2007 Fiscal Year Final Research Report Summary
Algicidal bacteria in seaweed beds and red tide areas, and application for prevention of red tide occurrences
| Project/Area Number |
16380131
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Kyoto University |
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Principal Investigator |
IMAI Ichiro Kyoto University, Graduate School of Agriculture, Associate Professor (80271013)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAHARA Hiroyuki Kyoto University, Graduate School of Agriculture, Professor (80026567)
YOSHINAGA IKuo Kyoto University, Graduate School of Agriculture, Assistant Professor (40230776)
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| Project Period (FY) |
2004 – 2007
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| Keywords | red tides / algicidal bacteria / control / seaweed bed / Zostera bed / detrital particle / development of seaweed bed / Seto Inland Sea |
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| Research Abstract |
Algicidal bacteria, that kill microalgae, play an important role in terminating red tides in the coastal sea, and are hoped to apply for the control of red tide occurrences in near future. We found the existence of huge number of algicidal bacteria attaching to the surface of seaweeds (max. several millions /g wet tissue) for the first time in the coast of the Seto Inland Sea, and showed a possibility as the important source for algicidal bacteria in coastal ecosystem.
Many algicidal bacteria were isolated from the seawater and seaweeds in the seaweed bed of the bank of the Kansai International Airport. Algicidal bacteria were mainly composed of Bacteroides group and γ-proteobacteria, and α-proteobacteria (first record) as minor group. Main genera were Cytophaga, Alteromonas and Pseudoalteromonas.
In Harima-Nada, main red tide area of the Seto Inland Sea, algicidal bacteria were isolated from the seawater samples of the fractions of "free-living" and "particle-associated" (>3μm) in the summer season. Frequency of algicidal bacteria was much higher in "particle-associated" fraction than "free-living" (5 times). Algicidal bacteria tend to live on the detrital particles.
Bacteria were isolated from the surface of Zostera and from seawater in a Zostera bed in Osaka Bay. The densities of algicidal bacteria were found to be 1 × 10^7〜 9 × 10^7 per g wet leaf on the surface of seagrass, which were about one order of higher than the case of seaweeds (first discovery). In seawater of the Zostera bed, algicidal bacteria were in the order of 10^3〜 10^4 cells per ml. Cell densities of phytoplankton were extremely few in seawater in the Zostera bed. It is considered that algicidal bacteria in Zostera beds vigorously kill microalgae and these bacteria would play an important role in prevention of red tide occurrence.
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[Journal Article] Algicidal bacteria isolated from the surface of seaweeds from the coast of Osaka Bay in the Seth Inland Sea, Japan2006
Author(s)
Imai, I., D., Fujimaru, T., Nishigaki, M., Kurosaki, H., Sugita
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Journal Title
African Journal of Marine Science 28
Pages: 319-323
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 微生物による防除2008
Author(s)
今井一郎・長崎慶三
Organizer
2008年度日本プランクトン学会春季シンポジウム
Place of Presentation
東京海洋大学(東京)
Year and Date
2008-03-26
Description
「研究成果報告書概要(和文)」より
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[Presentation] Discovery of 4th International Workshop on Targeted abundant existence of algicidal bacteria including killers for the noxious dinoflagellate Cochlochnium polykrikoides in a seaweed bed in Osaka Bay, the Seth Inland sea, Japan2007
Author(s)
Imai, I., T., Yamamoto, K., Ishii, K., Yamamoto
Organizer
HAB Species in the East Asia Waters-EASTHAB 4
Place of Presentation
Changwon, Korea
Year and Date
20071207-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Isolation of algicidal bacteria that kill Cochlodinium polykrikoides from Yatsushiro Sea2007
Author(s)
Imai, I., S., Kimura, Y., Tomaru, K., Nagasaki, K., Sakurada, K., Murata
Organizer
2007 Autumn Meeting of the Japanese Society of Fisheries Science
Place of Presentation
Hakodate
Year and Date
20070925-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 微生物による赤潮の防除2007
Author(s)
今井一郎
Organizer
2007(平成19)年度日本水産学会春季大会
Place of Presentation
東京海洋大学(東京)
Year and Date
20070327-31
Description
「研究成果報告書概要(和文)」より
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[Presentation] Differences in susceptibility of harmful raphidophytes and dinoflagellates to algicidal bacteria isolated from coastal sea and seaweed beds2006
Author(s)
Imai, L., T., Tsuchiya, I., Yoshinaga, N., Sugino, H., Okamoto
Organizer
12th International Conference on Harmful Algae
Place of Presentation
Copenhagen, Denmark
Year and Date
20060904-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Algicidal bacteria isolated from the surface of seaweeds from the coast of Osaka Bay, Seth Inland Sea, Japan2004
Author(s)
Imai, I., D., Fujimaru, T., Nishigaki, M., Kurosaki, H., Sugita
Organizer
11th International conference on Harmful Algal Blooms
Place of Presentation
Cape Town, South Africa
Year and Date
20041114-19
Description
「研究成果報告書概要(欧文)」より
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[Presentation] On algicidal bacteria living in seaweed beds2004
Author(s)
Tsuchiya, T., I., Imai, H., Okamoto, N., Sugino
Organizer
2004 Joint Meeting of the Plankton Society of Japan and the Japanese Association of Benthology
Place of Presentation
Ehime Univ., Matsuyama
Year and Date
20040924-26
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 殺藻細菌を用いた赤潮防除の可能性2004
Author(s)
今井一郎
Organizer
平成16年度生物工学若手研究者の集い夏のセミナー
Place of Presentation
内灘長福祉センター憩(石川県内灘町)
Year and Date
20040730-31
Description
「研究成果報告書概要(和文)」より
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[Book] 海の環境微生物学2005
Author(s)
今井一郎
Total Pages
184-185
Publisher
恒星社厚生閣
Description
「研究成果報告書概要(和文)」より
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