Few studies have incorporated the evolutionary insights provided by analysis of phylogenetic structure along with community composition to assess the effects of exotic invasion on freshwater wetlands. Here, we assess the taxonomic and phylogenetic relationships among acid seep springs to investigate the potential homogenization or resistance of communities due to invasion of an exotic grass. Multivariate community analyses indicated differences in community and phylogenetic composition and dispersion among acid seep springs, associated with gradients in soil moisture, canopy cover, and phylogenetic diversity. By contrast, univariate analyses showed differences in taxonomic diversity but not phylogenetic diversity among acid seep springs. Despite exotic invasion, individual acid seep springs remained taxonomically and phylogenetically distinct from each other. Taxonomic and phylogenetic diversity metrics revealed different aspects of composition, reinforcing the importance of including both in analyses of plant communities for understanding community assembly following exotic invasion and for management purposes. Within acid seep springs, taxonomic and phylogenetic composition appear to be driven more through environmental filtering by light and moisture than by the competitive effects following invasion of an exotic grass in support of Elton’s biotic resistance hypothesis.

中文翻译：

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分类学和系统发育组成显示对酸渗透泉水的外来入侵具有生物抵抗力。

很少有研究结合系统发育结构分析和群落组成提供的进化见解来评估外来入侵对淡水湿地的影响。在这里，我们评估了酸渗泉之间的分类学和系统发育关系，以调查由于外来草入侵而引起的社区潜在的均质化或抗性。多变量群落分析表明，酸渗透泉之间的群落和系统发育组成及扩散差异，与土壤水分，冠层覆盖和系统发育多样性的梯度有关。相比之下，单变量分析表明，酸渗泉之间的分类学多样性不同，但系统发育多样性没有差异。尽管受到异国入侵，各个酸渗泉在分类学和系统发育上都彼此不同。分类学和系统发育多样性指标揭示了组成的不同方面，从而加强了将其纳入植物群落分析的重要性，以了解外来入侵后的群落组装和管理目的。在酸性渗泉中，分类学和系统发育的组成似乎更多地是受光和水分的环境过滤作用所驱动，而不是由外来草入侵以支持Elton的生物抗性假设所产生的竞争效应所驱动。强调了在植物群落分析中包括在内的重要性，以了解外来入侵后的群落组装以及用于管理目的。在酸性渗泉中，分类学和系统发育的组成似乎更多地是受光和水分的环境过滤作用所驱动，而不是由外来草入侵以支持Elton的生物抗性假设所产生的竞争效应所驱动。强调了在植物群落分析中包括两者的重要性，以了解异国入侵后的群落组装以及出于管理目的。在酸性渗泉中，分类学和系统发育的组成似乎更多地是受光和水分的环境过滤作用所驱动，而不是由外来草入侵以支持Elton的生物抗性假设所产生的竞争效应所驱动。