Table 5. Effects of site on pollinator visitation rates and achene output of Chaetanthera renifolia capitula.
| Source of variation | DF | MS | F | P-value |
| Pollinator visitation rate | ||||
| Temperature (covariate) | 1 | 0.00 | 0.66 | 0.423 |
| Site | 1 | 0.01 | 7.83 | 0.008 |
| Error | 32 | 0.01 | ||
| Percentage of achene set | ||||
| Plant size (covariate) | 1 | 774.29 | 2.07 | 0.154 |
| Site | 1 | 218.05 | 0.58 | 0.448 |
| Error | 77 | 374.92 | ||
ANCOVA summary of the effects of site (La Parva and Piedra Numerada) on pollinator visitation rate (visits per flower capitulum/30 min) to Chaetanthera renifolia capitula and achene output. Air temperature (20 cm above soil surface) was entered as a covariate. Significant effects are indicated in bold.