海洋渦巻の境界における栄養素の共同制限
Thomas J Browning1, Eric P Achterberg1, Insa Rapp1
1Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research, Kiel 24148, Germany.
Nature
|November 2, 2017
まとめ
海洋の原産物は窒素と鉄によって 制限されています 実験によると この2つを添加すると 植物プランクトンの成長が著しく促進され 他の栄養素も作用します
科学分野:
- 海洋生物学
- 海洋学
- 生地化学
背景:
- 栄養素の制限は 海洋の原産物を決定的に制御し 海洋の食物網と炭素循環に影響します
- オリゴトロフィック亜熱帯の渦巻は 極端な生産性の移行を表しますが これらの地域の栄養素の制限は 十分に理解されていません
研究 の 目的:
- 南大西洋の東の境界で 栄養素の制限を調査する
- 植物プランクトンの成長に対する窒素,鉄,その他の微量栄養素の影響を決定する.
主な方法:
- 南大西洋の渦巻で栄養素修正実験を行った.
- クロロフィルA濃度と植物プランクトン群の構成を測定した.
主要な成果:
- 窒素や鉄の個別添加は,植物プランクトンの成長を有意に刺激しなかった.
- 窒素と鉄の併用により クロロロフィルAの濃度が40倍まで増加し,藻の成長を促進し,多様性を減少させた.
- コバルトやビタミンB12は,窒素・鉄の制限が緩和された後,クロロフィルAの産量をさらに3倍にしました.
結論:
- 窒素と鉄の共同制限は海洋地域では広範囲に広がっています.
- コバルトのような微量栄養素を含む多栄養素の制限は広く存在し,植物プランクトンコミュニティの構造と多様性に影響を与えます.
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