Table 4. F-tests and regression coefficients for relationships between imported fire ant mound and surrounding area temperature range and time [percentage of day (x) between sunrise and sunset] at three Mississippi study sites.
| F-test for quadratic trend | ||||||
|---|---|---|---|---|---|---|
| Site ID | Dependent variable | Date | df | F | P | Equation |
| Nobile | Mound range | Spring | 2, 423 | 6.29 | 0.002 | y = 8.23 (±3.83) + 0.60 (±0.18) x – 0.006 (±0.002) x2 |
| Fall | 2, 423 | 9.54 | < 0.0001 | y = 0.18 (±5.13) + 0.80 (±0.21) x – 0.008 (±0.002) x2 | ||
| Surrounding range | Spring | 2, 423 | 6.82 | 0.0012 | y = 5.61 (3.76) + 0.61 (0.18) x – 0.006 (0.002) x2 | |
| Fall | 2, 423 | 9.5 | < 0.0001 | y = −1.68 (±5.01) + 0.81 (±0.20) x – 0.008 (±0.002) x2 | ||
| Clay | Mound range | Spring | 2, 423 | 53.8 | < 0.0001 | y = 6.12 (±2.72) + 1.16 (±0.12) x – 0.011 (±0.001) x2 |
| Fall | 2, 423 | 13.37 | < 0.0001 | y = 11.13 (±3.18) + 0.67 (±0.14) x – 0.007 (±0.001) x2 | ||
| Surrounding range | Spring | 2, 423 | 42.83 | < 0.0001 | y = 6.77 (±2.70) + 0.98 (±0.11) x – 0.009 (±0.001) x2 | |
| Fall | 2, 423 | 10.69 | < 0.0001 | y = 10.76 (±3.14) + 0.57 (±0.14) x – 0.006 (±0.001) x2 | ||
| Levee | Mound range | Spring | 2, 423 | 35.17 | < 0.0001 | y = −2.78 (±3.98) + 1.73 (±0.21) x – 0.018 (±0.002) x2 |
| Fall | 2, 423 | 13.71 | < 0.0001 | y = 3.21 (±3.80) + 0.77 (±0.15) x – 0.007 (±0.001) x2 | ||
| Surrounding range | Spring | 2, 423 | 18.98 | < 0.0001 | y = 0.89 (±3.91) + 1.23 (±0.20) x – 0.013 (±0.002) x2 | |
| Fall | 2, 423 | 12.36 | < 0.0001 | y = 2.25 (±3.75) + 0.71 (±0.15) x – 0.006 (±0.001) x2 | ||