Cadotte Marc William
Complex Systems Group, Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee 37996, USA.
Ecology. 2007 Apr;88(4):823-9. doi: 10.1890/06-1117.
The competition-colonization trade-off has long been a mechanism explaining patterns of species coexistence and diversity in nonequilibrium systems. It forms one explanation of the intermediate disturbance hypothesis (IDH) for local communities--specifically that diversity should be maximized at intermediate disturbance frequencies, yet only a fraction of empirical studies support IDH predictions. Similarly, this trade-off is also a powerful explanation of coexistence at larger spatial scales. I show, with a microbial experimental system, that the diversity-disturbance relationship is dependent on the relative distribution of species along this trade-off. Here I show that, when species are skewed toward late-successional habits, local diversity declines with disturbance. Yet, despite this trait skew, diversity at scales larger than the patch appears insensitive to the trade-off distribution. Intermediate disturbance frequencies produce the greatest diversity in patch successional stage, thus benefiting the maximum number of species at larger scales.
竞争-定殖权衡长期以来一直是解释非平衡系统中物种共存模式和多样性的一种机制。它构成了局部群落的中度干扰假说（IDH）的一种解释——具体而言，多样性应在中等干扰频率下最大化，但只有一部分实证研究支持IDH的预测。同样，这种权衡也是更大空间尺度上共存的有力解释。我通过一个微生物实验系统表明，多样性-干扰关系取决于物种在这种权衡中的相对分布。在这里我表明，当物种倾向于后期演替习性时，局部多样性会随着干扰而下降。然而，尽管存在这种性状偏差，但大于斑块尺度的多样性似乎对权衡分布不敏感。中等干扰频率在斑块演替阶段产生最大的多样性，从而在更大尺度上使最多数量的物种受益。
