Non-metric dental variation of Sakishima Islanders, Okinawa, Japan : a comparative study among Sakishima and neighboring populations
スポンサーリンク
概要
- 論文の詳細を見る
Twenty-four non-metric tooth crown traits of Miyako and Ishigaki Islanders, from the southernmost Ryukyu Islands, were investigated and compared with those of neighboring populations. The frequency of double-shoveling in Sakishima samples, and especially, Ishigaki Island, is lower than that found among Atayal people (Taiwan) and main-island Japanese. The frequencies of protostylid and cusp 6 in Miyako and Ishigaki Islanders are comparable to those in Hokkaido Ainu and lower than in main-island Japanese and Atayal. Miyako and Ishigaki Islanders, as well as other Ryukyuans, are basically more similar to main-island Japanese than to Ainu, while being situated between main-island Japanese and Ainu in terms of both mean measure of divergence (MMD) and R-matrix methods. However, Ishigaki and Miyako Islanders are relatively close to Hokkaido Ainu among Ryukyu people and main-island Japanese, as suggested in some previous preliminary studies. The estimated Fst (the ratio of among-group variation to total variation), using an average heritability rate = 0.55 for the non-metric tooth crown traits used in this study, displayed low levels of inter-regional variation, as already indicated in analyses of genetic, cranial and dental metric data. Meanwhile, the relatively large diversity of Ryukyu Islanders based on Fst suggested long-term isolation or poor intra-island contact among the Ryukyu Islands. The lower observed variation compared with the expected variation in most Ryukyu samples may reflect a greater degree of genetic drift in the Ryukyu Island chain.
- 2007-04-01
著者
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Sunakawa Hajime
Department Of Oral And Maxillofacial Functional Rehabilitation Faculty Of Medicine University Of The
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Sunakawa Hajime
Department Of Oral And Maxillofacial Surgery Faculty Of Medicine University Of Ryukyus
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TOMA Takashi
Department of Anatomy, Faculty of Medicine, University of the Ryukyus
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HANIHARA Tsunehiko
Department of Anatomy and Biological Anthropology, Saga Medical School
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HANEJI Kuniaki
Department of Anatomy, Faculty of Medicine, University of the Ryukyus
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ISHIDA Hajime
Department of Anatomy, Faculty of Medicine, University of the Ryukyus
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Toma Takashi
Department Of Anatomy Faculty Of Medicine University Of The Ryukyus
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Ishida H
Univ. Ryukyus Nishihara
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Ishida Hajime
Department Of Anatomy Faculty Of Medicine University Of The Ryukyus
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Haneji Kuniaki
Department Of Anatomy Faculty Of Medicine University Of The Ryukyus
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Hanihara Tsunehiko
Department Of Anatomy And Biological Anthropology Saga Medical School
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Hanihara T
Department Of Anatomy And Biological Anthropology Saga Medical School
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Hanihara Tsunehiko
Department Of Anatomy Kitasato University School Of Medicine
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