Table 4.
Modelled management scenarios that yielding a population growth rate of λ ≈ 1 (i.e., a stable population).
| Management scenario | LJ | HJ | Yearlings | Adults | Sum | λ | |
|---|---|---|---|---|---|---|---|
| (190) | (89) | (122) | (100) | (501) | |||
| unselective | HMR (%) | 30 | 30 | 30 | 30 | 1.01 | |
| No. | 57 | 27 | 37 | 30 | 151 | ||
| NH1 | HMR (%) | 40 | 40 | 25 | 25 | 1.00 | |
| No. | 76 | 36 | 41 | 25 | 168 | ||
| NH2 | HMR (%) | 0 | 80 | 25 | 25 | 0.99 | |
| No. | 0 | 71 | 41 | 25 | 137 | ||
| NH3 | HMR (%) | 100 | 0 | 25 | 25 | 1.00 | |
| No. | 190 | 0 | 41 | 25 | 246 | ||
| Juveniles (unselectively) | HMR (%) | 75 | 75 | 0 | 0 | 0.98 | |
| No. | 142 | 67 | 0 | 0 | 209 | ||
| Light juveniles | HMR (%) | 100 | 0 | 0 | 0 | 1.25 | |
| No. | 190 | 0 | 0 | 0 | 190 | ||
| Heavy juveniles | HMR (%) | 0 | 100 | 0 | 0 | 1.15 | |
| No. | 0 | 89 | 0 | 0 | 89 | ||
| Yearlings | HMR (%) | 0 | 0 | 80 | 0 | 0.97 | |
| No. | 0 | 0 | 98 | 0 | 98 | ||
| Adults | HMR (%) | 0 | 0 | 0 | 100 | 0.97 | |
| No. | 0 | 0 | 0 | 100 | 100 | ||
Harvesting classes are light (LJ) and heavy juveniles (HJ), yearlings and adults. The number of animals within an exemplary population structured according to the stable stage distribution identified under favourable conditions without hunting mortality is given in parenthesis. For each management-scenario the proportion (i.e., the hunting mortality rate, HMR) and the actual numbers of individuals that need to be harvested (No.) to achieve a stable population (i.e., λ ≈ 1) are given as well as the overall sum of individuals over all classes and the exact λ under the respective scenario. The management scenarios light juveniles and heavy juveniles did not result in a stable population even when 100% of the respective individuals were harvested (i.e., λ ≫ 1).