Multivariate Analysis in Skull Osteometry of the Common Tree Shrew from Both Sides of the Isthmus of Kra in Southern Thailand.

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  • ENDO Hideki
    Department of Zoology, National Science Museum, Tokyo, Shinjuku-ku, Tokyo 169-0073, Japan
  • NISHIUMI Isao
    Department of Zoology, National Science Museum, Tokyo, Shinjuku-ku, Tokyo 169-0073, Japan
  • HAYASHI Yoshihiro
    Department of Veterinary Anatomy, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
  • Bin Mohd RASHDI Azmin
    Department of Wildlife and National Parks, Kuala Lumpur, Malaysia
  • NADEE Nivesh
    Energy and Environment Research Department, Thailand Institute of Scientific and Technological Research, Bangkok, Thailand
  • NABHITABHATA Jarujin
    Reference Collection Division, National Science Museum, Thailand, Bangkok, Thailand
  • KAWAMOTO Yoshi
    Primate Research Institute, Kyoto University, Aichi, Japan
  • KIMURA Junpei
    Department of Veterinary Anatomy, College of Bioresource Sciences, Nihon University, Kanagawa 252-8510, Japan
  • NISHIDA Takao
    Anatomy and Physiology, College of Bioresource Sciences, Nihon University, Kanagawa 252-8510, Japan
  • YAMADA Junzo
    Department of Veterinary Anatomy, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan

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説明

The Isthmus of Kra in Southern Thailand consists of a lowland of about 70 km in length. It has been suggested that the Isthmus may sink beneath the sea surface according to the change of level of the sea, and may function as a zoogeographical barrier in land mammals in this region. So, the geographical variation was osteometrically examined in skull of the common tree shrew (Tupaia glis) from the both sides of Isthmus of Kra. The osteometrical examination demonstrated that the skull is larger in southern population than in northern one. In the charts of the principal component analysis, however, the morphological separation between two populations can not be obviously seen in female. While, the results of the discriminant analysis indicated the morphological separation between the two populations. These findings suggest that the zoogeographical barrier of Istmus of Kra may have influence on the osteometrical variation in the common tree shrew, when the Isthmus was covered with sea.

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