Figure 4.

Molecular clock estimates of lineage divergence times in Sylvia, based on a cyt-b mean rate calibration of 2.1% per million years (see text). Bars at nodes indicate 95% highest posterior density interval. The vertical shaded rectangle indicates the duration of the Mediterranean Salinity Crisis; the end of the MSC marks the end of the Miocene and the beginning of the Pliocene. The vertical dashed line indicates the Plio-Pleistocene boundary. Arrows with "ML" indicate lineages that have lost long-distance migration.