Analyzing the effects of species gain and loss on ecosystem function using the extended Price equation partition
Analyzing the effects of species gain and loss on ecosystem function using the extended Price equation partition
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DOI：
10.1111/j.1600-0706.2011.19656.x
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发表时间：
2012-02-01
期刊：
影响因子：
3.4
通讯作者：
Kerr, Benjamin
中科院分区：
文献类型：
--
作者：
Fox, Jeremy W.;Kerr, Benjamin
在自然界中，物种丰富度和组成，以及单个物种的功能，所有协变性都沿着环境梯度变化，因此很难区分它们对生态系统功能的影响。在这里，我们使用一种新的扩展的价格方程划分的原因之间的任何两个网站共享至少一个物种的共同功能变异。我们使用的扩展，以分离的物种损失的影响，从物种的增益;物种增益是类似于在进化中的迁移。以往关于生物多样性和生态系统功能的理论和实证研究未能区分物种增加和物种减少的影响，因此在概念上是不完整的。这种方法的应用数据总植物生物量沿着实验N富集梯度导致新的经验的见解，并揭示了微妙的影响。例如，物种增加的影响是不可忽视的，即使富集导致许多物种的损失和少数物种的增加，高生物量物种的非随机增加减少了持久物种的生物量。我们还讨论了这种新方法的解释，它提供了一个高度一般的分区影响生态系统功能的因素。
In nature species richness and composition, as well as the functioning of individual species, all covary along environmental gradients, making it difficult to tease apart their effects on ecosystem function. Here we use a novel extension of the Price equation to partition the causes of functional variation between any two sites sharing at least one species in common. We use the extension to separate effects of species loss from those of species gain; species gain is analogous to migration in evolution. Previous theoretical and empirical studies of biodiversity and ecosystem function fail to distinguish effects of species gain from those of species loss, and so are conceptually incomplete. Application of this approach to data on total plant biomass along an experimental N enrichment gradient leads to novel empirical insights and reveals subtle effects. For instance, effects of species gain are non-negligible even though enrichment leads to loss of many species and gain of few, and non-random gain of high-biomass species reduces the biomass of the persisting species. We also discuss the interpretation of this new approach, which provides a highly-general partitioning of the factors affecting ecosystem function.