Geographical Variation of Mandible Size and Shape in the Ryukyu Wild Pig(Sus scrofa riukiuanus).

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  • ENDO Hideki
    Department of Zoology, National Science Museum
  • MAEDA Seishi
    Department of Veterinary Anatomy, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • YAMAGIWA Daishiro
    Department of Veterinary Anatomy, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • KUROHMARU Masamichi
    Department of Veterinary Anatomy, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • HAYASHI Yoshihiro
    Department of Veterinary Anatomy, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • HATTORI Shôsaku
    Amami Branch Laboratory, Institute of Medical Science, The University of Tokyo
  • KUROSAWA Yaetsu
    Cattle Museum, Maesawa-cho
  • TANAKA Kazue
    Department of Animal Breeding, Faculty of Agriculture, Tokyo University of Agriculture

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タイトル別名
  • Geographical variation of mandible size

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説明

We measured adult mandibles of Ryukyu wild pigs from Amami-Oshima, Kakeroma, Okinawa, Ishigaki and Iriomote Islands. The size cline was not statistically recognized among the populations of Nansei Islands. The Ishigaki population was significantly larger than Iriomote one in mandible length. Some measurement ratios indicated that the ramus is enlarged laterally and that the body of mandible is dorso-ventrally developed in Ishigaki and Iriomote populations. The Amami-Oshima mandibles were relatively smaller than those of Okinawa and Iriomote populations in length item of body of mandible. These results will contribute to the zoo-archaeology on the historical change of size and shape in the island populations, and to the evolutionary biology on the morphological adaptation of this animal.

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