Wang Xun, Zhang Jia-Jia, Yuan Qiu-Sheng, Hu Bin, Liu Sheng
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China.
College of Environment, Hohai University, Nanjing 210098, China.
Huan Jing Ke Xue. 2022 Jul 8;43(7):3623-3634. doi: 10.13227/j.hjkx.202109104.
Microbial communities play an important role in ecological processes through direct or indirect interactions. However, the interspecific interaction pattern of reservoir microorganisms has still received little attention. The Hengshan Reservoir in Jiangsu province was selected as the research area. Surface and deep water samples were collected to respectively explore the response of planktonic microbial community structure and the molecular ecological network to water depth changes, as well as to identify the key species of planktonic microbial communities in different water depths. The results showed that the richness and evenness of planktonic microorganisms in the surface layer were higher than those in the deep layer, and there were significant differences in the community structure of planktonic microorganisms in different depths. Water depth indirectly affected the planktonic microbial community by changing the environmental heterogeneity, among which the indicators such as TOC, NO, NH, and PO had the most significant impact on the planktonic microbial community structure. In addition, the number of nodes and edges of the deep planktonic microbial molecular ecological network were significantly higher than those on the surface, and the type and number of key species in the deep planktonic microbial community were significantly higher than those on the surface, indicating that the network scale of the deep planktonic microbial community was larger; however, the interspecific cooperative relationship and network connectivity of the surface planktonic microbial community were stronger. These results will provide a scientific basis for the study of interspecific interactions of reservoir microbial communities and are of great significance for predicting the ecological law of microorganisms in reservoir ecosystems and the impact of global material cycles.
微生物群落通过直接或间接相互作用在生态过程中发挥重要作用。然而，水库微生物的种间相互作用模式仍很少受到关注。选取江苏省横山水库作为研究区域。采集表层和深层水样，分别探究浮游微生物群落结构和分子生态网络对水深变化的响应，以及识别不同水深浮游微生物群落的关键物种。结果表明，表层浮游微生物的丰富度和均匀度高于深层，不同深度浮游微生物的群落结构存在显著差异。水深通过改变环境异质性间接影响浮游微生物群落，其中TOC、NO、NH和PO等指标对浮游微生物群落结构影响最为显著。此外，深层浮游微生物分子生态网络的节点数和边数显著高于表层，深层浮游微生物群落中关键物种的类型和数量显著高于表层，表明深层浮游微生物群落的网络规模更大；然而，表层浮游微生物群落的种间合作关系和网络连通性更强。这些结果将为水库微生物群落种间相互作用的研究提供科学依据，对预测水库生态系统中微生物的生态规律以及全球物质循环的影响具有重要意义。
