In addition, we tested for differences in species richness (rarefied total
species richness, calculated for the largest number of shared individuals,
143) among the study sites (including the primary forests), and for a directional change in the average species density (number of species/point), Shannon diversity index and Berger-Parker dominance index of birds, as well as in the total abundance of birds, along the restoration
gradient (Pearson correlations; details in online Appendix)