Table 2. Mean percentage error (%) of individual tolerance (IT) and stochastic death (SD) model when pulsed (PT), constant (CT), or all data was used for calibration of the survival model for Gammarus pulex exposed to imidacloprid.
| Pulsed treatments (PT) | Constant treatments (CT) | ||||||
| Model | Calibration data | Tr A 1(14-day) | Tr B 2(14-day) | Tr A 1(21-day) | Tr B 2(21-day) | Tr C(14-day) | Tr C(21-day) |
| IT | PT alone/CT alone | 5.0 | 3.5 | 3.4 | 3.9 | 5.4 | 2.6 |
| All data | 5.4 | 3.1 | 3.3 | 3.8 | 5.4 | 4.7 | |
| SD | PT alone/CT alone | 8.3 | 7.2 | 23.6 | 13.4 | 5.7 | 4.0 |
| All data | 7.3 | 8.3 | 22.7 | 13.4 | 5.1 | 5.0 | |
1
Pulsed treatment with a short interval in uncontaminated water between imidacloprid pulses.
2
Pulsed treatment with a long interval in uncontaminated water between imidacloprid pulses.