Mechanisms and measurements

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Dietary mineral content influences the expression of melanin-based ornamental coloration (2007, unknown): “[Behav Ecol 18:137–142 (2007)] The striking colors of birds have emerged as model systemsfor studying the information content and value of social and sexual signals in animals (Hill and McGraw 2006a,b).”
Direction and strength of selection by predators for the color of the aposematic wood tiger moth (2011, background): “Color vision in birds stems from the 4 single cone types (Cuthill 2006), whereas luminance-based tasks apparently stem from the double cones (Osorio and Vorobyev 2005).”
Availability of nonpigmentary antioxidant affects red coloration in gulls (2008, background): “…specific carotenoid coloration is produced through metabolic pathways that modify dietary carotenoids (Fox and Hopkins 1966; Stradi et al. 2001; Hill and McGraw 2006; Hudon et al. 2007), thereby producing a release in ROS, such as those catalyzed by cytochrome P450 (Paolini et al. 1999; Lewis…”
Female European green lizards (Lacerta viridis) prefer males with high ultraviolet throat reflectance (2010, methodology): “We calculated four variables describing throat colour (see e.g. Hill and McGraw 2006): (1) UV brightness, the total reflectance from 320 to 400 nm, (2) blue brightness, the total reflectance from 400 to 490 nm, (3) UV chroma (relative UV intensity), the percent of reflectance measured in the UV…”