The phylogenetic information of assemblages carries the signature of ecological and evolutionary processes that assembled these communities. Identifying the mechanisms that shape communities is not simple, as they can vary spatially. Here, we investigated how the phylogenetic structure of Canidae across the globe is affected by the environment and competition. We first identified phylogenetically clustered and overdispersed assemblages of canids over the planet taking into account regional pools of species in South and North America, Eurasia, and Africa. Then, we applied Structural Equation Models in these communities in order to identify the effect of temperature, vegetation cover, human impact, and body size dissimilarity on the spatial distribution of the phylogenetic information of canids. Only southern South America and the Middle East had strong phylogenetic clustered patterns, while the rest of the planet predominantly showed overdispersed assemblages. Body size dissimilarity and vegetation cover were the most important variables to explain the spatial patterns of phylogenetic structure in clustered and overdispersed communities, respectively. Canidae community composition across the world presents significant patterns of clustering and overdispersion, which vary following mainly the environmental gradient, suggesting habitat filtering as the main force acting on Canidae assemblages.

中文翻译：

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全球犬科的竞争和环境梯度结构组合

组合的系统发育信息带有组装这些群落的生态和进化过程的特征。确定塑造社区的机制并不简单，因为它们可能在空间上有所不同。在这里，我们调查了全球犬科的系统发育结构如何受到环境和竞争的影响。考虑到南美洲和北美洲、欧亚大陆和非洲的区域物种库，我们首先确定了地球上犬科动物的系统发育集群和过度分散的组合。然后，我们在这些群落中应用结构方程模型，以确定温度、植被覆盖、人类影响和体型差异对犬科动物系统发育信息空间分布的影响。只有南美洲南部和中东具有强烈的系统发育集群模式，而地球其他地区则主要表现出过度分散的组合。体型差异和植被盖度分别是解释聚集群落和过度分散群落系统发育结构空间格局的最重要变量。世界各地的犬科动物群落组成呈现出显着的聚集和过度分散模式，其主要随环境梯度而变化，表明栖息地过滤是作用于犬科动物组合的主要力量。体型差异和植被盖度分别是解释聚集群落和过度分散群落系统发育结构空间格局的最重要变量。世界各地的犬科动物群落组成呈现出显着的聚集和过度分散模式，其主要随环境梯度而变化，表明栖息地过滤是作用于犬科动物组合的主要力量。体型差异和植被盖度分别是解释聚集群落和过度分散群落系统发育结构空间格局的最重要变量。世界各地的犬科动物群落组成呈现出显着的聚集和过度分散模式，其主要随环境梯度而变化，表明栖息地过滤是作用于犬科动物组合的主要力量。