Synergetic effects of chlorinated paraffins and microplastics on microbial communities and nitrogen cycling in deep-sea cold seep sediments,Journal of Hazardous Materials

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Synergetic effects of chlorinated paraffins and microplastics on microbial communities and nitrogen cycling in deep-sea cold seep sediments
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-08 , DOI: 10.1016/j.jhazmat.2024.135760
Lina Lyu ₁ , Yang Wu ₂ , Yangjun Chen ₃ , Jie Li ₁ , Yu Chen ₄ , Lin Wang ₁ , Zhimao Mai ₁ , Si Zhang ₅

Affiliation

Chlorinated paraffins (CPs) and microplastics (MPs) are commonly found in deep-sea cold seep sediments, where nitrogen cycling processes frequently occur. However, little is known about their combined effects on sedimentary microbial communities and nitrogen cycling in these environments. This study aimed to investigate the synergistic impacts of CPs and MPs on microbial communities and nitrogen cycling in deep-sea cold seep sediments through microcosm experiments. Our results demonstrated that the presence of CPs and MPs induced significant alterations in microbial community composition, promoting the growth of Halomonas. Furthermore, CPs and MPs were found to enhance nitrification, denitrification and anammox processes, which was evidenced by the higher abundance of genes associated with nitrification and denitrification, as well as increased activity of denitrification and anammox in the CPs and MPs-treatment groups compared to the control group. Additionally, the enhanced influence of CPs and MPs on denitrification was expected to promote nitrate-dependent and sulfate-dependent anaerobic oxidation of methane, thereby resulting in less methane released into the environment. These findings shed light on the potential consequences of simultaneous exposure to CPs and MPs on biogeochemical nitrogen cycling in deep-sea cold seep sediments.

中文翻译：

氯化石蜡和微塑料对深海冷泉沉积物微生物群落和氮循环的协同效应

氯化石蜡（CPs）和微塑料（MP）常见于深海冷泉沉积物中，其中氮循环过程频繁发生。然而，人们对它们对这些环境中沉积微生物群落和氮循环的综合影响知之甚少。本研究旨在通过微观实验，探讨 CPs 和 MPs 对深海冷泉沉积物中微生物群落和氮循环的协同影响。我们的结果表明，CPs 和 MP 的存在诱导微生物群落组成的显着改变，促进盐单胞菌的生长。此外，发现 CPs 和 MPs 可增强硝化、反硝化和厌氧氨氧化过程，这与对照组相比，CPs 和 MPs 处理组与硝化和反硝化相关的基因丰度更高，反硝化和厌氧氨氧化活性增加证明了这一点。此外，CPs 和 MPs 对反硝化作用的增强预计将促进甲烷的硝酸盐依赖性和硫酸根依赖性厌氧氧化，从而减少释放到环境中的甲烷。这些发现揭示了同时暴露于 CPs 和 MPs 对深海冷泉沉积物中生物地球化学氮循环的潜在影响。

更新日期：2024-09-08

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