Figure 3

Alternative scenarios for coalescent population growth analysis performed using Beast v1.4.8. ESS indicates effective sample size of the MCMC output, considered satisfying in a genealogy sampling when superior to 200 (Kuhner, 2009); tmrca, time to the most recent common ancestor expressed in number of mutations per site since present time. Log is harmonic mean likelihood is calculated as in Drummond et al. (2006), Bayes Factor is calculated as in Kass and Raftery (1995) with modification from Suchard et al. (2001) and tends to favour the monophyletic model.