Fig. 4
From: Causations of phylogeographic barrier of some rocky shore species along the Chinese coastline
Bayesian skyline plots (BSP) for Siphonaria japonica. All COI sequences of S. japonica were divided into two groups: northern group (a) and southern group (b), according to the phylogenetic analyses (See the results in the phylogenetic analysis). The black line represents median population estimates; the upper and lower limits of light blue shading represent the 95 % confidence intervals. The gray rectangles represent the glacial stages of various oxygen isotope stages [42, 43] in (c)