コミュニティのバイオマスの再構成に関連したプレオ・プレイストセンのアフリカの大草食動物損失
Faysal Bibi1, Juan L Cantalapiedra2
1Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, 10115 Berlin, Germany.
まとめ
アフリカの大型哺乳類のコミュニティは 時間の経過とともに 体のサイズが小さくなっています 化石データは,近年の地質学の歴史における多様性の喪失を反映した,大型の個体と生物量の減少を明らかにしています.
科学分野:
- 古生物学
- エコロジー
- 哺乳類学
背景:
- 化石の豊富なデータは生態学的動態と分類学的減少の洞察を提供します.
- 過去のコミュニティ構造を理解することは,現在の生物多様性の傾向を解釈する上で極めて重要です.
研究 の 目的:
- ミオセンの終わりから現在までのアフリカの大型哺乳類の体質と大量分布を再構築する.
- 地質学的時間におけるコミュニティの構造とバイオマスの配分の変化を調査する.
主な方法:
- 化石の歯の測定値を使って 体重を推定した
- 化石と現存する大量分布を分析した.
- 約400万年前の コミュニティの構造を比較しました
主要な成果:
- 化石と現存の質量分布は類似しており,ユニモダルのパターンはサバンナ環境を示唆している.
- 質量は45kg以上で指数関数的に減少し,代謝スケーリング予測と一致する (傾き≈-0.75).
- 約400万年前のコミュニティは,後のコミュニティと比較して,より大きなサイズの個体とより大きなバイオマスを持っていた.
結論:
- アフリカの大型哺乳類のコミュニティは,個体とバイオマスを時間とともにより小さなサイズカテゴリーに再分配しました.
- この変化は 化石記録から 巨大な個体の消失を反映しています
- 観察された変化は,プレオ・プレイストセンの大型哺乳類の多様性の長期的減少に並行しています.
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