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Validity and historical process of formation of the center of endemism for reptiles in the southern Tokara Islands

Research Project

Project/Area Number 11833013
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research InstitutionUniversity of the Ryukyus

Principal Investigator

OTA Hidetoshi  Tropical Biosphere Research Center, University of the Ryukyus, Associate Proffesor, 熱帯生物圏研究センター, 助教授 (10201972)

Co-Investigator(Kenkyū-buntansha) IZAWA Masako  Faculty of Science, University of the Ryukyus, Associate Proffesor, 理学部, 助教授 (10192478)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsReptiles / Insular isolation / Speciation / Genetic differentiation / Phenetic differentiation / Biogeography / Taxonomy / Tokora Islands
Research Abstract

Three islands of the Tokara Group (Takarajima, Kodakarajima and Kojima), located on the southwestern side of the Tokara Tectonic Strait, are known to accommodate, despite their small areas and low environmental diversities, a group of terrestrial animals that are taxonomically recognized as endemic species. Using the reptiles as a model group, we examined the validity of such a taxonomic view from a phylogenetic standpoint. We also inferred the process. Of formation of such a characteristic fauna in the southern Tokara islands. We conducted molecular phylogenetic analyses for three lineages: (1)Trimeresurus tokarensis, a species endemic to the southern Tokara islands, and T. flavoviridis, a close relative of the former, from the Amami and the Okinawa Groups; (2) Cyclophiops semicarinatus from the southern Tokara Islands, where the species is know to have reduced its body size, and from the Amami and the Okinawa Groups; and (3) a putative undescribed species of the genus Gekko endemic to the southern Tokara islands, and its closest relatives, G. hokouensis and G. yakuensis from the neighboring islands. Of these, lineages (1) and (2) shared a same phylogeographical pattern, (southern Tokara Amami) Okinawa, and very small genetic distances between the former two island groups. The lineage (3), on the other hand, showed a distinct differentiation between representatives from the southern Tokara and other areas. These results suggest that the southern Tokara has been serving as a site for long isolation for some terrestrial organisms, giving rise to phylogenetically distinct entities (as represented by Gekko sp.) on the one hand, and also acted as a site for rapid phenetic changes possibly under extreme insular environments on the other hand.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Ota, H.: "Phylogenetic relationships, toxonomy character evolution, and biogeography of the lacertidlizards of the genus Tokyonomous"Biological Journal of the Linnean Society. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tanaka, K.: "Natural history of two colubrid snakes on Yakushima Island, southwestern Japan"Amphibia-Reptilia. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 太田 英利: "爬虫類・両生類・陸水魚類の遺伝的文化と琉球の古地理"遺伝. 56. 35-41 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Toda, M.: "Biochemical assessment of evolution and taxonomy of the two morphologically poorly diverged geckos"Biological Journal of the Linnean Society. 73. 153-165 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Toda, M.: "Discovery of sympatric cryptic species within Gekko bokouensis (Gekkonidae : Squamata) from Okinawa"Zoologica Scripta. 31. 1-11 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tu, M.-C.: "Phylogeny, taxonomy, and biogeography of the oriental pitvipers of the genus Trimeresurus"Zoological Science. 17. 1147-1157 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H.: "The current geographic faunal pattern of reptiles and amphibians of the Ryukyu Archipelago"Tropics. 10. 51-62 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H.: "Current status of the threatened amphibians and reptiles of Japan"Population Ecology. 42. 5-9 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 太田 英利(小池裕子・松井正文編): "爬虫類(保全遺伝子)"東京大学出版会,東京(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 太田 英利(木村政昭編): "古地理の再構築への現世生物学にもとづくアプローチの強みと弱点:特に琉球の爬虫・両生類を例として(琉球弧の成立と生物の渡来)"沖縄タイムス編,那覇. 206(175-186) (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H.: "Phylogenetic relationships, taxonomy, character evolution, and biogeography of the lacertid lizards of the genus Takydromus (Reptilia: Squamata): a molecula perspective"Biological Journal of the Linnean Society. (in printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tanaka, K.: "Natural history of two colubrid snakes (Elaphe quadrivirgata and Rhabdophis tigrinus) on Yakushima Island, southwestern Japan"Amphibia-Reptilia. (in printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H.: "Genetic divergences in reptiles, amphibians, and inland-water fish of the Ryukyus, with special reference to their paleogeographical implications"Iden (Heredity, Japan). Vol. 56, No.2. 35-41 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Toda, M.: "Discovery of sympatric cryptic species within Gekko hokouensis (Gekkonidae: Squamata) from the Okinawa Islands, Japan, by use of allozyme data."Zoologica Scripta. Vol .31, No.1. 1-11 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Toda, M.: "Biochemical assessment of evolution and taxonomy of tne two morphologically poorly diverged geckos, Gekko yakuensis and G.hokouensis (Reptilia: Squamata), in Japan, with special reference to their occasional hybridizations."Biological Journal of the Linnean Society. Vol.73, No.1. 153-165 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tu, M.-C.: "Phylogeny, taxonomy, and bio geography of the Oriental pitvipers of the genus Trimeresurus (Reptilia: Viperidae: Crotalinae): a molecular perspective"Zoological Science. Vol.17, No.8. 1147-1157 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H: "The current geographic faunal pattern of reptiles and amphibians of the Ryukyu Arvhipelago and adjacent regions"Tropics. Vol.10, No.1. 51-62 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ota, H: "Current status of the threatened amphibians and reprilies of Japan."Population Ecology. Vol.42, No.1. 5-9 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tanaka, K, H.Ota: "Natural history of two colubrid snakes Elaphe quadrivirgata and Rhabdophis tigrinus on Yakushima Island, southwestern Japan"Amphibia-Reptilia. (印刷中).

    • Related Report
      2001 Annual Research Report
  • [Publications] 太田英利: "爬虫類・両生類・陸水魚類が語る琉球の古地理"遺伝. 56(2). 35-41 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Tu,M.-C. et al.: "Phylogeny, taxonomy, and biogeography of the Oriental pitvipers of the genus Trimeresurus : A molecular perspective"Zoological Science. 17(8). 1147-1157 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Toda,M. et al.: "Discovery of sympatric cryptic species within Gekko hokouensis (Gekkonidae : Squamata) from the Okinawa"Zoologica Scripta. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] Toda,M. et al.: "Biochemical assessment of evolution and taxonomy of the two morphologically poorly diverged geckos"Biol.J.Linnean Society. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] Ota,H.: "The current geographic faunal pattern of reptiles and amphibians of the Ryukyu Archipelago and adjacent regions"Tropics. (印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] Ota,H.: "Current status of the threatened amphibians and reptiles of Japan"Population Ecology. (印刷中).

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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