ダイアトム炭素の輸出は,北東大西洋のシリケート上流によって強化された
John T Allen1, Louise Brown, Richard Sanders
1National Oceanography Centre, Southampton SO14 3ZH, UK. jta@noc.soton.ac.uk
Nature
|September 30, 2005
まとめ
ダイアトムは,不安定な海面から供給される深水シリケートを採掘することで,花期を延長します. このシリケート肥料化メカニズムは,北大西洋における炭素収縮を促進し,生物ポンプにおける前頭部領域の重要な役割を明らかにしています.
科学分野:
- マリン・バイオロジーの海洋生物学
- 海洋学 海洋学とは
- バイオジオケミストリー バイオジオケミストリー
背景:
- ダイアトムは,細胞壁のためにシリコン (Si) を使用する重要な植物プランクトンです.
- 北大西洋における栄養素の動態は,高い窒素の可用性にもかかわらず,藻の開花を制限する.
- 前頭部領域は,生物ポンプを通じて炭素を吸収するのに不可欠です.
研究 の 目的:
- シリケートに限られた北大西洋前部地域におけるダイアトームの開花を延長するメカニズムを調査する.
- ダイアトムは,栄養素の枯渇にもかかわらず,どのように炭素の結合を強化するのかを理解するために.
- 植物プランクトンの生産性に対するシリケート供給のより広範な影響を調査する.
主な方法:
- 北大西洋のフロントゾーンにおける栄養素濃度 (シリケート,窒素) の分析.
- 海洋学的な特徴と関連したダイアトームの花の動態の観察.
- シリケート供給のモデリングとその原産物に与える影響.
主要な成果:
- ダイアトムの開花は,深海からシリケート"採掘"によって維持されます.
- 不安定な海面が定期的にシリケートを供給し,ダイアトムの成長を延ばしている.
- このシリケート肥料化により,炭素輸出イベントが強化されます.
結論:
- 前頭部領域は,シリケート媒介のダイアトームの咲きを通して,生物学的ポンプで重要な役割を果たします.
- "シリケート採掘"メカニズムは,炭素収縮の鍵となる栄養素供給を強調しています.
- 同様のメカニズムは,他の栄養素に制限された海洋地域でも動作する可能性があります.
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