Figure 2

Phylogenetic relationships among haplotypes of M. laminarioides and their geographic distribution based on COI and rbc L. Haplotype networks for the markers COI (A ) and rbcL (B), and pie charts showing the geographical distribution of haplotypes (C). In the networks, each circle represents a haplotype and its size is proportional to the frequency in which the haplotype was encountered in each population (correspondence between circle sizes and numbers of individuals is indicated in the box B). Black squares represent hypothetical un-sampled haplotypes. For haplotypes separated by more than one mutational step, the number of steps is indicated by black bars (for values < 7), or by a number of base pairs, bp (for values ≥ 7). Pie charts’ color-code corresponds to the one used in haplotype networks. Abbreviations for population codes are as in Table 1. Numbers of sequenced individuals are given between brackets. See Additional files 1 and 3 for details.