School of Marine and Tropical Biology, ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia.
Ecol Lett. 2013 Feb;16(2):140-50. doi: 10.1111/ele.12019. Epub 2012 Oct 24.
A major ecosystem effect of biodiversity is to stabilise assemblages that perform particular functions. However, diversity-stability relationships (DSRs) are analysed using a variety of different population and community properties, most of which are adopted from theory that makes several restrictive assumptions that are unlikely to be reflected in nature. Here, we construct a simple synthesis and generalisation of previous theory for the DSR. We show that community stability is a product of two quantities: the synchrony of population fluctuations, and an average species-level population stability that is weighted by relative abundance. Weighted average population stability can be decomposed to consider effects of the mean-variance scaling of abundance, changes in mean abundance with diversity and differences in species' mean abundance in monoculture. Our framework makes explicit how unevenness in the abundances of species in real communities influences the DSR, which occurs both through effects on community synchrony, and effects on weighted average population variability. This theory provides a more robust framework for analysing the results of empirical studies of the DSR, and facilitates the integration of findings from real and model communities.
生物多样性的一个主要生态系统效应是稳定执行特定功能的组合。然而，多样性-稳定性关系（DSR）是使用各种不同的种群和群落特性来分析的，其中大多数特性是从理论中采用的，这些理论做出了几个限制性假设，这些假设不太可能反映在自然界中。在这里，我们构建了一个简单的综合和概括之前关于 DSR 的理论。我们表明，群落稳定性是两个数量的产物：种群波动的同步性，以及由相对丰度加权的平均物种水平种群稳定性。加权平均种群稳定性可以分解，以考虑丰度均值方差缩放、多样性下平均丰度变化以及单培养物种平均丰度的差异的影响。我们的框架明确了现实群落中物种丰度的不均匀性如何影响 DSR，这既通过对群落同步性的影响，也通过对加权平均种群变异性的影响来实现。该理论为分析 DSR 的实证研究结果提供了一个更稳健的框架，并促进了真实和模型群落的发现的整合。
