Dose-dependent responses of avian daily rhythms to artificial light at night
Dose-dependent responses of avian daily rhythms to artificial light at night
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DOI：
10.1016/j.physbeh.2015.12.012
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发表时间：
2016-03-01
影响因子：
2.9
通讯作者：
Visser, Marcel E.
中科院分区：
文献类型：
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作者：
de Jong, Maaike;Jeninga, Lizanne;Visser, Marcel E.
最近的研究表明，动物会受到夜间光照的影响。光是一个连续的变量，但我们对个体在夜间如何对不同的光强度做出反应的知识是有限的。因此，我们确定了夜间光照强度与大山雀(Parus Main)行为和生理的关系。我们测量了35名暴露在五种不同光强度下的男性的日常活动模式和褪黑素水平，发现了强烈的剂量依赖效应。光照强度越高，活动开始时间越早，活动抵消时间越晚。此外，夜间活动增加，午夜测得的褪黑素水平随着强度的增加而下降。在这项实验研究中，我们首次展示了夜间人工灯光对鸟类日常活动模式和褪黑素水平的剂量依赖效应。我们的结果表明，这些影响并不局限于特定的阈值，即使在夜间光照水平略有增加的情况下也会出现。然而，在自然区域，这些影响可能是有限的，因为人造灯光水平通常很低；随着距离光源的距离，灯光强度迅速下降，鸟类可以避免在夜间暴露在灯光下。因此，未来的研究应该集中在研究野外夜间不同强度的光的影响。(C)2015 Elsevier Inc.保留所有权利。
Recent studies have shown that animals are affected by night-time light exposure. Light is a continuous variable, but our knowledge on how individuals react to different light intensities during the night is limited. We therefore determined the relationship between night light intensity and the behaviour and physiology of great tits (Parus major). We measured daily activity patterns and melatonin levels in 35 males exposed to five different light intensities and found strong, dose-dependent effects. Activity onset was increasingly advanced, and activity offset delayed with higher light intensities. Furthermore, night-time activity increased and melatonin levels measured at midnight decreased with higher intensities. In this experimental study, we demonstrate for the first time dose dependent effects of artificial light at night on birds' daily activity patterns and melatonin levels. Our results imply that these effects are not limited to a certain threshold, but emerge even when nocturnal light levels are slightly increased. However, in a natural area, these effects may be limited as artificial light levels are commonly low; light intensities drop rapidly with distance from a light source and birds can avoid exposure to light at night. Future studies should thus focus on examining the impact of different intensities of light at night in the wild. (C) 2015 Elsevier Inc. All rights reserved.