Detection of geosmin from Coelosphaerium kuetzingianum separated by a step density gradient medium from suspended materials in water in Lake Shinji, Japan

Godo, Toshiyuki; Ohtani, Shuji; Saki, Yukiko; Ishitobi, Yu

doi:10.1007/s10201-011-0344-6

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…We suggested in our previous study that Coelosphaerium sp. produced the geosmin 11 . On the day of sample collection, musty odour was not noted at the field site, but after the sample was brought back to the laboratory, the odour was slightly noticeable.…”

Section: Resultsmentioning

confidence: 99%

“…We used the scientific name C .kuetzingianum to refer to the specimens of Coelosphaerium in Lake Shinji during the monthly monitoring surveys of phytoplankton 12 and during the study of geosmin-forming species of Coelosphaerium 11 . However, considering the differences in morphological characteristics mentioned above, we will no longer use C .kuetzingianum to refer to these organisms and will limit the identification to the genus level in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Godo et al . 11 separated suspended substances from the lake water using a step density gradient. The number of cells of Coelosphaerium kuetzingianum correlated with the concentration of geosmin in the separated portions of water samples.…”

mentioning

confidence: 99%

“…The scientific name C. kuetzingianum was used to refer to the specimens of Coelosphaerium in Lake Shinji during monthly monitoring of phytoplankton 12 and in a study of geosmin-forming species of Coelosphaerium 11 . However, in the present study, we identified the organism only to the genus level because there are size differences in the colonies and the number of cells per colony between specimens from Europe and Lake Shinji (see taxonomic remarks in the Results section), suggesting that these may be different species.…”

mentioning

confidence: 99%

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Geosmin-producing Species of Coelosphaerium (Synechococcales, Cyanobacteria) in Lake Shinji, Japan

Godo

Saki

Nojiri

et al. 2017

Sci Rep

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In Lake Shinji, Japan, periodic outbreaks of musty odour have occurred since mid-May 2007. Although the substance responsible for the odour was identified as geosmin, the odour-producing organism was unknown. We cultivated an axenic unialgal strain and determined that a species of Coelosphaerium (Synechococcales) was responsible for the production of geosmin in Lake Shinji. Our analysis was conducted using gas chromatography/mass spectrometry to determine the odorous compound. To determine the algae species, it was observed by optical microscopy to describe its morphological characteristics and the polymerase chain reaction was used to characterise the nucleotide sequence of the 16S rRNA gene and the 16S-23S rRNA internal transcribed spacer region. In addition, we explored the relationship between the number of cells of the Coelosphaerium sp. and the concentration of geosmin. In conclusion, geosmin, the cause of the musty odour in Lake Shinji in autumn 2009, was produced by Coelosphaerium sp., and to our knowledge, this is the first report of a geosmin-producing species in the family Coelosphaeriaceae.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Geosmin-producing Species of Coelosphaerium (Synechococcales, Cyanobacteria) in Lake Shinji, Japan

Godo

Saki

Nojiri

et al. 2017

Sci Rep

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“…In Japan, the continuous generation of musty odor has become a problem in Lake Shinji, which is a brackish water area, and in Sanbe Reservoir located in Shimane Prefecture [18,19]. In 2007, when a high concentration of geosmin occurred at Lake Shinji, producers and wholesalers who harvest and sell of the brackish water bivalve (Corbicula Japonica) had difficulty because of the musty odor smell on the bivalve [19,20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rainfall and pH on Musty Odor Produced in the Sanbe Reservoir

Kim

Hayashi

Masuki

et al. 2021

Water

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Harmful cyanobacterial blooms are continuously formed in water systems such as reservoirs and lakes around the world. Geosmin and 2-methylisoborneol (2-MIB) produced by some species of cyanobacteria have caused odor problems in the drinking water of the Sanbe Reservoir in Japan. Field observations were conducted for four years (2015–2019) to investigate the cause of this musty odor. It was found that geosmin was produced by Dolichospermum crassum and Dolichospermum planctonicum (cyanobacteria), and 2-MIB was due to Pseudanabaena sp. and Aphanizomenon cf. flos-aquae (cyanobacteria). Changes in water temperature and pH caused by rainfall were correlated with changes in the concentration of geosmin and 2-MIB. In particular, geosmin and 2-MIB tended to occur under low rainfall conditions. When there was low rainfall, the reservoir changed to an alkaline state because the phytoplankton consumed CO2 for photosynthesis. In an alkaline reservoir, dissolved inorganic carbon mainly existed in the form of bicarbonate (HCO3−). Thus, the results suggest that under such conditions in reservoirs, cyanobacteria grew easily because they could use both CO2 and HCO3− for photosynthesis. Specifically, our study suggests that in order for the musty odor problem in the reservoir to be solved, it is important that the pH of the reservoir be controlled.

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Development of phytoplankton communities and common off-flavors in a biofloc technology system used for the culture of channel catfish (Ictalurus punctatus)

Schrader

Green

Perschbacher

2011

Aquacultural Engineering

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Detection of geosmin from Coelosphaerium kuetzingianum separated by a step density gradient medium from suspended materials in water in Lake Shinji, Japan

Cited by 9 publications

References 22 publications

Geosmin-producing Species of Coelosphaerium (Synechococcales, Cyanobacteria) in Lake Shinji, Japan

Geosmin-producing Species of Coelosphaerium (Synechococcales, Cyanobacteria) in Lake Shinji, Japan

Effect of Rainfall and pH on Musty Odor Produced in the Sanbe Reservoir

Development of phytoplankton communities and common off-flavors in a biofloc technology system used for the culture of channel catfish (Ictalurus punctatus)

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