Jansson Roland, Davies T Jonathan
Landscape Ecology Group, Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden.
Ecol Lett. 2008 Feb;11(2):173-83. doi: 10.1111/j.1461-0248.2007.01138.x. Epub 2007 Dec 7.
We used the largest DNA-based phylogeny of flowering plants to date to evaluate the importance of energy vs. past climate change in predicting global patterns in diversification. Relative diversification rates increased towards the equator, suggesting that differences in per-lineage net diversification may be an important component of the latitudinal diversity gradient. The amplitude of Quaternary climate oscillations experienced by families explained variation in diversification equally well compared to contemporary energy measures, and energy and climate change measures were intercorrelated, making it difficult to reject either as a causal mechanism. Many putative mechanisms linking diversification to energy availability do not apply to plants, whereas the climate change mechanism has more support. We also present the first global map of angiosperm diversification, showing that, after correcting for family range-size, tropical diversification rates were fastest for clades currently in regions with high endemic species richness outside the main lowland rainforest areas.
我们利用了迄今为止基于DNA的最大的开花植物系统发育树，来评估能量与过去气候变化在预测全球多样化模式中的重要性。相对多样化率向赤道方向增加，这表明每个谱系的净多样化差异可能是纬度多样性梯度的一个重要组成部分。与当代能量指标相比，各植物科经历的第四纪气候振荡幅度同样能解释多样化的变化，而且能量和气候变化指标相互关联，因此很难排除其中任何一个作为因果机制。许多将多样化与能量可用性联系起来的假定机制并不适用于植物，而气候变化机制得到了更多支持。我们还展示了第一幅被子植物多样化的全球地图，结果表明，在对植物科的分布范围大小进行校正后，对于目前位于主要低地雨林地区以外、特有物种丰富度高的地区的进化枝而言，热带地区的多样化率最快。
