King R B, Douglass J K, Phillips J B, Baube C L
Department of Biology, Indiana University, Bloomington 47405.
J Exp Zool. 1993 Sep 15;267(1):40-6. doi: 10.1002/jez.1402670107.
Amphibians are unusual among vertebrates in having two spectral classes of rod photoreceptors, unique amphibian "green" rods and typical vertebrate "red" rods. Although amphibians have been the subject of extensive research on visual function, it is not known whether possession of two classes of rods is a general feature of Amphibia, nor is it clear to what behaviors each class of rods contributes. The Hylidae comprise one of the largest families within Amphibia but have been little studied with respect to visual function. Here, we demonstrate the presence of green and red rods in Hyla cinerea by microspectrophotometry and provide evidence for the contribution of green rods to one visually based behavior, the optomotor response. In addition, we discuss the role of green and red rods in visually based behavior in light of apparently conflicting demands resulting from the need to maximize absolute sensitivity, visual acuity, and color sensitivity.
两栖动物在脊椎动物中很不寻常，它们有两类光谱不同的视杆光感受器，即独特的两栖动物“绿色”视杆和典型的脊椎动物“红色”视杆。尽管两栖动物一直是视觉功能广泛研究的对象，但尚不清楚拥有两类视杆是否是两栖纲的普遍特征，也不清楚每类视杆对哪些行为有贡献。雨蛙科是两栖纲中最大的科之一，但在视觉功能方面的研究很少。在这里，我们通过显微分光光度法证明了灰树蛙中存在绿色和红色视杆，并为绿色视杆对一种基于视觉的行为——视动反应的贡献提供了证据。此外，鉴于需要最大化绝对灵敏度、视敏度和颜色灵敏度而产生的明显相互冲突的需求，我们讨论了绿色和红色视杆在基于视觉的行为中的作用。
