Figure 1 Time-calibrated species tree of the shearwaters using a constraint on the root age and a fixed topology. Geological periods and epochs are labeled above the tree. Posterior densities of divergence times are shown below the species tree. Note the speciation peak during the late Pliocene - early Pleistocene. Ancestral ranges were estimated under the DIVALIKE + j model using a dispersal matrix restricting dispersal between areas connected by main historical and present surface ocean currents in BioGeoBEARS and are shown as boxes at nodes and tips coded according to the map (Inset). Posterior estimates of divergence times are summarized in Table S2. Illustrations by Martí Franch are representative shearwater species depicted by their lineages.