Fig. 2

TCS haplotype network of Carcinus aestuarii, based on the alignment of 587 bp of the mitochondrial gene Cox1, showing the relationships among the recorded haplotypes. Haplotype 2 corresponds to the ancestral haplotype. Small black circles correspond to missing (or hypothetical) haplotypes. Each line between two points represents one mutational step. Circle sizes depict proportions of haplotypes; the smallest corresponds to 1 and the largest to 67 individuals