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首页> 外文期刊>Brain, behavior and evolution >Visual Capability of the Weakly Electric Fish Apteronotus albifrons as Revealed by a Modified Retinal Flat-Mount Method
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Visual Capability of the Weakly Electric Fish Apteronotus albifrons as Revealed by a Modified Retinal Flat-Mount Method

机译：改良的视网膜平面安装方法揭示弱电鱼A翅生物的视觉能力

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Apteronotus albifrons (Gymnotiformes, Apteronotidae) is well known to have a sophisticated active electrosense system and is commonly described as having poor vision or being almost blind. However, some studies on this species suggest that the visual system may have a role in sensing objects in the environment. In this study, we investigated the visual capabilities of A. albifrons by focusing on eye morphology and retinal ganglion cell distribution. The eyes were almost embedded below the body surface and pigmented dermal tissue covered the peripheral regions of the pupil, limiting the direction of incoming light. The lens was remarkably flattened compared to the almost spherical lenses of other teleosts. The layered structure of the retina was not well delineated and ganglion cells did not form a continuous sheet of cell bodies. A newly modified retinal flat-mount method was applied to reveal the ganglion cell distribution. This method involved postembedding removal of the pigment epithelium of the retina for easier visualization of ganglion cells in small and/or fragile retinal tissues. We found that ganglion cell densities were relatively high in the periphery and highest in the nasal and temporal retina, although specialization was not so high (approx. 3:1) with regard to the medionasal or mediotemporal axis. The estimated highest possible spatial resolving power was around 0.57 and 0.54 cycles/degree in the nasal and temporal retina, respectively, confirming the lower importance of the visual sense in this species. However, considering the hunting nature of A. albifrons, the relatively high acuity of the caudal visual field in combination with electrolocation may well be used to locate prey situated close to the side of the body. (C) 2015 S. Karger AG, Basel
机译：众所周知，Apteronotus albifrons（Gymnotiformes，Apteronotidae）具有复杂的有源电感应系统，通常被描述为视力差或几乎失明。但是，有关该物种的一些研究表明，视觉系统可能在感知环境中的物体方面起作用。在这项研究中，我们通过关注眼睛的形态和视网膜神经节细胞分布，研究了A. albifrons的视觉功能。眼睛几乎嵌在体表下方，有色的真皮组织覆盖了瞳孔的周围区域，从而限制了入射光的方向。与其他硬骨鱼的近球形透镜相比，该透镜显着变平。视网膜的分层结构没有很好地描绘出来，神经节细胞没有形成连续的细胞体片。一种新的修改过的视网膜平板安装方法被用来揭示神经节细胞的分布。该方法涉及植入后去除视网膜的色素上皮，以便更容易地可视化小和/或脆弱的视网膜组织中的神经节细胞。我们发现神经节细胞密度在外周相对较高，而在鼻和颞视网膜最高，尽管就中胚轴或颞中轴而言，其专一化程度不高（约3：1）。在鼻和颞视网膜中，估计的最高可能的空间分辨力分别为大约0.57和0.54个循环/度，这证实了视觉在该物种中的重要性较低。但是，考虑到拟南芥的狩猎性质，尾视视野相对较高的敏锐度与电定位相结合可以很好地定位靠近身体侧面的猎物。 （C）2015 S.Karger AG，巴塞尔

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