Spatial scale dictates the productivity-biodiversity relationship
Spatial scale dictates the productivity-biodiversity relationship
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DOI：
10.1038/416427a
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发表时间：
2002-03-28
期刊：
影响因子：
64.8
通讯作者：
Leibold, MA
中科院分区：
文献类型：
--
作者：
Chase, JM;Leibold, MA
生命的多样性在地球上分布不均。造成这种模式的主要原因是某一特定地点的生物群可获得的能量或初级生产力（通过光合作用固定碳的速率）的异质性（1-12）。但生产力和物种多样性之间关系的形态是高度可变的（10-14）。在许多情况下，这种关系呈“驼峰形”，多样性在中等生产力（7,9,10,12,10,15-18）时达到峰值。在其他情况下，多样性随生产力线性增加（4-6,10-12）。造成这种差异的一个可能原因是数据通常是在不同的空间尺度上收集的（10,12,14）。如果决定物种多样性的机制随空间尺度而变化，那么生产力-多样性关系的形态也会随之变化。在这里，我们提出了池塘中依赖规模的生产力多样性模式的证据。当在局部尺度（池塘之间）查看数据时，这种关系呈驼峰状，而当在区域尺度（流域之间）查看相同的数据时，这种关系呈正线性。这种对尺度的依赖是由于区域内本地物种组成的差异随着生产力的增加而增加。
The diversity of life is heterogeneously distributed across the Earth. A primary cause for this pattern is the heterogeneity in the amount of energy, or primary productivity (the rate of carbon fixed through photosynthesis), available to the biota in a given location(1-12). But the shape of the relationship between productivity and species diversity is highly variable(10-14). In many cases, the relationship is 'hump-shaped', where diversity peaks at intermediate productivity(7,9,10,12,10,15-18). In other cases, diversity increases linearly with productivity(4-6,10-12). A possible reason for this discrepancy is that data are often collected at different spatial scales(10,12,14). If the mechanisms that determine species diversity vary with spatial scale, then so would the shape of the productivity-diversity relationship. Here, we present evidence for scale-dependent productivity-diversity patterns in ponds. When the data were viewed at a local scale (among ponds), the relationship was hump-shaped, whereas when the same data were viewed at a regional scale (among watersheds), the relationship was positively linear. This dependence on scale results because dissimilarity in local species composition within regions increased with productivity.