<br>各种城市河流条件下微塑料上的微生物群落生态位和优先环境因素,Science of the Total Environment

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各种城市河流条件下微塑料上的微生物群落生态位和优先环境因素
Science of the Total Environment ( IF 8.2 ) Pub Date : 2022-08-02 , DOI: 10.1016/j.scitotenv.2022.157781
Hien Thi Nguyen ₁ , Woodan Choi ₁ , Eun-Ju Kim ₁ , Kyungjin Cho ₁

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微塑料（MP）为水生环境中的微生物提供栖息地;最近阐明了不同的微生物生态位。然而，在环境因素波动的城市河流条件下，人们对 MP 上的微生物群落知之甚少。因此，本研究调查了各种城市河流条件下的 MP 生物膜群落（即有机物含量、盐度和溶解氧（DO）浓度），并评估了影响塑料圈群落的优先因素。9 个生物膜形成反应器在各种环境条件下运行。在所有测试条件下，生物膜在 MP 上生长，细菌多样性降低。有趣的是，生物膜形态和细菌种群是由环境参数驱动的。我们发现，塑料圈群落结构根据环境条件进行分组;水中的有机物含量是决定 MP 生物膜群落的最重要因素，其次是盐度和 DO 浓度。主要的质球群落是变形菌门、拟杆菌门、蓝细菌门和厚壁菌门。对塑料圈群落的深入分析表明，生物膜形成和塑料降解细菌是主要微生物。此外，主要在有机物含量高的河流水域中发现了潜在的病原体。我们的结果表明，在某些河流水条件下，不同的塑性球群落与 MP 颗粒共存，这意味着不同的 MP 生物膜群落可能以多种方式影响城市河流生态。

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Microbial community niches on microplastics and prioritized environmental factors under various urban riverine conditions

Microplastics (MPs) provide habitats to microorganisms in aquatic environments; distinct microbial niches have recently been elucidated. However, there is little known about the microbial communities on MPs under urban riverine conditions, in which environmental factors fluctuate. Therefore, this study investigated MP biofilm communities under various urban riverine conditions (i.e., organic content, salinity, and dissolved oxygen (DO) concentration) and evaluated the prioritized factors affecting plastisphere communities. Nine biofilm-forming reactors were operated under various environmental conditions. Under all testing conditions, biofilms grew on MPs with decreasing bacterial diversity. Interestingly, biofilm morphology and bacterial populations were driven by the environmental parameters. We found that plastisphere community structures were grouped according to the environmental conditions; organic content in the water was the most significant factor determining MP biofilm communities, followed by salinity and DO concentration. The principal plastisphere communities were Proteobacteria, Bacteroidetes, Cyanobacteria, and Firmicutes phyla. In-depth analyses of plastisphere communities revealed that biofilm-forming and plastic-degrading bacteria were the predominant microbes. In addition, potential pathogens were majorly discovered in the riverine waters with high organic content. Our results suggest that distinct plastisphere communities coexist with MP particles under certain riverine water conditions, implying that the varied MP biofilm communities may affect urban riverine ecology in a variety of ways.

更新日期：2022-08-02

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