Algicidal bacteria that attack Dolichospermum crassum were isolated from the Karasuhara Reservoir in October 2010. Phytoplankton monitoring was performed from April 2010 to March 2011, and D. crassum was detected from August to November. At its peak frequency (in early October), it accounted for 23% of all phytoplankton cells. Heterotrophic bacteria were isolated from the surface water, and an algicidal assay was conducted. As a result, 3 out of 47 bacterial strains showed strong algicidal activity, and they completely destroyed the trichomes of D. crassum. An initial inoculation dose of only 1.0 × 102 cells ml−1 of these strains was enough to digest D. crassum. These strains were identified as Rheinheimera spp. according to 16S rDNA sequence analyses. This is the first report about algicidal bacteria that attack D. crassum. Algicidal bacteria could be key agents for controlling D. crassum in reservoirs.
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Research Article|
November 11 2016
Isolation and characterization of algicidal bacteria and its effect on a musty odor-producing cyanobacterium Dolichospermum crassum in a reservoir
Taketoshi Shimizu;
1Water Quality Laboratory, Kobe City Waterworks Bureau, Kobe, Hyogo 652-0004, Japan
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Takuya Oda;
Takuya Oda
2Global Environment Division, Kobe City Environment Bureau, Kobe, Hyogo 650-8570, Japan
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Hiroyuki Ito;
Hiroyuki Ito
1Water Quality Laboratory, Kobe City Waterworks Bureau, Kobe, Hyogo 652-0004, Japan
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Ichiro Imai
Ichiro Imai
3Plankton Laboratory, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan
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Water Supply (2017) 17 (3): 792–798.
Article history
Received:
June 21 2016
Accepted:
October 26 2016
Citation
Taketoshi Shimizu, Takuya Oda, Hiroyuki Ito, Ichiro Imai; Isolation and characterization of algicidal bacteria and its effect on a musty odor-producing cyanobacterium Dolichospermum crassum in a reservoir. Water Supply 1 May 2017; 17 (3): 792–798. doi: https://doi.org/10.2166/ws.2016.179
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