Table 4. Time required to measure population change.
Time (years) required to measure a lambda of 1.04, and a doubling or halving of overall population size, from 5 different sampling configurations with traps stationary (S) or moved (M) between capture sessions. Calculations relied on CVs reported in Table 3.
| Sampling configuration | T λ a | Td b | Th c |
|---|---|---|---|
| Grid 7 km (S) | 16 | 19 | 6 |
| Grid 7 km (M) | 19 | 28 | 7 |
| Grid 9 km (S) | 34 | 61 | 17 |
| Grid 9 km (M) | 23 | 43 | 11 |
| Grid 11 km (S) | 48 | 82 | 36 |
| Grid 11 km (M) | 54 | 106 | 41 |
| Targeted (S) | 14 | 13 | 4 |
| Targeted (M) | 12 | 10 | 4 |
| Targeted(1/2) (S) | 21 | 36 | 9 |
| Targeted(1/2) (M) | 15 | 16 | 5 |
Notes.
a
Number of years required to detect a yearly growth rate (λ) of 1.04.
b
Number of years required to detect a doubling of the overall population size.
c
Number of years required to detect a halving of the overall population size.