• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Reproductive system of deep-sea cephalopods

Research Project

Project/Area Number 21K06333
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45040:Ecology and environment-related
Research InstitutionShimane University

Principal Investigator

Hiroashi Noritaka  島根大学, 学術研究院農生命科学系, 教授 (90376997)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords深海生物 / 繁殖様式 / 乱婚 / 父性解析 / ホタルイカ / ホタルイカモドキ / オペレーショナル性比 / 頭足類 / 繁殖行動 / 繁殖戦略 / 交尾後性選択 / 精子競争 / ダイオウイカ / 繁殖戦術
Outline of Research at the Start

本研究では、ホタルイカの単婚発見を契機に、これまで手つかずであった深海性イカ類の繁殖様式を明らかにし、深海という特殊な環境またはホタルイカ独自の生活史形質が単婚進化と如何に関連するのかを明らかにする。さらに申請者が行ったこれまでの研究経過から単婚-乱婚の選択を決める環境要因や生理的変化を究明するとともに頭足類で初めてとなる性決定様式の解明のための性染色体の存在を証明する。

Outline of Final Research Achievements

ed the reproductive patterns of the firefly squid, Anguilla japonica, a close relative of the firefly squid, Anguilla japonica. The firefly squid, in Toyama Bay has a breeding season from early summer to autumn, and the proportion of males increased from October onward. Microsatellite markers were developed to examine the paternity of sperm masses attached to females, which were found to be promiscuous. Furthermore, in the latter half of the breeding season, the sex ratio was skewed toward males, and there was a corresponding diversification in sperm delivery sites.
We found that females of the brown squids have three sperm delivery sites, and that there is a rule of thumb regarding the use of these three sites, with the buccal membrane always being used for the first time during copulation, and finally the area behind the eyes. In addition, a small number of males were observed to use all three sites.

Academic Significance and Societal Importance of the Research Achievements

海洋生物の多くは繁殖行動が不明である。特に深海生物のそれは観察が極めて困難なためほとんど知見がなかった。本研究を通して、ホタルイカ、ホタルイカモドキ、そしてダイオウイカの繁殖に関する新知見を得ることができたことは、今後自然や地球環境や生物多様性を一般人に理解してもらう時に役立つと期待される。特に水族館のような科学リテラシー、アウトリーチに特化した施設における最新知見の提供は。社会的貢献度の高いものとなっている。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2021

All Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results,  Open Access: 6 results) Book (1 results)

  • [Journal Article] Persistence of a highly monoandrous mating system despite an extremely male-biased operational sex ratio in the firefly squid Watasenia scintillans2023

    • Author(s)
      Alam Md. Nur E.、Hirohashi Noritaka
    • Journal Title

      Marine Biology

      Volume: 170 Issue: 5 Pages: 1-8

    • DOI

      10.1007/s00227-023-04204-5

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multiplicity of sperm receptacles for securing the offspring genetic variability in a pelagic squid2023

    • Author(s)
      Sato Noriyosi、Ono Hiroki、Hirohashi Noritaka、Iwata Yoko
    • Journal Title

      Marine Biology

      Volume: 170 Issue: 4 Pages: 1-9

    • DOI

      10.1007/s00227-023-04194-4

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] All the spermatangia on a female were implanted by single-pair copulation in giant squid Architeuthis dux2021

    • Author(s)
      Riho Murai, Mamiya Shiomi, Masa-aki Yoshida, Satoshi Tomano, Yoko Iwata, Kyoko Sugai, Noritaka Hirohashi
    • Journal Title

      Deep Sea Research Part I: Oceanographic Research Papers

      Volume: 175 Pages: 103585-103585

    • DOI

      10.1016/j.dsr.2021.103585

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Sperm acrosome status before and during fertilization in the Chinese hamster ( <i>Cricetulus griseus</i> ), and observation of oviductal vesicles and globules2021

    • Author(s)
      Tateno Hiroyuki、Tamura‐Nakano Miwa、Kusakabe Hirokazu、Hirohashi Noritaka、Kawano Natsuko、Yanagimachi Ryuzo
    • Journal Title

      Molecular Reproduction and Development

      Volume: 88 Issue: 12 Pages: 793-804

    • DOI

      10.1002/mrd.23547

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid2021

    • Author(s)
      Noritaka Hirohashi, Noriyosi Sato, Yoko Iwata, Satoshi Tomano, Md Nur E Alam, Lgia Haselmann Apostlico, Jos; Eduardo Amoroso Rodriguez Marian
    • Journal Title

      Plos One

      Volume: 16 Issue: 8 Pages: 0256745-0256745

    • DOI

      10.1371/journal.pone.0256745

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid2021

    • Author(s)
      Iwata Yoko、Sato Noriyosi、Hirohashi Noritaka、Watanabe Yoshiro、Sauer Warwick H. H.、Shaw Paul W.
    • Journal Title

      Journal of Evolutionary Biology

      Volume: 34 Issue: 9 Pages: 1352-1361

    • DOI

      10.1111/jeb.13894

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of sperm surface oligosaccharides in sperm passage into sperm storage tubules in Japanese quail (Coturnix japonica).2021

    • Author(s)
      Matsuzaki M, Hirohashi N, Mizushima S, Sasanami T.
    • Journal Title

      Animal Reproduction Science

      Volume: 227 Pages: 106731-106731

    • DOI

      10.1016/j.anireprosci.2021.106731

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Longer and faster sperm exhibit better fertilization success in Japanese quail.2021

    • Author(s)
      Matsuzaki M, Hirohashi N, Tsudzuki M, Haqani MI, Maeda T, Mizushima S, Sasanami T.
    • Journal Title

      Poultry Science

      Volume: 100 Issue: 4 Pages: 100980-100980

    • DOI

      10.1016/j.psj.2021.01.003

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Book] 海洋と生物2021

    • Author(s)
      岩田容子、広橋教貴
    • Total Pages
      7
    • Publisher
      生物研究社
    • ISBN
      9784909119339
    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi