Provincial Key Laboratory of Marine Biotechnology, Institute of Marine Science, Shantou University, Shantou, Guangdong, 515063, China.
Provincial Key Laboratory of Marine Biotechnology, Institute of Marine Science, Shantou University, Shantou, Guangdong, 515063, China; Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, 511458, China.
Chemosphere. 2022 Jul;299:134412. doi: 10.1016/j.chemosphere.2022.134412. Epub 2022 Mar 31.
Anthropogenic activities can adversely impact biogeochemical processes essential for maintaining ecosystem health in semi-enclosed bays. However, the influence of anthropogenic contaminants such as potentially toxic elements on microbial communities that regulate biogeochemical cycles in semi-enclosed bays is poorly understood. We determined the concentrations of four potentially toxic elements (Cu, Zn, Pb, and As) in sediments from a typical tropical semi-enclosed bay in Guangdong, China. Source apportionment using Pearson's correlation analysis revealed that aquaculture activities were probably the primary source of Cu, Zn, and Pb. Using high-throughput sediment DNA sequencing, we found that Proteobacteria was the dominant phylum in sediments. There was no evidence suggesting site-specific variation in microbial function even though sediments adjacent to aquaculture discharge points had higher microbial diversity. In contrast, pollutant-specific variations were observed; for example, Zn and Pd showed potential adverse effects on the environmental information processing function, while As showed a negative correlation with metabolic function. Based on different environmental characteristics, future research should consider the impact of multiple factors on the bacterial community in aquaculture systems.
人为活动会对维持半封闭海湾生态系统健康至关重要的生物地球化学过程产生不利影响。然而，人为污染物（如潜在有毒元素）对调节半封闭海湾生物地球化学循环的微生物群落的影响还知之甚少。本研究测定了中国广东一个典型热带半封闭海湾沉积物中四种潜在有毒元素（Cu、Zn、Pb 和 As）的浓度。通过 Pearson 相关分析进行的来源分配表明，水产养殖活动可能是 Cu、Zn 和 Pb 的主要来源。利用高通量沉积物 DNA 测序，我们发现变形菌门是沉积物中的主要门。尽管养殖排放点附近的沉积物具有更高的微生物多样性，但没有证据表明存在特定地点的微生物功能变化。相反，观察到了污染物特异性的变化；例如，Zn 和 Pd 对环境信息处理功能表现出潜在的不利影响，而 As 与代谢功能呈负相关。基于不同的环境特征，未来的研究应考虑多种因素对养殖系统中细菌群落的影响。
