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)

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

Pongratz et al. BMC Evolutionary Biology 2003 3:23   doi:10.1186/1471-2148-3-23