Miyazaki Taeko, Iwami Tetsuo, Somiya Hiroaki, Meyer-Rochow V Benno
Department of Radiation Protection and Safety, National Institute of Radiological Sciences, Ibaraki, Japan.
Zoolog Sci. 2002 Nov;19(11):1223-9. doi: 10.2108/zsj.19.1223.
Accessory corner cones (ACC) have recently been suggested to be UV-sensitive photoreceptor cells. With a view toward explaining prey detection, we examined the topography of retinal ganglion cells and ACCs in two Antarctic nototheniids occupying different ecological niches: the cryopelagic Pagothenia borchgrevinki and the benthic Trematomus bernacchii. Isodensity maps of retinal ganglion cells showed that the main visual axis, coincident with the feeding vector, was in a forward direction in both species. Visual acuity was determined as 3.64 and 4.77 cycles/degree for the respective species. In P. borchgrevinki the highest density of ACCs was associated with the eye's main visual axis. This suggested that this species uses UV-vision during forward-swims and probably in encounters with prey. On the other hand, T. bernacchii possessed two horizontal band-shaped high-density areas of ACCs, which stretched from temporal to nasal and ventral to peripheral retinal regions. Therefore, this species appears to use UV-vision to watch prey across the entire circumference of the lateral area and in the water column above its head.
副角锥细胞（ACC）最近被认为是对紫外线敏感的光感受器细胞。为了解释猎物探测机制，我们研究了两种占据不同生态位的南极南极鱼科鱼类视网膜神经节细胞和副角锥细胞的分布情况：低温浮游的博氏南冰䲢和底栖的伯氏南极䲢。视网膜神经节细胞的等密度图显示，两种鱼的主要视轴（与摄食方向一致）均向前。两种鱼的视力分别为3.64和4.77周/度。在博氏南冰䲢中，副角锥细胞的最高密度与眼睛的主要视轴相关。这表明该物种在向前游动以及可能与猎物相遇时利用紫外线视觉。另一方面，伯氏南极䲢有两个水平带状的副角锥细胞高密度区域，从颞侧延伸至鼻侧，从腹侧延伸至周边视网膜区域。因此，该物种似乎利用紫外线视觉观察侧面区域整个圆周以及其头顶水柱中的猎物。
