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From Stability to Chaos : analyses on niche separation and population processes generating chaotic dynamics in 1 host-2parasitoid systems

Research Project

Project/Area Number 09640747
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionThe University of Tokyo

Principal Investigator

SHIMADA Masakazu  The University of Tokyo, Graduate School of Arts and Sciences, Associate Professor, 大学院・総合文化研究科, 助教授 (40178950)

Co-Investigator(Kenkyū-buntansha) 津田 みどり  九州大学, 農学部, 助手
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsSystem stability / Persistence / Population dynamics / Host-parasitoid system / Mutual interference / Niche separation / Simulation / Chaotic dynamics / 系の安定性 / 寄主-寄主蜂系 / 寄生効率 / カオス生成 / マメゾウムシ / 寄生蜂 / 時系列解析 / 日齢構成モデル
Research Abstract

Complicated population dynamics were investigated in systems of seed beetle hosts and parasitoid wasps. We analyzed effects of hosts' spatial distribution and parasitoids' niche separation for the host stages on population dynamics, based on numerical simulations for experimental systems. We founded resource-clumped systems in which vulnerable hosts were located in one large resource patch and resource-sparse one where those hosts were divided into 16 small patches. The resource-clumped condition showed larger mean population sizes with smaller population fluctuations than the resource-sparse condition did, which suggests the former has more higher population persistence than the latter.
Furthermore, numerical simulations for these experimental systems with the three species showed that the larger the parasitoids' niches separate, the larger a region of parametric values for stable coexistence became. Chaotic population behaviors with non-equilibrium dynamics resulted in persistence of the component species in the systems. All these results showed the limiting similarity theory can be supported in non-equilibrium dynamics.

Report

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

    (16 results)

All Other

All Publications (16 results)

  • [Publications] M.Shimada: "Population fluctuation and persistence of 1 host-2 parasitoid systems depending on resource distribution : from parasitizing behavior to population dynamics" Res.Popul.Ecol.41(1). 69-80 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.C.J.Godfray and M.Shimada: "Parasitoids as model organisms for ecologists" Res.Popul.Ecol.41(1). 3-10 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.and Bonsall, M.B.: "Evolutionary and population dynamics of host-parasitoid interactions." Res.Popul.Ecol.41(1). 81-92 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.: "Evolutionary character changes and population responses in an insect host-parasitoid experimental system." Res.Popul.Ecol.40(3). 293-299 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.and Iwasa, Y.: "Evolution of contest competition and its effect on host-parasitoid dynamics." Evol.Ecol.12. 855-870 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Shimada: "Population fluctuation and persistence of 1 host-2 parasitoid systems depending on resource distribution : from parasitizing behavior to population dynamics" Res.popul.Ecol.41 (1). 69-80 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.C.J.Godfray and M.Shimada: "Parasitoids as model organisms for ecologists" Res.popul.Ecol.41 (1). 3-10 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.and Bonsall, M.B.: "Evolutionary and population dynamics of host-parasitoid interactions." Res.popul.Ecol.41 (1). 81-92 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.: "Evolutionary character changes and population responses in an insect host-parasitoid experimental system." Res.popul.Ecol.40 (3). 293-299 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tuda, M.and Iwasa, Y.: "Evolution of contest competition and its effect on host-parasitoid dynamics." Evol.Ecol.12. 855-870 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.C.J.Godfray and M.Shimada: "Parasitoids as model organisms for ecologists" Res.Popul.Ecol.41・1. 5-12 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Shimada: "Population fluctuation and persistence of 1 host-2 parasitoid systems depending on resource distribution : from parasitizing behavior to population dynamics" Res.Popul.Ecol.41・1(印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Brathen,A., Shimada,M. & Stenseth,N.C.: "Parameter identifiability in a detailed mechanistic non-linear population dynamics model." Math.Biosci.15(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tuda,M.: "Character changes and population responses in an insect experimental system." Res.Popul.Ecol.40(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tuda M.and Iwasa Y.: "Evolution of contest competition and its effect on host-parasitoid dynamics." Evol.Ecol.12(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 津田みどり: "シリーズ・ニューバイオフィジックス10 「数理生態学」に収録" (株)共立出版, 69-79 (1997)

    • Related Report
      1997 Annual Research Report

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

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