As Fig.3 shows, there is also a lack of evidence for Bergmann's hypothesis within the genus Phaethornis, in fact the data shows a slight negative correlation between the two variables. This data, alongside the previous two analyses suggest that Bergmann's rule may not be an adequate way to explain any degree of body size difference between hummingbird species.
Latitude Diversity Gradient
The results for the LDG analysis showed more of a correlation, the analysis examining the relationship between species richness within a genus and the mean latitude of the genus (Fig.4) showed that as absolute latitude increased, the average number of species within genuses decreased, however the relationship was only slight.