Table 5. F-tests and regression coefficients for the difference between imported fire ant mound temperature and surrounding area temperature regressed over time [percentage of day (x) between sunrise and sunset] at three Mississippi study sites.
| F-test for quadratic trend | |||||
|---|---|---|---|---|---|
| Site ID | Date | df | F | P | Equation |
| Nobile | Spring | 2, 423 | 3.82 | 0.0226 | y = −0.84 (±1.02) + 0.12 (±0.04) x – 0.001 (±0.0004) x2 |
| Fall | 2, 423 | 7.04 | 0.001 | y = −1.80 (±1.30) + 0.18 (±0.05) x – 0.002 (±0.0004) x2 | |
| Clay | Spring | 2, 423 | 66.53 | < 0.0001 | y = −0.29 (0.77) +_ 0.31 (±0.03) x – 0.003 (±0.0002) x2 |
| Fall | 2, 423 | 29.6 | < 0.0001 | y = −1.01 (±0.86) + 0.25 (±0.03) x – 0.002 (±0.0003) x2 | |
| Levee | Spring | 2, 423 | 58.39 | < 0.0001 | y = −2.59 (±1.08) + 0.51 (±0.05) x – 0.005 (±0.001) x2 |
| Fall | 2, 423 | 6.76 | 0.0013 | y = −1.71 (±1.08) + 0.12 (±0.04) x – 0.001 (±0.0003) x2 | |