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2005 Fiscal Year Final Research Report Summary

Extinction risks and cofactors of amphibia

Research Project

Project/Area Number 15510194
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Resource conservation science
Research InstitutionOsaka Prefecture University

Principal Investigator

NATUHARA Yosihiro  Osaka Prefecture University, Graduate School of Life and Environmental Sciences, Associate Professor, 生命環境科学研究科, 助教授 (20270762)

Project Period (FY) 2003 – 2005
KeywordsAmphibia / Habitat model / Molecular marker / Population / Extinction risk
Research Abstract

Conservation of biodiversity is the scale dependent in the planning process. At first, priority areas are screened extensively on the national or regional scale by using a simple habitat model. The second step is to design a conservation area in the landscape scale. We developed habitat models for amphibias in this two scales and discussed usefulness of the models in conservation
1.Risk assessment in national scale and phylogeographic study
Presence and absence data were available for the clouded salamander and in Shiga and Osaka Prefecture. Logistic models were used to estimate the potential habitat for these two species. Habitat suitability was estimated using Ecological-Niche Factor Analysis for species in which only presence data are available. Future risks were evaluated for these animals by overlaying land use planning maps with the potential habitat maps. To identify regional population units of H.nebulosus, 420 base pairs were sequenced within the mitochondrial DNA control region … More . Results indicate substantial phylogeographic structuring and strong population-level separations. Four groups were detected among this species.
2.Risk assessment in landscape scale
A habitat model in landscape scale (1 km x 2 km range) was built for the clouded salamander by using a result of ecological survey and a 1/2,500 vegetation map and 10 m DEM. This model was used to estimate extinction risk of the salamander in several scenarios of land change. The risk assessment of metapopulation allows a sophisticate evaluation of environmental impacts in complex landscapes such as Satoyama in Japan.
3.Influence of small dams on the movements of Japanese giant salamander.
A.japonicus move to up stream before their breeding season. But it is predictable that the movement is prevented by small dams. We surveyed. a seasonal movement of A.japonicus and examined the effect of small dams on the movement in Hatuka river of Muko river system in western Japan. We surveyed in 1523 m section of the river that include six dams, and marked 104 individuals. More than 10 individuals moved up stream over each of the dams. But the fact that many individuals were observed just under dams that are taller than 30 cm and 30° in the inclination suggests that A.japonicus cannot pass over those dams without a bypass or a foothold
4.Avoidance responses of (Hynobius nebulosus mediated by predator chemical cue.
We studied antipredator behavior of the clouded salamander (H.nebulosus)larvae. In our experiment, we tested the effects of predatory newt and crayfish, non-lethal effects of tadpole and effects of inexperience fish We found that H.nebulosus can recognize predators not based on visual cue but kairomones emitted by the predator. larvae did not respond to kairomones of predatory fish Carassius auratus which did not inhabit in temporary pool, therefore it suggested that H.nebulosus do not have avoidance response to predator not inhabit the same habitat. Less

  • Research Products

    (16 results)

All 2006 2005 2004 2003

All Journal Article (13 results) Book (3 results)

  • [Journal Article] Landscapd evaluation for ecosystem planning2006

    • Author(s)
      Natuhara Y
    • Journal Title

      Landscape and Ecological Engineering 2

      Pages: 3-12

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Landscape evaluation for ecosystem planning2006

    • Author(s)
      Natuhara, Y
    • Journal Title

      Landscape and Ecological Engineering 2

      Pages: 3-12

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Genetic differentiation among endangered populations of the Japanese clouded salamander, Hynobius nebulosus(Caudata : Hynobiidae).2005

    • Author(s)
      Hirota, T., Natuhara, Y.
    • Journal Title

      Biosphere Conservation 7

      Pages: 1-9

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Genetic differentiation among endangered populations of the Japanese clouded salamander, Hynobius nebulosus (Caudata : Hynobiidae)2005

    • Author(s)
      Hirota T, Natuhara Y
    • Journal Title

      Biosphere Conservation 7

      Pages: 1-9

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] カスミサンショウウオの幼生期間における水位低下と水温,捕食者の影響について2004

    • Author(s)
      森啓彰, 夏原由博
    • Journal Title

      爬虫両棲類学会報 2004

      Pages: 3-11

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 生物多様性と都市の縁2004

    • Author(s)
      夏原由博
    • Journal Title

      都市緑化技術 53

      Pages: 12-17

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of decreasing water level, predation risk, and water temperature on larval period in the clouded salamander, Hynobius nebulosus2004

    • Author(s)
      Mori A, Natuhara Y
    • Journal Title

      Bulletin of the Herpetoogical Society of Japan 2004

      Pages: 3-11

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 生息環境適地とその連続性2003

    • Author(s)
      夏原由博
    • Journal Title

      日本生態学会関東地区会報 51

      Pages: 3-9

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 大阪府と滋賀県におけるカスミサンショウウオの生息地の連続性の評価2003

    • Author(s)
      三好文, 夏原由博
    • Journal Title

      ランドスケープ研究 66

      Pages: 617-620

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 草地と樹林地の配置が動物群集にどう影響するか2003

    • Author(s)
      夏原由博
    • Journal Title

      Grassland Science 48

      Pages: 48

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A Way of Wildlife Conservation and Management in Ecologically Sensitive Area during Road Construction.2003

    • Author(s)
      Natuhara, Y
    • Journal Title

      Proceedings for International Workshop for Reconnecting DMZ Transportation Network Using Environmental Restoration Technology, Seoul

      Pages: 71-79

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaluation of habitat connectivity for Hynobius nebulosus in Osaka and Shiga Prefectures in western Japan2003

    • Author(s)
      Miyoshi F, Natuhara Y
    • Journal Title

      Journal of the Japanese Institute of Landscape Architecture 66

      Pages: 617-620

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of landscape pattern of grassland and woodland on animal communities2003

    • Author(s)
      Natuhara Y.
    • Journal Title

      Grassland Science 48

      Pages: 536-541

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] 生物親和都市の理論と実際2005

    • Author(s)
      森本幸裕, 夏原由博
    • Total Pages
      398
    • Publisher
      京都大学出版会
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] 生態学から見た里やまの自然と保護2005

    • Author(s)
      日本自然保護協会
    • Total Pages
      239
    • Publisher
      講談社
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] 農学から地域環境を考える2003

    • Author(s)
      地域環境を考える会
    • Total Pages
      207
    • Publisher
      大阪公立大学共同出版会
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2007-12-13  

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