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Dietary mineral content influences the expression of melanin-based ornamental coloration

机译:膳食中的矿物质含量影响基于黑色素的装饰性色素的表达

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摘要

Many animals develop bold patches of black or brown coloration that are derived from melanin pigments and serve as sexual or social signals. At present, there is much debate among behavioral ecologists over whether melanin-based color signals are costly to produce. Studies that have manipulated crude aspects of nutrition (i.e., total food intake) or health have generally found melanin-based plumage ornaments to be less responsive to such factors than other types of extravagant color (e.g., carotenoid or structural based). However, a recently advanced hypothesis argues that limited minerals in the diet, such as calcium (Ca), zinc (Zn), and iron (Fe), may serve to increase melanin pigment production and maintain signal honesty. Here, I experimentally tested whether variation in the calcium content of the diet affects the color and extent of melanin-based plumage in male zebra finches (Taeniopygia guttata). Calcium supplementation increased the size, but not darkness, of the black breast plumage patch in fledgling and adult males; however, sexually selected, carotenoid-based red beak coloration was not affected by the diet manipulation. These results are the first to support the idea that acquisition of minerals from the diet is a unique, limiting factor for the expression of ornamental melanin coloration in animals.
机译:许多动物会产生黑色或棕色的黑色大胆斑块,这些黑色斑块源自黑色素色素,可作为性或社交信号。目前,行为生态学家之间就基于黑色素的颜色信号的生产成本是否高昂存在着许多争论。操纵营养(即食物总摄入量)或健康状况的主要方面的研究通常发现,与其他类型的奢侈颜色(例如,类胡萝卜素或基于结构的颜色)相比,基于黑色素的羽毛装饰物对此类因素的反应较小。但是,最近的高级假设认为,饮食中有限的矿物质,例如钙(Ca),锌(Zn)和铁(Fe),可能有助于增加黑色素的生成并保持信号诚实。在这里,我通过实验测试了饮食中钙含量的变化是否会影响雄性斑马雀(Taeniopygia guttata)黑色素羽毛的颜色和程度。钙补充剂增加了成年男性和成年男性黑色乳房羽毛斑块的大小,但没有增加黑暗度;但是,按性别选择,基于类胡萝卜素的红喙着色不受饮食控制的影响。这些结果首次支持了从饮食中获取矿物质是动物中表达装饰性黑色素的独特,限制因素的想法。

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  • 来源
    《Behavioral Ecology》 |2007年第1期|137-142|共6页
  • 作者

    Kevin J. McGraw;

  • 作者单位

    School of Life Sciences Arizona State University Tempe AZ 85287-4501 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-18 01:12:04

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