Visual Acuity in a Species of Coral Reef Fish: Rhinecanthus aculeatus
Visual Acuity in a Species of Coral Reef Fish: Rhinecanthus aculeatus
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DOI：
10.1159/000356977
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发表时间：
2014-01-01
影响因子：
1.7
通讯作者：
Marshall, Justin
中科院分区：
文献类型：
--
作者：
Champ, Connor;Wallis, Guy;Marshall, Justin
珊瑚礁鱼为人类观察者呈现了一系列大胆而鲜明的图案；然而，这种鱼感知这些图案的能力在很大程度上还没有得到检验。为了理解这一点，必须确定这些动物的视觉敏锐度，即它们能够分辨细微细节的程度。行为研究的数量很少，解剖学分析主要集中在对神经节细胞密度的估计上，以预测珊瑚礁鱼类的视觉敏锐度。在这里，我们报告了触发鱼犀牛的视力测量。首先使用一系列行为范式评估视力，然后将这些数据与基于光感受器和神经节细胞计数的解剖学数据进行对比。行为测试表明，高行为敏锐度为1.75个周期。度(-1)，与金鱼(Carassius Auratus)的敏锐度大致相同。然后通过光感受器层的整体蒙特分析和神经节细胞层内细胞的尼氏染色来计算解剖学估计。这两项解剖学测量给出的估计值(光感受器细胞和神经节细胞分别为7.75和3.4周，1级)远远大于行为测试所表明的敏锐度水平。这表明这种硬骨鱼物种的空间分辨率比人类差(30-70周度(-1))，解剖学估计也不能很好地表明这一点。(C)2014年S.Karger AG，巴塞尔
Coral reef fish present the human observer with an array of bold and contrasting patterns; however, the ability of such fish to perceive these patterns is largely unexamined. To understand this, the visual acuity of these animals the degree to which they can resolve fine detail must be ascertained. Behavioural studies are few in number and anatomical analysis has largely focused on estimates of ganglion cell density to predict the visual acuity in coral reef fish. Here, we report visual acuity measures for the triggerfish Rhinecanthus aculeatus. Acuity was first assessed using a series of behavioural paradigms and the figures were then contrasted with those obtained anatomically, based on photoreceptor and ganglion cell counts. Behavioural testing indicated an upper behavioural acuity of 1.75 cycles . degree(-1), which is approximately the same level of acuity as that of the goldfish (Carassius auratus). Anatomical estimates were then calculated from wholemount analysis of the photoreceptor layer and Nissl staining of cells within the ganglion cell layer. Both of these anatomical measures gave estimates that were substantially larger (7.75 and 3.4 cycles , degree-1 for the photo-receptor cells and ganglion cells, respectively) than the level of acuity indicated by the behavioural tests. This indicates that in this teleost species spatial resolution is poor compared to humans (30-70 cycles degree(-1)) and it is also not well indicated by anatomical estimates. (C) 2014 S. Karger AG, Basel