Testing addition of <Emphasis Type="Italic">Pseudomonas fluorescens</Emphasis> HYK0210-SK09 to mitigate blooms of the diatom <Emphasis Type="Italic">Stephanodiscus hantzschii</Emphasis> in small- and large-scale mesocosms |
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Authors: | Seung Won Jung Yoon-Ho Kang Toshiya Katano Baik-Ho Kim Soo-Yeon Cho Jin Hwan Lee Young-Ok Kim Myung-Soo Han |
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Institution: | (1) South Sea Institute, Korea Ocean Research and Development Institute, Geoje, 656-830, Republic of Korea;(2) Department of Life Science, Hanyang University, Seoul, 133-791, Republic of Korea;(3) Ariake Sea Research Project, Saga University, Saga 840-8502, Japan;(4) Department of Environmental Science, Konkuk University, Seoul, 143-701, Republic of Korea;(5) Department of Life Science, Sangmyung University, Seoul, 110-743, Republic of Korea; |
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Abstract: | An algicidal bacterium Pseudomonas fluorescens HYK0210-SK09 (SK09) was applied to a natural bloom of Stephanodiscus hantzschii using a small-scale mesocosm (SM) and a large-scale mesocosm (LM) to clarify the algicidal effects and evaluate the response
of the planktonic community and environments. When SK09 cells were inoculated at a final concentration of 5 × 106 cells mL−1, the abundance of S. hantzschii decreased significantly by 95% in SM and 85% in LM. The microcosm in the laboratory revealed that the abundance of Pseudomonas increased rapidly after inoculation with a corresponding decrease in the S. hantzschii population. Nutrient concentrations increased following the decline in the diatom cells. The abundances of nondominant species
such as Chlamydomonas, Cryptomonas, and Navicula increased slightly with increased nutrient concentrations. The abundance of heterotrophic protists also increased significantly
due to utilization of SK09 as food. The present study demonstrates that SK09 is an effective biocontrol agent for natural
S. hantzschii bloom, and grazing pressure plays a crucial role in the successful application of algicidal bacteria to natural environments. |
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