Multiple cone visual pigments and the potential for trichromatic colour vision in two species of elasmobranch
Multiple cone visual pigments and the potential for trichromatic colour vision in two species of elasmobranch
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DOI：
10.1242/jeb.01314
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发表时间：
2004-12-01
影响因子：
2.8
通讯作者：
Collin, SP
中科院分区：
文献类型：
--
作者：
Hart, NS;Lisney, TJ;Collin, SP
板鳃类（鲨鱼、鳐和鳐）是第一种有颌脊椎动物的现代后裔，作为顶级掠食者，通常占据水生（主要是海洋）生态系统的最高营养水平。然而，尽管它们在海洋群落结构中发挥着关键作用，对商业和休闲渔业都很重要，而且它们在脊椎动物进化中的作用也很重要，但人们对它们的视觉能力知之甚少，特别是关于它们是否具有色觉的潜力。使用显微分光光度法，我们表明，视网膜的巨型铲鼻射线（Rhinobatos typus）和东部铲鼻射线（Aptychotrema rostrata）包含三个光谱不同的锥视色素的最大吸收波长（λ（max））在477，502和561 nm和459，492和553 nm，分别。R. typus和A.有喙类也含有单一类型的视杆细胞色素，在504和498 nm处分别具有α，α，。R. typus与A. rostrata的视色素与R.类型居住在珊瑚礁单位，尽管栖息地光谱辐射有相当大的差异。这是首次在板鳃类动物中直接测量多种锥状视色素。这一发现提出了一些物种能够区分颜色的可能性-传统上认为这种脊椎动物缺乏视觉能力-很明显，板鳃类的视觉生态比以前想象的要复杂得多。
Elasmobranchs (sharks, skates and rays) are the modern descendents of the first jawed vertebrates and, as apex predators, often occupy the highest trophic levels of aquatic (predominantly marine) ecosystems. However, despite their crucial role in the structure of marine communities, their importance both to commercial and to recreational fisheries, and the inherent interest in their role in vertebrate evolution, very little is known about their visual capabilities, especially with regard to whether or not they have the potential for colour vision. Using microspectrophotometry, we show that the retinae of the giant shovelnose ray (Rhinobatos typus) and the eastern shovelnose ray (Aptychotrema rostrata) contain three spectrally distinct cone visual pigments with wavelengths of maximum absorbance (lambda(max)) at 477, 502 and 561 nm and at 459, 492 and 553 nm, respectively. The retinae of R. typus and A. rostrata also contain a single type of rod visual pigment with,a,, at 504 and 498 nm, respectively. R. typus, living in the same estuarine waters as A. rostrata, were found to have identical visual pigments to R. typus inhabiting coral reef flats, despite a considerable difference in habitat spectral radiance. This is the first time that multiple cone visual pigments have been measured directly in an elasmobranch. The finding raises the possibility that some species are able to discriminate colour - a visual ability traditionally thought to be lacking in this vertebrate class - and it is evident that the visual ecology of elasmobranchs is far more complex than once thought.