Abstract The Chihuahuan Desert is one of the warm deserts of North America located in the southwestern of the United States and Mexico, and has a remarkable vascular flora of which approximately one third of its species are endemic. This study focuses on establishing whether climate stability was crucial for the continuity of centers of endemism and phylogenetic endemism for vascular plants distributed in this desert. Using the checklist of the vascular plant species, areas of endemism, phylogenetic diversity and phylogenetic endemism were identified and climate change velocity was estimated. A database was compiled to identify current climate preferences and multivariate analyses were used to identify the most significant variables. The relationship between climate velocity, endemism and phylogenetic diversity was determined by regression analyses. Results indicate that the most significant areas of endemism and phylogenetic endemism were in the northwest and the southernmost zones of the Chihuahuan Desert associated with mountains. These areas should be considered important in conservation planning. Velocity of climate change was low in these areas, however low velocity of change was more evident in areas of phylogenetic endemism than in areas of phylogenetic diversity. Probably these areas have acted as refugia in evolutionary time for the vascular plants of the Chihuahuan Desert.

中文翻译：

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气候稳定性对奇瓦环沙漠维管植物特有性的影响

摘要 奇瓦瓦沙漠位于美国和墨西哥西南部，是北美温暖的沙漠之一，拥有丰富的维管植物群，其中约三分之一的物种是地方性的。这项研究的重点是确定气候稳定性是否对分布在该沙漠中的维管植物的特有中心和系统发育特有中心的连续性至关重要。使用维管植物物种清单，确定了特有区域、系统发育多样性和系统发育特有区域，并估计了气候变化速度。编制了一个数据库来确定当前的气候偏好，并使用多变量分析来确定最重要的变量。气候速度之间的关系，通过回归分析确定特有性和系统发育多样性。结果表明，最显着的地方性和系统发育地方性分布在与山脉相关的奇瓦环沙漠的西北部和最南端。这些区域在保护规划中应被视为重要的。这些地区的气候变化速度较低，但系统发育特有地区的低变化速度比系统发育多样性地区更为明显。很可能这些地区在进化时期曾成为奇瓦环沙漠维管植物的避难所。这些区域在保护规划中应被视为重要的。这些地区的气候变化速度较低，但系统发育特有地区的低变化速度比系统发育多样性地区更为明显。很可能这些地区在进化时期曾成为奇瓦环沙漠维管植物的避难所。这些区域在保护规划中应被视为重要的。这些地区的气候变化速度较低，但系统发育特有地区的低变化速度比系统发育多样性地区更为明显。很可能这些地区在进化时期曾成为奇瓦环沙漠维管植物的避难所。