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Geographic variation and biogeography of terrestrial vertebrates around the Tokara Strait, northern Ryukyus, Japan

Research Project

Project/Area Number 09839024
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 自然史科学
Research InstitutionUniversity of the Ryukyus

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) HIKIDA Tsutomu  Graduate School of Science Kyoto University Associate Professor, 理学研究科, 助教授 (40135512)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsReptiles / Biogeography / Geographic variation / Speciation / Geographic isolation / Dispersal / Ryukyu Archipelago / Tokara Strait
Research Abstract

The Tokara Strait, usually regarded as a boundary of the Oriental and Palearetic faunal realms, is considered to have been consistently interrupting dispersals of terrestrial fauna since its initial formation in the late Tertiary. However, several lineages of terrestrial animals are actually distributed on both sides of this strait, making interesting subjects from view points of historical biogeography and population systematics. To elucidate the dispersal and isolation of terrestrial animals across the Tokara Strait, we examined for several vertebrates the relative degrees of differentiations among populations around this strait. Quantitative morphological and allelic data were analyzed for distances among populations.
Results have indicated that in most lineages examined, such as Ateuchosaurus pellopleurus, Gekko hokouensis and Eumeces marginatus, populations in both sides of the strait showed very little variation. This indicates the occurrence of oversea dispersals across the strai … More t in an unexpectedly high frequency in these lineages. This results strongly suggest the possible overstimation of the isolation effect of insularization upoiv the terrestrial organisms in other areas of the Ryukyus and Taiwan, where the Kuroshio Current, seemingly the most influensive agent of orga-nismal dispersals in this region, is dominant as in the Tokara Strait.
Some taxonomic groups showing more sporadic distributions on both sides of the strait have been considered as remnants of landbridge dispersals prior to the formation of the Tokara Strait. However, our studies have revealed that there are no sister-relationships between representatives of both sides of the strait in some of such taxa (e.g., Cistoclemmys, including the fossil taxa), and that others (e.g., Pelodiscus sinensis), surely showing close genetic affinities, have been transported artificially across the strait. Such a result circumstantially support the frequent seacurrent-aided dispersal hypothesis for the former three lineages by confirming the long history of the Tokara Strait. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Ota,H.: "Systematic review of the elapid snakes allied to Hemibungarus japoni-cus (Gunther,1868) in the East Asian Islands." Journal of Herpetology. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota,H.: "Geographic variation in the endemic skink,Ateuchosaurus pellopleu-rus (Reptilia:Squamata) from the Ryukyu Archipelago,Japan" Journal of Herpetology. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota,H.: "Geographic patterns of endemism and speciation in amphibians and rep-tiles of the Ryukyu Archipelago,Japan." Researches on Population Ecology. 40・2. 189-204 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kumazawa,Y.: "The complete nucleotide sequence of a snake (Dinodon semicarinatus)mitochondrial genome with two identical control regions." Genetics. 150・2. 313-329 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hikida,T.: "Biogeography of reptiles in the subtropical East Asian islands" Proc.Symp.Phyl.,Biogeogr.Conserv.Fauna Flora East Asian region. 1997. 11-28 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Toda,M.: "Genetic variation among insular populations of Gekko hokouensis (Reptilia:Squamata)" Zoological Science. 14・4. 859-867 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota,H.: "Tropical Island Herpetofauna:Origin,Diversity and Conservation" Elsevier Science(印刷中),

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota,H.: "A catalogue of amphibian and reptile specimens from the East Asian is-lands deposited in the National Science Museum,Tokyo." 国立科学博物館(印刷中),

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota, H.: "Systematic review of the elapid snakes allied to Hemibungarus japonicus (Gunther, 1868) in the Easut Asian Islands" Journal of Herpetology. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota, H.: "Geographic variatin in the endemic skink, Ateuchosaurus pellopleurus (Reptilia : Squamata) from the Ryukyu Archipelago, Japan" Journal of Herpetology. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota, H.: "Geographic patterns of endemism and speciation in amphibians and reptiles of the Ryukyu Archipelago, Japan" Researches on population Ecology. Vol.40, No.2. 189-204 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kumazawa, Y.: "The complete nucleotide sequence of a snake (Dinodon semicarinatus) mitochondrial genome with two identical control regions" Genetics. Vol.150, No.2. 313-329 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hikida, T.: "Biogeography of reptiles in the subtropical East Asian islands" Proc.Symp.Phyl.Biogeogr.Cons.Fauna Flora of East Asian Region. 11-28 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Toda, M.: "Genetic variation among insular populations of Gekko hokouensis (Reptilia : Squamata)" Zoological Science. Vol.14, No.4. 859-867 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota, H.(ed.): Tropical Island Herpetofauna : Origin, Diversity and Conservation. Elsevier Science, Amsterdam,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota, H.: A Catalogue of Amphibians and Reptile Specimens from the East Asian Islands Deposited in the National Science Museum, Tokyo. The National Science Museum, Tokyo,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ota,H.: "Systematic review of the elapid snakes allied to Hemibungarus japoni-cus(Gunther,1868)in the East Asian Islands." Journal of Herpetology. (発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ota,H.: "Geographic patterns of endemism and speciation in amphibians and rep-tiles of the Ryukyu Archipelago,Japan." Researches on Population Ecology. 40・2. 189-204 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ota,H.: "Tropical Island Herpetofauna:Origin,Diversity and Conservation" Elsevier Science(発表予定), (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ota,H.: "Historical biogeographical implications in the variation and diversity of amphibians and reptiles in Taiwan" Proc.Symp.Phyl.,Biogeogr.Conserv.Fauna Flora East Asian region. 1997. 75-86 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ota,H.: "Geographic variation in the endemic skink,Ateuchosaurus pellopleurus(Reptilia:Squamata)from the Ryukyu Archipelago,Japan" Journal of Herpetology. (印刷中).

    • Related Report
      1997 Annual Research Report
  • [Publications] Hikida,T.: "Biogeography of reptiles in the subtropical East Asian islands" Proc.Symp.Phyl.,Biogeogr.Conserv.Fauna Flora East Asian region. 1997. 11-28 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Toda,M.: "Genetic variation among insular populations of Gekko hokouensis(Reptilia:Squamata)" Zoological Science. 14・4. 859-867 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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