A transition to white LED increases ecological impacts of nocturnal illumination on aquatic primary producers in a lowland agricultural drainage ditch

Environmental Pollution
Maja GrubisicFranz Hölker

Abstract

The increasing use of artificial light at night (ALAN) has led to exposure of freshwater ecosystems to light pollution worldwide. Simultaneously, the spectral composition of nocturnal illumination is changing, following the current shift in outdoor lighting technologies from traditional light sources to light emitting diodes (LED). LEDs emit broad-spectrum white light, with a significant amount of photosynthetically active radiation, and typically a high content of blue light that regulates circadian rhythms in many organisms. While effects of the shift to LED have been investigated in nocturnal animals, its impact on primary producers is unknown. We performed three field experiments in a lowland agricultural drainage ditch to assess the impacts of a transition from high-pressure sodium (HPS) to white LED illumination (color temperature 4000 K) on primary producers in periphyton. In all experiments, we compared biomass and pigment composition of periphyton grown under a natural light regime to that of periphyton exposed to nocturnal HPS or, consecutively, LED light of intensities commonly found in urban waters (approximately 20 lux). Periphyton was collected in time series (1-13 weeks). We found no effect of HPS light on periph...Continue Reading

Citations

Nov 4, 2020·Nature Ecology & Evolution·Dirk SandersKevin J Gaston
May 10, 2021·The Science of the Total Environment·Magdalena CzarneckaTomasz Kakareko
Jun 24, 2021·Proceedings. Biological Sciences·Christina DiamantopoulouSofie Spatharis
Apr 20, 2019·Environmental Science & Technology·Anderson Abel de Souza MachadoWerner Kloas
Aug 31, 2021·Journal of Imaging·Zoltán KolláthKai Pong Tong
Aug 31, 2021·Journal of Imaging·Zoltán KolláthKornél Kolláth

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