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ボトムアップの生態系トロフィックダイナミクスは,北東太平洋における魚の生産を決定する
Daniel M Ware1, Richard E Thomson
1Aquatic Ecosystem Associates, 3674 Planta Road, Nanaimo, BC V9T 1M2, Canada.
Science (New York, N.Y.)
|April 23, 2005
まとめ
海洋生態系は,植物プランクトンの存在が動物プランクトンと魚の個体数に直接影響する,強いボトムアップ制御を示しています. このトロフィック・リンクは,北米西海岸に沿って,特にワシントンやブリティッシュ・コロンビアのような生産的な地域で顕著です.
科学分野:
- 海洋生態学 海洋生態学とは
- 漁業 科学 漁業 科学
- 海洋学 海洋学 海洋学
背景:
- 海洋生態系は,ボトムアップとトップダウンの両方のプロセスに影響を受ける複雑なトロフィック相互作用を示しています.
- これらのコントロールを理解することは,効果的な漁業管理と保全に不可欠です.
研究 の 目的:
- 海洋トロフィック相互作用におけるボトムアップ対トップダウン制御の相対的な重要性を調査する.
- 北米西部の大陸の縁に沿って,魚の収穫量と一次生産を相関させる.
主な方法:
- 年間漁獲データを活用した.
- 衛星によるクロロフィルA測定 (SeaWiFS) を採用した.
- 特定の沿岸地域の動物プランクトンデータを分析した.
主要な成果:
- 維持された一次生産における重要な沿岸の変動を特定した.
- 主要生産と居住魚の収穫量との間に強い相関があることが判明しました.
- 最も高い生産性と魚の収穫量は,ワシントン州とブリティッシュ・コロンビア州南部で観測されました.
- 地域のフィトプランクトンから魚へのボトムアップの強いトロフィクリンクが確認されています.
結論:
- 海洋生態系のトロフィック相互作用は,一次生産によって推進される,ボトムアップ制御によって著しく影響を受けます.
- 植物プランクトンの利用可能性は,沿岸海域での魚の収穫の重要な決定因子です.
- これらのボトムアップの連結は,地域規模で検出され,生態系ベースの管理に情報を与えます.
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