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Fish Physiol Biochem. 2018 Feb;44(1):1-12. doi: 10.1007/s10695-017-0408-6. Epub 2017 Jul 18.

Influence of light intensity and spectral composition of artificial light at night on melatonin rhythm and mRNA expression of gonadotropins in roach Rutilus rutilus.

Author information

1
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany. bruening@igb-berlin.de.
2
Free University of Berlin, Institute of Biology, Schwendenerstr. 1, 14195, Berlin, Germany. bruening@igb-berlin.de.
3
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
4
Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany.

Abstract

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.

KEYWORDS:

Biological rhythms; Fish; Light colour; Light intensity; Light pollution; Reproduction

PMID:
28721487
DOI:
10.1007/s10695-017-0408-6
[Indexed for MEDLINE]

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