Facilitating an importance index
Facilitating an importance index
复制标题
促进重要性指数
DOI：
10.1111/j.1365-2745.2009.01621.x
复制
发表时间：
2009
影响因子：
5.5
通讯作者：
Tielbörger K
中科院分区：
文献类型：
--
作者：
Seifan M;Seifan T;Ariza C;Tielbörger K
1.植物生态学中的一个未解决的问题是，正、负相互作用之间的平衡如何随着环境条件的变化而变化。最近，Brooker & Kikvidze（2008）扩大了这一争论，重新引入了互动的重要性，而不是强度，作为实证研究的适当概念。重要性是相对于所有影响因素的相互作用在性能上的差异。植物之间的积极相互作用（促进作用）在自然界中很常见。然而，所倡导的重要性指数未能解决促进问题，因此不能用于研究积极和消极互动之间平衡的转变。现有重要度指标的不足既有概念上的，也有数学上的。特别是，它们的最大性能估计是基于只有在没有邻居的情况下才能达到的假设。我们建议进行两项主要改进。首先，我们使用目标的整体最大性能作为工厂最佳性能的替代，即我们允许与邻居（即促进）更高性能的可能性。其次，我们提出了一种替代方法来处理影响测量绩效的因素。新指数在其范围内是有限的[- 1,1]，对于竞争和促进是对称的，并且它保留了Brooker & Kikvidze（2008）的原始指数的直观性质。相互作用重要性的概念对于研究沿环境梯度的相互作用是有用的。与以前的指数相比，我们的指数适应促进互动，因此提供了一个重要的概念和方法上的进步。我们提倡在未来的实证研究中使用它。
1.An unresolved question in plant ecology is how the balance between positive and negative interactions changes with environmental conditions. Recently, the debate has been expanded by Brooker & Kikvidze (2008), reintroducing the importance, rather than the intensity, of interactions as the appropriate concept for empirical studies. Importance is the difference in performance with interactions relative to all affecting factors.2.Positive interactions among plants (facilitation) are common in nature. However, the advocated importance indices fail to address facilitation and can thus not be applied to studying shifts in the balance between positive and negative interactions. The deficiencies of the current importance indices are both conceptual as well as mathematical. In particular, their maximum performance estimator is based on the assumption that it can only be attained in the absence of neighbours.3.We suggest two major improvements. First, we use the target’s overall maximum performance as a surrogate for the plant optimum, i.e. we allow the possibility of higher performance with neighbours (i.e. facilitation). Second, we propose an alternative approach to treat the factors affecting measured performance. The new index is limited in its range [−1, 1], is symmetrical for competition and facilitation, and it preserves the intuitive nature of the original index by Brooker & Kikvidze (2008).4.Synthesis. The concept of interaction importance is useful for studying interactions along environmental gradients. In contrast to previous indices, our index accommodates facilitative interactions and thus offers a significant conceptual and methodological advancement. We advocate its use in future empirical studies.
基于实验工厂性能数据的工厂相互作用指数
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
Z. Kikvidze;C. Armas
通讯作者：
C. Armas
影响因子：
5.5
作者：
Brooker, Rob W.;Kikividze, Zaal
通讯作者：
Kikividze, Zaal