Production of Hydroxylamine in the Epilimnion of a Dam Lake

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...

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Published inJapanese Journal of Limnology (Rikusuigaku Zasshi) Vol. 83; no. 2; pp. 131 - 140
Main Authors HIKINO, Aiko, KATO, Toshikuni, SUGAHARA, Shogo, HAYASHI, Shohei, OHTANI, Shuji, SENGA, Yukiko, GODO, Toshiyuki, EGAWA, Michiko, PARK, Ja Yeong, TANAKA, Hidekazu, SEIKE, Yasushi
Format Journal Article
LanguageEnglish
Japanese
Published The Japanese Society of Limnology 25.05.2022
Subjects
Aseptic culture
Cyanobacteria
Euphotic layer
Hydroxylamine
Nitrogen cycle
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Summary: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.
ISSN:0021-5104
1882-4897
DOI:10.3739/rikusui.83.131