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

[https://doi.org/10.5061/dryad.05qfttf8t](https://doi.org/10.5061/dryad.05qfttf8t)

This repository contains the R code necessary to replicate the analyses presented in the associated publication. We have also included summary statistics of each analysis. The original data used in this paper is all publicly available and can be accessed via the Sharing/Access information section below.

## Description of the data and file structure

We include two datasets which summarise the outputs of the analyses conducted for this study:

* functional\_div\_in.csv includes the functional dispersion and principle coordinates of each site analysed, as well as their phylogenetic diversity, mean pairwise phylogenetic distance and the latitude and longitude coordinates of the centroid.
* standerdised\_effect\_sizes.csv – includes for each site the mean ph...