Phylogenetic conservatism and biogeographic affinity influence woody plant species richness-climate relationships in eastern Eurasia

Mechanisms underlying species richness patterns remain a central yet controversial issue in biology. Climate has been regarded as a major determinant of species richness. However, the relative influences of different evolutionary processes, (i.e. niche conservatism, diversification rate, and time for speciation) on species richness-climate relationships remain to be tested. Here, using newly compiled distribution maps for 11,422 woody plant species in eastern Eurasia, we estimated species richness patterns for all species and for families with tropical and temperate affinities separately, and explored the phylogenetic signals in species richness patterns of different families and their relationships with contemporary climate and climate change since the Last Glacial Maximum (LGM). We further compared the effects of niche conservatism (represented by contemporary-ancestral climate niches differences), diversification rate and time for speciation (represented by family age) on variation i...

物种丰富度格局背后的形成机制，始终是生物学领域核心且颇具争议的议题。气候长期以来被视为调控物种丰富度的核心驱动因素。然而，不同进化过程（即生态位保守性（niche conservatism）、分化速率（diversification rate）与物种形成时间（time for speciation））对物种丰富度-气候关系的相对影响，仍有待实证检验。本研究依托新整合的欧亚大陆东部11422种木本植物的分布数据，分别估算了全部物种以及具有热带、温带亲缘关系的科的物种丰富度格局，并探究了不同科的物种丰富度格局中的系统发育信号（phylogenetic signals），及其与现代气候、末次盛冰期（Last Glacial Maximum, LGM）以来气候变化的关联。本研究进一步比较了生态位保守性（以现代与祖先气候生态位差异为表征）、分化速率与物种形成时间（以科的起源时长为表征）对变异的影响。