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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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,960,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥660,000)
Fiscal Year 2007: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2006: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2005: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | allelochemical / marine algae / herbivore''s larva / sessile diatom / isoyake / bromophenol / inhibition of metamorphosis / tribromomethane / ジブロモフェノール / トリブロモフェノール / 増殖阻害 / ヒバマタ目褐藻 / 海中林 / カジメ / 光合成 / 栄養塩濃度 / クロロフィル量 / キタムラサキウニ / エゾバフンウニ / 変態 / 無節サンゴモ |
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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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Report
(4 results)
Research Products
(116 results)
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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
Related Report
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[Presentation] エゾアワビは海中林内では発生できない2007
Author(s)
李 景玉, 吾妻行雄, 谷口和也
Organizer
2007(平成19)年度日本水産学会春季大会
Place of Presentation
東京
Year and Date
2007-03-30
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] 温暖化傾向による牡鹿半島周辺海藻相の変化2006
Author(s)
成田美智子, 遠藤 光, 吾妻行雄, 谷口和也
Organizer
第3回東北大学バイオサイエンスシンポジウム
Place of Presentation
仙台
Year and Date
2006-05-29
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] ナガコンブとオニコンブの物質蓄積様式2006
Author(s)
李 景玉, 吾妻行雄, 佐藤陽一, 永井 健, 谷口和也
Organizer
第3回東北大学バイオサイエンスシンポジウム
Place of Presentation
仙台
Year and Date
2006-05-29
Description
「研究成果報告書概要(和文)」より
Related Report
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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
Related Report
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[Presentation] 褐藻ワカメの藻体切除による再成長2006
Author(s)
山名 淳, 吾妻行雄, 谷口和也, 伊勢修夫
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
Related Report
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[Presentation] 褐藻エゾノネジモクの炭素-窒素収支2005
Author(s)
沼田茂仁, 吾妻行雄, 谷口和也
Organizer
平成17年度日本水産学会東北-北海道合同支部大会
Place of Presentation
仙台
Year and Date
2005-11-05
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] 和歌山県西岸におけるウニの成長と植生2005
Author(s)
吉崎寿仁, 吾妻行雄, 荒川久幸, 谷口和也
Organizer
平成17年度日本水産学会大会
Place of Presentation
東京
Year and Date
2005-04-02
Description
「研究成果報告書概要(和文)」より
Related Report
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