The three subspecies have separate demographic history
The highly variable levels of genetic diversity in populations from different subspecies hint that the three putative subspecies have separate demographic histories. To test whether they indeed have evolved separately, we built ten demographic models and used the ABC method to select the models that best fit our observed data (Figure 3b). These simulations indicate that model 10 provides the best fit. This model treats the three subspecies as separate lineages, with gene flow betweenA. m. marina and A. m. eucalyptifolia . The posterior probability of this model is 0.3774, much higher than the second-best model 2 (Table 2). Notably, the gene flow between A. m. marinaand A. m. eucalyptifolia allowed in model 10 indicates that these subspecies are not completely isolated, though separate.