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Appendix S1. (a) Summary data and (b) correlation matrix for measures of tree cover within cultivated sites used in multivariate modelling (n = 19 sites). Correlations are Pearson's r with significance from pairwise tests (* P < 0.05; ** P < 0.01; *** P < 0.001; otherwise non-significant).

Appendix S2. Methods for calculation of individual species densities [reproduced from the methods outlined in the complementary study of Hulme et al., (2013)].

Appendix S3. Abundance of trees recorded in 19 × 1 km2 study sites used in analyses. Summary values of minimum, mean and maximum are calculated only across those sites where the respective tree was recorded.

Appendix S4. Forest-dependent bird species recorded in cultivated sites. Shown are habitat preference (F = forest generalist, FF = forest specialist), number of sites in which each species was recorded, and primary and secondary diet preferences determined from literature searches (Fr = fruits, S = seeds, I = insects and other invertebrates, N = nectar), current IUCN global status (LC = least concern, VU = vulnerable), current estimated population trend (De = decreasing, St = stable, Un = unknown) and whether species is restricted to the Guinea-Congo Forest Biome.

Appendix S5. Univariate tests of three measures of bird species richness in relation to seven measures of tree cover. Each explanatory variable was fitted as a linear term. Significant terms at P < 0.05 were taken forward into multivariate modelling, accounting for correlations between variables (see Methods).

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