Controlled iris radiance in a diurnal fish looking at prey
Controlled iris radiance in a diurnal fish looking at prey
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日间鱼类在观察猎物时控制虹膜辐射
DOI：
10.1101/206615
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发表时间：
2017
影响因子：
3.5
通讯作者：
C. Jack
中科院分区：
文献类型：
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作者：
N. Michiels;V. Seeburger;Nadine Kalb;M. Meadows;N. Anthes;Amalia A. Mailli;C. Jack
使用光的主动传感或主动光定位仅在深海和具有化学发光“搜索”灯的夜行鱼中发现。最近有人提出在昼行性鱼类中出现明亮的虹彩是一种潜在的类似物。在这里，我们通过测试虹膜辐射是否被主动调制来促进这一讨论。重点是行为控制的虹膜反射，称为“视觉火花”。三鳍Triplefin delaisi可以在红色和蓝色的眼睛火花之间交替，使我们能够测试火花频率和色调取决于背景色调和猎物存在的预测。在第一个实验中，我们发现，蓝色的眼睛火花显着更经常“对”红色背景，红色的眼睛火花对蓝色背景，特别是当桡足类动物存在。第二个实验测试饥饿的鱼是否表现出更多的视觉火花，事实并非如此。再次，背景色调导致眼睛火花类型的差异使用。我们认为T. Delaisi不是眼睛运动的副作用，而是响应于检测到猎物的环境而适应性地调节。我们讨论了可能的替代功能的眼睛火花，包括一个尚未推测的作用，在积极的光定位。
Active sensing using light, or active photolocation, is only known from deep sea and nocturnal fish with chemiluminescent “search” lights. Bright irides in diurnal fish species have recently been proposed as a potential analogue. Here, we contribute to this discussion by testing whether iris radiance is actively modulated. The focus is on behaviourally controlled iris reflections, called “ocular sparks”. The triplefin Tripterygion delaisi can alternate between red and blue ocular sparks, allowing us to test the prediction that spark frequency and hue depend on background hue and prey presence. In a first experiment, we found that blue ocular sparks were significantly more often “on” against red backgrounds, and red ocular sparks against blue backgrounds, particularly when copepods were present. A second experiment tested whether hungry fish showed more ocular sparks, which was not the case. Again, background hue resulted in differential use of ocular spark types. We conclude that iris radiance through ocular sparks in T. delaisi is not a side effect of eye movement, but adaptively modulated in response to the context under which prey are detected. We discuss the possible alternative functions of ocular sparks, including an as yet speculative role in active photolocation.
影响因子：
5.8
作者：
Aaron M. Christ
通讯作者：
Aaron M. Christ
JST 我的门户 中川
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