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Interactions between frequency and size of disturbance affect competitive outcomes

机译：干扰的频率和大小之间的相互作用会影响竞争结果

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摘要

Disturbance has many effects on ecological communities, and it is often suggested that disturbance can affect species diversity by altering competitive outcomes. However, disturbance regimes have many distinct aspects that may act, and interact, to influence species diversity. While there are many theoretical models of disturbance-prone communities, few have specifically documented how interactions between different aspects of a disturbance regime change competitive outcomes. Here, we present a model of two plant species subject to disturbance which we then use to examine species coexistence over varying levels of two aspects of disturbance: frequency, and spatial extent (i.e., area disturbed). We show that the competitive outcome is affected differently by changes in each aspect and that the effect of disturbance frequency on species coexistence depends strongly on the spatial extent of the disturbance, and vice versa. We classify the nature of these interactions between disturbance frequency and extent on the basis of the shape of the resulting coexistence regions in a frequency-extent parameter plane. Our results illustrate that different types of interaction can result from differences in life-history traits that control species-specific sensitivity to frequency and extent of disturbance. Thus, our analysis shows that the various aspects of disturbance must be carefully considered in concert with the life-history traits of the community members in order to assess the consequences of disturbance.
机译：干扰对生态群落有许多影响，通常认为干扰可通过改变竞争结果而影响物种多样性。但是，扰动机制具有许多不同的方面，它们可能起作用并相互作用，从而影响物种的多样性。尽管有许多易受干扰社区的理论模型，但很少有文献专门记录了扰动制度不同方面之间的相互作用如何改变竞争成果。在这里，我们提出了两种受到干扰的植物物种的模型，然后将其用于检查物种在两个方面的变化（频率和空间范围（即区域被干扰））的不同水平上的共存。我们表明竞争结果受各个方面变化的影响不同，并且干扰频率对物种共存的影响在很大程度上取决于干扰的空间范围，反之亦然。我们根据频率范围参数平面中所形成的共存区域的形状，将干扰频率和范围之间的这些相互作用的性质进行分类。我们的结果表明，不同的相互作用类型可以由生活史特征的差异所引起，这些特征控制着物种对干扰频率和程度的特定敏感性。因此，我们的分析表明，必须根据社区成员的生活历史特征仔细考虑干扰的各个方面，以评估干扰的后果。

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  • 来源
    《Ecological research》 |2012年第4期|p.783-791|共9页
  • 作者

    Adam Miller; Dan Reilly; Spenser Bauman; Katriona Shea;

  • 作者单位

    Department of Biology, Eberly College of Science, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA;

    Department of Chemical Engineering, University of Illinois, Champaign, IL, USA;

    Department of Biology, Eberly College of Science, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA;

    Department of Biology, Eberly College of Science, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coexistence; disturbance aspects; extent; frequency; species diversity;

    机译：共存干扰方面;程度;频率;物种多样性;

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