Using functional and phylogenetic diversity to infer avian community assembly along elevational gradients

Aim We present the first global analysis of elevational gradients in functional and phylogenetic diversity of birds and test for signals of deterministic processes (i.e., environmental filtering and limiting similarity) in community assembly. Further, we examine for latitudinal effects in the strength of these processes.

Location Forty-six elevational gradients across the globe.

Time period Current (between 1924 and 2016)

Major taxa Birds.

Methods We systematically selected, compiled and analyzed published data on bird diversity along elevational gradients. For each gradient, we calculated functional and phylogenetic diversity across elevations and described the main patterns for each diversity metric. Then, we calculated standardized effect sizes (SES) of each metric and used these SES values to (1) test the signals of deterministic processes shaping assemblages across elevations and (2) to compare changes in within-mountain diversity, among mountains located at different l...