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STUDY ON DISRUPTIVE SELECTION CAUSEING SPECIATION IN COMPLEX PREDATOR-PREY SYSTEMS

Research Project

Project/Area Number 13440227
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

SAITO Yutaka  Hokkaido Univ., Graduate School of Agriculture, Professor, 大学院・農学研究科, 教授 (20142698)

Co-Investigator(Kenkyū-buntansha) HASEGAWA Eisuke  Hokkaido Univ., Graduate School of Agriculture, Assistant Professor, 大学院・農学研究科, 助手 (40301874)
KUDO Syunichi  Naruto Educational Univ., Associate Professor, 学校教育学部, 助教授 (90284330)
YAMAUCHI Atushi  Kyoto Univ., Center of Ecological Research, Associate Professor, 生態学研究センター, 助教授 (40270904)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 2002: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥10,800,000 (Direct Cost: ¥10,800,000)
KeywordsTETRANYCHIDAE / SOCIALITY / PHYLOGENY / DEFENSE / SPECIATION / SCHIZOTETRANYCHUS CELARIUS / DESRUPTIVE SELECTION / ANTI-PREDATOR / 社会性進出 / 種文化 / 行動 / 系統 / ハダニ / カメムシ / モデル / 社会性
Research Abstract

We studied on the factors which caused complex predator-prey systems in the nature from several behavioral view points. First we analyzed the phylogenies of the target species focused on and revealed that the species concerned are monophyletic. Next the behavioral traits of several prey and predator species under experimental conditions. For example, the function of the large and continuous nests of Schizotetranychus longus Saito was beneficial to cooperative defense through the concentration of many adults over a long period, although the nests are relatively vulnerable to predatory intrusion because of their large sizes. On the other hand, the smaller, scattered nests (with at most ten eggs) constructed repeatedly by a single Schizotetranychus celarius Banks female were solid refuges that can prevent several predator species from intruding. In addition to the above function, we found that once scattered nests have suffered predation, they then function as "dummies" to delude predators. Furthermore, most of them should invade the nests to search for and feed on eggs after nest detection. Namely, we indicated that these scattered void nests increase a predators searching cost (time), then function as "dummies for deluding predators" after suffering predation. Therefore, we could conclude that such predation pressure might operate as a disruptive selection pressure which caused the speciation of the celarius species group. In small beetles and ants, we also revealed several related phenomena and determined the phylogeny of them. These results have been prepared as 13 reports of which 4 reports had been accepted or published. The other 9 are now under submission.
Then, the present results strongly suggest that the predation pressure by multiple predators having various traits sometimes operate as very strong factors which cause the speciation of prey species through disruptive selection.

Report

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

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Yutaka Saito, Takane Sakagami, Ken Sahara: "Differences in diapause attributes between two clinal forms distinguished by male-to-male aggression in a subsocial spider mite, Schizotetranychus miscanthi Saito"Ecological Research. 17. 645-653 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shin-ichi Kudo: "Phenotypic selection and function of reproductive behavior in the subsocial bug Elasmucha putoni (Heteroptera: Acanthosomatidae)"Behavioural Ecology. 13. 742-749 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Atsushi Yamauchi, Yukiko Kamite: "Facultative sexual reproduction under frequency-dependent selection on a single locus"Journal of theoretical Biology. 221(In press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Atsushi Yamauchi: "Factors affecting binary sex evolution with respect to avoidance of vertical transmission of deleterious intracellular parasites"Journal of theoretical Biology. 222(In press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yutaka Saito, Takane Sakagami, Ken Sahara: "Differences in diapause attributes between two clinal forms distigushed by male-to-male aggression in a subsocial spider mite, Schizotetranychus miscanthi Saito"Ecological Research. 17. 645-653 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shin-ichi Kudo: "Phenotypic selection and function of reproductive behavior in the subsocial bug Elasmucha putoni(Heteroptera : Acanthosomatidae)"Behavioural Ecology. 13. 742-749 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Atsushi Yamauchi, Yukihiko Kamite: "Facultative sexual reproduction under frequency-dependent selection on a single locus"Journal of theoretical Biology. 221. in press (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Atsushi Yamauchi: "Factors affecting binary sex evolution with respect to advance of vertical transmission of deleterious intracellular parasites"Journal of theoretical Biology. 222. in press (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yutaka Saito, Takane Sakagami, Ken Sahara: "Differences in diapause attributes between two clinal forms distigushed by male-to-male aggression in a subsocial spider mite, Schizotetranychus miscanthi Saito"Ecological Research. 17. 645-653 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Shin-ichi Kudo: "Phenotypic selection and function of reproductive behavior in the subsocial bug Elasmucha putoni (Heteroptera : Acanthosomatidae)"Behavioural Ecology. 13. 742-749 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Atsushi Yamauchi, Yukiko Kamite: "Facultative sexual reproduction under frequency-dependent selection on a single locus"Journal of theoretical Biology. 221(in press). (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Atsushi Yamauchi: "Factors affecting binary sex evolution with respect to advance of vertical transmission of deleterious intracellular Parasites"Journal of theoretical Biology. 222(in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kudo, S.(工藤慎一): "Phenotypic selection and function of reproductive behavior in the subsocial bug <Elasmucha>___- <putoni>___- (Heteroptera : Acanthosomatidae)"Behavioral Ecology. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 齋藤 裕: "「ダニの生物学」青木淳一編(分担執筆「ダニの社会性」)"東京大学出版会. (2001)

    • Related Report
      2001 Annual Research Report

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

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