海洋 捕食 者 に 対する 良い ニュース と 悪い ニュース
Matthew G Burgess1,2,3, Sarah L Becker1,2
1Department of Environmental Studies, University of Colorado Boulder, Boulder, CO, USA.
Science (New York, N.Y.)
|November 10, 2022
まとめ
海洋魚群の傾向は様々です トゥナとビルフィッシュの種は回復しているが,サメの個体数は著しく減少しており,これは保護の課題が続いていることを示している.
科学分野:
- 海洋生物学
- 漁業科学
- 保護エコロジー
背景:
- 過剰漁獲と生息地の劣化により サメの個体数は 世界的に減少しています
- 商業的に重要ないくつかの魚種は,特定の地域では回復の兆候を示しています.
- 多様な海洋メガファウナの状態を評価することは 効果的な生態系管理に不可欠です
研究 の 目的:
- 選択されたトナとビルフィッシュと比較して,様々なサメの現在の人口動向を評価する.
- これらの海洋の頂点捕食動物と商業的に価値のある魚の回復の軌跡に寄与する要因を特定する.
主な方法:
- 最近の漁業データと人口評価のメタアナリシスを利用した.
- サメ,トナ,ウミガメの1単位漁獲量 (CPUE) とバイオマス指数の比較
- 複数の国際漁業の長期監視データを分析した.
主要な成果:
- サメの個体数は研究されたほとんどの地域で一貫して広く減少しています.
- 多数のトンネやビルの種は 適度から有意な数の回復を示している.
- サメの集団の動向と漁業の圧力との間に重大な負の相関が認められた.
結論:
- サメの保全の取り組みは トナやビルフィッシュの種の保全に遅れをとっています
- サメの減少を食い止め 逆戻りさせるには 緊急かつ有望な保全戦略が必要です
- 種別漁業の管理と強力な保全政策の必要性を強調しています.
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