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Ecological role of marine viruses infecting zooplankton

Research Project

Project/Area Number 20H03057
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionThe University of Tokyo

Principal Investigator

Hirai Junya  東京大学, 大気海洋研究所, 講師 (30762554)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywordsカイアシ類 / ウイルス / 共生ー寄生 / 個体群動態 / 遺伝子発現 / 動物プランクトン / 共生寄生
Outline of Research at the Start

海洋に存在する膨大な数のウイルスは時に水産重要魚種の種苗生産における大量致死の一因となり、人間活動にも大きく関わる。しかし、魚類等の餌として知られる動物プランクトンに感染するウイルスの生態学的意義は明らかにされていない。本研究は新規的な分子生物学的手法を駆使し、ウイルスが動物プランクトンを介してどのように海洋生態系に影響を及ぼすかを明らかにすることを目的とする。

Outline of Final Research Achievements

The interactions between zooplankton and viruses have been overlooked despite their crucial roles in marine ecosystems. In this study, extensive weekly samplings of zooplankton were performed, and interactions between viruses and key copepod Pseudocalanus newmani were investigated. Four novel RNA viruses were detected from the massive transcriptome data. RT-qPCR revealed that all RNA viruses were observed during the low-abundance period of P. newmani. Copepods with high viral loads of a specific virus showed significant physiological changes by transcriptome analysis. These results showed that copepod-virus interactions cannot be neglected to understand the marine ecosystem.

Academic Significance and Societal Importance of the Research Achievements

本研究は海洋におけるウイルスと動物プランクトンの関係性の詳細を調べた初の研究である。複数の解析により主要動物プランクトンであるカイアシ類から新規ウイルスが検出され、動物プランクトンの生態に関わる可能性も示され、得られた結果は学術的に非常に価値が高い。動物プランクトンは海洋の低次から高次生態系をつなぐ重要な役割を果たしており、動物プランクトンの個体群動態の理解は水産重要種の資源量変動とも密接に関わっている。本研究で得られた成果がさらに発展することで、動物プランクトンの個体数変動の理解がさらに進み、将来的には資源量変動を含めた海洋生態系の理解にも貢献可能になると期待される。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (25 results)

All 2023 2022 2021 2020

All Journal Article (13 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 11 results,  Open Access: 8 results) Presentation (12 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Comparisons of genetic population structures of copepods Pseudocalanus spp. in the?Okhotsk Sea: the first record of P. acuspes in coastal waters off Japan2023

    • Author(s)
      Hirai Junya、Katakura Seiji、Nagai Satoshi
    • Journal Title

      Marine Biodiversity

      Volume: 53 Issue: 1 Pages: 12-12

    • DOI

      10.1007/s12526-022-01323-y

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A new species of genus <i>Sapphirina</i> (Copepoda, Cyclopoida) from the Kuroshio Extension region in the western North Pacific Ocean2022

    • Author(s)
      Takahashi Kazutaka、Itoh Hiroshi、Hirai Junya、Tadokoro Kazuaki、Nishiuchi Koh
    • Journal Title

      Plankton and Benthos Research

      Volume: 17 Issue: 4 Pages: 358-368

    • DOI

      10.3800/pbr.17.358

    • ISSN
      1880-8247, 1882-627X
    • Year and Date
      2022-11-30
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] <i>Paracalanus orientalis</i> n. sp. (Copepoda, Calanoida), formerly referred to as <i>P. parvus</i> in Japanese coastal waters2022

    • Author(s)
      Ueda Hiroshi、Itoh Hiroshi、Hirai Junya、Hidaka Kiyotaka
    • Journal Title

      Plankton and Benthos Research

      Volume: 17 Issue: 2 Pages: 221-230

    • DOI

      10.3800/pbr.17.221

    • ISSN
      1880-8247, 1882-627X
    • Year and Date
      2022-05-30
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular and morphological analyses to improve taxonomic classification of<i>Metridia lucens</i>/<i>pacifica</i>in the North Pacific2022

    • Author(s)
      Hirai Junya、Chen Fang、Itoh Hiroshi、Tadokoro Kazuaki、Lemay Matthew A、Hunt Brian P V、Tsuda Atsushi
    • Journal Title

      Journal of Plankton Research

      Volume: 44 Issue: 3 Pages: 454-463

    • DOI

      10.1093/plankt/fbac020

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] RNA Virosphere in a Marine Zooplankton Community in the Subtropical Western North Pacific2022

    • Author(s)
      Junya Hirai, Syun-ichi Urayama, Yoshiro Takaki, Miho Hirai, Keizo Nagasaki, Takuro Nunoura
    • Journal Title

      Microbes and Environments

      Volume: 37 Issue: 5 Pages: n/a

    • DOI

      10.1264/jsme2.ME21066

    • NAID

      130008138832

    • ISSN
      1342-6311, 1347-4405
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Decadal vision in oceanography 2021: New methods and problems2021

    • Author(s)
      Hirai Junya、Miya Masaki、Fujiki Tetsuichi、Kuwano-Yoshida Akira、Otosaka Shigeyoshi、Kaeriyama Hideki、Kako Shin'ichiro、Kataoka Tomoya、Matsuoka Daisuke、Hidaka Mitsuko、Sugiyama Daisuke、Fujio Kojima and
    • Journal Title

      Oceanography in Japan

      Volume: 30 Issue: 5 Pages: 227-253

    • DOI

      10.5928/kaiyou.30.5_227

    • NAID

      130008131958

    • ISSN
      0916-8362, 2186-3105
    • Year and Date
      2021-11-15
    • Related Report
      2021 Annual Research Report
  • [Journal Article] Decadal vision in oceanography 2021: Mid-latitude ocean2021

    • Author(s)
      橋濱史典・纐纈慎也・近藤能子・佐々木克徳・杉本周作・高橋一生・長井健容・西岡純・林田博士・平井淳也
    • Journal Title

      Oceanography in Japan

      Volume: 30 Issue: 5 Pages: 127-154

    • DOI

      10.5928/kaiyou.30.5_127

    • NAID

      130008131961

    • ISSN
      0916-8362, 2186-3105
    • Year and Date
      2021-11-15
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters2021

    • Author(s)
      Kobari Toru、Tokumo Yusuke、Sato Ibuki、Kume Gen、Hirai Junya
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 23265-23265

    • DOI

      10.1038/s41598-021-02083-8

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] DNA/RNA metabarcoding and morphological analysis of epipelagic copepod communities in the Izu Ridge off the southern coast of Japan2021

    • Author(s)
      Hirai Junya、Hidaka Kiyotaka、Nagai Satoshi、Shimizu Yugo
    • Journal Title

      ICES Journal of Marine Science

      Volume: 78 Issue: 9 Pages: 3444-3456

    • DOI

      10.1093/icesjms/fsab064

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan2021

    • Author(s)
      Kume Gen、Shigemura Taichi、Okanishi Masahiro、Hirai Junya、Shiozaki Kazuhiro、Ichinomiya Mutsuo、Komorita Tomohiro、Habano Akimasa、Makino Fumihiro、Kobari Toru
    • Journal Title

      Frontiers in Marine Science

      Volume: 8 Pages: 725227-725227

    • DOI

      10.3389/fmars.2021.725227

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Feeding Ecology of Three Euphausiid Species in the North Pacific Ocean Inferred From 18S V9 Metabarcoding and Stable Isotope Analysis2021

    • Author(s)
      Zhou Fanyu、Hirai Junya、Hamasaki Koji、Horii Sachiko、Tsuda Atsushi
    • Journal Title

      Frontiers in Marine Science

      Volume: 8 Pages: 756067-756067

    • DOI

      10.3389/fmars.2021.756067

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of diversity and community structure of small planktonic copepods in the Kuroshio region off Japan using a metabarcoding approach2021

    • Author(s)
      Hirai J、Yamazaki K、Hidaka K、Nagai S、Shimizu Y、Ichikawa T
    • Journal Title

      Marine Ecology Progress Series

      Volume: 657 Pages: 25-41

    • DOI

      10.3354/meps13539

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Large-scale metabarcoding analysis of epipelagic and mesopelagic copepods in the Pacific2020

    • Author(s)
      Hirai Junya、Tachibana Aiko、Tsuda Atsushi
    • Journal Title

      PLOS ONE

      Volume: 15 Issue: 5 Pages: e0233189-e0233189

    • DOI

      10.1371/journal.pone.0233189

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Characterization of the genetic population structures of three Pseudocalanus species (Copepoda, Calanoida) in the Okhotsk Sea2023

    • Author(s)
      Junya Hirai, Seiji Katakura, Satoshi Nagai
    • Organizer
      The 37th International Symposium on Okhotsk Sea & Polar Oceans 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Interactions between marine viruses and planktonic copepod Pseudocalanus newmani2022

    • Author(s)
      Junya Hirai, Seiji Katakura, Satoshi Nagai
    • Organizer
      MetaZooGene symposium 2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] 海洋動物プランクトンの分子生態学2022

    • Author(s)
      平井惇也
    • Organizer
      日本プランクトン学会若手の会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] メタバーコーディングによる動物プランクトン群集の把握 ―これまでの進展と今後の展望―2022

    • Author(s)
      平井惇也
    • Organizer
      OceanDNAテック2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] オホーツク海における浮遊性カイアシ類Pseudocalanus acuspesの初記録および遺伝的集団構造の近縁種比較2022

    • Author(s)
      平井 惇也, 片倉 靖次, 長井 敏
    • Organizer
      日本海洋学会海洋生物シンポジウム2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] 海洋性動物プランクトンのウイルス研究2022

    • Author(s)
      平井 惇也, 片倉 靖次, 長井 敏
    • Organizer
      第69回 日本生態学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Ecological dynamics of marine copepods and viruses in the Okhotsk Sea2022

    • Author(s)
      Junya Hirai, Seiji Katakura, Satoshi Nagai
    • Organizer
      The 36th International Symposium on the Okhotsk Sea & Polar Oceans 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 分子生物学的手法を用いた動物プランクトンの多様性研究2021

    • Author(s)
      平井惇也
    • Organizer
      日本プランクトン学会シンポジウム「次世代プランクトン研究を開拓する新技術・方法論」
    • Related Report
      2021 Annual Research Report
  • [Presentation] 海洋学会将来構想2021: 新たな手法と問題2021

    • Author(s)
      平井惇也, 宮正樹, 藤木徹一, 吉田聡, 乙坂重嘉, 帰山秀樹, 加古真一郎, 片岡智哉, 松岡大祐, 日高弥子, 杉山大祐, 小嶌不二夫
    • Organizer
      日本海洋学会創;周年記念シンポジウム;日本の海洋学の今とこれから
    • Related Report
      2021 Annual Research Report
  • [Presentation] 浮遊性カイアシ類Pseudocalanus newmaniから検出された2種のウイルスの生態学的挙動2021

    • Author(s)
      平井惇也, 片倉靖次, 長井 敏
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ウイルス存在下におけるカイアシ類Pseudocalanus newmaniの網羅的遺伝子発現解析2021

    • Author(s)
      平井惇也, 片倉靖次, 長井 敏
    • Organizer
      日本ベントス学会;日本プランクトン学会合同大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 動物プランクトンのメタバーコーディング2021

    • Author(s)
      平井惇也
    • Organizer
      OceanDNAテック2021 環境DNA技術はどこまで進むか?
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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