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2007 Fiscal Year Final Research Report Summary

Foraging and reproduction based on memory and learning in flys : foraging trajectory and chaotic attractor shift

Research Project

Project/Area Number 18570012
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Ecology/Environment
Research InstitutionThe University of Tokyo

Principal Investigator

SHIMADA Masakazu  The University of Tokyo, Graduate School of Arts and Science, Professor (40178950)

Project Period (FY) 2006 – 2007
KeywordsOptimal foraging theory / Memory / Learning / Drosophila melanofaster / Walking trajectory / Random walking / Levy-flight walking / Autoregression model
Research Abstract

Optimal foraging theory has a premise that organisms behave rationally estimating current and future profits completely and calculates the foraging strategy applying the optimal algorism that are far from the realism. Therefore, behavioral ecologists would like to re-build the foraging theory, taking into account the realistic constrain on memory and learning ability of actual organisms. In the present research project, we conducted the behavior experiment on walking trajectory in the fruit fly, Drosophila melanogasuter. We expected to reveal the ultimate factor (e.g., biological fitness) in the foraging efficiency, analyzing the pattern in the diet-searching trajectory of D. melanogaster. Firstly, we discovered that a walking bout follows estimation of the mixed model that are in between "power distribution" based on Levy-flight walking and "exponential distribution" inferred from random walking, and that the walking showed a directionally-biased tendency. This results can be explained as combined behaviors by natural selection which promoted Levy-flight walking increasing the foraging efficiency and by embodiment constraint on a realistic organism. Furthermore, conducting the time-series analysis based on locally stationary auto-regression model, we showed that the movement speed was kept for a certain period with maintaining the same auto-regression model and that the conversion turn degree was not, suggesting a natural selection on the movement speed. Thus, the present project that was ordered by physical and statistical methods analyzed decision-making processes, and it showed unique results beyond the current behavioral ecology.

  • Research Products

    (16 results)

All 2008 2007 2006 Other

All Journal Article (5 results) (of which Peer Reviewed: 3 results) Presentation (10 results) Remarks (1 results)

  • [Journal Article] Competitive exclusion between contest and scramble strategists in Callosobruchus seed-beetle modeling2008

    • Author(s)
      Yumiko Ishii and Masakazu Shimada
    • Journal Title

      Population Ecology 50

      Pages: 197-205

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Adaptation or the effect of global warming? -Numerical simulations for the rapid voltinism change in an alien lepidopteran pest.2008

    • Author(s)
      Yamanaka T., Tatsuki S. and Shimada M.
    • Journal Title

      Journal of Animal Ecology 77

      Pages: 585-596

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Optimal sex ratio schedules in a dynamic game: the effect of competitive asymmetry by male emergence order.2008

    • Author(s)
      Abe J., Kamimura Y. and Shimada M.
    • Journal Title

      Behavioral Ecology 19(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Adaptation or the effect of global warming? -Numerical simulations for the rapid voltinism change in an alien lepidopteran pest2008

    • Author(s)
      Yamanaka T., Tatsuki S. and Shimada M.
    • Journal Title

      Journal of Animal Ecology 77

      Pages: 585-596

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Optimal sex ratio schedules in a dynamic game : the effect of competitive asymmetry by male emergence order2008

    • Author(s)
      Abe J., Kamimura Y. and Shimada M
    • Journal Title

      Behavioral Ecology 19

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 記憶力が適応戦略に与える影響:Levy or not Levy, that is a question2008

    • Author(s)
      堀部直人・池上高志・嶋田正和
    • Organizer
      日本生態学会第55回大会
    • Place of Presentation
      福岡
    • Year and Date
      20080300
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Effects of memory on adaptive strategy : Levy or not Levy, that is the question2008

    • Author(s)
      Horibe N. and M. Shimada
    • Organizer
      The 55th Annual Meeting of the Ecological Society of Japan
    • Place of Presentation
      Fukuoka
    • Year and Date
      20080300
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 局所情報が生成する理想自由分布:ニューラルネットを用いた採餌行動2007

    • Author(s)
      堀部直人、嶋田正和
    • Organizer
      日本生態学会第54回大会
    • Place of Presentation
      松山
    • Year and Date
      20070300
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Ideal free distribution induced by local information : Neural-Network model of foraging behavior2007

    • Author(s)
      Horibe N. and M. Shimada
    • Organizer
      The 54th Annual Meeting of the Ecological Society of Japan
    • Place of Presentation
      Matsuyama
    • Year and Date
      20070300
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Analysis of foraging path using real time tracking system2006

    • Author(s)
      N. Horibe, T. Ikegami and M. Shimada
    • Organizer
      Japanese-Korean Joint Meeting for Mathematical Biology
    • Place of Presentation
      福岡
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] ハエの記憶と学習による適応戦略 -歩行軌跡の時系列解析-2006

    • Author(s)
      高橋久尚、堀部直人、池上高志、嶋田正和
    • Organizer
      2006年度統計関連学会連合大会
    • Place of Presentation
      仙台
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Analysis of foraging path using real time tracking system2006

    • Author(s)
      N. Horibe, T. Ikegami and M. Shimada
    • Organizer
      Japanese-Korean Joint Meeting for Mathematical Biology
    • Place of Presentation
      Fukuoka
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Memoly and learning dependent adaptive strategy of Musca Domestica. -Time series analysis of foraging path2006

    • Author(s)
      Takahashi H., N. Horibe, T. Ikegami and M. Shimada
    • Organizer
      The 2006 Japanese Joint Statistical Meeting
    • Place of Presentation
      Sendai
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] ニューラルネットによる採餌行動の進化モァル2006

    • Author(s)
      堀部直人、嶋田正和
    • Organizer
      日本進化学会2006年大会
    • Place of Presentation
      東京
    • Year and Date
      20060800
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Neural-Network model of Evolution of foraging behavior2006

    • Author(s)
      Horibe N. and M. Shimada
    • Organizer
      Society of Evolutionary Studies
    • Place of Presentation
      Tokyo
    • Year and Date
      20060800
    • Description
      「研究成果報告書概要(欧文)」より
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://park.itc.u-tokyo.ac.jp/shimada-lab/index.html

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Published: 2010-02-04  

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