Global variation in the relationship between avian phylogenetic diversity and functional distance is driven by environmental context and constraints

Aim: If evolutionary distance is akin to evolutionary chance, then it follows that species assemblages that are distantly related will also be more disparate in terms of their traits, features and the niches they occupy. Yet, studies have found that the total phylogenetic distance of an assemblages, known as phylogenetic diversity, is an unreliable surrogate for functional diversity. We investigate global variation in the relationship between Faith’s Phylogenetic Diversity (PD) and Mean Pairwise Functional Distance (MPFD) across latitude and the influence of migratory species on both these aspects of diversity.
Location: Global.
Time period: Present day.
Major taxa studied: Birds.
Methods: We measure PD and MPFD for over 9,000 species of bird across more than 17,000 globally distributed assemblages. We obtain standardised effect sizes for both indices by simulating assemblage composition under an ecologically informed null model. We employ path analysis to characterise variation in the ...

研究目的：若进化距离等同于进化偶然性，则亲缘关系疏远的物种集合，其功能性状、特征及所占据的生态位也会更为迥异。然而已有研究表明，物种集合的总系统发育距离（即系统发育多样性）并不能作为功能多样性的可靠替代指标。本研究旨在探究费思系统发育多样性（Faith’s Phylogenetic Diversity, PD）与平均成对功能距离（Mean Pairwise Functional Distance, MPFD）之间的关系随纬度的全球变化规律，以及迁徙物种对这两类多样性维度的影响。
研究区域：全球范围。
研究时段：当代。
研究类群：鸟类。
研究方法：针对全球分布的17000余个物种集合中的9000余种鸟类，我们对其PD与MPFD进行测算。通过基于生态学原理的零模型模拟物种集合组成，我们得到两个指数的标准化效应量。本研究采用路径分析来刻画...