a–d, Blue points represent the observed growth of individual trees, and blue triangles the species mean growth in a plot. The solid blue line is the modelled species response to resin phosphate, and the dashed black line is the fixed response of the entire community (as in Fig. 1). The four species are among the most abundant and widespread in the two size classes: Faramea occidentalis (Rubiaceae), an understory evergreen tree/shrub (a); Sorocea affinis (Moraceae), an understory deciduous tree (b); Gustavia superba (Lecythidaceae), an understory tree (c); and Alseis blackiana (Rubiaceae), a canopy tree (d). Saplings (a, c) include all individuals ≥ 10 mm and <50 mm dbh; the dashed black line is the community-wide estimate at 30 mm dbh. Trees (b, d) include all individuals ≥ 100 mm dbh; the dashed black line is the community-wide estimate at the mean dbh of all trees ≥ 100 mm dbh. Both the y axes (growth in mm y−1) and x axes (resin phosphate in mg P kg−1) are plotted on logarithmic scales. The number of individuals were: 398 saplings (F. occidentalis), 328 saplings (S. affinis), 620 trees (G. superba) and 253 trees (A. blackiana).