Table 4 Statistical support for alternative hypotheses on Schmidtea phylogenetic relationships. (SH, Shimodaira-Hasegawa test: Comparison between the constrained and unconstrained (first, Bayesian) solution)
Tree | - Log likelihood | Δ-Log likelihood | p (SH) |
|---|---|---|---|
Unconstrained Bayesian tree (Fig.2) | 1432.3 | (best) | Â |
Single origin for all parthenogens (3x + 4x) | 1525.1 | 92.8 | < 0.001 |
Single origin for all triploid S. polychroa | 1550.0 | 117.7 | < 0.001 |
Single origin for all tetraploid S. polychora | 1556.3 | 124.0 | < 0.001 |