Table 1:
Parameters of the simple simulated test case. We begin with a single population of size N which is allowed to “burn in” for 20N generations so that the populations reach, or at least approach, equilibrium. Then, a split occurs tS generations ago. After some amount of time of complete isolation, which follows the described uniform distribution, a pulse migration event occurs with individuals migrating with a probability also drawn from a uniform distribution. This migration event can occur in either direction or in both directions, and both unidirectional and bidirectional introgression is examined the Results.
| Parameter | Value |
|---|---|
| Simulated chromosome size, L | 100 kb |
| Sub-population size, N | 500 |
| Burn-in time | 20N |
| Split time coefficient, α | 4 |
| Split time ago, tS | αN |
| Migration time (gens ago) | U(0, 0.25tS) |
| Migration probability | U(0.1, 0.5) |
| Mutation rate | 1.0 × 10−5 |
| Recombination rate | 1.0 × 10−5 |
| Sample size, population 1, n1 | 32 |
| Sample size, population 2, n2 | 32 |