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Fig. 2 | BMC Evolutionary Biology

Fig. 2

From: The soft explosive model of placental mammal evolution

Fig. 2

Simulating error-shift inflation of deep placental divergences, and amelioration by excluding calibrations among large, long-lived clades. a. Dated tree on which 20,000 bp DNA sequences were simulated under two rate schemes, “ancestral rates” with all branch rates drawn from a single lognormal distribution (see Methods) and “mixed rates” with the rate drawn from that same distribution, except divided by 5 for the daughter lineages of nodes I and III. b. Soft bound calibrations on nodes I-VI under alternative MCMCtree reconstructions. Date estimates and 95% CIs for simulated clades c “Placentalia” d “Laurasiatheria” and e “Sirenia” are shown for the “ancestral rates” simulation (light grey), and for the “mixed rates” simulation with either full calibration (black) or calibration only on ancestral rates clades (dark grey). Corresponding date estimates from Phillips ([11], Fig. 4c,d) on the empirical data are shown for f Placentalia, g Laurasiatheria and h Sirenia, with full calibration (black) and largely focusing on ancestral rates clades (dark grey)

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