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Factors that generate interregional variation in the frequency of dioecious trees

Research Project

Project/Area Number 16K07783
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Forest science
Research InstitutionOsaka City University

Principal Investigator

Nanami Satoshi  大阪市立大学, 大学院理学研究科, 准教授 (70326247)

Co-Investigator(Kenkyū-buntansha) 伊東 明  大阪市立大学, 大学院理学研究科, 教授 (40274344)
Project Period (FY) 2016-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords性表現 / 雌雄異株 / 雌雄同株 / 個体群維持機構 / 遺伝的多様性 / 共存 / 森林 / 樹木 / 共存機構 / 生活史 / 鳥類 / 生活史特性 / 開花サイズ / 森林動態 / 花粉散布 / 種子散布
Outline of Final Research Achievements

Dioecious plants are expected to have stronger pollen limitation and narrower seed dispersal range than bisexual plants, making them more difficult to maintain their populations. To compensate for these disadvantages, we demonstrated that dioecious plants are sexually precocious than cosexual plants. Dioecious plants tend to have bird-dispersed seeds, and we searched for forest birds that contribute to seed dispersal using voice data. In addition, we compared the inbreeding coefficients between dioecious and cosexual species of the Lauraceae, and showed that inbreeding was avoided in the former. In Lindera glauca, of which only female plants have been found in Japan, showed little genetic variation among samples from all over Japan, indicating that the population in Japan is a huge clone.

Academic Significance and Societal Importance of the Research Achievements

固着生活を送るにも関わらず、雌雄の機能を個体レベルで分業する雌雄異株植物が、両性植物が優占する中で、いかに個体群を維持しているのか、これはダーウィンも注目した難問である。本研究は、雌雄異株植物の各個体は1つの性の役割に集中投資できるため、両性植物よりも早熟であるという有利性を示した。さらに、異株植物が近親交配を避け、集団の遺伝的多様性を高く維持していることも、個体群の維持に役立っていると考えられた。一方で、ヤマコウバシのように極めて遺伝的多様性が低い集団も見られ、1本の親株だけで種子生産できるという長所の効果が十分に大きければ、集団の遺伝的多様性は必須のものではないことも示された。

Report

(6 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (28 results)

All 2021 2020 2019 2018 2017 Other

All Int'l Joint Research (5 results) Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (19 results) (of which Int'l Joint Research: 4 results) Remarks (1 results)

  • [Int'l Joint Research] サラワク森林局/サラワク森林研究所(マレーシア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Forest Department Sarawak(マレーシア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Center for Tropical Forest Science(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Forest Department Sarawak(マレーシア)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Center for Tropical Forest Science(米国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Genetic Diversity and Structure of Apomictic and Sexually Reproducing Lindera Species (Lauraceae) in Japan2021

    • Author(s)
      Nakamura, M., Nanami, S., Okuno S., Hirota, S.K., Matsuo A., Suyama Y., Tokumoto H., Yoshihara, S., Itoh, A.
    • Journal Title

      Forests

      Volume: 12 Issue: 2 Pages: 227

    • DOI

      10.3390/f12020227

    • NAID

      120006978343

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2019851

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dioecious plants are more precocious than cosexual plants: A comparative study of relative sizes at the onset of sexual reproduction in woody species2017

    • Author(s)
      Itsuki Ohya, Satoshi Nanami, Akira Itoh
    • Journal Title

      Ecology and Evolution

      Volume: 7 Issue: 15 Pages: 5660-5668

    • DOI

      10.1002/ece3.3117

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 春日山原始林において観察記録が途絶えた鳥類の音声による再確認2017

    • Author(s)
      大矢樹, 岡本真帆, 武田紗季, 伊東明, 名波哲
    • Journal Title

      地域自然史と保全

      Volume: 39 Pages: 61-70

    • NAID

      40021289068

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 日本産樹木における液果の反射スペクトルと生育環境との関係2021

    • Author(s)
      上羽亮太朗, 名波哲, 永見侑大, 伊東明
    • Organizer
      日本生態学会第68回全国大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 果実の反射スペクトルの変化に伴う訪鳥数と採食果実数の推移2021

    • Author(s)
      永見侑大, 名波哲, 伊東明
    • Organizer
      日本生態学会第68回全国大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 日本産クロモジ属樹種4種の遺伝的多様性と遺伝構造2020

    • Author(s)
      中村 瑞穂, 名波 哲, 伊東 明, 陶山 佳久, 廣田 峻, 松尾 歩
    • Organizer
      2020年度日本生態学会近畿地区会例会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Comparison of genetic diversity among Lindera species (Lauraceae) with different reproductive systems2020

    • Author(s)
      Mizuho NAKAMURA, Satoshi NANAMI, Akira ITOH, Yoshihisa SUYAMA, Shun HIROTA, Ayumi MATSUO
    • Organizer
      第67回日本生態学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 果実の成熟に伴う鳥類の採食行動の変化2020

    • Author(s)
      永見侑大, 名波晢, 伊東明
    • Organizer
      第67回日本生態学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 雌雄異株樹木における対立遺伝子組成の雌雄株間の違い2019

    • Author(s)
      名波 哲, 永野 惇, 手塚 あゆみ, 伊東 明
    • Organizer
      第66回日本生態学会年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Seed dispersal network between birds and woody plants in the Kasugayama Forest Reserve, a primary evergreen broad-leaved forest, Japan2018

    • Author(s)
      Okamoto M, Ohya I, Tahara D, Itoh A, Nanami S
    • Organizer
      The 8th East Asian Federation of Ecological Societies International Congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Dioecious plants compensate for reproductive disadvantages by precocious flowering2018

    • Author(s)
      Ohya I, Nanami S, Itoh A
    • Organizer
      The 8th East Asian Federation of Ecological Societies International Congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effects of an invasive tree Nageia nagi (Podocarpaceae) on flowering sex ratio and reproductive activity of a dioecious tree Neolitsea aciculata (Lauraceae)2018

    • Author(s)
      Nanami, S., Hideyuki Kawaguchi, H., Akira Itoh, A
    • Organizer
      The 8th East Asian Federation of Ecological Societies International Congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Phylogeny and ecological traits of dioecious trees in a tropical rain forest in Borne2018

    • Author(s)
      Ohya I, Itoh A, Nanami S, Tan S, Mohamad MB
    • Organizer
      The 55th Annual Meeting of Association of Tropical Biology and Conservation (ATBC)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 糞から抽出したミトコンドリアDNAの塩基配列による鳥類の種同定2018

    • Author(s)
      田原大督・岡本真帆・大矢樹・伊東明・名波哲
    • Organizer
      日本生態学会第65回全国大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 春日山原始林における鳥類の種子散布ネットワーク2018

    • Author(s)
      岡本真帆・大矢樹・田原大督・伊東明・名波哲
    • Organizer
      日本生態学会第65回全国大会
    • Related Report
      2017 Research-status Report
  • [Presentation] ボルネオ熱帯雨林における雌雄異株樹種の系統関係と生態特性2018

    • Author(s)
      大矢樹・伊東明・ 名波哲・ Davies, Stuart・Sylvester Tan・B. Mohamad Mohizah
    • Organizer
      日本生態学会第65回全国大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 雌雄異株植物ナギにおける当年生実生の性比の母樹間の比較2018

    • Author(s)
      松澤和史・名波哲・大田明咲奈・神丸千明・永野惇・手塚あゆみ・伊東明
    • Organizer
      日本生態学会第65回全国大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 雌雄異株樹木は雌雄同株樹木より早熟か?2017

    • Author(s)
      大矢樹, 名波哲, 伊東明(大阪市立大学・院理)
    • Organizer
      日本生態学会第64回全国大会
    • Place of Presentation
      東京都新宿区西早稲田1-6-1 早稲田大学早稲田キャンパス
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 奈良県春日山原始林における植生タイプ間での鳥類の種組成と種多様性の違い2017

    • Author(s)
      岡本真帆(大阪市立大学・理), 大矢樹(大阪市立大学・院理), 武田紗季(大阪市立大学・理), 伊東明(大阪市立大学・院理), 名波哲(大阪市立大学・院理)
    • Organizer
      日本生態学会第64回全国大会
    • Place of Presentation
      東京都新宿区西早稲田1-6-1 早稲田大学早稲田キャンパス
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 春日山原始林における植生間の鳥類多様性の比較と植生タイプとの関係2017

    • Author(s)
      岡本 真帆・大矢 樹・武田 紗季・伊東 明・名波 哲
    • Organizer
      日本生態学会平成29年度近畿地区会例会
    • Related Report
      2017 Research-status Report
  • [Presentation] ボルネオ島熱帯雨林樹木の性表現と生態特性の相関2017

    • Author(s)
      大矢樹・伊東明・名波哲・Stuart Davies・Sylvester Tan・Mohizah B. Mohamad
    • Organizer
      第27回日本熱帯生態学会年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 奈良県春日山原始林における鳥類群集の多様性と植生タイプとの関係2017

    • Author(s)
      岡本 真帆・大矢 樹・武田 紗季・伊東 明・名波 哲
    • Organizer
      日本鳥学会2017年度大会
    • Related Report
      2017 Research-status Report
  • [Remarks] ヤマコウバシがたった1本の雌株から生じた巨大なクローンであることを発見!

    • URL

      https://www.osaka-cu.ac.jp/ja/news/2020/210226-1

    • Related Report
      2020 Annual Research Report

URL: 

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

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