Table S1.
Spatial neighborhood analysis assessing the exclusion effect of A. mexicanum on understory trees at the LTS
| Site | n | Tree/A. mexicanum | Tree/tree |
| A | 45 | 1.10 | 0.86 |
| AA | 36 | 0.99 | 1.00 |
| B | 22 | 1.17 | 0.62 |
| BB | 20 | 1.04 | 1.02 |
| C | 44 | 1.03 | 0.76 |
| CC | 57 | 1.33 | 0.88 |
| D | 50 | 1.18 | 0.75 |
| DD | 33 | 0.93 | 0.97 |
| Mean (SE) | 1.10 (0.045) | 0.86 (0.05) | |
Clark and Evans DI [modified by Donelly (61)] was calculated for each of eight permanent plots in 2013 considering trees with DBH ≤ 5 cm and stemmed palms. DI was calculated as the ratio between observed mean distance (ro) between a tree and a palm and between trees and the mean distance expected by random dispersion (re; Methods); DI > 1 indicates overdispersion, DI = 1 indicates random dispersion, and D < 1 indicates a clumped distribution. The last row shows the overall mean DI value (±SE). A parametric t test reveals a significant overdispersed spatial distribution between trees and palms (t = −2.22, df = 6, P < 0.05) and a clumped distribution between trees (t = 2.8, df = 6, P < 0.01).