Table 3.
Definition of scale-down and redistribution strategies
| Strategy | Type | Name | Initial intervention condition | Threshold(s) to switch to new intervention condition | New intervention condition(s) |
|---|---|---|---|---|---|
| 0 | - | Baseline | No intervention | - | - |
| 1 | - | Constant | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week (e.g. every Tuesday and Friday) | - | - |
| 2 | Scale-down | Half quantity | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week | When wild-type adult male abundance reaches 50% of the initial value | Release in current treatment areas at an initial overflooding ratio of 5:1 twice a week |
| 3 | Scale-down | Quarter quantity | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week | When wild-type adult male abundance reaches 50% and 25% of the initial value | Release in current treatment areas at initial overflooding ratios of 5:1 and 2.5:1 twice a week respectively |
| 4 | Scale-down | Weekly | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week | When wild-type adult male abundance reaches 50% of the initial value | Release in current treatment areas at the initial overflooding ratio of 10:1 once a week (e.g. every Tuesday) |
| 5 | Scale-down | Alternate weeks | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week | When wild-type adult male abundance reaches 50% of the initial value | Release in current treatment areas at the initial overflooding ratio of 10:1 twice every alternate week (e.g. every other week on Tuesday and Friday) |
| 6 | Scale-down | Fortnightly | Release in current treatment areas at the initial overflooding ratio of 10:1 twice a week | When wild-type adult male abundance reaches 50% of the initial value | Release in current treatment areas at the initial overflooding ratio of 10:1 once every two weeks (e.g. every other Tuesday) |
| 7 | Redistribution | Redistribution by quantity | Release in current treatment areas at an initial overflooding ratio of 10:1 twice a week for the first year | After 1 year |
Release in: - Current treatment areas at an initial overflooding ratio of 5:1 twice a week for the second year - New treatment areas at an initial overflooding ratio of 10:1 twice a week for the second year |
| 8 | Redistribution | Redistribution by frequency | Release in current treatment areas at an initial overflooding ratio of 10:1 twice a week for the first year | After 1 year |
Release in: - Current treatment areas at an initial overflooding ratio of 10:1 once a week for the second year - New treatment areas at an initial overflooding ratio of 10:1 once a week for the second year |