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A pigment composition analysis reveals community changes in pre-established stream periphyton under low-level artificial light at night
- Grubisic, Maja, Singer, Gabriel, Bruno, M. Cristina, van Grunsven, Roy H.A., Manfrin, Alessandro, Monaghan, Michael T., Hölker, Franz
- Limnologica 2018 v.69 pp. 55-58
- Bacillariophyceae, Cyanobacteria, hydraulic flumes, nutritive value, periphyton, spring, streams, trophic relationships
- Freshwaters are increasingly exposed to artificial light at night (ALAN), yet the consequences for aquatic primary producers remain largely unknown. We used stream-side flumes to expose three-week-old periphyton to LED light. Pigment composition was used to infer community changes in LED-lit and control periphyton before and after three weeks of treatment. The proportion of diatoms/chrysophytes decreased (14%) and cyanobacteria increased (17%) in lit periphyton in spring. This may reduce periphyton nutritional quality in artificially-lit waters.