The blue coloration of the common surgeonfish, Paracanthurus hepatus -: II.: Color revelation and color changes
The blue coloration of the common surgeonfish, Paracanthurus hepatus -: II.: Color revelation and color changes
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DOI：
10.2108/zsj.15.323
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发表时间：
1998-06-01
影响因子：
0.9
通讯作者：
Fujii, R
中科院分区：
文献类型：
--
作者：
Goda, M;Fujii, R
测量了常见的肝副棘鱼皮肤的天蓝色部分的光谱反射率，发现在490 nm左右有一个相对陡峭的峰值。我们认为，非理想型的多层薄膜干涉现象，发生在该区域虹膜载体中极薄的光反射小片堆叠中，是揭示该色调的主要原因。虹膜基团的结构结构与蓝色淡水鱼极为相似，但不同之处在于，与外科鱼真皮最上层的虹膜基团相比，淡水鱼的虹膜基团是单层存在的。如果与柔鱼鲜艳的钴蓝色调相比，刺鱼的蓝色色调的纯度就相当低了。这可能主要归因于后者中的双层虹膜，因为入射光线在地层中复杂地反射和散布。外科鱼躯干上特有的剪刀状图案呈深蓝色，主要是由于黑素细胞的密集种群，因为虹膜细胞只以分散的方式存在于那里。体内的摄影和光谱反射研究，以及对体外皮肤标本中色团状态的光学显微镜、光电和光谱检查，表明黑素和虹膜都是能动的。生理分析表明，黑素载体受交感神经和内分泌系统的控制，而虹膜载体主要由神经调节。外科鱼的体色表现出昼夜节律的变化，在夜间变得更加苍白；这种影响可能是由松果体激素褪黑素介导的，褪黑素是黑素基团中的色素聚集物。
Measurements of spectral reflectance from the sky-blue portion of skin from the common surgeonfish, Paracanthurus hepatus, showed a relatively steep peak at around 490 nm. We consider that a multilayer thin-film interference phenomenon of the non-ideal type, which occurs in stacks of very thin light-reflecting platelets in iridophores of that region, is primarily responsible for the revelation of that hue. The structural organization of the iridophore closely resembles that of bluish damselfish species, although one difference is the presence of iridophores in a monolayer in the damselfish compared to the double layer of iridophores in the uppermost part of the dermis of surgeonfish. If compared with the vivid cobalt blue tone of the damselfish, the purity of the blue hue of the surgeonfish is rather low. This may be ascribable mainly to the double layer of iridophores in the latter since incident lightrays are complicatedly reflected and scattered in the strata. The dark-blue hue of the characteristic scissors-shaped pattern on the trunk of surgeonfish is mainly due to the dense population of melanophores, because iridophores are only present there in a scattered fashion. Photographic and spectral reflectance studies in vivo, as well as photomicrographic, photoelectric, and spectrometric examinations of the state of chromatophores in skin specimens in vitro, indicate that both melanophores and iridophores are motile. Physiological analyses disclosed that melanophores are under the control of the sympathetic nervous and the endocrine systems, while iridophores are regulated mainly by nerves. The body color of surgeonfish shows circadian changes, and becomes paler at night; this effect may be mediated by the pineal hormone, melatonin, which aggregates pigment in melanophores.