TABLE 1

Mean Tajima's D and power with fixed θ

N = 2000N = 3000N = 8000
sT (gen)D coal (2 SE)D forw (2 SE)Pow 1 (%)T (gen)D coal (2 SE)D forw (2 SE)Pow 1 (%)T (gen)D coal (2 SE)D forw (2 SE)Pow 1 (%)
0.00350–0.97 (0.04)–1.01 (0.18)2556–0.96 (0.04)–1.05 (0.17)2473–1.02 (0.04)–1.03 (0.23)26
0.00572–1.08 (0.04)–1.26 (0.15)3080–1.11 (0.04)–1.02 (0.19)31102–1.10 (0.04)–1.05 (0.20)23
0.01144–1.20 (0.04)–1.30 (0.16)35165–1.21 (0.04)–1.14 (0.13)35293–1.14 (0.04)–1.03 (0.17)21
0.015325–1.22 (0.04)–0.96 (0.22)33611–1.15 (0.04)–1.11 (0.18)302239–0.90 (0.06)–0.80 (0.18)17
0.021292–1.03 (0.04)–1.15 (0.20)273478–0.91 (0.06)–0.95 (0.28)23–0.55 (0.06)–0.65 (0.23)10
0.03–0.60 (0.06)–0.74 (0.20)13–0.53 (0.06)–0.80 (0.22)12
0.04–0.33 (0.06)–0.29 (0.24)9

The mean values of Tajima's D for different s values (two standard errors are shown below the means), based on forward Monte Carlo simulations (D forw) and coalescent simulations (D coal). Pow 1 is the percentage of coalescent simulations that yielded values of D lower than the critical value (at the 95% probability level) obtained as explained in simulation methods. T is the time between turns of Muller's ratchet calculated from the simulations. —, no clicks were observed in the simulations. Sample size is 25. θ = 2Nμ = 8, for the neutral locus as a whole. The deleterious mutation rate is 0.05.