Spectral and spatial properties of polarized light reflections from the arms of squid (Loligo pealeii) and cuttlefish (Sepia officinalis L.)
Spectral and spatial properties of polarized light reflections from the arms of squid (Loligo pealeii) and cuttlefish (Sepia officinalis L.)
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DOI：
10.1242/jeb.006932
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发表时间：
2007-10-15
影响因子：
2.8
通讯作者：
Cronin, Thomas W.
中科院分区：
文献类型：
--
作者：
Chiou, Tsyr-Huei;Mäthger, Lydia M.;Cronin, Thomas W.
在乌贼和鱿鱼的每一条手臂上，都有一条高反射率的虹膜，可以反射高度偏振光。由于头足类动物具有偏振视觉，因此有人假设这些偏振条纹可能具有种内通信功能。我们确定了当这些无骨的手臂运动时极化是如何变化的。通过测量样品在各种倾斜和旋转角度下反射光的光谱和偏振特性，我们发现臂的实际姿势对反射光的部分偏振或e矢量角几乎没有影响。然而，当照射角度改变时，反射光的部分偏振也改变。信号的光谱反射也受到照射角度的影响，但不受样品取向的影响。电子显微镜样品表明，这些条纹是由虹膜细胞内的几组多层血小板组成的。垂直于每个组的表面以不同的角度取向，这在一定的视角范围内产生基本恒定的偏振光反射。这些结果表明，乌贼和鱿鱼可以发送可靠的偏振信号到接收器，而不管手臂的方向。
On every arm of cuttlefish and squid there is a stripe of high-reflectance iridophores that reflects highly polarized light. Since cephalopods possess polarization vision, it has been hypothesized that these polarized stripes could serve an intraspecific communication function. We determined how polarization changes when these boneless arms move. By measuring the spectral and polarizing properties of the reflected light from samples at various angles of tilt and rotation, we found that the actual posture of the arm has little or no effect on partial polarization or the e-vector angle of the reflected light. However, when the illumination angle changed, the partial polarization of the reflected light also changed. The spectral reflections of the signals were also affected by the angle of illumination but not by the orientation of the sample. Electron microscope samples showed that these stripes are composed of several groups of multilayer platelets within the iridophores. The surface normal to each group is oriented at a different angle, which produces essentially constant reflection of polarized light over a range of viewing angles. These results demonstrate that cuttlefish and squid could send out reliable polarization signals to a receiver regardless of arm orientation.