Edinburgh Research Explorer Evolutionary diversity in tropical tree communities peaks at intermediate precipitation
Edinburgh Research Explorer Evolutionary diversity in tropical tree communities peaks at intermediate precipitation
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爱丁堡研究探索者热带树木群落的进化多样性在中等降水量时达到顶峰
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Taylor Spears
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作者：
Taylor Spears
植物物种和进化多样性的全球格局主要由温度梯度决定，但在热带地区，降水梯度可能更重要，植物物种丰富度与降雨量呈正相关。然而，降水量对进化多样性分布的影响在很大程度上是未知的。在这里，我们详细介绍了进化多样性的变化沿着降水梯度，汇集了一个全面的数据库的组成被子植物树木群落在整个低地热带南美洲（2,025库存从潮湿到干旱的生物群落），和一个新的，大规模的系统发育假说发生在这些生态系统中的属。我们发现在低降水量的社区的进化多样性显着减少。然而，与物种丰富度不同的是，进化多样性不会随着降雨量的增加而不断增加。相反，我们的研究结果表明，最大的进化多样性是在中间降水制度，并有一个下降的进化多样性超过1,490毫米的平均年降雨量。如果保护是为了优先考虑进化多样性，
Global patterns of species and evolutionary diversity in plants are primarily determined by a temperature gradient, but precipitation gradients may be more important within the tropics, where plant species richness is positively associated with the amount of rainfall. The impact of precipitation on the distribution of evolutionary diversity, however, is largely unexplored. Here we detail how evolutionary diversity varies along precipitation gradients by bringing together a comprehensive database on the composition of angiosperm tree communities across lowland tropical South America (2,025 inventories from wet to arid biomes), and a new, large-scale phylogenetic hypothesis for the genera that occur in these ecosystems. We find a marked reduction in the evolutionary diversity of communities at low precipitation. However, unlike species richness, evolutionary diversity does not continually increase with rainfall. Rather, our results show that the greatest evolutionary diversity is found in intermediate precipitation regimes, and that there is a decline in evolutionary diversity above 1,490 mm of mean annual rainfall. If conservation is to prioritise evolutionary diversity, areas of intermediate precipitation that