Figure 1

Heterochronous haplotype network for ancient (in red) and modern Calonectris shearwaters (the only haplotype shared between the two sister taxa, Cory’s and Scopoli's shearwaters, is indicated in bright blue). The five haplotypes shared between the two-epoch levels are connected. Small empty ellipses represent haplotypes from one level projected on the opposing haplotype network, then providing a visual representation of the genetic diversity change through time. Black dots represent mutational steps.