ASV richness
Host was the most important predictor of ASV fungal richness (Table 3), with one host – S. chirindensis – consistently supporting fewer ASVs (mean = 83.94 ± 52.79) than C. inerme (mean = 218.5 ± 95.8) and E. crispa (mean = 245.85 ± 70. 82) (Figure 4). The best subset GLMM model testing the effect of abiotic, biotic and spatial factors on ASV fungal endophyte richness retained light intensity; the interaction between host species and tree height and the interaction between host species and maximum temperature. Both the interactions between host and maximum temperature, and between host and tree height were significant (Figure 4, Table 3). Fungal ASV richness increased as light intensity decreased (Figure 4a). ASV endophyte richness decreased in S. chirindensis individuals that experienced higher maximum temperatures (Figure 4b) but was unaffected by temperature differences experienced by individuals of C. inerme and E. crispa(Figure 4b). Additionally, ASV endophyte richness decreased with tree height for S. chirindensis but did not change with tree height inC. inerme and E. crispa (Figure 4c). Fixed effects explained 63% of variation in ASV richness (Table 3).