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Open AccessArticle

Artificial Light at Night Alleviates the Negative Effect of Pb on Freshwater Ecosystems

1
Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
2
College of Life Science, Guangxi Normal University, Guilin 541006, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(6), 1343; https://doi.org/10.3390/ijms20061343
Received: 25 January 2019 / Revised: 14 March 2019 / Accepted: 14 March 2019 / Published: 17 March 2019
(This article belongs to the Section Molecular Microbiology)
Artificial light at night (ALAN) is an increasing phenomenon worldwide that can cause a series of biological and ecological effects, yet little is known about its potential interaction with other stressors in aquatic ecosystems. Here, we tested whether the impact of lead (Pb) on litter decomposition was altered by ALAN exposure using an indoor microcosm experiment. The results showed that ALAN exposure alone significantly increased leaf litter decomposition, decreased the lignin content of leaf litter, and altered fungal community composition and structure. The decomposition rate was 51% higher in Pb with ALAN exposure treatments than in Pb without ALAN treatments, resulting in increased microbial biomass, β-glucosidase (β-G) activity, and the enhanced correlation between β-G and litter decomposition rate. These results indicate that the negative effect of Pb on leaf litter decomposition in aquatic ecosystems may be alleviated by ALAN. In addition, ALAN exposure also alters the correlation among fungi associated with leaf litter decomposition. In summary, this study expands our understanding of Pb toxicity on litter decomposition in freshwater ecosystems and highlights the importance of considering ALAN when assessing environmental metal pollutions. View Full-Text
Keywords: litter decomposition; light pollution; fungal community; metagenomics; extracellular hydrolytic enzymes litter decomposition; light pollution; fungal community; metagenomics; extracellular hydrolytic enzymes
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Pu, G.; Zeng, D.; Mo, L.; Liao, J.; Chen, X. Artificial Light at Night Alleviates the Negative Effect of Pb on Freshwater Ecosystems. Int. J. Mol. Sci. 2019, 20, 1343.

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