不同年龄和性别的美国红尾鸲(Setophaga ruticilla)羽毛类胡萝卜素以及捕捉色素变化的标准颜色指标的可靠性。

IF 1.9 3区 生物学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
Jocelyn Hudon , Kile McKenna , Kingsley Donkor , Sean M. Mahoney , Christopher M. Tonra , Peter P. Marra , Laurene M. Ratcliffe , Matthew W. Reudink
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引用次数: 0

摘要

羽饰是重要的性信号,但这些羽饰在多大程度上是诚实的信号--以及维持诚实的生理机制--仍然鲜为人知。我们研究了美国红尾鸲(Setophaga ruticilla)尾色的色素基础,这是一种具有性二色性和羽色延迟成熟的鸣禽物种;年轻的雄鸟与雌鸟相似,只是在第一个繁殖季节后才将黄色羽毛换成亮橙色羽毛。雌鸟和年轻雄鸟的黄色羽毛和年长雄鸟的橙色羽毛基本上含有相同的色素,但比例却大不相同。雌鸟和幼年雄鸟的羽毛主要含有叶黄素、3'-脱氢叶黄素和金丝雀黄素,而老年雄鸟的羽毛主要含有 4-酮类胡萝卜素。叶黄素和作为 4-酮类胡萝卜素的α-去甲黄素(与红色羽毛中常见的酮类胡萝卜素相比,α-去甲黄素的共轭双键链更短)在老年雄鸟的羽毛中占主导地位,这也是它们呈现不常见的橙色的原因。由于美洲红尾鸲尾部的橙色是由黄色、橙色和红色色素组合而成的,因此在这一系统中,类胡萝卜素沉积类型的微小调整都会显著改变色调。这些因素要么不利于该物种达到最氧化的状态,要么通过稳定选择偏爱的颜色来保持色调。类胡萝卜素色度、可见色调、λR50 和四面体 θ 等颜色指标最能反映色素浓度和组成的差异,建议在未来对类胡萝卜素性状进行分光光度研究时使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Feather carotenoids of the American Redstart (Setophaga ruticilla) across age and sex classes and the reliability of standard color metrics to capture pigment variation

Feather carotenoids of the American Redstart (Setophaga ruticilla) across age and sex classes and the reliability of standard color metrics to capture pigment variation

Plumage ornaments act as important sexual signals, though the extent to which these ornaments act as honest signals—and the physiological mechanisms that maintain honesty—remain poorly understood. We studied the pigmentary basis of tail color in the American Redstart (Setophaga ruticilla), a species of songbird with sexual dichromatism and delayed plumage maturation; younger males resemble females, only replacing their yellow feathers for bright orange ones after the first breeding season. The yellow rectrices of females and young males and the orange feathers of older males largely contain the same pigments, but in vastly different proportions. Whereas the feathers of females and young males contain primarily lutein, 3′-dehydro-lutein and canary-xanthophylls, those of older males contain primarily 4-keto-carotenoids. The presence of lutein and the predominance of α-doradexanthin as 4-keto-carotenoid, a pigment with a shortened chain of conjugated double bonds compared to keto-carotenoids commonly found in red feathers, in the feathers of older males contribute to their uncommon orange hue. Since the orange coloration of the tail in the American redstart results from the combination of yellow, orange, and red pigments, this is a system where slight adjustments in the types of carotenoids deposited could significantly alter hue. Factors either work against achieving the most oxidized state in this species or the hue is maintained through stabilizing selection for a favored color. The color metrics of Carotenoid Chroma, Visible Hue, λR50 and tetrahedral θ best captured differences in pigment concentration and make-up, and are recommended in future spectrophotometric studies of carotenoid-based traits.

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来源期刊
CiteScore
4.60
自引率
4.50%
发文量
77
审稿时长
22 days
期刊介绍: Comparative Biochemistry & Physiology (CBP) publishes papers in comparative, environmental and evolutionary physiology. Part B: Biochemical and Molecular Biology (CBPB), focuses on biochemical physiology, primarily bioenergetics/energy metabolism, cell biology, cellular stress responses, enzymology, intermediary metabolism, macromolecular structure and function, gene regulation, evolutionary genetics. Most studies focus on biochemical or molecular analyses that have clear ramifications for physiological processes.
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