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Evolution in frontier environments

Research Project

Project/Area Number 15340174
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionTohoku University

Principal Investigator

CHIBA Satoshi  Tohoku University, Graduate School of Life Science, Associate professor, 大学院・生命科学研究科, 助教授 (10236812)

Co-Investigator(Kenkyū-buntansha) KASE Tomoki  National Science Museum, Department of Geology, Chairman of the laboratory, 地学研究部, 室長 (20124183)
KAWATA Masakado  Tohoku University, Graduate School of Life Science, Professor, 大学院・生命科学研究科, 教授 (90204734)
YAMASAKI Kazuhito  Kobe University, Faculty of Science, Assistant professor, 理学部, 助手 (20335417)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥16,500,000 (Direct Cost: ¥16,500,000)
Fiscal Year 2005: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2003: ¥8,700,000 (Direct Cost: ¥8,700,000)
Keywordsadaptive radiation / evolution / speciation / species diversity / morphology / mollusca / 多様性 / 変異 / 形質置換 / 小笠原 / 放散 / 競争 / 化石 / 形質開放
Research Abstract

Ecological and genetic process of adaptive radiation were examined using endemic land snail genus Mandarina of the oceanic Ogasawara Islands in the northwestern Pacific. Based on the habitat analysis, morphological analysis, and examination of the mitochondrial DNA sequence variations, we showed that hybridization between sympatric species occurred by alteration of habitat use due to environmental change. This suggests that speciation and adaptive radiation are still in progress in Mandarina. In addition, populations with unique shell morphologies were found in a hybrid zone constituted between morphologically closely related species. This suggests that hybridization is an important source of creating novel morphology and evolutionary novelty.
Phylogenetic relationship among the species of the land snails Euhadra in the mainland of Japan was estimated on the basis of mitochondrial DNA sequences. Repeated expansion and immigration have occurred in Euhadra, associated with climatic change during the Pleistocene. Complex spatial structure in genetic variations was created by mixing and isolation that were accompanied with the climatic change.
Relationship between intertidal gastropoda Batillaria cumingii and its parasites was examined on the basis of ecological, morphological and genetic (mitochondrial DNA and nuclear ITS gene) analysis. Genetic analysis revealed that these parasites include a large number of cryptic species. These species showed less geographical variations in genetic variations. On the other hands, Batillaria showed a high level of geographical variations in genetic components. Ecological speciation due to habitat shift would be a main cause of diversification of parasites in intertidal gastropoda.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (25 results)

All 2005 2004 Other

All Journal Article (22 results) Publications (3 results)

  • [Journal Article] Appearance of morphological novelty in a hybrid zone between two species of land snail.2005

    • Author(s)
      Chiba S
    • Journal Title

      Evolution 59

      Pages: 1712-1720

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Sex and darts in slugs and snails (Mollusca : Gastropoda : Stylommatophora).2005

    • Author(s)
      Davison, A., Wade, C.M., Mordan, P'.B., Chiba
    • Journal Title

      Journal of Zoology (London) 267

      Pages: 329-338

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Polymerase chain reaction-based restriction fragment length polymorphism and sequence analysis reveals cryptic species of trematodes in the intertidal gastropod2005

    • Author(s)
      Miura, O., Kuris, AM., Torchin, ME., Hechinger, RF., Dunham, E., Chiba, S.
    • Journal Title

      International Journal for Parasitology 35

      Pages: 793-801

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Speciation and gene flow between snails of opposing chirality.2005

    • Author(s)
      Davison, A., Chiba, S., Barton, N.H., Clarke B.C.
    • Journal Title

      PLoS Biology 3

      Pages: 1559-1571

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Sex and darts in slugs and snails (Mollusca : Gastropoda : Stylommatophora).2005

    • Author(s)
      Davison, A., Wade, C.M., Mordan, P.B., Chiba, S
    • Journal Title

      Journal of Zoology (London) 267

      Pages: 329-338

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Polymerase chain reaction-based restriction fragment length polymorphism and sequence analysis reveals cryptic species of trematodes in the intertidal gastropod2005

    • Author(s)
      Miura, O., Kuris, A.M., Torchin, M.E., Hechinger R.F., Dunham, E.J., Chiba, S.
    • Journal Title

      International Journal for Parasitology 35

      Pages: 793-801

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Appearance of morphological novelty in a hybrid zone between two species of land snail.2005

    • Author(s)
      Chiba, S.
    • Journal Title

      Evolution 59

      Pages: 1712-1720

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Speciation and gene flow between snails of opposing chirality2005

    • Author(s)
      Davison, A., Chiba, S., Barton, N.H., Clarke B.C.
    • Journal Title

      PLoS Biology 3

      Pages: 1559-1571

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Appearance of morphological novelty in a hybrid zone2005

    • Author(s)
      Chiba.S
    • Journal Title

      Evolution 59

      Pages: 1712-1720

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Speciation and gene flow between snails of opposing chirality2005

    • Author(s)
      Davison, A
    • Journal Title

      PLOS Biology 3

      Pages: 1559-1571

    • Related Report
      2005 Annual Research Report
  • [Journal Article] PCR-based RFLP and sequence analysis reveals cryptic species of trenafoda2005

    • Author(s)
      Miura, O
    • Journal Title

      International Journal of Parasitology 35

      Pages: 793-801

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Sex and darts in slugs and snails2005

    • Author(s)
      Davison A
    • Journal Title

      Journal of Zoology 267

      Pages: 329-338

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Character : sation and cross-amplification of 18microsatellite loci in the Japanese land snail genera Mandarina and Ainohelix (Mollusca, Gastropoda, Pulmonala).2004

    • Author(s)
      Davison, A., Chiba, S., Kawata, M.
    • Journal Title

      Molecular Ecology Notes 4

      Pages: 423-425

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Species-area curve for land snails on Kikai Island in geological time.2004

    • Author(s)
      Marui, Y., Chiba, S., Okuno, J., Yamasaki, K.
    • Journal Title

      Paleobiology 30

      Pages: 222-230

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Enhanced colour polymorphisms in island populations of the land snail Euhadra pelionphala.2004

    • Author(s)
      Hayashi, M., Chiba, S.
    • Journal Title

      Biological Journal of the Linnean Society 81

      Pages: 417-425

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ecological and morphological patterns in communities of land snails of the genus Madarina from the Bonin Islands.2004

    • Author(s)
      Chiba, S.
    • Journal Title

      Journal of Evolutionary Biology 17

      Pages: 131-143

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Characterisation and cross-amplification of 18 microsatellite loci in the Japanese land snail genera Mandarina and Ainohelix (Mollusca, Gastropoda, Pulmonata).2004

    • Author(s)
      Davison, A., Chiba, S., Kawata, M.
    • Journal Title

      Molecular Ecology Notes 4

      Pages: 423-425

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Enhanced colour polymorphisms in island populations of the land snail Euhadra peliomphala.2004

    • Author(s)
      Hayashi, M., Chiba, S.
    • Journal Title

      Biological Journal of the Linnean Society 81

      Pages: 417-425

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ecological and morphological patterns in communities of land snails of the genus Mandarina from the Bonin Islands.2004

    • Author(s)
      Chiba, S.
    • Journal Title

      Journal of Evolutionary Biology 17

      Pages: 131-143

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ecological and morphological patterns in communities of land snails2004

    • Author(s)
      S.Chiba
    • Journal Title

      Journal of Evolutionary biology 17

      Pages: 131-143

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Species area curve for land snails2004

    • Author(s)
      Hayashi M, S.CHIBA
    • Journal Title

      Biological Journal of the Linnean Society 81

      Pages: 417-425

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Characterization of 17 microsatellite Loci in the Japanese land snails2004

    • Author(s)
      Davison A, S.Chiba, M.Kawata
    • Journal Title

      Molecular Ecology Notes 4

      Pages: 423-424

    • Related Report
      2004 Annual Research Report
  • [Publications] Chiba S.: "Ecological and morphological diversification in communities of land snails Mandarina from the Bonin Islands"Journal of Evolutionary Biology. 17. 131-143 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Chiba S.: "Species diversity and conservation of Mandarina an endemic land snail of the Ogasawara"Global Env.Res.. 7. 29-37 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Chiba S.: "Pacific land snails : extinction and conservation of the endemic land snails of the Ogasawara"Tentacle. 11. 13-14 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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