西亜北極太平洋のメソスケールの鉄濃縮は,大きな中心的なダイアトームの花を誘発します
Atsushi Tsuda1, Shigenobu Takeda, Hiroaki Saito
1Hokkaido National Research Institute, Kushiro, Hokkaido 085-0802, Japan.
まとめ
北太平洋に鉄が加えられ,植物プランクトンとバイオマスの増殖を助長した. この研究は,鉄の利用可能性が植物プランクトン種を制御し,海洋生物地球化学への影響を示しています.
科学分野:
- マリン・バイオロジー マリン・バイオロジー
- 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:
- サバークティック北太平洋の水域は,窒素が高く,クロロフィルが低いことが特徴であり,栄養素の制限を示唆しています.
- 鉄は植物プランクトンにとって重要な微量栄養素であり,その希少性は特定の海洋地域における一次生産を制限する可能性がある.
研究 の 目的:
- 鉄の制限仮説を,北太平洋の亜北極の地点でテストするために.
- 鉄の濃縮が植物プランクトンの常存量,種の構成,および生地化学的循環に及ぼす影響を調査する.
主な方法:
- インサイト鉄濃縮実験が行われました.
- 植物プランクトンの常存量,マクロ栄養素濃度,溶けた二酸化炭素のレベルは,鉄の添加前と後にモニタリングされました.
主要な成果:
- 単一の鉄濃縮により,植物プランクトンのバイオマスが大幅に増加しました.
- マクロ栄養素と溶けた二酸化炭素の濃度は,鉄を添加した後に減少した.
- 支配的な植物プランクトンの種は,ペナート diatoms から中心 diatom Chaetoceros debilis に移行し,毎日2.6倍という高い成長率を示しました.
結論:
- 鉄の生物利用性は,高窒素,低クロロフィルの水中の植物プランクトンバイオマス量を調節する重要な要因です.
- 鉄の供給後に支配的な植物プランクトンの種は,これらの水の生地化学反応に影響を与えます.
- 鉄の利用可能性は量だけでなく,植物プランクトンの種類も決定し,海洋の炭素循環に影響を与えます.
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