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Dicisiion processes of male emigration in western lowland gorillas: influences of social and physiological factors

Research Project

Project/Area Number 16K07537
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical anthropology
Research InstitutionKagoshima University

Principal Investigator

Fujita Shiho  鹿児島大学, 総合科学域総合教育学系, 准教授 (90416272)

Co-Investigator(Kenkyū-buntansha) 井上 英治  東邦大学, 理学部, 講師 (70527895)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords生活史 / 社会構造 / 性成熟 / 競合 / 内分泌 / ストレス / ゴリラ / 大型類人猿 / ニシローランドゴリラ / 移出 / ガボン共和国 / コルチゾル / 雄間競合 / 人類学 / 霊長類学 / 生態学 / 生理学
Outline of Final Research Achievements

Multi-male groups are rarely observed in western lowland gorillas, and almost all males disperse from their natal groups. To identify the proximate factors triggering male emigration from natal groups, we investigated changes in stress levels with developmental stages in western lowland gorillas at the Moukalaba-Doudou National Park, Gabon. We observed a difference in the cortisol levels among 4 developmental stages; blackbacks had the highest average value. Such an increase in cortisol levels was not observed in females. Therefore, in western lowland gorillas, males may be in more intense competition in a natal group when they reach maturity. The results supported the hypothesis that increased stress levels trigger male natal emigration.

Academic Significance and Societal Importance of the Research Achievements

霊長類の社会構造は多様であり、集団の性構成やその継承性が種によって異なることから、その要因を明らかにすることは人類の社会進化の解明につながると期待される。従来、ゴリラの社会構造の種内変異について、集団内・集団間の採食および繁殖競合、捕食者からの回避、子殺しの防衛など、社会生態学的な説明が行われてきた。しかし、このような社会生態学的な説明は社会構造の機能を示したものであり、集団内の繁殖オス数の違いにつながるオスの生活史戦略の可塑性がどのように生じるかについて調べた報告はない。本研究の成果は、ヒト亜科における社会構造の多様性、とくに種内変異に関してあらたな知見を与えると考えられる。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (21 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results) Presentation (13 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] 熱帯生態学研究所(IRET)/国立科学研究センター (CENAREST)(ガボン)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] 熱帯生態学研究所(IRET)/国立科学研究センター(CENAREST)(ガボン)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] 熱帯生態学研究所(IRET)/国立科学研究センター(CENAREST)(ガボン)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Improving the standards for gut microbiome analysis of fecal samples: insights from the field biology of Japanese macaques on Yakushima Island2018

    • Author(s)
      Hayakawa Takashi、Sawada Akiko、Tanabe Akifumi S.、Fukuda Shinji、Kishida Takushi、Kurihara Yosuke、Matsushima Kei、Liu Jie、Akomo-Okoue Etienne-Francois、Gravena Waleska、Kashima Makoto、Suzuki Mariko、Kadowaki Kohmei、Suzumura Takafumi、Inoue Eiji、Sugiura Hideki、Hanya Goro、Agata Kiyokazu
    • Journal Title

      Primates

      Volume: 59 Issue: 5 Pages: 423-436

    • DOI

      10.1007/s10329-018-0671-x

    • NAID

      40021661058

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reproductive success of two male morphs in a free-ranging population of Bornean orangutans2018

    • Author(s)
      Tajima Tomoyuki、Malim Titol P.、Inoue Eiji
    • Journal Title

      Primates

      Volume: 59 Issue: 2 Pages: 127-133

    • DOI

      10.1007/s10329-017-0648-1

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Identification and molecular characterization of novel primate bocaparvoviruses from wild western lowland gorillas of Moukalaba-Doudou National Park, Gabon2017

    • Author(s)
      Nze-Nkogue Chimene、Horie Masayuki、Fujita Shiho、Inoue Eiji、Akomo-Okoue Etienne-Francois、Ozawa Makoto、Ngomanda Alfred、Yamagiwa Juichi、Tsukiyama-Kohara Kyoko
    • Journal Title

      Infection, Genetics and Evolution

      Volume: 53 Pages: 30-37

    • DOI

      10.1016/j.meegid.2017.05.004

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] DNA分析が明かす大型類人猿の分散パターン2016

    • Author(s)
      井上英治
    • Journal Title

      現代思想

      Volume: 44-22 Pages: 150-158

    • Related Report
      2016 Research-status Report
  • [Presentation] Non-invasive assessment of the health status in wild primates.2019

    • Author(s)
      Shiho Fujita
    • Organizer
      The 11th International Seminar on Biodiversity and Evolution: Coexistence with Wildlife
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Attempt of partial pedigree reconstruction in a wild un-habituated chimpanzee community using faecal samples.2019

    • Author(s)
      Basabose AK, Inoue E, Kamungu S, Yamagiwa J
    • Organizer
      56th Annual meeting of the Association for Tropical Biology and Conservation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 野生ニシローランドゴリラのオスにおけるストレスレベルの評価―ストレスは出自群からの移出を誘発するか―2018

    • Author(s)
      藤田志歩,シメーヌ・ンゼ・ンコグ,井上英治,竹ノ下祐二,坪川桂子
    • Organizer
      第34回日本霊長類学会大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ガボン,ムカラバ‐ドゥドゥ国立公園のニシローランドゴリラにおける,核オスの消失後の社会変動2018

    • Author(s)
      竹ノ下祐二,Etienne Akomo-Okoue,坪川桂子,藤田志歩,Ghislain Wilfried Ebang-Ella,田村大也,Lilian Brice Mangama-Koumba,Patrice Makouloutou,Paul Yannick Bitome-Esso,山極寿一
    • Organizer
      第35回日本霊長類学会大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Life-history strategies in wild male western lowland gorillas (Gorilla gorilla gorilla): does stress trigger emigration from natal group?2018

    • Author(s)
      S. Fujita, C. Nze Nkogue, E. Inoue, Y. Takenoshita
    • Organizer
      XXVII International Primatological Society Congresses
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Loss of a leading silverback male and resulting group dispersion of western lowland gorillas (Gorilla gorilla gorilla) in Moukalaba-Doudou National Park, Gabon2018

    • Author(s)
      Y. Takenoshita, E. F. Akomo-Okou_, K. Tsubokawa, S. Fujita, G. W. Ebang Ella, M. Tamura, L. B. Mangama-Koumba, P. Makouloutou, P. Y. Bitome Esso, J. Yamagiwa
    • Organizer
      XXVII International Primatological Society Congresses
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] アフリカ熱帯林における糞 DNA 分析を用いた偶蹄類 4 種の生息地利用の解析2018

    • Author(s)
      高島佑子, Etienne Akomo-Okoue, 井上英治
    • Organizer
      日本哺乳類学会2018年度大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 野生ニシローランドゴリラのオスにおけるストレスレベルの評価―ストレスは出自群からの移出を誘発するか―2018

    • Author(s)
      藤田志歩, Chimene NZE-NKOGUE, 井上英治, 竹ノ下祐二, 坪川桂子
    • Organizer
      第34回日本霊長類学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Life-history Strategies in Wild Male Western Lowland Gorillas (Gorilla gorilla gorilla): Does Stress Trigger Emigration From Natal Group?2018

    • Author(s)
      Shiho FUJITA, Chimene NZE NKOGUE, Eiji INOUE, Yuji TAKENOSHITA
    • Organizer
      27th Congress of the International Primatological Society
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 野生ニシローランドゴリラの生活史に伴う糞便中コルチゾル濃度の変化2017

    • Author(s)
      野生ニシローランドゴリラの生活史に伴う糞便中コルチゾル濃度の変化
    • Organizer
      第33回日本霊長類学会大会
    • Place of Presentation
      コラッセ福島(福島県・福島市)
    • Year and Date
      2017-07-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 動物園のくらし、野生のくらし~フィールド研究から見えた動物たちの世界~2017

    • Author(s)
      藤田志歩
    • Organizer
      平川動物公園開園45周年記念講演会
    • Place of Presentation
      平川動物公園(鹿児島県・鹿児島市)
    • Year and Date
      2017-03-19
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] 野生ニシローランドゴリラの生活史に伴う糞便中コルチゾル濃度の変化2017

    • Author(s)
      藤田志歩, Chimene NZE-NKOGUE, 井上英治, 竹ノ下祐二
    • Organizer
      第33回日本霊長類学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] タンザニア・マハレの野生チンパンジー社会におけるオスの単独生活の新事例2017

    • Author(s)
      西江仁徳, 花村俊吉, 保坂和彦, 井上英治, 伊藤詞子, 清野未恵子, 郡山尚紀, 中村美知夫, 坂巻哲也,座馬耕一郎
    • Organizer
      第71回日本人類学会
    • Related Report
      2017 Research-status Report
  • [Remarks] アフリカの森でゴリラを追う~フィールドワークのすすめ~

    • URL

      https://www.kagoshima-u.ac.jp/researcher/2018/05/post-26.html

    • Related Report
      2019 Annual Research Report

URL: 

Published: 2016-04-21   Modified: 2022-02-16  

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