A full understanding of the origin and maintenance of β-diversity patterns in a region requires understanding of: (1) the relationships of both taxonomic and phylogenetic β-diversity (TBD and PBD, respectively) and their respective turnover and nestedness components with geographical and environmental distances; (2) the relative importance of the turnover and nestedness components of β-diversity; and (3) the relationships between PBD measures representing different evolutionary depths. Here, we investigate all these aspects of β-diversity simultaneously for freshwater fishes in North America.

中文翻译：

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北美淡水鱼群的分类学和系统发育β多样性与地理和气候决定因素的关系

全面了解一个地区β-多样性模式的起源和维持需要了解：（1）分类学和系统发育β-多样性（分别为TBD和PBD）及其各自的周转和嵌套成分与地理和环境距离；(2) β-多样性的周转和嵌套分量的相对重要性；(3)代表不同进化深度的PBD测度之间的关系。在这里，我们同时调查了北美淡水鱼类 β 多样性的所有这些方面。