Honyurui Kagaku (Mammalian Science)
Online ISSN : 1881-526X
Print ISSN : 0385-437X
ISSN-L : 0385-437X
Volume 50, Issue 1
Displaying 1-19 of 19 articles from this issue
Original Articles
  • Noriko Funasaka, Motoi Yoshioka, Keiichi Ueda, Makio Yanagisawa, Hirok ...
    2010 Volume 50 Issue 1 Pages 1-11
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    Diurnal fluctuations of seven hematological and 17 blood biochemical parameters were investigated in the winter solstice, spring equinox and summer solstice in captive Indo-Pacific bottlenose dolphins Tursiops aduncus. Blood sampling and feeding were conducted in three hour intervals for 24 h from four adult healthy males (estimated age; 36 to 39 years) kept in natural environmental conditions. HT, BUN, UA, TG, HGB, RBC, WBC, T-CHO, ALP and K showed diurnal rhythms, and four presented especially obvious diurnal rhythms with the lowest at 18:00 h in HT, and peaks during the evening or night in BUN, UA and TG (P<0.01). Acrophases of diurnal rhythms in these four parameters were not significantly different among the three seasons studied, and we suggested that these rhythms entrained environmental light-dark cycles and were controlled by endogenous circadian clock in the captive dolphins. Other parameters showed different three patterns: 1) irregular pulsed fluctuation (Eos, Alb, GOT, GPT, T-Bil, CPK, Na and Cl), 2) increase or decrease over time (Cre and Glu), and 3) no major changes throughout the day (Neut, Lym, TP and LDH).
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  • Shigenori Kondo, Ikuko Kanda, Yoshinari Ishida, Yasunobu Nabeshima
    2010 Volume 50 Issue 1 Pages 13-20
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    To evaluate the distribution and density of finless porpoise in Osaka Bay, we analyzed encounter records from the research ship “Osaka” and line-transect sighting surveys by a ferry were conducted in the central bay. According to records, the research ship encountered 25 groups for 263 days from April, 2004 to December, 2007. Although the survey area widely covered the bay, encounters were limited to the sea from Misaki-cho to Kishiwada-shi (34°21′–32′N, 135°8′–20′E). Sighting surveys were carried out on the track line of a ferry-boat between Izumisano port and Tuna port from October, 2005 to January, 2007. We surveyed 4,403 km under the conditions of Beaufort wind force scale ≤ 2, and detected 72 porpoises. Most sightings were observed in the eastern part of the track line (34°23′–26′N, 135°8′–13′E). The density of the porpoises increased from March to July, with highest density (0.238 porpoises/km2) in April. These results suggest that the main distributional area of finless porpoises is in the eastern part of Osaka Bay and the abundance is higher in spring through early summer.
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  • Kazuo Wada, Yuzuru Hamada, Yupeng Li, Qihai Zhou, Jiengpo Jiang, Cheng ...
    2010 Volume 50 Issue 1 Pages 21-29
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    We conducted distribution survey of four species belonging to genus Macaca in Guangxi about ten days in 2005 and two months in 2008. We collected monkey information and directly observed monkeys in and around eight nature reserves in northern and western part of Guangxi. While Macaca mulatta was distributed in all the areas surveyed on 100–300 m asl, M. thibetana patchily occupied the more than 400–500 m asl in the northern part of Guangxi, and M. assamensis patchily occupied 200–400 m asl areas in the centro-southern part. It seems that the distribution patterns of M. thibetana and M. assamensis result from inter-specific relations with M. mulatta during Pleistocene periods.
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  • Yui Nemoto, Kazuhiko Hoshizaki, Teruki Oka
    2010 Volume 50 Issue 1 Pages 31-35
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    The number of nuisance black bears Ursus thibetanus caught from April to June fluctuates between years. This study analyzed the relationship between the number of bears caught in Akita and Iwate prefectures and several conceivable factors, including the timing of snow melt in spring and the beechnut production level in the preceding year. In Akita, the number of bears caught negatively correlated to the date of snow melt in spring, indicating that earlier thaw was likely to cause to more captured nuisance bears. In Iwate, either of these factors did not explain the fluctuations in the number of nuisance bears caught.
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  • Akira Sano
    2010 Volume 50 Issue 1 Pages 37-41
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    From March 2007 to November 2009, morphological changes in bark-feeding traces on the trunks carved by sika deer (Cervus nippon) were investigated in 11 young and middle-aged sugi (Cryptomeria japonica) and hinoki cypress (Chamaecyparis obtusa) plantations in Mie Prefecture, central Japan. In the tree growing season (March–September), cambium was peeled off together with bark, and morphological changes accompanied with histogenesis were not observed on the exposed surface of the xylem after debarking. In trees debarked during the non-growing season (December–February), the outer bark was stripped off leaving the inner bark adhering to the xylem, and many tooth-marks were observed on the inner bark. However, in trees with a relatively small number of tooth-marks, occlusions caused by enlargement of the xylem around tooth-marks were sometimes observed. The trees damaged in the growing and non-growing seasons were still distinguishable from each other even after two growing seasons.
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Short Communications
Report
  • Hisashi Abe
    2010 Volume 50 Issue 1 Pages 55-66
    Published: 2010
    Released on J-STAGE: July 23, 2010
    JOURNAL FREE ACCESS
    We surveyed burrow size to discriminate mole species and determined the front edge of the range of Mogera wogura in 2009 in eight regions in central Honshu where this species competes with and displaces M. imaizumii. Of the 2 river basins in Nagano Prefecture where front edges had been found in 1959, the front at Agematsu Town in the Kiso River basin has advanced about 4.1 km in the past 50 years. In the other, the Tenryu River basin, a 2.4 km advance along a tributary, the Ono River and 16 km advance along the main stream were observed at the fronts. In the Fuji River basin, the front was found at first in the present survey in a gorge with flat gravelly bottom, situated about 16 km downstream of the Kofu Basin, the most upstream basin. The front in the Kanazawa Plain, Ishikawa Prefecture, did not largely change in the 11 years after the first survey in 1998. In the region ranging over Shizuoka and Kanagawa Prefectures, it was concluded that the central mountain ranging from the north to the south between the prefectures was a temporary barrier blocking the range expansion of M. wogura.
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Award Recipients
A Report on the Japan and Taiwan Cooperative Symposium 1 at the Annual Meeting
Reports on the Workshop at the Annual Meeting of the Mammalogical Society of Japan (2009)
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