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首页> 外文期刊>The Journal of Experimental Biology >Increasing the illumination slowly over several weeks protects against light damage in the eyes of the crustacean Mysis relicta
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Increasing the illumination slowly over several weeks protects against light damage in the eyes of the crustacean Mysis relicta

机译：在几周内缓慢增加照明可以防止甲壳动物米西斯遗骸的眼睛损坏

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摘要

The eyes of two glacial-relict populations of opossum shrimp Mysis relicta inhabiting the different photic environments of a deep, dark-brown freshwater lake and a variably lit bay of the Baltic Sea differ in their susceptibility to functional depression from strong light exposures. The lake population is much more vulnerable than the sea population. We hypothesized that the difference reflects physiological adaptation mechanisms operating on long time scales rather than genetically fixed differences between the populations. To test this, we studied how acclimation to ultra-slowly increased illumination (on time scales of several weeks to months) affected the resilience of the eyes to bright-light exposures. Light responses of whole eyes were measured by electroretinography, the visual-pigment content of single rhabdoms by microspectrophotometry and the structural integrity of photoreceptor cells by electron microscopy (EM). Slow acclimation mitigated and even abolished the depression of photoresponsiveness caused by strong light exposures, making a dramatic difference especially in the lake animals. Still, acclimation in the sea animals was faster and the EM studies suggested intrinsic differences in the dynamics of microvillar membrane cycling. In conclusion, we report a novel form of physiological adaptation to general light levels, effective on the time scale of seasonal changes. It explains part but not all of the differences in light tolerance between the lake and sea populations.
机译：两个冰川般的冰川般的植物群体的眼睛居住在深褐色的淡水湖和波罗的海的可变灯水的不同光环境中居住在波罗的海的不同的光照环境中对来自强光曝光的功能抑郁症的敏感性不同。湖泊人口比海洋人群更容易受到影响。我们假设差异反映了在长期运行的生理适应机制，而不是群体之间的根本固定差异。为了测试这一点，我们研究了如何驯化到超级缓慢的照明（在数周至数月的时间尺度上）影响了眼睛对亮光曝光的恢复力。通过电测绘术，通过微痉挛测量术，通过微痉挛，通过电子显微镜（EM）的光感受器细胞的结构完整性来测量整个眼睛的光反应。缓慢的驯化缓慢缓解，甚至废除了强烈的光曝光引起的光反应性的抑制，尤其是在湖泊动物中的戏剧性差异。尽管如此，海洋动物的适应性越来越快，EM研究表明微血管膜循环动态的内在差异。总之，我们向一般光线水平报告了一种新颖的生理适应形式，对季节性变化的时间规模有效。它解释了湖泊和海洋群体之间的耐光性的所有差异。

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