Species richness and patterns of overdispersion, clustering and randomness shape phylogenetic and functional diversity-area relationships in habitat islands

Aim: To evaluate how the area of ​habitat island systems influences multiple facets of diversity. 

Location: Southern Brazil. 

Taxon: Birds. 

Methods: Using an Information Theoretic approach, we compared the fit of 20 diversity–area relationship (DARs) models in three habitat island systems. We tested for the best-fit model, model-family, shape, and presence/absence of an asymptote. We used species richness (SR), Faith's phylogenetic diversity (PD) and Faith's functional diversity (FD) to assess species–area (SARs), phylogenetic (PDARs) and functional diversity–area relationships (FDARs). We controlled for the effect of SR in PD and FD via null models to assess PDARs and FDARs independently of SR and to explore the influence of phylogenetic and functional randomness, clustering and overdispersion. 

Results: PDARs and FDARs built with PD and FD resembled SARs and were all best fitted by convex or sigmoidal, upwards oriented, non-asymptotic models. Controlling for SR in divers...

研究目的：评估栖息地岛屿系统（habitat island systems）的面积如何影响生物多样性的多个维度。

研究区域：巴西南部。

研究类群：鸟类（Birds）。

研究方法：采用信息论方法（Information Theoretic approach），在三类栖息地岛屿系统中对比20种多样性-面积关系（diversity–area relationship, DARs）模型的拟合优度。我们对最优拟合模型、模型族、曲线形态以及渐近线的存在性进行了检验。我们以物种丰富度（species richness, SR）、费思系统发育多样性（Faith's phylogenetic diversity, PD）以及费思功能多样性（Faith's functional diversity, FD）为评估指标，分别构建种-面积关系（species–area relationships, SARs）、系统发育多样性-面积关系（phylogenetic diversity–area relationships, PDARs）与功能多样性-面积关系（functional diversity–area relationships, FDARs）。我们通过零模型（null models）控制物种丰富度对系统发育多样性与功能多样性的影响，从而在独立于物种丰富度的前提下评估PDARs与FDARs，并探究系统发育与功能的随机性、聚集性以及过度分散性的影响。

研究结果：基于PD与FD构建的PDARs与FDARs与SARs特征相似，且均能被凸形或S形、向上倾斜且无渐近线的模型最优拟合。在多样性指标中控制物种丰富度的效应后……