Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 752, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.142223
Keywords
Microplastics; Biofilm; Biodegradation; Pathogens; 16s RNA; Intertidal zone
Categories
Funding
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) [ZJW-2019-07, ZJW-2019-08]
- Guangdong MEPP Fund [GDOE 2019A52]
- Guangdong Yangfan Program [201635018]
- Guangdong Special Support Program [2017TQ04N706]
- Science and Technology Planning Project of Zhanjiang City [2018A02014]
- Special Funds for Science Technology Innovation and Industrial Development of Shenzhen Dapeng New District [KY20180202, PT202001-18]
- Innovation and Development Project about Marine Economy Demonstration of Zhanjiang City [2017C8B1]
- R&D on Degradation of DL-PCBs and Microplastics Exposure to Microbes in South China Sea (Zhanjiang))
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Microplastics pollution poses a new threat to mangrove ecosystems, but some signs of biodegradation were observed on certain types of microplastics after exposure. The microbial communities in mangrove soil and microplastic biofilms vary with seasons, showing distinctive characteristics. Microplastics may have higher inclusivity to bacteria and carry human pathogens, affecting plant growth and health in mangrove habitats.
Microplastics pollution poses a new threat to the environment of intertidal zone. The sea forest, mangrove, has been polluted by a large number of plastic debris worldwide. To fill the gaps in knowledge of mangrove rhizosphere microbes connected with the `plasticsphere', a semi-controlled in situ exposure experiment for nine different types of microplastics were conducted in mangrove ecosystem. A sign of biodegrading was observed on polyethylene, polyamide 6 and polyvinyl chloride microplastics surface after 3 months exposure. We discovered that the metabolic activities of the dominant bacteria on certain microplastics were related to the specific groups on polymers molecule. The selective colonization may be driven by the chemotaxis of bacteria. Specially, microplastics biofilms of polyethylene, polyamide 6, polyvinyl chloride and expanded polystyrene possess distinctive dominant bacteria assemblages which have great significance in ecosystem processes involving carbon cycle or sulfur cycle. Community of mangrove soil microorganism and microplastic biofilm varies as the seasons changes. As a new niche, microplastics has higher inclusivity to bacteria than surrounding soil. Additionally, pathogens for human beings (Vibrio parahaemolyticus and Escherichia-Shigella) were detected both in microplastics and soil. We stress that the interaction between microplastics and rhizosphere microorganisms may affect the growth and health of mangrove plants. Besides, we point out that mangrove rhizosphere microorganism can be an ideal candidate for plastics-degradation. (C) 2020 Elsevier B.V. All rights reserved.
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