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Light Pollution Changes the Toxicological Effects of Cadmium on Microbial Community Structure and Function Associated with Leaf Litter Decomposition

1
School of Pharmacy and Biological Sciences, Weifang Medical University, Weifang 261053, China
2
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
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(2), 422; https://doi.org/10.3390/ijms21020422
Received: 21 November 2019 / Revised: 27 December 2019 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Section Molecular Microbiology)
Artificial light at night (ALAN/A) can not only alter the behavior and communication of biological organisms, it can also interact with other stressors. Despite its widespread use and the numerous potential ecological effects, little is known about the impact of ALAN on plant litter decomposition under cadmium (Cd) pollution in aquatic ecosystems. In an indoor microcosm experiment, we tested single and combined effects of ALAN and Cd on the activities and community structure of fungi associated with plant litter. The results showed that ALAN and/or Cd can change both water and leaf litter characteristics. ALAN exposure not only altered fungal community structure and their correlations, but also increased the activities of alkaline phosphatase, β-glucosidase, and cellobiohydrolase. The leaf litter decomposition rate was 71% higher in the A-Cd treatment than that in the N-Cd treatment, indicating that the presence of ALAN weakened the negative impact of Cd on leaf litter decomposition. These results suggested that ALAN exposure mitigated the negative effect of Cd on leaf litter decomposition, contributing to the duel effect of ALAN on leaf litter decomposition. Overall, the results expand our understanding of ALAN on the environment and highlight the contribution of ALAN to Cd toxicity in aquatic ecosystems. View Full-Text
Keywords: artificial light at night; litter decomposition; cadmium pollution; extracellular enzyme activities; Illumina Sequencing; microbial biodiversity artificial light at night; litter decomposition; cadmium pollution; extracellular enzyme activities; Illumina Sequencing; microbial biodiversity
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Liu, Z.; Lv, Y.; Ding, R.; Chen, X.; Pu, G. Light Pollution Changes the Toxicological Effects of Cadmium on Microbial Community Structure and Function Associated with Leaf Litter Decomposition. Int. J. Mol. Sci. 2020, 21, 422.

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