Different Assembly Patterns of Planktonic and Sedimentary Bacterial Community in a Few Connected Eutrophic Lakes

Water

卷:14

Yuanyuan Chen¹  Jixin Yu¹  Ying Wang¹  Dongdong Zhai¹  Ming Xia¹  Hongyan Liu¹  Fei Xiong¹  Zhicong Wang²  Dunhai Li²  Xuemei Li³ 

[1] Hubei Engineering Research Center for Protection and Utilization of Special Biological Resources in the Hanjiang River Basin, School of Life Sciences, Jianghan University, Wuhan 430056, China;

[2] State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;

[3] Yangtze River Fisheries Research Institute, Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Wuhan 430223, China;

关键词: bacterial community assembly;    eutrophication;    freshwater lake;    stochastic process;    deterministic process;   

DOI  :  10.3390/w14050723

来源: DOAJ

【 摘 要 】

The mechanism of bacterial community assembly has been the hot spot in the field of microbial ecology and it is difficult to quantitatively estimate the influences of different ecological processes. Here, a total of 23 pairs of planktonic and sedimentary samples were collected from five lakes in Wuhan, China. significant higher α-diversity (p < 0.001) and β-diversity (p < 0.001) of bacterial communities were observed in sediment than those in water. Some phylum had linear relationships with the comprehensive TSI (TSIc) by regression analysis. Non-metric multidimensional scaling (NMDS) and redundancy analysis (RDA) revealed that the depth of water, NO₃⁻-N, NH₄⁺-N, PO4³⁻, and COD_cr were the key environmental variables in planktonic bacterial communities, whereas in sediment they were the depth, NO₃⁻-N, and NH₄⁺-N. Furthermore, variation partitioning analysis (VPA) showed that spatial and environmental factors could only explain 40.2% and 27.9% of the variation in planktonic and sedimentary bacterial communities, respectively. More importantly, null model analysis suggested that different assembly mechanisms were found between in water and in sediment with the fact that planktonic bacterial community assembly was mainly driven by dispersal limitation process whereas variable selection process played a vital role in that of sediment.

【 授权许可】

Unknown