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A comparative study on deep sublittoral marine algal floras between the Boso Peninsula and Ogasawara Islands, Japan

Research Project

Project/Area Number 19K06830
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45030:Biodiversity and systematics-related
Research InstitutionNational Museum of Nature and Science, Tokyo

Principal Investigator

Kitayama Taiju  独立行政法人国立科学博物館, 植物研究部, 研究主幹 (20270407)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords小笠原 / 海藻相 / 植物地理学 / 藻類 / 深所性海藻 / 房総半島 / 小笠原諸島
Outline of Research at the Start

自然な海岸が残され世界自然遺産にも登録された小笠原諸島において深所性海藻相を解明する。これまで小笠原諸島の海藻相は南西諸島と同じ亜熱帯性海藻相(第Ⅲ区)に属すると考えられてきたが、親潮寒流や黒潮暖流などの影響を受けていないため、日本列島側とは異なる海藻相が成立していることが予想される。とくに40m以深の深所において、浅所とは異なる原理で海藻相が形成されている可能性がある。そこで、6番目の新海藻相区を検討するための調査を現地と標本室の両面から行うとともに、日本列島側のモデルとして黒潮の影響を受けている房総半島において同様の採集調査を実施し、両海域の深所性海藻相を比較研究する。

Outline of Final Research Achievements

In order to uncover the peculiarity of the marine algal flora of Ogasawara Islands, Japan, investigations of mesophotic zones were carried out in both Chichijima Island, Ogasawara Islands and Ohara, the Boso Peninsula, resulted in collection of ca. 20 species respectively. Most of the species from Ohara are typically distributed in the Pacific coasts of Japan, though most of the mesophotic algal species has no record from the Japanese Archipelago, including a mesophotic green alga, Codium arenicola. In addition, a brown alga, Stypopodium cf. flabelliforme was collected from a shallow water of Chichijima Island. These suggested that marine algal flora of Ogasawara Islands is isolated from the ones of the Japanese Archipelago; the establishment of a new geographical district is required for the marine algal flora of Ogasawara Islands.

Academic Significance and Societal Importance of the Research Achievements

小笠原諸島の海藻相を浅所のみならず深所で調査し、日本列島側と比較することにより海藻の植物地理学的な進展に貢献した。従来海流と関連付けて議論されてきた日本海藻相区分において南西諸島とともに第III区に分類されていた小笠原の海藻相が日本列島の5つの区のいずれにも収まらず、第VI区の新設が必要であるほど異なることが解明された。世界自然遺産にも登録されている小笠原諸島のさらなる保全にも新たな意義をもたらすものと思われる。

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

    (9 results)

All 2024 2022 2021 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (2 results) Remarks (3 results)

  • [Journal Article] Morphology of <i>Stypopodium</i> cf. <i>flabelliforme</i> Weber Bosse (Phaeophyceae, Ochrophyta) Collected from the Ogasawara Islands, Japan2022

    • Author(s)
      Taiju Kitayama
    • Journal Title

      Bulletin of the National Museum of Nature and Science. Series B, Botany

      Volume: 48 Issue: 4 Pages: 101-107

    • DOI

      10.50826/bnmnsbot.48.4_101

    • ISSN
      1881-9060, 2434-0936
    • Year and Date
      2022-11-22
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Morphology of Codium arenicola M.E.Chacana & P.C.Silva (Codiaceae, Ulvophyceae) from the Ogasawara Islands, Japan2021

    • Author(s)
      Kitayama, T.
    • Journal Title

      Bulletin of the National Museum of Nature and Science, Series B.

      Volume: 47 Issue: 1 Pages: 27-35

    • DOI

      10.1080/09670262.2020.1753815

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Morphology and molecular phylogeny of Umbraulva spp. (Ulvales, Ulvophyceae), and proposal of Ryuguphycus gen. nov. and R. kuaweuweu comb. nov.2020

    • Author(s)
      Kawai, H., T. Hanyuda, I. Mine, S. Takaichi, R. Terada and T. Kitayama
    • Journal Title

      European Journal of Phycology

      Volume: 56 Pages: 1-11

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] First record of Lychaete bainesii (F.Mueller et Harvey ex Harvey) M.J. Wynne (Cladophoraceae, Ulvophyceae) from Japan.2019

    • Author(s)
      Kitayama, T.
    • Journal Title

      Bulletin of the National Museum of Nature and Science, Series B.

      Volume: 45 Pages: 131-136

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 小笠原諸島父島で食用にされている海藻「ハバノリ」(褐藻綱カヤモノリ目)について2024

    • Author(s)
      北山太樹・鈴木雅大
    • Organizer
      日本水産学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 父島産褐藻ジガミグサ属について2022

    • Author(s)
      北山太樹
    • Organizer
      日本藻類学会
    • Related Report
      2021 Research-status Report
  • [Remarks] 研究室コラム:小笠原で食べられている「ハバノリ」の正体

    • URL

      https://www.kahaku.go.jp/column/index.php?month=202401

    • Related Report
      2023 Annual Research Report
  • [Remarks] 翡翠色の海藻

    • URL

      https://www.kahaku.go.jp/column/index.php?month=202301

    • Related Report
      2022 Research-status Report
  • [Remarks] 私の研究-国立科学博物館の研究者紹介-「小笠原諸島海藻相の研究」

    • URL

      https://www.kahaku.go.jp/research/researcher/my_research/botany/kitayama/index_vol4.html

    • Related Report
      2019 Research-status Report

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

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