Table 2 Regressions of actual median abundance on predicted median abundance (Fig. 4) and median ratios between actual and predicted median abundance based on the fit of six theoretical abundance distributions to the full data set.

The double geometric outperforms all other models with respect to the slope, intercept, and ratio.

DistributionCorrelationSlopeInterceptRatio
Double geometric0.94961.0340−0.00110.9783
Lognormal0.94731.0901−0.00421.0931
Geometric series0.94421.2471−0.00250.8604
Log series0.93391.3473−0.00620.9758
Broken stick0.78010.7689−0.00891.9864
Zipf0.88852.1048−0.00260.5615