Figure 2.

The log of hybrid reports as a function of the log of described species in the respective taxon. Dashed lines represent 95% confidence limits. Residuals of this regression represent either true differences of taxonomic groups or a study bias. In order to test which of the two contributes most to this deviation, we correlated the residuals to the study bias (deviations of a regression of the number of records in the database with the number of the described species). The regression of both residuals resulted in a significant relationship (inset figure).