Quantification of cuttlefish (Sepia officinalis) camouflage: a study of color and luminance using in situ spectrometry
Quantification of cuttlefish (Sepia officinalis) camouflage: a study of color and luminance using in situ spectrometry
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DOI：
10.1007/s00359-012-0785-3
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发表时间：
2013-03-01
影响因子：
2.1
通讯作者：
Hanlon, Roger T.
中科院分区：
文献类型：
--
作者：
Akkaynak, Derya;Allen, Justine J.;Hanlon, Roger T.
头足类以其在不同背景下适应伪装的能力而闻名。由于动态自然光场的挑战和水下使用分光光度仪器的困难，乌贼伪装的身体模式在实验室中得到了光谱表征，但在野外却没有。为了评估墨鱼在其自然栖息地的颜色匹配，我们使用逐点原位光谱技术研究了土耳其爱琴海沿岸的药用乌贼及其背景的光谱特性。采集了7种乌贼的15个光谱数据集；测量了动物身体成分和周围底物在5m以下深度的辐射光谱。我们量化了乌贼成分和背景底物在假想的双色和三色鱼类捕食者眼中的亮度和颜色对比度。此外，我们将辐射光谱转换到sRGB颜色空间，以模拟其对人类观察者的原位外观。在我们研究地点的自然颜色范围内，墨鱼在各种身体模式中与底物光谱密切匹配。理论计算表明，这种影响可能在更深的地方更加明显。我们还发现，遥感领域中常用的一种非生物方法(光谱角度映射器)与生物颜色对比度指标显示出中等程度的相关性。这一性能可以与传统的光谱形状相似性、色调和色度度量方法相媲美。这项研究是第一批量化野外伪装墨鱼配色的研究之一。
Cephalopods are renowned for their ability to adaptively camouflage on diverse backgrounds. Sepia officinalis camouflage body patterns have been characterized spectrally in the laboratory but not in the field due to the challenges of dynamic natural light fields and the difficulty of using spectrophotometric instruments underwater. To assess cuttlefish color match in their natural habitats, we studied the spectral properties of S. officinalis and their backgrounds on the Aegean coast of Turkey using point-by-point in situ spectrometry. Fifteen spectrometry datasets were collected from seven cuttlefish; radiance spectra from animal body components and surrounding substrates were measured at depths shallower than 5 m. We quantified luminance and color contrast of cuttlefish components and background substrates in the eyes of hypothetical di- and trichromatic fish predators. Additionally, we converted radiance spectra to sRGB color space to simulate their in situ appearance to a human observer. Within the range of natural colors at our study site, cuttlefish closely matched the substrate spectra in a variety of body patterns. Theoretical calculations showed that this effect might be more pronounced at greater depths. We also showed that a non-biological method ("Spectral Angle Mapper"), commonly used for spectral shape similarity assessment in the field of remote sensing, shows moderate correlation to biological measures of color contrast. This performance is comparable to that of a traditional measure of spectral shape similarity, hue and chroma. This study is among the first to quantify color matching of camouflaged cuttlefish in the wild.