AIM: Lizard assemblages vary greatly in taxonomic, ecological and phenotypic diversity, yet the mechanisms that generate and maintain these patterns at a macroecological scale are not well understood. We aimed to characterize the ecological and environmental drivers of species richness patterns in the context of macroecological theory for 10 independent lizard radiations. LOCATION: Global. TIME PERIOD: Present day. MAJOR TAXA: Lizards. METHODS: We analysed patterns of species and functional trait diversity in 10 ecologically distinct and widely distributed clades encompassing nearly all known lizard species. Using recently published spatial, phylogenetic, and functional trait datasets, we built spatially explicit structural equation models to ask whether species richness was directly or indirectly related to functional divergence or convergence within communities, and with features of the environment, including measures of productivity, complexity and harshness. RESULTS: Our results show that high species richness is achieved via different pathways in different lizard clades, with both functionally divergent and convergent assemblages harbouring high diversity in different clades. More generally, we also find common, positive effects of temperature, productivity and topography on species richness within lizard clades. MAIN CONCLUSIONS: Thermal constraints, topographic complexity and spatial structuring of functional diversity help explain the presence of highly diverse lizard assemblages, suggesting the importance of environmental filters in shaping present‐day diversity and assemblage structure. Our results show how different pathways to high richness in different clades have contributed to the overall global pattern of species richness in reptiles.

中文翻译：

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生态不同的蜥蜴辐射多样性的替代途径

目的：蜥蜴组合在分类、生态和表型多样性方面差异很大，但在宏观生态尺度上产生和维持这些模式的机制尚不清楚。我们旨在在 10 种独立蜥蜴辐射的宏观生态理论背景下表征物种丰富度模式的生态和环境驱动因素。地点：全球。时间段：现在。主要分类：蜥蜴。方法：我们分析了 10 个生态不同且分布广泛的进化枝中的物种模式和功能性状多样性，包括几乎所有已知的蜥蜴物种。使用最近发布的空间、系统发育和功能特征数据集，我们建立了空间明确的结构方程模型，以询问物种丰富度是否与社区内的功能差异或融合直接或间接相关，并与环境特征有关，包括生产力、复杂性和严酷性的措施。结果：我们的结果表明，高物种丰富度是通过不同蜥蜴进化枝中的不同途径实现的，功能发散和收敛的组合在不同进化枝中具有高度多样性。更一般地说，我们还发现温度、生产力和地形对蜥蜴进化枝内物种丰富度的常见积极影响。主要结论：热限制、地形复杂性和功能多样性的空间结构有助于解释高度多样化的蜥蜴组合的存在，表明环境过滤器在塑造当今多样性和组合结构方面的重要性。我们的研究结果表明，不同进化枝中高丰度的不同途径如何影响爬行动物物种丰富度的整体全球格局。