Dispersal scales up the biodiversity–productivity relationship in an experimental source-sink metacommunity
Dispersal scales up the biodiversity–productivity relationship in an experimental source-sink metacommunity
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扩散扩大了实验源库元群落中的生物多样性与生产力关系
DOI：
10.1098/rspb.2009.2104
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
N. Mouquet
中科院分区：
文献类型：
--
作者：
P. Venail;R. MacLean;C. Meynard;N. Mouquet
生物多样性对生态系统功能的影响是生态学研究的一个重要问题。然而，生物多样性与生态系统功能之间的关系往往是独立于允许共存的机制之外进行研究的。通过考虑扩散和生态位划分对多样性的影响，元共生性的角度预测的空间尺度依赖的形状的关系。在这里，我们提出了这种规模依赖模式的实验证据。经过大约500代的多样化在空间异质性的环境中，我们测量了功能多样性（FD）和生产力在本地和区域规模的实验源-汇metaceritivities的细菌荧光假单胞菌SBW 25。在区域尺度上，环境异质性产生了高水平的FD，我们观察到多样性和生产力之间的正相关关系。在局部尺度上，中间扩散增加当地FD通过质量效应，但多样性和生产力之间没有相关性。这些实验结果强调了在理解其与生态系统功能的关系时考虑维持生物多样性的机制和适当的空间尺度的重要性。
The influence of biodiversity on ecosystem functioning is a major concern of ecological research. However, the biodiversity–ecosystem functioning relationship has very often been studied independently from the mechanisms allowing coexistence. By considering the effects of dispersal and niche partitioning on diversity, the metacommunity perspective predicts a spatial scale-dependence of the shape of the relationship. Here, we present experimental evidence of such scale-dependent patterns. After approximately 500 generations of diversification in a spatially heterogeneous environment, we measured functional diversity (FD) and productivity at both local and regional scales in experimental source-sink metacommunities of the bacterium Pseudomonas fluorescens SBW25. At the regional scale, environmental heterogeneity yielded high levels of FD and we observed a positive correlation between diversity and productivity. At the local scale, intermediate dispersal increased local FD through a mass effect but there was no correlation between diversity and productivity. These experimental results underline the importance of considering the mechanisms maintaining biodiversity and the appropriate spatial scales in understanding its relationship with ecosystem functioning.