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Structure and viability of a finless porpoise population off Kujukuri- Kashima Nada

Research Project

Project/Area Number 15K07541
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Aquatic bioproduction science
Research InstitutionThe University of Tokyo

Principal Investigator

Shirakihara Kunio  東京大学, 大気海洋研究所, 客員教授 (90196618)

Co-Investigator(Renkei-kenkyūsha) SHIRAKIHARA miki  
Research Collaborator NAKAHARA fumio  
SHINOHARA masanori  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2018: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
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)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsスナメリ / 出産期 / 出生率 / 個体群存続可能性 / 出世率 / 個体群構造 / 出産率 / 体長推定
Outline of Final Research Achievements

Population viability for finless porpoises off Kujukuri - Kashima Nada in Japan was evaluated. A birth rate estimate in one year, which was given as the maximum of the ratio of 0-year calves to all the members within the year, did not exceed 10% for the four years. We were not sure whether the population has the birth rate high enough to assure population recovery because of a possible underestimate of the birth rate. For example, turbidity observed especially near Tone River were likely to cause lower detectability of 0-year calves. Parturition in these waters was estimated to start in March and have its peak from May to July.

Academic Significance and Societal Importance of the Research Achievements

沿岸性鯨類スナメリは国際自然保護連合により絶滅危惧種に指定されている.東日本太平洋側に分布する本種の個体群は東日本大震災の後に個体数の減少が指摘されている.さらに本個体群は少なくとも2つの個体群に分割すべきとの見解が示されている.本研究は,九十九里~鹿島灘個体群の存続可能性を新生子割合の把握に焦点をあてた調査から検討しており,スナメリの保全を直視している.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (6 results)

All 2018 2017 2016 2015

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Abundance decline in the narrow-ridged finless porpoise population off the Pacific coast of eastern Japan2018

    • Author(s)
      Kunio Shirakihara, Fumio Nakahara, Masanori Shinohara, Miki Shirakihara,Kazuhiko Hiramatsu,Takahiro Irie
    • Journal Title

      Population Ecology

      Volume: 印刷中 Issue: 3 Pages: 325-332

    • DOI

      10.1002/1438-390x.12003

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Habitat use by Indo-Pacific bottlenose dolphins (Tursiops aduncus) in Amakusa, Japan2017

    • Author(s)
      Inoue K, Y. Terashima, M. Shirakihara, K. Shirakihara
    • Journal Title

      Aquatic Mammals

      Volume: 43 Issue: 2 Pages: 127-138

    • DOI

      10.1578/am.43.2.2017.127

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ecosystem dynamics in Tokyo Bay with a focus on high trophic levels using Ecopath with Ecosim2017

    • Author(s)
      Sakamoto A, K. Shirakihara
    • Journal Title

      J Mar Sci Technol

      Volume: 22 Issue: 1 Pages: 1-10

    • DOI

      10.1007/s00773-016-0388-8

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of bycatch on the population viability of the narrow-ridged finless porpoises in Ariake Sound and Tachibana Bay, Japan2015

    • Author(s)
      Hashimoto M., Shirakihara K. and Shirakihara M.
    • Journal Title

      Endangered Species Research

      Volume: 27巻 Issue: 1 Pages: 87-94

    • DOI

      10.3354/esr00658

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] スナメリの出生率と親子連れ利用海域の評価2016

    • Author(s)
      白木原国雄・中原史生・篠原正典・白木原美紀
    • Organizer
      日本水産学会
    • Place of Presentation
      東京海洋大学(東京都港区)
    • Year and Date
      2016-03-27
    • Related Report
      2015 Research-status Report
  • [Presentation] A Versatile Method of Risk Evaluation Based on the Future Predictions for the Various Narrowridged Finless Porpoise Populations2015

    • Author(s)
      Hashimoto M, Shirakihara K
    • Organizer
      IWMC Vth International Wildlife Management Conference
    • Place of Presentation
      札幌コンベンションセンター(北海道札幌市)
    • Year and Date
      2015-07-26
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-03-30  

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