The lens eyes of the box jellyfish Tripedalia cystophora and Chiropsalmus sp. are slow and color-blind
The lens eyes of the box jellyfish Tripedalia cystophora and Chiropsalmus sp. are slow and color-blind
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DOI：
10.1007/s00359-007-0211-4
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发表时间：
2007-05-01
影响因子：
2.1
通讯作者：
Nilsson, D.-E.
中科院分区：
文献类型：
--
作者：
Garm, A.;Coates, M. M.;Nilsson, D.-E.
箱形水母，或称立方体水母，拥有四种不同形态的24只眼睛，令人印象深刻。与其他刺胞动物相比，它们也有复杂的行为技巧，这在很大程度上似乎是由视觉引导的。四种立方体动物眼睛中的两种，称为上晶状体眼和下晶状体眼，是照相机型眼睛，具有球形的鱼状晶状体。在这里，我们使用吸电极探索了加勒比物种Tripedalia cystophora和澳大利亚物种Chiropsalmus sp.的晶状体眼的视网膜电图。我们表明，这两个物种的晶状体眼的光感受器有大约3 log单位的动态范围和缓慢的反应。所有眼睛的光谱灵敏度曲线都在蓝绿色区域出现峰值，但眼球的下晶状体眼在近紫外区域有一个小的附加峰。所有的光谱灵敏度曲线都与单一视蛋白的理论吸光度曲线吻合良好，有力地说明了箱形水母具有单一受体类型的色盲视觉。选择性适应实验支持单一视蛋白的存在。
Box jellyfish, or cubomedusae, possess an impressive total of 24 eyes of four morphologically different types. Compared to other cnidarians they also have an elaborate behavioral repertoire, which for a large part seems to be visually guided. Two of the four types of cubomedusean eyes, called the upper and the lower lens eye, are camera type eyes with spherical fish-like lenses. Here we explore the electroretinograms of the lens eyes of the Caribbean species, Tripedalia cystophora, and the Australian species, Chiropsalmus sp. using suction electrodes. We show that the photoreceptors of the lens eyes of both species have dynamic ranges of about 3 log units and slow responses. The spectral sensitivity curves for all eyes peak in the blue-green region, but the lower lens eye of T. cystophora has a small additional peak in the near UV range. All spectral sensitivity curves agree well with the theoretical absorbance curve of a single opsin, strongly suggesting color-blind vision in box jellyfish with a single receptor type. A single opsin is supported by selective adaptation experiments.