Brüning Anika, Hölker Franz, Franke Steffen, Kleiner Wibke, Kloas Werner
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
Free University of Berlin, Institute of Biology, Schwendenerstr. 1, 14195, Berlin, Germany.
Fish Physiol Biochem. 2018 Feb;44(1):1-12. doi: 10.1007/s10695-017-0408-6. Epub 2017 Jul 18.
In this study we investigated the influence of artificial light at night (ALAN) of different intensities (0, 1, 10, 100 lx) and different colours (blue, green, red) on the daily melatonin rhythm and mRNA expression of gonadotropins in roach Rutilus rutilus, a ubiquitous cyprinid, which occur in standing and moderately flowing freshwater habitats of central Europe. Melatonin concentrations were significantly lowered under nocturnal white light already at 1 lx. Low intensity blue, green and red ALAN lowered the melatonin levels significantly in comparison to a dark control. We conclude that ALAN can disturb melatonin rhythms in roach at very low intensities and at different wavelengths and thus light pollution in urban waters has the potential to impact biological rhythms in fish. However, mRNA expression of gonadotropins was not affected by ALAN during the period of the experiments. Thus, suspected implications of ALAN on reproduction of roach could not be substantiated.
在本研究中，我们调查了不同强度（0、1、10、100勒克斯）和不同颜色（蓝色、绿色、红色）的夜间人工光（ALAN）对拟鲤（Rutilus rutilus）日常褪黑素节律以及促性腺激素mRNA表达的影响。拟鲤是一种广泛分布的鲤科鱼类，见于中欧的静水和适度流动的淡水生境。在夜间1勒克斯的白光下，褪黑素浓度就已显著降低。与黑暗对照组相比，低强度的蓝色、绿色和红色ALAN显著降低了褪黑素水平。我们得出结论，ALAN在极低强度和不同波长下就能扰乱拟鲤的褪黑素节律，因此城市水域的光污染有可能影响鱼类的生物节律。然而，在实验期间，促性腺激素的mRNA表达并未受到ALAN的影响。因此，关于ALAN对拟鲤繁殖的潜在影响的怀疑无法得到证实。
