Hyperspectral imaging of cuttlefish camouflage indicates good color match in the eyes of fish predators
Hyperspectral imaging of cuttlefish camouflage indicates good color match in the eyes of fish predators
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DOI：
10.1073/pnas.1019090108
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发表时间：
2011-05-31
影响因子：
11.1
通讯作者：
Hanlon, Roger T.
中科院分区：
文献类型：
--
作者：
Chiao, Chuan-Chin;Wickiser, J. Kenneth;Hanlon, Roger T.
露营是自然界中普遍存在的现象，也是自然选择中一种重要的反捕食策略。许多视觉捕食者具有敏锐的色彩感知能力，因此伪装图案除了提供其他视觉因素如图案、对比度和纹理外，还应提供一定程度的色彩匹配。从生物学和光学成像技术的角度来看，量化捕食者眼中的伪装效果是一个挑战。在这里，我们利用高光谱成像（HSI），记录全光谱光数据，同时可视化的颜色匹配和模式匹配的光谱和空间域，分别。乌贼可以在任何天然基质上动态伪装自己，尽管它们是色盲，但当人类直接观察或使用RGB图像时，它们的身体图案似乎与基质具有高保真的颜色匹配。使用HSI在自然背景上对活的老化墨鱼进行成像，随后的光谱分析显示，个体墨鱼和基质的大多数反射光谱是相似的，从而使颜色匹配成为可能。对乌贼的二色和三色捕食者的颜色视觉建模证实了光谱匹配分析，并证明了在捕食者眼中，养殖的乌贼表现出良好的颜色匹配以及模式匹配。这些发现（i）表明HSI技术在加强生物着色研究方面的强大潜力，（ii）提供了支持性证据，表明乌贼尽管缺乏色觉，但可以在天然基质上产生颜色协调的伪装。
Camouflage is a widespread phenomenon throughout nature and an important antipredator tactic in natural selection. Many visual predators have keen color perception, and thus camouflage patterns should provide some degree of color matching in addition to other visual factors such as pattern, contrast, and texture. Quantifying camouflage effectiveness in the eyes of the predator is a challenge from the perspectives of both biology and optical imaging technology. Here we take advantage of hyperspectral imaging (HSI), which records full-spectrum light data, to simultaneously visualize color match and pattern match in the spectral and the spatial domains, respectively. Cuttlefish can dynamically camouflage themselves on any natural substrate and, despite their colorblindness, produce body patterns that appear to have high-fidelity color matches to the substrate when viewed directly by humans or with RGB images. Live camouflaged cuttlefish on natural backgrounds were imaged using HSI, and subsequent spectral analysis revealed that most reflectance spectra of individual cuttlefish and substrates were similar, rendering the color match possible. Modeling color vision of potential di- and trichromatic fish predators of cuttlefish corroborated the spectral match analysis and demonstrated that camouflaged cuttlefish show good color match as well as pattern match in the eyes of fish predators. These findings (i) indicate the strong potential of HSI technology to enhance studies of biological coloration and (ii) provide supporting evidence that cuttlefish can produce color-coordinated camouflage on natural substrates despite lacking color vision.