Qian Hong, Qian Shenhua, Zhang Jian, Kessler Michael
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
Research and Collections Center, Illinois State Museum, 1011 East Ash Street, Springfield, IL, 62703, USA.
Nat Commun. 2024 Feb 5;15(1):1079. doi: 10.1038/s41467-024-45155-9.
The tendency of species to retain ancestral ecological distributions (phylogenetic niche conservatism) is thought to influence which species from a species pool can persist in a particular environment. Thus, investigating the relationships between measures of phylogenetic structure and environmental variables at a global scale can help understand the variation in species richness and phylogenetic structure in biological assemblages across the world. Here, we analyze a comprehensive data set including 341,846 species in 391 angiosperm floras worldwide to explore the relationships between measures of phylogenetic structure and environmental variables for angiosperms in regional floras across the world and for each of individual continental (biogeographic) regions. We find that the global phylogenetic structure of angiosperms shows clear and meaningful relationships with environmental factors. Current climatic variables have the highest predictive power, especially on phylogenetic metrics reflecting recent evolutionary relationships that are also related to current environmental heterogeneity, presumably because this favors plant speciation in various ways. We also find evidence that past climatic conditions, and particularly refugial conditions, play an important role in determining the phylogenetic structure of regional floras. The relationships between environmental conditions and phylogenetic metrics differ between continents, reflecting the different evolutionary histories of their floras.
物种保留祖先生态分布的倾向（系统发育生态位保守性）被认为会影响物种库中的哪些物种能够在特定环境中持续存在。因此，在全球范围内研究系统发育结构指标与环境变量之间的关系有助于理解世界各地生物群落中物种丰富度和系统发育结构的变化。在这里，我们分析了一个包含全球391个被子植物区系中341,846个物种的综合数据集，以探讨世界各地区域植物区系以及每个大陆（生物地理）区域中被子植物的系统发育结构指标与环境变量之间的关系。我们发现被子植物的全球系统发育结构与环境因素呈现出清晰且有意义的关系。当前的气候变量具有最高的预测能力，特别是对反映近期进化关系且与当前环境异质性相关的系统发育指标，这可能是因为它以各种方式促进了植物物种形成。我们还发现证据表明，过去的气候条件，尤其是避难所条件，在决定区域植物区系的系统发育结构方面发挥着重要作用。环境条件与系统发育指标之间的关系在各大洲之间存在差异，这反映了它们植物区系不同的进化历史。
