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Community dynamics in a heterogeneous environment. And subsidized effects by dispersal

Research Project

Project/Area Number 13640634
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionOSAKA WOMEN' S UNIVERSITY

Principal Investigator

NAMBA Toshiyuki  Osaka Women's University Department of Environmental Sciences, Professor, 理学部, 教授 (30146956)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsSubsidized effect / Dispersal / Apparent competition / Exploitative competition / Lotka-Volterra model / Trade-off / Food chain / Source-sink / 群集 / 共存 / source-sink / 移動・分散 / 競争 / 食物連鎖 / 異所性入力 / トップダウン / ボトムアップ
Research Abstract

We examined whether regional persistence of locally impermanent communities can be possible by dispersal of constituent populations in a heterogeneous environment with qualitatively different habitats. For two consumers sharing a common resource with saturating functional responses, coexistence is realized when the dispersal rate of the superior local competitor exceeds that of the inferior. If the habitats differ in produativity, there appear population flows from the more productive habitat to the less productive and they create the source-sink structure. Thus, compettion is released in the more productive and population oscillations of the two consumers in the two consumers in the two habitats are synchronous, the coexistence is not due to the spatial asynchrony observed in many spatial models.
We have similar results for two prey sharing a commoc predator and exhibiting apparent competition. Therefore, if the dispersal is diffusive and there appear no empty habitats, the same mechanism can allow regional coexistence irrespective of whether competiton occurs directly or indirectly
In three-trophic-level food chains, movement of populations in a higher trophic level causes top-down effects in sterile habitats. On the other hand, movement of populations in a lower trophic level generates bottom-up effects and promotes persistence of populations in higher trophic levels. Thus, spatial heterogeneity of habitats and movements of resoueces and organisms may contribute to lengthen the food chains

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 難波 利幸: "食物網とカオス:雑食は少数自由度系と大自由度系を結ぶ鍵になるか?"物性研究. 77-3. 524-528 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 難波 利幸: "生物間相互作用と外来種の侵入可能性"日本生態学会関東地区会会報. 50. 4-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Toshiyuki Namba: "Food webs and chaos: Can omnivory play a key role to connect a-few-degree-of-freedom systems to many-degree-of-freedom systems?"Bussei Kennkyu. 77-3. 524-528 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Toshiyuki Namba: "Biological interactions and invasibility by alien species. (in Japanese)"Nihon Seitaigakkai Kantou-Chikukai Kaihou. 50. 4-10 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 難波 利幸: "生物間相互作用と外来種の侵入可能性"日本生態学会関東地区会会報. 50. 4-10 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 難波 利幸: "食物網とカオス:雑食は少数自由度系と大自由度系を結ぶ鍵になるか?"物性研究. 77・3. 524-528 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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