Table 1.

Estimates of parameter values for the low-drift solutions of each clade with 95% confidence intervals in parentheses

CladeGeneNet rate of ecotype formation (Ω)Rate of periodic selection (σ)Rate of drift (d)Ecotypes, no. (n)Ratio of σ:Ω
B. simplex Concat.0.084 (0.026, 0.18)0.57901 (0.083, 4.19)0 (0, 0.70)13 (5, 28)6.89
gapA 0.20 (0.042, 0.44)3.56 (0.24, ∞)0 (0, ∞)11 (3, 40)17.8
rpoB 0.43 (0.19, 0.93)54.16 (1.17, ∞)0 (0, ∞)34 (9, 79)126
uvrA 0.29 (0.060, 0.63)1.28 (0.08 > 100.0)0 (0, ∞)10 (3, 65)4.41
B. subtilis–B. licheniformis Concat.0.028 (0.013, 0.041)0.92 (0.14, 4.55)0 (0, 0.70)17 (9, 27)32.9
gapA 0.083 (0.038, 0.18)2.10 (0.44, 31.33)0 (0, 5.12)10 (6, 20)25.3
gyrA 0.049 (0.036, 0.073)2.54 (0.40, 27.66)0 (0, 1.43)20 (15, 30)51.8
rpoB 0.10 (0.049, 0.16)8.47 (1.34, ∞)0 (0, 39.68)12 (8, 19)84.7
  • See SI for high-drift solutions. The confidence intervals were determined following the method of Felsenstein (see SI) and are indicated in parentheses. The number of ecotypes estimated here tends to be greater than the number of ecotypes demarcated in Fig. 3, because ecotype demarcation is performed conservatively—a clade is deemed an ecotype if the confidence interval of n includes 1, even if the maximum likelihood estimate for n is greater than 1 (SI). Concat., concatenation of three genes.