Dewlap characteristics
Dewlap reflectance spectra revealed consistent patterns across
populations (Figure S4). Despite individual variation in spectral
characteristics, most lizards showed peak reflectance values between 600
to 700 nm wavelengths (Figure 1a). The relative intensity of UV
wavelengths (300 to 400 nm) varied across individuals; dewlaps with
greater proportions of yellow had higher UV reflectance values.
When comparing PC axes, dewlap reflectance showed strong differentiation
between red and yellow-dewlapped lizards (Figure 1b). PC1 explained
63.7% of the variation, whereas PC2 explained 15.6%. High values of
PC1 corresponded to relatively bright dewlaps, whereas low PC1 values
corresponded to dull dewlaps. As for PC2, high values corresponded to
red dewlaps and low values to yellow ones.