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Nat Commun:美学者报道极乐鸟极黑羽毛的由来

摘要 : 2018年1月9日,国际学术权威刊物自然出版集团旗下子刊《Nature Communication》杂志在线发表了美国哈佛大学Dakota E. McCoy研究员的一篇研究论文,论文揭示了某些极乐鸟极黑的羽毛是由羽毛中的微观结构排列造成的。

2018年1月9日,国际学术权威刊物自然出版集团旗下子刊《Nature Communication》杂志在线发表了美国哈佛大学Dakota E. McCoy研究员的一篇研究论文,论文揭示了某些极乐鸟极黑的羽毛是由羽毛中的微观结构排列造成的。这些微观结构帮助羽毛吸收高达99.95%的直接入射光。 在许多种雄性极乐鸟中,紧挨着明亮彩色的羽毛旁边,还会长着柔软的深黑色羽毛。这些黑色羽毛明显无光泽,而且颜色比一些近亲物种的正常黑色羽毛要深得多。 Dakota McCoy及同事采用分光光度法和扫描电子显微术等技术,研究了结构型吸光可能对7种极乐鸟的黑色羽毛所起的作用,其中5种羽毛极黑,另外2种为正常黑色。作者发现那些极黑的羽毛的羽小支垂直斜排,大大增加了光的散射,导致其反射率只有正常黑色羽毛的百分之一左右。 作者认为之所以演化形成结构型吸光极黑羽毛,是因为它们能够凸显旁边彩色羽毛的亮度,在求偶时帮助吸引潜在配偶。

原文链接:

Structural absorption by barbule microstructures of super black bird of paradise feathers

原文摘要:

Many studies have shown how pigments and internal nanostructures generate color in nature. External surface structures can also influence appearance, such as by causing multiple scattering of light (structural absorption) to produce a velvety, super black appearance. Here we show that feathers from five species of birds of paradise (Aves: Paradisaeidae) structurally absorb incident light to produce extremely low-reflectance, super black plumages. Directional reflectance of these feathers (0.05–0.31%) approaches that of man-made ultra-absorbent materials. SEM, nano-CT, and ray-tracing simulations show that super black feathers have titled arrays of highly modified barbules, which cause more multiple scattering, resulting in more structural absorption, than normal black feathers. Super black feathers have an extreme directional reflectance bias and appear darkest when viewed from the distal direction. We hypothesize that structurally absorbing, super black plumage evolved through sensory bias to enhance the perceived brilliance of adjacent color patches during courtship display.

来源: Nature Communications 浏览次数:0

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