欧亚大陆东部毛茛科植物多样性格局及主导因子

Patterns and environmental drivers of Ranunculaceae species richness and phylogenetic diversity across eastern Eurasia

毛茛科是真双子叶植物的基部类群之一,包含多种药用植物,具有较高的保护价值,但关于毛茛科物种多样性和谱系多样性大尺度格局及其影响因子的研究还比较匮乏,特别是以较高分辨率分布数据为基础的物种多样性格局研究尚未见报道。本文旨在:(1)建立欧亚大陆东部毛茛科植物分布数据库,估算不同生活型物种多样性和谱系多样性格局,并探究格局的形成机制。(2)分析毛茛科物种多样性和谱系多样性的相关关系,确定多样性热点地区,为毛茛科保护规划提供依据。根据中国、哈萨克斯坦、吉尔吉斯斯坦、塔吉克斯坦、土库曼斯坦、乌兹别克斯坦、蒙古和俄罗斯等国家的区域和地方植物志,建立了"欧亚大陆东部地区毛茛科物种分布数据库"。该数据库包含了欧亚大陆东部地区1,688种毛茛科物种的分布数据,空间分辨率为100 km×100 km。在此基础上,估算了毛茛科全部及不同生活型的物种多样性和谱系多样性格局,并利用广义线性模型和等级方差分离方法分析了毛茛科物种和谱系多样性格局与环境因子的关系。最后比较了物种多样性和谱系多样性的相关关系,确定了毛茛科的古热点地区。结果显示:(1)欧亚大陆东部毛茛科植物物种和谱系多样性均呈明显的纬度格局,且在山区具有较高的多样性。(2)毛茛科植物物种和谱系多样性受现代气候、地形异质性和末次冰期以来的气候变化的共同影响,但不同影响因子的相对贡献率在物种和谱系多样性及不同生活型之间差异显著。(3)中高纬度地区的谱系多样性高于给定物种数的预期,是毛茛科的古热点地区,在毛茛科保护规划中应受到重视。

Aims:Ranunculaceae,one of the basal clades in eudicots of angiosperms,has a variety of medicinal plants and is of high conservation value.However,large-scale patterns in species richness and phylogenetic diversity of Ranunculaceae based on high-resolution distribution data and their environmental determinants remain poorly understood.We aims to:(1)establish a Ranunculaceae distribution database in eastern Eurasia,estimate the species diversity and phylogenetic diversity pattern of different life forms,and explore the formation mechanism of the pattern;(2)analysis the relationship between species diversity and phylogenetic diversity of Ranunculaceae,and determine the diversity hot spots to provide basis for Ranunculaceae conservation planning.Methods:Here,we established the first species distribution database for 1,688 Ranunculaceae species across eastern Eurasia by compiling distribution data from regional and local floral records from across China,Kazakhstan,Kyrgyzstan,Tajikistan,Turkmenistan,Uzbekistan,Mongolia,and Russia at a spatial resolution of 100 km×100 km.Using this database,we mapped large-scale patterns in species richness and phylogenetic diversity for species with different life forms and explored the mechanisms underlying these patterns.We also quantified the relationship between species richness and phylogenetic diversity and identified hotspots of Ranunculaceae phylogenetic diversity.Results:We found a latitudinal gradient in both species richness and phylogenetic diversity and revealed that Ranunculaceae in eastern Eurasia have particularly high levels of species and phylogenetic diversity in mountainous areas.Contemporary climate,habitat heterogeneity,and climate changes since the Last Glacial Maximum(LGM)all influenced spatial patterns in species richness and phylogenetic diversity,but their relative contributions varied across life forms.Phylogenetic diversity at mid and high latitudes was higher than expected when controlling for species richness,which suggests that these latitudes may represent a paleo-biodiversity hotspot of Ranunculaceae.Conclusion:Consequently,these regions should be considered a key conservation priority for this important family.