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Ecological, physiological, and behavioral aspects of marine fish speciation

Research Project

Project/Area Number 19K16217
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 45030:Biodiversity and systematics-related
Research InstitutionKitasato University (2023)
Tokai University (2019-2022)

Principal Investigator

Muto Nozomu  北里大学, 海洋生命科学部, 講師 (50724267)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords生殖隔離 / 種分化 / ゲノム / 耳石 / 安定同位体 / 酸素同位体比 / メバル属 / 交雑 / 生活史 / 生態 / MIG-seq / 繁殖期 / 地理的変異 / 鉛直分布 / 繁殖行動
Outline of Research at the Start

生物の集団間に,生理・生態・行動の違いなどの要因にもとづく生殖隔離が成立することにより,新種が誕生する.この種分化過程で,どの要因がどれくらい生殖隔離に寄与するか?それらの要因を進化させるものはなにか?こうした問いを追究する研究が様々な生物群で行われ,生物学の重要課題である「種はいかにして分化するか」に対する一定の回答を提示してきた.しかし,海水魚を対象とした研究は極めて少ない.本研究は,種分化の途上にある海水魚「キツネメバル」と「タヌキメバル」の生理・生態・行動的差異を分析し,両種の交配を何がどの程度妨げているか明らかにする.また,それらの隔離要因が進化した背景を遺伝解析もまじえて推測する.

Outline of Final Research Achievements

We aimed to elucidate isolating mechanisms underlying marine fish speciation by using the genus Sebastes as a model. We demonstrated that bathymetric habitat segregation contributes to the incomplete isolation between two closely related Sebastes species. We also observed genetic incompatibility between more distantly related species, suggesting that various isolating mechanisms operate at different points along this genus's speciation continuum. Finally, our results suggest that hybridization has played a significant role in the diversification of the group, possibly leading to the formation of distinct species.

Academic Significance and Societal Importance of the Research Achievements

本研究は,海水魚の生物多様性が創出・維持されるしくみの一端を解明した.とりわけ,近縁種間の種の境界が生態的差異によって維持されているとの結果は,人為的要因による気候変動が海洋生物の生息環境を大きく改変しつつある中で重要な意味をもつ.環境の改変が種の多様性の喪失にもつながりうることを示唆するからである.

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2023 2022 2021

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

  • [Journal Article] Genetic architectures of postmating isolation and morphology of two highly diverged rockfishes (genus<i>Sebastes</i>)2023

    • Author(s)
      Muto Nozomu、Kawasaki Takuma、Kakioka Ryo、Nagano Atsushi J、Shimizu Yuta、Inose Shu、Shimizu Yohei、Takahashi Hiroshi
    • Journal Title

      Journal of Heredity

      Volume: 114 Issue: 3 Pages: 231-245

    • DOI

      10.1093/jhered/esad007

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Allopatric origin, secondary contact and subsequent isolation of sympatric rockfishes (Sebastidae: <i>Sebastes</i>) in the north-western Pacific2022

    • Author(s)
      Muto Nozomu、Kai Yoshiaki
    • Journal Title

      Biological Journal of the Linnean Society

      Volume: 138 Issue: 1 Pages: 37-50

    • DOI

      10.1093/biolinnean/blac135

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] GENETIC AND ENVIRONMENTAL SEX DETERMINATION IN A ROCKFISH Sebastes vulpes ― A PRELIMINARY REPORT2023

    • Author(s)
      Nozomu Muto, Takeshi Moritani
    • Organizer
      7th International Conference for Fisheries and Aquatic Sciences
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cause and consequence of hybridization in marine fishes: cases of two species complex in the western Pacific2023

    • Author(s)
      Nozomu Muto
    • Organizer
      Guest Lecture Program of Universitas Brawijaya
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ヤナギノマイとガヤモドキは地理的隔離と二次的接触を経て分化した2022

    • Author(s)
      武藤望生,甲斐嘉晃
    • Organizer
      日本魚類学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] メバル属魚類の接合後隔離と形態分化にかかわる遺伝領域の探索2021

    • Author(s)
      武藤望生, 柿岡諒, 永野惇, 坪井健人, 清水 祐大, 猪瀬周, 清水洋平, 川崎琢真, 高橋洋
    • Organizer
      2021 年度 日本魚類学会年会
    • Related Report
      2021 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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