School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China.
Sci Total Environ. 2020 Jun 1;719:137387. doi: 10.1016/j.scitotenv.2020.137387. Epub 2020 Feb 20.
Aquatic bacterial communities play crucial roles in the circulation of nutrients in watershed ecosystems. However, the interaction between bacterial communities and chromophoric dissolved organic matter (CDOM) in freshwater ecosystems has not been studied in depth. In our study, we examined the constitution and interactions of CDOM with the bacterial community in Lake Chaohu and its inflow rivers under the influence of different exogenous pollutants. The results revealed that the bacterial community diversity in the inflow rivers was significantly lower than that in the lake sites. Clustering of different types of polluted inflow rivers integrated with the most abundant genera observed in specific areas indicated that environmentally guided species selection had a large impact on the composition of aquatic bacterial communities. Moreover, our study suggests that communities in lake environments may be more susceptible to interference through a variety of physiologies or via functional redundancy, allowing them to preserve their community structure. Through linear discriminant analysis effect size (Lefse) methods, we revealed that some taxa (from phylum to genus) were consistently enriched in the lake sites. Based on correlation network analysis results, the supersession niches of bacterial community members related to different CDOM in the biogeochemical process was determined. This study provides an ecological basis for the control of external pollution and the protection of the water environment in watershed ecosystems.
水生细菌群落在流域生态系统养分循环中发挥着关键作用。然而，在淡水生态系统中，细菌群落与发色溶解有机物质（CDOM）之间的相互作用尚未得到深入研究。在我们的研究中，我们考察了在不同外源污染物影响下，巢湖及其入湖河流中 CDOM 与细菌群落的组成和相互作用。结果表明，入湖河流中的细菌群落多样性明显低于湖体站点。受特定区域中最丰富属影响的不同类型污染入湖河流的聚类表明，受环境引导的物种选择对水生细菌群落的组成有很大影响。此外，我们的研究表明，湖泊环境中的群落可能更容易受到各种生理机能或功能冗余的干扰，从而保持其群落结构。通过线性判别分析效应量（Lefse）方法，我们揭示了一些类群（从门到属）在湖体站点中一直丰富存在。基于相关网络分析结果，确定了与生物地球化学过程中不同 CDOM 相关的细菌群落成员的替代生态位。本研究为控制流域生态系统的外源污染和保护水环境提供了生态基础。
