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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Circadian Rhythms of Retinomotor Movement in a Marine Megapredator the Atlantic Tarpon Megalops atlanticus
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Circadian Rhythms of Retinomotor Movement in a Marine Megapredator the Atlantic Tarpon Megalops atlanticus

机译：海洋巨型捕食者大西洋塔彭Megalops atlanticus的视网膜运动昼夜节律

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Many ecologically and economically important marine fish species worldwide spend portions of their lives in coastal regions that are increasingly inundated by artificial light at night. However, while extensive research illustrates the harmful effects of inappropriate light exposure on biological timing in humans, rodents and birds, comparable studies on marine fish are virtually nonexistent. This study aimed to assess the effects of light on biological clock function in the marine fish retina using the Atlantic tarpon (Megalops atlanticus) as a model. Using anti-opsin immunofluorescence, we observed robust rhythms of photoreceptor outer segment position (retinomotor movement) over the course of the daily light–dark cycle: cone outer segments were contracted toward the inner retina and rods were elongated during the day; the opposite occurred at night. Phase shifting the daily light–dark cycle caused a corresponding shift of retinomotor movement timing, and cone retinomotor movement persisted in constant darkness, indicating control by a circadian clock. Constant light abolished retinomotor movements of both photoreceptor types. Thus, abnormally-timed light exposure may disrupt normal M. atlanticus clock function and harm vision, which in turn may affect prey capture and predator avoidance. These results should help inform efforts to mitigate the effects of coastal light pollution on organisms in marine ecosystems.
机译：全球范围内许多具有生态和经济意义的海洋鱼类物种的一部分生活在沿海地区，夜晚越来越多地被人造光淹没。但是，尽管广泛的研究表明不适当的曝光会对人类，啮齿动物和鸟类的生物时间产生有害影响，但几乎没有关于海水鱼类的可比研究。这项研究的目的是使用大西洋海豚（Megalops atlanticus）作为模型来评估光对海水鱼类视网膜中生物钟功能的影响。使用抗视蛋白免疫荧光法，我们观察到在每天的明暗循环过程中，感光器外段位置（视网膜运动运动）的节律强劲：圆锥形外段朝着内部视网膜收缩，杆在白天伸长。相反的事情发生在晚上。每天的明暗循环相移会引起视网膜运动的时间发生相应的偏移，而圆锥形视网膜运动在持续的黑暗中持续存在，表明受昼夜节律的控制。恒定的光消除了两种感光体的视网膜运动运动。因此，定时曝光可能会破坏正常的大西洋支原体时钟功能并损害视力，进而影响捕食和避免捕食。这些结果应有助于减轻沿海光污染对海洋生态系统中生物的影响。

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