ミヴァットン湖のの高幅の変動と代替的な動的状態
Anthony R Ives1, Arni Einarsson, Vincent A A Jansen
1Department of Zoology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. arives@wisc.edu
Nature
|March 7, 2008
まとめ
中間のTanytarsus gracilentusの複雑な集団動態は,消費者-資源モデルにおける代替的な動態状態によって説明されました. 資源補助金と環境の変動が,これらの高幅で不規則な変動を牽引しています.
科学分野:
- エコロジー エコロジー エコロジー
- 人口のダイナミクス
- 理論的なエコロジー
背景:
- 複雑な集団動態は生態学モデルではよく見られるが,自然界では文書化されていない.
- アイスランドのミヴァットン湖で,大きな不規則な密度変動を呈している.
研究 の 目的:
- 生態学的モデルを用いてTanytarsus gracilentusの複雑な集団動態を説明する.
- 人口変動を誘発する他の動的状態と資源補助金の役割を調査する.
主な方法:
- タニタルス (Tanytarsus gracilentus) の長期的なタイムシリーズデータの分析.
- ダイナミックな能力が異なる3つの消費者資源モデルをミドルデータに合わせた.
- 異なる初期条件と資源補助金の下でのモデル行動の調査.
主要な成果:
- 最適なモデルは,代替的な動的状態 (固定点対高振幅サイクル) を示した.
- 不規則で高い振幅の変動は,これらの状態間のストキャスティシティスイッチングダイナミクスによるものです.
- 人口の変動幅は,資源補助金に対して非常に敏感であり,掘削などの人間の活動によって影響を受けることがあります.
結論:
- 代替的な動的状態は,Tanytarsus gracilentusの観察された複雑な集団動態のメカニズムを提供します.
- 資源補助金と環境の変動は,これらの変動の重要な原動力である.
- 湖水学に対する人間の影響は,人口の不安定性を悪化させ,より広い生態系に影響を与える可能性があります.
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