オープンオーシャンにおける捕食者の多様性のグローバルパターン
Boris Worm1, Marcel Sandow, Andreas Oschlies
1Biology Department, Dalhousie University, Halifax, NS, Canada B3H 4J1. bworm@dal.ca
まとめ
トンナやビルフィッシュを含む海洋捕食者の多様性は,明確な亜熱帯のホットスポットを示しています. この多様性は,気候変動と漁業の圧力により,世界的に減少しています.
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
- 生態系のダイナミクス
背景:
- オープンオーシャンは最大のバイオームを表していますが,種多様性のパターンは依然として十分に理解されていません.
- 海洋生物多様性の理解は,生態系の健康と機能の評価に不可欠です.
研究 の 目的:
- 過去50年間にわたり,トンネやヒョウの多様性の世界的なパターンと傾向を調査する.
- 海洋捕食者の多様性に影響を与える環境要因を特定し,時間経過による変化を評価する.
主な方法:
- トンナとヒョウの個体数に関する50年間の世界的なデータセットの分析.
- 熱フロント,溶けた酸素,温度を含む海洋学データとの相関分析.
- 漁業圧力とエルニニョ・サザンオシレーション (ENSO) イベントの影響の評価.
主要な成果:
- 肉食動物の多様性が高い明確な亜熱帯のホットスポットが特定されました.
- 多様性は熱面と溶けた酸素と正の相関関係があり,最適な温度は約25°Cです.
- 漁業の増加とENSOの変動性に関連して,すべての海洋で多様性の有意な減少 (10-50%) が観察されました.
結論:
- 海洋捕食者の多様性は予測可能なパターンを示していますが,世界的に侵食されています.
- 観測された減少は,気候と漁業によって引き起こされる広範な生態系変化の兆候です.
- 保護戦略は,気候への影響と持続可能な漁業の実践の両方に対処する必要があります.
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