Zhou Lei, Wang Pengfei, Huang Shihui, Li Zongyang, Gong Hongzhao, Huang Wenjing, Zhao Zelong, Yu Zonghe
Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China.
Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510300, China.
Environ Res. 2021 May;196:110934. doi: 10.1016/j.envres.2021.110934. Epub 2021 Feb 27.
Estuaries are important in terms of biodiversity, biogeochemical function, and ecological balance due to their intense land-sea interactions. The sustainability of estuarine ecosystem function relies on a good understanding of the ecological processes related to microbial communities. However, microbial community assembly in such ecosystems is still not well understood. Here, based on 16S rRNA sequencing, we investigated the bacterioplankton community structure in the Pearl River Estuarine system during the wet and dry seasons. Results showed that there were significant seasonal and spatial variations in the bacterioplankton communities of the estuary, with seasonal variations being more remarkable. Multiple bacterioplankton with different abundances in the wet and dry seasons were observed, e.g., the class Actinobacteria and Oxyphotobacteria were enriched in the wet season, whereas Alphaproteobacteria and Saccharimonadia were more abundant in the dry season. Both variation partitioning and null model analysis revealed that environmental filtering dominated the bacterioplankton community assembly in the Pearl River Estuary. Water physical properties (e.g., salinity and temperature), nutrient content (e.g., nitrate), and upstream land use (e.g., urban land cover) together determined the distribution of the bacterioplankton composition in this highly urbanized estuarine ecosystem. These findings would help improve our understanding of the bacterioplankton communities in estuarine ecosystems and provide a theoretical foundation for estuarine ecological health management.
由于河口地区陆地与海洋的强烈相互作用，它们在生物多样性、生物地球化学功能和生态平衡方面具有重要意义。河口生态系统功能的可持续性依赖于对与微生物群落相关的生态过程的深入理解。然而，此类生态系统中微生物群落的组装仍未得到充分了解。在此，基于16S rRNA测序，我们调查了珠江河口系统在雨季和旱季的浮游细菌群落结构。结果表明，河口浮游细菌群落存在显著的季节和空间变化，其中季节变化更为显著。观察到在雨季和旱季有多种丰度不同的浮游细菌，例如放线菌纲和嗜氧光细菌纲在雨季富集，而α-变形菌纲和糖单胞菌纲在旱季更为丰富。变异分解和空模型分析均表明，环境过滤主导了珠江河口浮游细菌群落的组装。水的物理性质（如盐度和温度）、营养成分（如硝酸盐）以及上游土地利用（如城市土地覆盖）共同决定了这个高度城市化河口生态系统中浮游细菌组成的分布。这些发现将有助于增进我们对河口生态系统中浮游细菌群落的理解，并为河口生态健康管理提供理论基础。
