2007 Fiscal Year Final Research Report Summary
Studies on elimination mechanism of herbivorous larvae and sessile diatoms by the allelochemicals from marine algae
| Project/Area Number |
17380111
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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 | Tohoku University |
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Principal Investigator |
TANIGUCHI Kazuya Tohoku University, Tohoku University, Graduate School of Agricultural Science, Professor (40282082)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Minoru Tohoku University, Graduate School of Agricultural Science, Professor (70050680)
AGATSUMA Yukio Tohoku University, Graduate School of Agricultural Science, Associate Professor (50292256)
ITO Kinuko Tohoku University, Graduate School of Agricultural Science, Assistant Professor (90191931)
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| Project Period (FY) |
2005 – 2007
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| Keywords | allelochemical / marine algae / herbivore''s larva / sessile diatom / isoyake / bromophenol / inhibition of metamorphosis / tribromomethane |
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| Research Abstract |
In addition to food web, marine organisms in rocky coastal ecosystem are connected through allelochemicals produced from marine algae. In the present study, a new experimental system demonstrated the hypothesis that marine algae eliminate herbivore's larvae and sessile diatoms. Die-off of macrophyte constituting marine forest during summer autumn and subsequent inhibition of the growth, and the mortality lead to the marine deforestation, "Isoyake". We clarified for the first time that the main factor leading to "Isoyake" is low nutrient level instead of high water temperature. An original experimental system using dibromomethane, a chemical inducer of the larval settlement and metamorphosis showed that the bromophenols produced and released from the brown algae Eisenia bicyclis and Ecklonia kurome inhibit larval metamorphosis of sea urchin and abalone and kill these larvae in the presence of 1 ppm and 10 ppm, respectively. Low concentrations of 1-5 ppm bromophenols also inhibit proliferation of sessile diatoms on the thallus surface. Former studies on the allelochemicals of marine algae have targeted to Laminariales algae. From GC-MS analysis of cultured seawater of 11 Fucales species and Analipus japonicus, we obtained novel results that the five Fucales species and A. japonicus release bromophenols and 10 Fucales species release tribromomethane, which is produced from crustose coralline red algae and more toxic too herbivore's larvae.
These results contribute to elucidate the mechanism of alternative stability of rocky coastal ecosystem, and establish systematization of the ecosystem management with sustainable high productivity.
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[Presentation] 褐藻ワカメの密度制御による形態変化2007
Author(s)
鹿又郁美, 山名 淳, 伊勢修夫, 李 景玉, 吾妻行雄, 谷口和也
Organizer
平成19年度日本水産学会秋季大会
Place of Presentation
函館
Year and Date
2007-09-27
Description
「研究成果報告書概要(和文)」より
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[Presentation] ナガコンブは何故長いのか?2006
Author(s)
佐藤陽一, 永井 健, 吾妻行誰, 李 景玉, 谷口和也
Organizer
平成18年度日本水産学会大会
Place of Presentation
高知市
Year and Date
2006-04-01
Description
「研究成果報告書概要(和文)」より
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