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ストキャスティックなコミュニティの集まりは,より生産的な環境でより高い生物多様性を引き起こします
1Department of Biology and Tyson Research Center, Washington University, St. Louis, MO 63130, USA. jchase@wustl.edu
Science (New York, N.Y.)
|May 29, 2010
まとめ
より高い生産性は,ストキャスティックプロセスを強化することによって生物多様性を増加させ,より多くの種を生み出します. これは,より強い優先効果により生じ,生態系における複数の安定したコミュニティの均衡を生み出します.
科学分野:
- エコロジー エコロジー エコロジー
- 生物多様性 科学 科学 生物多様性
- コミュニティエコロジー コミュニティエコロジー
背景:
- 純初次生産性は生物多様性の主要な原動力であり,生産性の高い地域は一般的により多くの種を支えている.
- ベータ多様性,またはサイト間の組成の変動は,生産性とともに増加しますが,その背後にあるメカニズムは不明です.
研究 の 目的:
- 生産性とベータ多様性との関係を駆動するメカニズムを調査する.
- 生態学的組み立てプロセスが生産性のグラデーションに沿ってどのように変化するか判断する.
主な方法:
- 複製池で実施された長期実験のデータを活用した.
- ストキャスティック対決定的コミュニティアセンブリプロセスの相対的な重要性における変化を分析した.
主要な成果:
- より高い生産性は,ベータ多様性の増加と関連していました.
- このベータ多様性の増加は,生産性の上昇に伴い,決定的プロセスと比較してストキャスティックアセンブリプロセスのより強い影響によるものです.
- 組み立てメカニズムにおける観測されたシフトは,より高い生産性における優先度の強化効果の仮説と一致し,複数の安定した均衡につながる可能性がある.
結論:
- コミュニティの集会メカニズムの変化,特にストキャスティシティと優先効果の役割の増加は,生産性のグラデーション全体で観察された顕著な生物多様性グラデーションを説明する可能性があります.
- これらのメカニズムを理解することは,環境変化に対応する生物多様性のパターンを予測するために不可欠です.
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