Influence of Light Intensity and Spectral Composition of Artificial Light at Night on Melatonin Rhythm and MRNA Expression of Gonadotropins in Roach Rutilus Rutilus

Overview

Journal Fish Physiol Biochem

Specialty Biochemistry

Date 2017 Jul 20

PMID 28721487

Citations 11

Authors

Anika Bruning

Franz Holker

Steffen Franke

Wibke Kleiner

Werner Kloas

Affiliations

Soon will be listed here.

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.

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