Production of Hydroxylamine in the Epilimnion of a Dam Lake

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  • HIKINO Aiko
    Graduate School of Science and Engineering, Shimane University Shimane Prefectural Institute of Public Health and Environmental Science
  • KATO Toshikuni
    Shimane Prefectural Institute of Public Health and Environmental Science stuary Research Center, Shimane University
  • SUGAHARA Shogo
    Graduate School of Natural Science and Technology, Shimane University
  • HAYASHI Shohei
    Faculty of Life and Environmental Science, Shimane University stuary Research Center, Shimane University
  • OHTANI Shuji
    Faculty of Education, Shimane University stuary Research Center, Shimane University
  • SENGA Yukiko
    Faculty of Science, Toho University
  • GODO Toshiyuki
    Shimane Prefectural Institute of Public Health and Environmental Science stuary Research Center, Shimane University
  • EGAWA Michiko
    Graduate School of Natural Science and Technology, Shimane University
  • PARK Ja Yeong
    Graduate School of Natural Science and Technology, Shimane University
  • TANAKA Hidekazu
    Graduate School of Natural Science and Technology, Shimane University
  • SEIKE Yasushi
    stuary Research Center, Shimane University

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  • ダム湖表水層におけるヒドロキシルアミンの生成起源
  • ダムコヒョウスイソウ ニ オケル ヒドロキシルアミン ノ セイセイ キゲン

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Abstract

<p>　In the euphotic layer of a dam lake (reservoir), we discovered a phenomenon that hydroxylamine (NH2OH) accumulates at a high concentration at the same time as the increase in Chl-a, which is an indicator of phytoplankton biomass. Therefore, to investigate the presence or absence of NH2OH production by phytoplankton, we conducted a culture experiment using a single sterile strain of cyanobacteria isolated from the dam lake. Our results confirmed that NH2OH increased with the increase in Chl-a, and the ability of cyanobacteria to produce NH2OH was clarified. This result suggests that NH2OH detected in the euphotic layer during the dominance of cyanobacteria in summer is produced by the cyanobacteria.</p>

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