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What kind of artificial light does the nocturnal amphibian Hynobius tokyoensis need to be exposed to in order for it to be adversely affected?

Research Project

Project/Area Number 20K04761
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22060:Environmental systems for civil engineering-related
Research InstitutionKisarazu National College of Technology

Principal Investigator

Yutani Kentaro  木更津工業高等専門学校, 環境都市工学科, 准教授 (00344953)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywordsトウキョウサンショウウオ / 光害 / 夜間行動 / 生態系保全
Outline of Research at the Start

トウキョウサンショウウオは,開発等の影響により数を減らしており,その保全は急務である.近年,夜間の人工光が野生生物に与える悪影響(光害)が注目されており,夜行性の野生生物は人工光により活動に悪影響を受けることが知られてきた.そこで本研究は,夜行性であるトウキョウサンショウウオを対象に,どのような波長のどの程度の強さの人工光が,その日々の活動に対して悪影響を及ぼすのか明らかにすることを目的とする.

Outline of Final Research Achievements

The purpose of this study was to clarify the effects of color and illuminance of LED lighting on the nocturnal activity of a rare nocturnal species, the Tokyo salamander (Hynobius tokyoensis). We used white, blue, green, yellow, and red LEDs in the experiment, and compared the nocturnal activity of this species at 1 and 10 lux with that of when the lights were off. The results of the experiment indicated that the activity of this species was suppressed at higher illuminance, regardless of the light color. The results of this study suggest that the magnitude of the suppression of the nocturnal activity of this species at the same illuminance is white ≒ red > green ≒ blue > yellow.

Academic Significance and Societal Importance of the Research Achievements

本研究の結果から,黄色LEDを用いた照明は本種への影響を最小化することが可能になると考えられる.また,本種の自然生息地では,ゲンジボタルの生息も確認されているものの,黄色光であればゲンジボタルの成虫および幼虫に対して影響を小さくでき,同時に2種類の生物に対して配慮が可能である.しかし,全ての野生生物に対してLED単色光の影響が明らかとなっているわけではなく,特定の生物への影響が小さくなっても,他の生物への影響が大きくなる可能性も否定できず,注意が必要であると考える.

Report

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

    (4 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (1 results)

  • [Journal Article] Effects of artificial night LED lighting on the nocturnal behavior of <i>Hynobius tokyoensis</i>.2023

    • Author(s)
      湯谷 賢太郎,佐野 尚毅
    • Journal Title

      Ecology and Civil Engineering

      Volume: 25 Issue: 2 Pages: 63-70

    • DOI

      10.3825/ece.22-00003

    • ISSN
      1344-3755, 1882-5974
    • Year and Date
      2023-03-31
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] EFFECTS OF LED LIGHTING COLORS AND ILLUMINANCE ON THE NOCTURNAL ACTIVITY OF <i>HYNOBIUS TOKYOENSIS</i>2022

    • Author(s)
      湯谷 賢太郎, 三森 彩音, 堀切 もも子
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

      Volume: 78 Issue: 7 Pages: III_425-III_430

    • DOI

      10.2208/jscejer.78.7_III_425

    • ISSN
      2185-6648
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] トウキョウサンショウウオの基礎代謝に対する温度環境及び体重との影響2021

    • Author(s)
      湯谷賢太郎・桒田将司
    • Journal Title

      爬虫両棲類学会報

      Volume: 2021 (2) Pages: 173-178

    • Related Report
      2021 Research-status Report
  • [Presentation] LED照明の色の違いが夜行性のトウキョウサンショウウオの活動量に及ぼす影響2020

    • Author(s)
      堀切もも子,湯谷賢太郎
    • Organizer
      応用生態工学会2020年度Web研究発表会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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