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- W1823641521 abstract "ABSTRACT Vertebrate pigmentation is known to be influenced by oxidative stress, but few studies have tested the hypothesis that structural coloration can be similarly affected. We tested whether fish iridophores, which produce structural color using guanine stacks, might be affected by the prooxidant–antioxidant balance of the animal. Specifically, we hypothesized that convict cichlids ( Amatitlania nigrofasciata ) metabolize guanine present in iridophores to uric acid, an antioxidant, in response to oxidative damage. We used Hunter's contrast gloss and high performance liquid chromatography to determine whether dietary guanine supplementation allows fish to maintain their structural coloration despite oxidative stress induced via ultraviolet‐B (UV‐B) radiation. We found that dietary guanine was associated with greater skin gloss, and that exposure to UV‐B light reduced glossiness. UV‐B exposure did not increase oxidative damage (acrolein) or total antioxidant capacity in the skin or liver. Our experiment did not detect effects of dietary guanine or UV‐B light on uric acid, but uric acid was positively related to antioxidant capacity. Our results support the hypothesis that structural color in fish may be altered by environmental stressors such as exposure to UV light, and highlight the need for future studies to consider the role of iridophores in condition‐dependent visual signaling. J. Exp. Zool. 323A: 359–367, 2015 . © 2015 Wiley Periodicals, Inc." @default.
- W1823641521 created "2016-06-24" @default.
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- W1823641521 date "2015-04-06" @default.
- W1823641521 modified "2023-10-12" @default.
- W1823641521 title "Guanine-based structural coloration as an indicator of oxidative stress in a cichlid fish" @default.
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- W1823641521 doi "https://doi.org/10.1002/jez.1926" @default.
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