Fig. 5

Bayesian skyline plot for the two genetically defined groups of Carcinus aestuarii, as identified by SAMOVA; a: group 1; b: group 2. Populations, defining both geographic groups, are reported in the results and in Table 5 (K=2). BSP plots showing changes in effective population size (Ne) over time (measured in years before present). The thick solid line depicts the median estimate, and the margins of the blue area represent the highest 95% posterior density intervals