Co-distributed species may exhibit similar phylogeographic patterns due to shared environmental factors or discordant patterns attributed to the influence of species-specific traits. Although either concordant or discordant patterns could occur due to chance, stark differences in key traits (e.g., dispersal ability) may readily explain differences between species. Multiple species' attributes may affect genetic patterns, and it is difficult to isolate the contribution of each. Here we compare the relative importance of two attributes, range size and niche breadth, in shaping the spatial structure of genetic variation in four sedge species (genus Carex) from the Rocky Mountains. Within two pairs of co-distributed species, one species exhibits narrow niche breadth, while the other species has broad niche breadth. Furthermore, one pair of co-distributed species has a large geographical distribution, while the other has a small distribution. The four species represent a natural experiment to tease apart how these attributes (i.e., range size and niche breadth) affect phylogeographic patterns. Investigations of genetic variation and structure revealed that range size, but not niche breadth, is related to spatial genetic covariation across species of montane sedges. Our study highlights how isolating key attributes across multiple species can inform their impact on processes driving intraspecific differentiation. This article is protected by copyright. All rights reserved.

中文翻译：

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测试哪些物种分化轴是山地莎草物种系统地理相似性协方差的基础

由于共同的环境因素或归因于物种特定性状影响的不一致模式，共同分布的物种可能表现出相似的系统地理学模式。尽管偶然可能会出现一致或不一致的模式，但关键特征（例如，传播能力）的明显差异可能很容易解释物种之间的差异。多个物种的属性可能会影响遗传模式，并且很难分离每个物种的贡献。在这里，我们比较了两个属性的相对重要性，范围大小和生态位宽度，在塑造落基山脉四种莎草物种（苔藓属）的遗传变异空间结构方面。在两对共同分布的物种中，一个物种的生态位宽度窄，而另一个物种的生态位宽度宽。此外，一对共分布种地理分布大，另一对分布小。这四个物种代表了梳理这些属性（即范围大小和生态位宽度）如何影响系统地理学模式的自然实验。遗传变异和结构的研究表明，范围大小，而不是生态位宽度，与山地莎草物种的空间遗传协变有关。我们的研究强调了分离多个物种的关键属性如何影响它们对驱动种内分化的过程的影响。本文受版权保护。版权所有。范围大小和生态位宽度）影响系统地理学模式。遗传变异和结构的研究表明，范围大小，而不是生态位宽度，与山地莎草物种的空间遗传协变有关。我们的研究强调了分离多个物种的关键属性如何影响它们对驱动种内分化的过程的影响。本文受版权保护。版权所有。范围大小和生态位宽度）影响系统地理学模式。遗传变异和结构的研究表明，范围大小，而不是生态位宽度，与山地莎草物种的空间遗传协变有关。我们的研究强调了分离多个物种的关键属性如何影响它们对驱动种内分化的过程的影响。本文受版权保护。版权所有。