Figure 4. Associations between (A) saturation and the total
concentration of pteridines; (B) hue and the concentration of
drosopterin. Orange-red colored skin had higher concentrations of
drosopterin than other skin colors (C). BL = black; BR = brown, CR =
cream; GR = grey; O =orange, P = pink, R = red, RBR = red-brown, Y =
yellow skin samples (N=180).
Table 1. Association
between total carotenoid, total pteridine and the ratio of carotenoid to
pteridine pigment concentration and environmental and sexual selection
variables (N=186).