Table 1.
Comparison between 300- and 50-ant experiments with a morphological transition
| Mean ±SD (number of replicates) | Mann–Whitney test | ||||
|---|---|---|---|---|---|
| Feature | Parameter | 300 ants | 50 ants | U statistics | P value |
| Dynamic | α | 1.71 ± 0.34 (29) | 1.39 ± 0.33 (12) | 72 | 0.003 |
| β | 9.16 ± 4.00 (29) | 12.61 ± 5.76 (12) | 245 | 0.042 | |
| AM | 75.18 ± 42.76 (29) | 20.18 ± 7.99 (12) | |||
| AMNorm | 0.251 ± 0.143 (29) | 0.404±0.160 (12) | 61 | <0.001 | |
| Transition | ω1 | 0.50 ± 0.03 (29) | 0.56 ± 0.05 (12) | 291 | <0.001 |
| ω2 | 1.84 ± 0.83 (29) | 1.55 ± 0.62 (12) | 132 | 0.238 | |
| ATra | 51.99 ± 24.41 (29) | 12.60 ± 6.35 (12) | |||
| ATraNorm | 0.173 ± 0.081 (29) | 0.252 ± 0.127 (12) | 92 | 0.018 | |
| Density* | PTra | 36.47 ± 11.98 (29) | 21.85 ± 8.71 (12) | ||
| ρM | 0.535 ± 0.390 (29) | 0.758 ± 0.908 (12) | 148 | 0.470 | |
| ρ75 | 0.291 ± 0.170 (29) | 0.388 ± 0.448 (12) | 155 | 0.601 | |
| ρ50 | 0.066 ± 0.029 (29) | 0.072 ± 0.050 (12) | 187 | 0.724 | |
| ρTra | 0.038 ± 0.022 (29) | 0.041 ± 0.045 (12) | 202 | 0.436 | |
Boldface font values have been normalized before statistical comparison (see Materials and Methods).
*Reference densities corresponding to specific values of digging rate are calculated chronologically: ρM when rate is maximum (R = RM), ρ75 when R = 0.75RM, ρ50 when R = 0.50RM and ρTra at the transition time.