The strength of the biodiversity–ecosystem function relationship depends on spatial scale
The strength of the biodiversity–ecosystem function relationship depends on spatial scale
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DOI：
10.1098/rspb.2018.0038
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发表时间：
2018-06
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影响因子：
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通讯作者：
Patrick L. Thompson;F. Isbell;M. Loreau;M. O’Connor;Andrew Gonzalez
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文献类型：
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作者：
Patrick L. Thompson;F. Isbell;M. Loreau;M. O’Connor;Andrew Gonzalez
我们对生物多样性和生态系统功能（BEF）之间关系的理解主要适用于精细的空间尺度。如果我们要将这些知识扩展到与保护决策相关的更广泛的空间尺度，就需要进行新的研究。在这里，我们使用模拟来检查生成 BEF 关系的尺度依赖性的条件。我们通过评估当栖息地斑块空间聚合时 BEF 关系（斜率和 R2）如何变化来研究尺度。我们发现 BEF 关系具有尺度依赖性的三种方式：（i）局部斑块之间局部（α）多样性的变化，（ii）局部 BEF 关系的空间变化以及（iii）斑块之间物种组成的不完全组成更替。前两者导致 BEF 关系的斜率随空间尺度适度增加，反映了多样性或 BEF 关系的空间变化的非线性平均。第三种机制导致更强的尺度依赖性，BEF 关系在物种面积关系的上升部分中增加，但随后随着其饱和而减小。对 Cedar Creek 草原 BEF 实验数据的分析揭示了与规模的正相关但饱和的斜率。总体而言，我们的研究结果表明 BEF 关系可能与规模相关。
Our understanding of the relationship between biodiversity and ecosystem functioning (BEF) applies mainly to fine spatial scales. New research is required if we are to extend this knowledge to broader spatial scales that are relevant for conservation decisions. Here, we use simulations to examine conditions that generate scale dependence of the BEF relationship. We study scale by assessing how the BEF relationship (slope and R2) changes when habitat patches are spatially aggregated. We find three ways for the BEF relationship to be scale-dependent: (i) variation among local patches in local (α) diversity, (ii) spatial variation in the local BEF relationship and (iii) incomplete compositional turnover in species composition among patches. The first two cause the slope of the BEF relationship to increase moderately with spatial scale, reflecting nonlinear averaging of spatial variation in diversity or the BEF relationship. The third mechanism results in much stronger scale dependence, with the BEF relationship increasing in the rising portion of the species area relationship, but then decreasing as it saturates. An analysis of data from the Cedar Creek grassland BEF experiment revealed a positive but saturating slope of the relationship with scale. Overall, our findings suggest that the BEF relationship is likely to be scale dependent.