… proposes that melanin ornaments signal competitive abilities via the effects of testosterone
(… increases in male melanization, and melanin dichromatism correlated with increases in T in …

… production of melanin pigments. These include the role of (i) metals, (ii) amino acids, and
(iii) testosterone and social interactions in shaping the extent and intensity of melanin-colored …

… Our results suggest that increases in physiological testosterone levels promote a reduced
expression of a melanin-based signal in concordance with CMI response results in this study. …

… the expression of melanin-based traits, here we manipulated the level of yolk testosterone in
… well-known melanin-based signal. We predicted that fledglings hatched from eggs with high …

… to production of black, presumably melanin-pigmented body feathers (… melanin pigmentation
and PC2 as a measure of carotenoid pigmentation and body morphology (including melanin…

… The present research was designed to study the effect of testosterone on the melanocytcs
and melanin in the skin of the car, anterior abdominal wall, arcola and sole of the foot in pure …

… Here we examined whether melanin-based traits are related to circulating testosterone in
the barn owl (Tyto alba). This bird displays a pronounced variation in the degree of reddish-…

… their diet to maintain high levels of testosterone. Nutritional studies reveal several other
links between melanin production and nutrition. Melanin synthesis depends on the oxidation of …

… To determine whether a phenomenon such as deposition of melanin (in the case of the
sparrow bill under the control of androgenic hormone) can be influenced by direct (local) …

… The effects of testosterone on melanocyte number, morphology, melanin content and
tyrosinase activity were studied in epidermis from several body regions of the blackpelted Long-…