery started with gradual decrease until November in the 00 years’ survey. The distribution centers of harbor seals and spotted seals are thought to be in the southern area of the Kuril Islands, especially concentrated in Habomai and Shikotan Islands. Therefore, further research on the relationship between the East-Hokkaido group and the Habomai-Shikotan group are necessary to their conservation.
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Short Communications
  • Reproductive activity of the large Japanese field mouse (Apodemus speciosus) in the Oze district in northeastern Honshu, Japan
    Takashi Tateishi
    2007 Volume 47 Issue 2 Pages 215-220
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.215
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    Reproductive activity of the large Japanese field mouse (Apodemus speciosus) was studied in woodlands at an altitude of 1,000–1,900 m in the Oze district in northeastern Honshu, Japan. The present surveys were carried out from mid-July to early August of each year during 1985 to 1999 except for 1986 and 1991. Males with body weights of 30.1 g or more and females with body weights of 25.1 g or more were regarded as adults, according to the developmental conditions of genital organs. I estimated that 45.8% (125/273 individuals) of adult males and 16.4% (37/225 individuals) of adult females were considered to be reproductive. As a lactating pregnant female was captured, some females seemed to become pregnant twice or more during each breeding season. It was supposed that the breeding season, including the copulation period, of A. speciosus in this survey area seemed to date back to late May, judging from the estimated birth time of the captured juveniles. Therefore, it seemed that the breeding season in A. speciosus in this area ranged from at least May until August.
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  • Examination of blood coagulation time in captive cetaceans and pinnipeds
    Kaoru Kohyama, Shiroh Yonezaki
    2007 Volume 47 Issue 2 Pages 221-225
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.221
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    In order to elucidate the factors in extension of blood coagulation time in cetaceans, a screening test of blood coagulation time was performed for four species of delphinids in the Cetacea and one species of pinniped in the Carnivora, and blood coagulation factors were examined in three species of cetaceans and one species of pinniped. Extension of active partial thromboplastin time (APPT) and an obviously lower level of XII factor (Hageman factor) activity were clearly observed in the cetaceans. These factors seemed to involve the extension of blood coagulation time in the cetaceans. On the other hand, we obtained different values in the pinniped, which did not show any extension of blood coagulation time.
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  • Scanning electron microscopic studies on the connective tissue cores of the lingual papillae of the large flying fox
    Shoichi Emura, Hery Wijayanto, Yasuro Atoji
    2007 Volume 47 Issue 2 Pages 227-230
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.227
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    The connective tissue cores (CTCs) of the lingual papillae of the large flying fox Pteropus vampyrus were examined by scanning electron microscopy (SEM) and compared to those of other animals. The filiform papillae of the large flying fox showed a spoon-like shaped CTCs at the apex of the tongue and showed bifid and trifid CTCs at the body of the tongue. The transitional forms were observed between their CTCs of the filiform papillae. The CTC of the round central papilla of the vallate papilla was covered with numerous small spines.
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Reports
  • Current distribution of Sciurus lis in the Chugoku district, Japan
    Noriko Tamura, Ryuhei Matsuo, Toshio Tanaka, Tomomi Kataoka, Minato Hi ...
    2007 Volume 47 Issue 2 Pages 231-237
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.231
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    The Japanese squirrel Sciurus lis Temminck has been categorized as a threatened local population in the Chugoku district in 2002, although we lack information of present distribution. In this study, we conducted a survey at 363 sites in the mountainous area of the Chugoku district and revealed that the squirrel is quite rare in the western area from 133°30′ east longitude, but relatively common in central to eastern Tottori Prefecture.
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  • Bat fauna in Tsushima, Nagasaki, Japan
    Kuniko Kawai, Dai Fukui, Sumiko Matsumura, Takumi Akasaka, Mitsuru Muk ...
    2007 Volume 47 Issue 2 Pages 239-253
    Published: 2007
    Released on J-STAGE: January 31, 2008
    DOIhttps://doi.org/10.11238/mammalianscience.47.239
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    The bat fauna of Tsushima, north of Nagasaki in Japan, was investigated from 2003 to 2006. We located 26 artificial underground structures and inspected them for bat presence. A total of 267 individuals representing six species and two families were captured (Rhinolophidae: Rhinolophus cornutus, Rhinolophus ferrumequinum; Vespertilionidae: Miniopterus fuliginosus, Myotis macrodactylus, Myotis formosus, and Murina ussuriensis). The four individuals of Myotis formosus were the first records of this species for 38 years.
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Forum
Report on the International Conference
Memoirs of the Late Dr. Yoshinori Imaizumi
Book Reviews
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