Genetic Diversity of the Natural Monument Nypa fruticans (Palmae) at Funaura, Iriomote Island

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  • SETOGUCHI HIROAKI
    Department of Natural Environment Sciences, Faculty of Integrated Human Studies, Kyoto University
  • WATANABE KAYO
    Department of Natural Environment Sciences, Faculty of Integrated Human Studies, Kyoto University
  • TAKASO TOKUSHIRO
    Iriomote Station, Tropical Biosphere Research Center, University of the Ryukyus
  • NAKAZATO NAGAHIRO
    Okinawa Regional Research Center, Tokai University
  • TOBE HIROSHI
    Department of Natural Environment Sciences, Faculty of Integrated Human Studies, Kyoto University

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Other Title
  • 天然記念物西表島船浦のニッパヤシの遺伝的多様性

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Abstract

Since the population of Nypa fruticans at Funaura on the Iriomote Island was declared as a natural monument in 1959, it has been rapidly reduced in size. Its genetic diversity examined by the Random Amplified Polymorphic DNA (RAPD) method showed that all 28 "individuals" examined but one were genetically identical and had no diversity. They are thus considered clones derived from a single individual by vegetative propagation. Because flowers of a few "individuals" failed to set fertile seeds in 1998, the species is likely to be self-incompatible. A totality of data available indicates that the population at Funaura is at a crisis of extinction.

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