由于有机污染物构成的严重威胁,海湾生态系统受到了广泛的关注,特别是多环芳烃(PAHs)。然而,缺乏有关PAHs污染物风险程度及其对该环境中微生物群落和代谢的影响的信息。在这项研究中,分布,来源,生态风险,胶州湾PAHs的微生物群落和代谢响应,Ao山湾,和青岛的灵山湾,中国被调查。结果表明,在三个海湾中,∑PAHs的平均浓度范围为120至614ng/L,胶州和Ao山湾由于高分子量PAHs的浓度增加而表现出比灵山湾更高的风险。进一步的分析表明,水中溶解的有机碳浓度与∑PAHs浓度呈负相关。宏基因组分析表明,高水平的PAHs可导致微生物多样性下降,而PAHs降解菌的丰度增强。此外,红细菌,发现Jannaschia和Ruegeria属与低分子量PAH浓度具有显着相关性。就微生物代谢而言,在天然海湾环境中,较高的PAH浓度有利于碳水化合物代谢途径,但不利于氨基酸代谢途径和膜转运途径。这些发现为控制PAHs污染提供了基础,并提供了有关PAHs对天然海湾环境中细菌群落和代谢的影响的见解。
Bay ecosystem has garnered significant attention due to the severe threat posed by organic pollutants, particularly polycyclic aromatic hydrocarbons (PAHs). However, there is a dearth of information regarding the extent of PAHs pollutant risk and its impact on microbial communities and metabolism within this environment. In this study, the distribution, sources, ecological risk, and microbial community and metabolic response of PAHs in Jiaozhou Bay, Aoshan Bay, and Lingshan Bay in Qingdao, China were investigated. The results showed that the average concentration of ∑PAHs ranged from 120 to 614 ng/L across three bays, with Jiaozhou and Aoshan Bay exhibiting a higher risk than Lingshan Bay due to an increased concentration of high-molecular-weight PAHs. Further analysis revealed a negative correlation between dissolved organic carbon concentration and ∑PAHs concentration in water. Metagenomic analysis demonstrated that higher levels of PAHs can lead to decreased microbial diversity, while the abundance of PAHs-degrading bacteria is enhanced. Additionally, the Erythrobacter, Jannaschia and Ruegeria genera were found to have a significant correlation with low-molecular-weight PAH concentrations. In terms of microbial metabolism, higher PAH concentrations were beneficial for carbohydrate metabolic pathway but unfavorable for amino acid metabolic pathways and membrane transport pathways in natural bay environments. These findings provide a foundation for controlling PAHs pollution and offer insights into the impact of PAHs on bacterial communities and metabolism in natural bay environments.