Fig. 1: The relationship between range size of individual species and phenomenological estimate of tip diversification rate (DR metric) for all mammals considered together and for large mammalian orders separately.
From: The relationship between geographic range size and rates of species diversification
The statistical significance and the slope parameter estimates are given both for phylogenetic (phy) and standard (std) linear model, and Pagel lambda estimate is provided for the phylogenetic model. Statistical significance provided by both phylogenetic and standard linear model is based on comparing t-statistic of the estimated regression slope against the two-sided Student distribution assuming zero slope. The mean estimate of the slope is negative in all the cases under both standard and phylogenetic linear model. Only the regression lines with slopes different from 0 at p < 0.05 are shown. Note that the phylogenetic linear models systematically underestimate the DR values, which is related to the definition of DR metric and its interference with phylogenetic autocorrelation. For details on this behavior, and also bootstrap envelopes around the regression estimates, see Supplementary Fig. 1. The analyses were performed on log-transformed data and both axes have logarithmic scale. The animal contours are adapted from the PhyloPic database (www.phylopic.org). Source data are provided as a Source Data file.
