Abstract
ABSTRACT Individual capacity to invest in a reproductive attempt may change over the breeding season, and such changes may be evaluated by potential partners through signaling mechanisms. Coloration of bare parts, such as exposed skin on the throat (gular skin) or feet, is common among avian species and has the potential to be a dynamic, honest signal of current condition, especially when such coloration is carotenoid-dependent. However, few studies have evaluated the repeatability of dynamic coloration of bare parts in the wild. We determined the presence of carotenoid pigments (lutein, zeaxanthin, 13-cis-beta-carotene, and trans-gamma-carotene) in gular skin samples of male and female Brown Boobies (Sula leucogaster) using high performance liquid chromatography (HPLC). We then studied color and perceived color variation in the gular skin of both sexes over the reproductive season, from courtship through parental care. We estimated color using Endler's segment method and perceived color using a tetrahedr...
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