Table 5. Proportions (%) of trajectories that lead to one of the equilibria in stochastic simulations (N = 1000) after 10,000 generations.
| Equilibrium | Descriptiona | Constant environment, weak selection | Constant environment, strong selection | Changing environmentb | Optimum changec | General fitnessd |
|---|---|---|---|---|---|---|
| E1 | Polymorphic/symmetric | 0 | 0 | 0 | 0 | 0 |
| E2 + E3 | Polymorphic/unsymmetric | 0.59 | 3.75 | 0.07 | 0.79 | 0.00 |
| E4 | A polymorphic, loss at B | 38.07 | 32.33 | 27.41 | 26.83 | 1.28 |
| E5 | A polymorphic, fixation at B | 1.56 | 1.25 | 1.62 | 2.09 | 0.05 |
| E6 | Fixation in A, loss at B | 26.48 | 15.77 | 37.39 | 18.15 | 20.40 |
| E7 | Loss at A, fixation at B | 25.97 | 12.08 | 32.14 | 19.23 | 18.86 |
| E8 | Loss at A, loss at B | 0 | 0 | 0 | 0.01 | 15.66 |
| E9 | Fixation at A, fixation at B | 0.46 | 32.94 | 0.40 | 20.66 | 42.19 |
| Sweep at A (fixation in E6)e | 45.39 | 49.21 | 0.4 | 44.3 | 48.48 | |
| Sweep at B (fixation in E5)e | 12.82 | 14.4 | 0 | 22.97 | 40.0 | |
| Sweep at B (fixation in E7)e | 40.35 | 36.67 | 1.56 | 39.16 | 48.57 | |
| Sweep at A and B (fix. in E9)e | 65.22 | 31.36 | 100 | 33.4 | 31.62 | |
| Transient | 0 | 4.09 | 0 | 0 | 0 | |
| Unclassified | 6.87 | 2.21 | 0.97 | 12.24 | 1.56 | |
| Sweeps total | 23.0 | 22.7 | 1.05 | 22.95 | 32.41 |
a
The equilibria E1 to E9 are defined following Bürger (2000, p. 205).
b
Environmental changes were defined by random change of the original effects and selection coefficient.
c
In the shifted optimum model (see Models) the phenotypic optimum takes an arbitrary position 0 < θ < 1.
d
In the general fitness model the effects have arbitrary values sampled from (0, 2) such that A is major locus.
e
Selective sweeps are defined here as trajectories that lead to fixation from very low initial frequencies (<0.01). Numbers denote the proportions of fixations with initial frequencies <0.01.