Figure 3. Global diversity patterns for passerine birds.

Current global diversity patterns for passerine birds based on distributions obtained from the International Ornithological Committee World Bird List; (a) alpha diversity with highest species diversity coloured red and (b) betadiversity with the Sørensen betadiversity ordination to the right of the map and the Hue-Chroma-Luminance colour scheme below. Note that the Hawaiian Islands could not be included in the colour scheme for b because they could not be included in the ordination of pairwise Sørensen index values.