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| Effects of mangrove degradation on the characteristics of bacterial communities colonizing microplastics |
| Received:July 06, 2022 |
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| KeyWord:microplastic;degraded mangrove ecosystem;microbial community;ecological function |
| Author Name | Affiliation | E-mail | | LI Dazhen | Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China
College of Architecture and Environment, Sichuan University, Chengdu 610065, China
College of Ecology and Environment, Hainan University, Haikou 570228, China | | | ZHANG Yuqing | Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China
Key Laboratory of Environmental Toxicology of Haikou City, Haikou 570228, China
College of Ecology and Environment, Hainan University, Haikou 570228, China | | | FU Qianqian | Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China
Key Laboratory of Environmental Toxicology of Haikou City, Haikou 570228, China
College of Ecology and Environment, Hainan University, Haikou 570228, China | | | CHEN Haiying | Hainan Qingshi Environmental Engineering Technology Co., LTD., Haikou 571199, China | | | DENG Hui | Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China
Key Laboratory of Environmental Toxicology of Haikou City, Haikou 570228, China
College of Ecology and Environment, Hainan University, Haikou 570228, China | huid88@163.com | | GE Chengjun | Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China
Key Laboratory of Environmental Toxicology of Haikou City, Haikou 570228, China
College of Ecology and Environment, Hainan University, Haikou 570228, China | cjge3007@163.com |
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| Abstract: |
| To investigate the ecological effects of microplastics(MPs) on microorganisms in mangrove ecosystems and the role of microorganisms in the continuous degradation of mangrove ecosystems, the Dongzhaigang Mangrove Nature Reserve in Hainan Province was selected as the research area in this study. The undegraded and degraded mangrove ecosystems were selected as the research objects. Polyethylene(PE), one of the most common MPs in mangrove ecosystems, was used as the target MPs. In situ exposure experiments and high-throughput sequencing techniques were used to analyze the structure and functional diversity of bacterial communities on the surface of PE-MPs after short- and long-term exposure. The results showed that exposure time significantly affected the richness and diversity of bacterial communities on PE-MPs in mangrove ecosystems, while mangrove degradation had no significant effect. Proteobacteria, Actinobacteria, Bacteroidetes, and Chloroflexi were the dominant bacterial communities colonizing the surface of PE-MPs, with their relative abundance ranging from(0.87%±0.04%) to(91.98%±4.60%). The composition and function of the main bacterial communities colonizing the surface of PE-MPs were closely related to the exposure time and the exposure site. During the short-term exposure, the main ecological functional groups of PE-MPs in degraded and undegraded mangrove ecosystems were related to carbon metabolism[relative abundance was(27.37% ±1.37%) -(29.02% ±1.45%)]. After long-term exposure, the key bacteria and their functional groups showed significant differences between PE-MPs in undegraded and degraded mangrove ecosystems. After long-term exposure, PE-MPs in the undegraded mangrove ecosystem had a higher abundance of carbon metabolism groups(47.24% ±2.36%), among which the compound degradation functional group(17.87%±0.89%) was an important component, which may be related to the high abundance of Alcanivorax (14.76%±0.74%) and other hydrocarbon-degrading bacteria on the surface of PE-MPs. The abundance of functional groups related to the sulfur cycle was significantly higher(39.78% ±1.99%) on the surface of PE-MPs in the degraded mangrove ecosystem, which may be related to the high abundance of sulfur-oxidizing bacteria and sulfate-reducing bacteria(32.80%±1.64%) on the surface of PE-MPs. The results show that mangrove degradation affects the composition of bacterial communities on the surface of PE-MPs over time, further influencing the response of microbial colonization to ecological functions. |
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