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クラスタ化対 壊滅的な地球規模の脊椎動物減少

Brian Leung1,2, Anna L Hargreaves3, Dan A Greenberg4

  • 1Department of Biology, McGill University, Montreal, Quebec, Canada. brian.leung2@mcgill.ca.

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|November 19, 2020
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まとめ

世界的な脊椎動物の人口動向は 誤解を招きます 極端な減少を除くと,全体的に増加し,特定の集団に焦点を当てた新しい保全指標の必要性を強調します.

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科学分野:

  • エコロジー
  • 保護生物学
  • 動物学

背景:

  • 脊椎動物の人口の減少が報告されており,以前の分析では1970年以降の減少が顕著であった.
  • 既存のグローバル平均指数は変動を隠し,分析決定に敏感であり,全体的な傾向を誤って表す可能性があります.

研究 の 目的:

  • 世界的な脊椎動物の傾向分析に対する極端な人口減少の影響を調査する.
  • 統計的に有意なクラスターに焦点を当てて,人口動向を特定し解釈するための代替アプローチを提案し評価する.

主な方法:

  • 極端に減少している個体数を除いて,既存の脊椎動物個体数データを再分析した.
  • ほとんどの傾向から統計的に逸脱する極端な減少または増加のクラスタを特定するための新しいアプローチを開発しました.
  • 特定の分類学・地理的システムにおける傾向と,動物のサイズとタイプによる傾向を調べた.

主要な成果:

  • 先ほど報告された 脊椎動物の数が50%以上減少したのは 人口の3%未満によるものでした
  • これらの極端な値を除外すると,全体的な傾向は上昇に変わりました.
  • 極端な減少集団 (個体数の約1%) と極端な増加集団 (個体数の約0.4%) を有する7つのシステムを特定した.
  • 多数 (98.6%) の個体群は,有意な世界的な傾向を示さなかったが,特定の地域やグループ (インド太平洋,爬虫類,両生類) は,有意な減少を示した.

結論:

  • 脊椎動物集団のグローバル平均トレンドは 偏差値に対して非常に敏感であり,より微妙な分析方法が必要である.
  • 極端な傾向のクラスターを特定することは,人口動態を正確に解釈し,保全の努力を優先させるのに不可欠です.
  • 地域や分類に特有の課題を効果的に解決するために,保存戦略は,これらの特定されたクラスターを考慮する必要があります.