海洋の大量絶滅の生態学的選択性
Jonathan L Payne1, Andrew M Bush2, Noel A Heim3
1Department of Geological Sciences, Stanford University, 450 Serra Mall, Building 320, Stanford, CA 94305-2115, USA. jlpayne@stanford.edu.
まとめ
現代の海洋生物多様性の喪失は 過去の絶滅とは違って 大きな体を持つ種を 圧倒的に脅かしています この変化は現在の絶滅の脅威による 将来の生態学的破壊の兆しです
科学分野:
- 海洋生物学
- 古生物学
- 保護科学
背景:
- 海洋生態系における現在の生物多様性の危機は 重要な生態学的,進化的課題をもたらしています
- 絶滅の危険性のパターンを理解することは 将来の生態系変化を予測するのに不可欠です
研究 の 目的:
- 近代的な海洋生物の生態学的特徴と絶滅の脅威の関連を,過去の絶滅の出来事と比較する.
- 海洋生物多様性の減少がもたらす生態学的影響を予測する
主な方法:
- 2497種の海洋脊椎動物と軟体動物のデータベースを利用した.
- 現代の海洋と過去の大量絶滅の脅威パターンを比較した.
- 絶滅の脅威と身体の大きさや生息地 (ペラジックとベンシック) の間の関連を分析した.
主要な成果:
- 現代の絶滅の脅威は 海洋生物の大きな体型と密接に関連しています
- 過去の絶滅は非選択的であったか,小さな体を持つ分類を削除した.
- 過去の絶滅に より脆弱だったペラジック種は 今日では 優先的に 脅かされていません
結論:
- 現代の海洋生物多様性の危機は 過去の出来事と比べて 絶滅のリスクのパターンが異なっています
- 大きな体を持つ種に対する 過剰な脅威は 将来の生態学的破壊の可能性を 示唆しています
- 現在の絶滅傾向は 過去の大量絶滅よりも 海洋生態系に重大な機能的変化をもたらす可能性があります
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