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ココリトフォリドカルシフィケーションに対する微量金属の利用可能性の影響

K G Schulz¹, I Zondervan, L J A Gerringa

¹Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, 27515 Bremerhaven, Germany. kschulz@ifm-geomar.de

|August 6, 2004

まとめ

大気中の塵は,大気中の塵である.

科学分野:

海洋学海洋学とは
マリン・バイオジオケミストリー
古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは

背景:

海洋の塵の堆積は地質的な時間によって変化します.
鉄や亜鉛のような塵からの微量金属は,植物プランクトンにとって不可欠な栄養素である.
塵の供給の変動は,海洋の一次生産と炭素循環に影響を与える可能性があります.

研究の目的:

エミリアニアにおける鉄と亜鉛の影響を調査する. huxleyi.yi
微量金属の制限が生物学的化にどのように影響するかを決定する.
塵の堆積が海洋の生物学的炭素ポンプに与える影響を理解する.

主な方法:

海洋微藻Emiliania huxleyiを様々な濃度の鉄と亜鉛で培養した.
測定された成長率と炭酸カルシウム (CaCO3) 生産.
微粒子有機炭素とCaCO3輸出の比率 (雨量比率) を分析した.

主要な成果:

低鉄分は,エミリアニアの成長とカルシフィケーションの両方を低下させた.
低亜鉛は,カルシフィケーションからの成長を切り離し,より多くのカルシフィケーション細胞につながった.
亜鉛制限細胞は,成長が遅いにもかかわらず,細胞毎のCaCO3生産率に影響を受けなかった.

結論:

トレースメタル,特に亜鉛の利用可能性は,生物学的カルシフィケーションに大きな影響を与えます.
塵の堆積の変化は,微量金属に限られた海洋地域における化を変化させる可能性があります.
石灰化の変動は,海洋のCO2収縮と大気分割に影響を与える可能性があります.

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