State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
Key Laboratory of Water and Sediment Sciences (Ministry of Education), College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
Environ Pollut. 2021 Sep 1;284:117157. doi: 10.1016/j.envpol.2021.117157. Epub 2021 Apr 16.
Cyanobacterial blooms have considerable effects on lacustrine microbial communities. The current study explored the temporal pattern of sedimentary archaea and bacteria during cyanobacterial bloom in a eutrophic lake. With the sampling period divided into bloom phase, interval phase and end phase according to the variation of physicochemical parameters, the structures and functions of both kingdoms presented a significant difference among phases. Bloom phases could be characterized with the lowest diversity and up-regulated functions in biodegradation of cyanobacterial metabolites driven by bacteria. Archaeal community showed an increased metabolic function during interval phases, including active methanogenesis sensitive to carbon input. The highest diversity and an enrichment of hub genera in microbial network were both observed in end phase, allowing for closer cooperation among groups involved in cyanobacteria-derived organic matter transformation. Although the archaeal community was less variable or diverse than bacteria, methanogenic functions dramatically fluctuated with cyanobacterial dynamics. And microbial groups related to methane cycling played an important role in microbial network. The results provided new insights into temporal dynamics of lacustrine microbial communities and microbial co-occurrence, and highlighted the significant ecological role of methane cycling-related microbes in lake sediments under the influence of cyanobacterial blooms.
蓝藻水华对湖泊微生物群落有重要影响。本研究探讨了富营养化湖泊蓝藻水华期间沉积物古菌和细菌的时间格局。根据理化参数的变化，将采样期分为水华期、间隔期和末期，两个王国的结构和功能在各期之间存在显著差异。水华期的多样性最低，细菌对蓝藻代谢物的生物降解功能上调。间隔期古菌群落表现出较高的代谢功能，包括对碳输入敏感的活跃产甲烷作用。末期微生物网络的多样性最高，枢纽属富集，参与蓝藻源有机质转化的群体之间的合作更加密切。尽管古菌群落的变异性或多样性低于细菌，但产甲烷功能随蓝藻动态剧烈波动。与甲烷循环相关的微生物群在微生物网络中发挥着重要作用。研究结果为湖泊微生物群落和微生物共生的时间动态提供了新的见解，并强调了甲烷循环相关微生物在蓝藻水华影响下湖泊沉积物中的重要生态作用。
