Polarization vision can improve object detection in turbid waters by cuttlefish
Polarization vision can improve object detection in turbid waters by cuttlefish
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DOI：
10.1016/j.jembe.2013.02.013
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发表时间：
2013-09-01
影响因子：
2
通讯作者：
Shashar, Nadav
中科院分区：
文献类型：
--
作者：
Cartron, Lelia;Josef, Noam;Shashar, Nadav
不同的研究人员提出了利用偏振视觉通过浑浊的水改善能见度的方法，但很少有行为测试。头足类可以感知光的偏振，但这种敏感度的作用目前还不完全清楚。在这项分两个阶段进行的研究中，我们考察了墨鱼在有或没有极化信息的情况下，通过不同浊度的水检测人工刺激的能力。我们测试了普拉沙迪乌贼和法老乌贼对计算机产生的隐约刺激的反应，这些刺激通过不同程度的水的浑浊度呈现出来。刺激用改进的LCD监视器提供，提供没有偏振分析器无法检测到的偏振图案，并通过CRT监视器提供非偏振的、强度对比的图像。结果表明，这两种乌贼都可以用它们的偏振视觉来探测物体，比如捕食者。这两个物种在包含偏振成分时都检测到了这种模式，通过比只包含强度信息的时候更高的浑浊度。乌贼是蜜底生物，可能经常经历低能见度条件。因此，能够更深入地观察浑浊的水并更好地发现猎物和捕食者的能力将有利于它们的生存。(C)2013爱思唯尔B.V.保留所有权利。
The use of polarization vision to improve visibility through turbid water has been proposed by different researchers, but has rarely been tested behaviorally. Cephalopods perceive the polarization of light but the function of this sensitivity is not fully understood yet. In this two-phase study, we examined the ability of cuttlefish to detect an artificial stimulus through water of different turbidity, with or without polarization information. We tested responses of Sepia prashadi and Sepia pharaonis to computer generated looming stimuli, presented through different levels of water turbidity. Stimuli were presented with a modified LCD monitor delivering polarized pattern that could not be detected without a polarization analyzer, and via a CRT monitor delivering an unpolarized, intensity contrasted image. The results showed that both cuttlefish can use their polarization vision to detect objects, such as a predator. Both species detected the pattern when it included a polarization component, through higher turbidity than when it contained only intensity information. Cuttlefish are nectobenthic organisms which probably often experience low visibility conditions. Therefore the ability to see further into turbid water and to better detect prey and predator would be beneficial for their survival. (C) 2013 Elsevier B.V. All rights reserved.