“…To the best of our knowledge, a data set compiling range shifts of species related to contemporary climate change and their corresponding traits does not currently exist. The second approach is to conduct a formal meta‐analysis of study‐level effect sizes for aggregated data from published studies that compared geographic distributions of assemblages (taxonomically related species occurring together in space; Stroud et al., ) sampled in the 20th century prior to climate change with resurveys of distributions after contemporary climate change and then tested whether species traits accounted for heterogeneity in range shifts. Meta‐analysis of aggregated data encompasses a set of rigorous statistical techniques (Glass, ; Koricheva & Gurevitch, ) that have been used to synthesize evidence for over three decades in the social sciences (Hines, Hungerford, & Tomera, ; White, ) and over two decades in ecology (Aguilar, Ashworth, Galetto, & Aizen, ; Jarvinen, ; McKnight, García‐Berthou, Srean, & Rius, ; Myers & Mertz, ; Weber, Stevens, Diniz‐Filho, & Grelle, ).…”