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首页> 外文期刊>Journal of Comparative Physiology, A. Sensory, Neural, and Behavioral Physiology >Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning
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Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning

机译：三种冰川遗留Mysis物种（甲壳纲）的淡水和微咸水种群中的眼睛光谱敏感性：差异调节的生理学和遗传学

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摘要

Absorbance spectra of single rhabdoms were studied by microspectrophotometry (MSP) and spectral sensitivities of whole eyes by electroretinography (ERG) in three glacial-relict species of opossum shrimps (Mysis). Among eight populations from Fennoscandian fresh-water lakes (L) and seven populations from the brackish-water Baltic Sea (S), L spectra were systematically red-shifted by 20-30 nm compared with S spectra, save for one L and one S population. The difference holds across species and bears no consistent adaptive relation to the current light environments. In the most extensively studied L-S pair, two populations of M. relicta (L (p) and S (p)) separated for less than 10,000 years, no differences translating into amino acid substitutions have been found in the opsin genes, and the chromophore of the visual pigments as analyzed by HPLC is pure A1. However, MSP experiments with spectrally selective bleaching show the presence of two rhodopsins (lambda (max) a parts per thousand 525-530 nm, MWS, and 565-570 nm, LWS) expressed in different proportions. ERG recordings of responses to "red" and "blue" light linearly polarized at orthogonal angles indicate segregation of the pigments into different cells differing in polarization sensitivity. We propose that the pattern of development of LWS and MWS photoreceptors is governed by an ontogenetic switch responsive to some environmental signal(s) other than light that generally differ(s) between lakes and sea, and that this reaction norm is conserved from a common ancestor of all three species.
机译：通过显微分光光度法（MSP）研究单个横纹的吸收光谱，并通过视网膜电图（ERG）研究全鼠眼在三种冰川下的负鼠物种（Mysis）中的吸收光谱。在芬诺斯堪的淡水湖（L）的八个种群和咸淡水波罗的海（S）的七个种群中，L光谱与S光谱相比被系统地红移了20-30 nm，除了一个L和一个S人口。不同物种之间存在差异，并且与当前的光照环境没有一致的适应性关系。在研究最广泛的LS对中，两个遗物M. relicta（L（p）和S（p））间隔不到10,000年，在视蛋白基因和发色团中未发现转化为氨基酸取代的差异通过HPLC分析的可视颜料的纯A1。但是，采用光谱选择性漂白的MSP实验表明，存在两种视紫红质（λ（最大值），千分之525-530 nm（MWS）和565-570 nm，LWS）以不同的比例表示。对以正交角度线性偏振的“红色”和“蓝色”光的响应的ERG记录表明，颜料偏析到偏振灵敏度不同的不同单元中。我们建议，LWS和MWS感光细胞的发育模式是由自生开关控制的，该自生开关响应某些环境信号，而不是湖泊和海洋之间通常不同的光，并且该反应规范与共同这三个物种的祖先。

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