Fig. 3.
Correlations between diversification dynamics and two putative causes of rate variation: body mass evolution and climatic changes. (A) The evolution of body sizes in North American canids shows a temporal trend toward larger sizes. Each line shows the reconstructed life span of a species obtained from one of 100 replicated analyses. (B) Changes in body mass across species do not correlate with variations in speciation and extinction rates, as shown by the posterior estimate of the correlation parameters αλ and αμ (as they do not differ significantly from 0). (C) Relative global temperature curve, based on oxygen isotopes (30), used as a proxy for environmental changes. (D) Temperature variation does not correlate with speciation and extinction rates with the exception of a significant negative correlation with the extinction rate of Borophaginae. (B and D) Color codes similar to the legend on A. Histogram with filled color denotes significant correlation, based on the 95% CI.