Fig. 1: Geographical distribution of studies included in the meta-analysis.
From: Air pollution disproportionately impairs beneficial invertebrates: a meta-analysis
For each included country (highlighted green), the total number of publications (circled) is shown. Map and centroids (points) for each country used the Natural Earth data set with the R package ‘maps’. The treemaps (produced by the R package ‘treemap’) shown for each country are scaled by the total number of effect sizes and indicate the proportion of effect sizes per pollutant.
