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N2を固定するコロニアルサイアノバクテリアトライコデスミウム (Trichodesmium) の大西洋横断の豊富さ
Cabell S Davis1, Dennis J McGillicuddy
1Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543-1541, USA. cdavis@whoi.edu
Science (New York, N.Y.)
|June 10, 2006
まとめ
植民地のダイアゾトロフィックサイアノバクテリア,トリコデスミウム (Trichodesmium) は,海洋の窒素供給に不可欠である. 大西洋横断の調査により,以前知られていたより高い地表の豊富さが明らかになり,世界の海洋窒素循環に影響を与えました.
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 海洋学
- 微生物学 微生物学とは
背景:
- コロニアル・ディアゾトロフィック・シアノバクテリア (Trichodesmium属) は,熱帯および亜熱帯海における窒素の供給に不可欠である.
- これらの微生物は,地球の表面の約半分をカバーする海洋生態系に住んでいます.
研究 の 目的:
- 北大西洋におけるトライコデスミウムコロニーの豊富性と分布パターンを調査する.
- トライコデスミウム (Trichodesmium) の個体群に海洋の特徴や事象が及ぼす影響を理解する.
主な方法:
- 非侵襲的な水中デジタル顕微鏡 (ビデオプランクトンレコーダー) を使用したトランスアトランティック調査.
- 顕微鏡を6m/sで牽引し,表面から130mの深さまで波状に振動する.
- コロニーの繁殖傾向,アンチサイクロン渦との関連,ハリケーンによる混合の影響について分析した.
主要な成果:
- トリコデスミウムコロニーの豊富さは,盆地規模の傾向を示し,アンチサイクロン渦と明確な関連を示した.
- コロニーの豊かさは,ハリケーンによる混合の影響を受けなかった.
- 地下トライコデスミウムの豊富さは,以前に報告されたよりも高いことが判明しました.
結論:
- この研究は,北大西洋におけるトリコデスミウムの分布に関する新しい洞察を提供します.
- 予想よりも高い地表の豊富さは,世界の海洋窒素循環に重大な影響を及ぼします.
- 海洋の窒素循環におけるトリコデスミウムの役割は,これまで理解されていたよりもはるかに重要かもしれません.
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