Zhao Dayong, Xu Huimin, Zeng Jin, Cao Xinyi, Huang Rui, Shen Feng, Yu Zhongbo
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China.
College of Hydrology and Water Resources, Hohai University, Xikang Road 1, Nanjing 210098, China.
FEMS Microbiol Ecol. 2017 Jun 1;93(6). doi: 10.1093/femsec/fix062.
Although previous studies have compared the diversity and community composition of free-living (FL) and particle-attached (PA) bacterial groups in marine ecosystems, few studies have focused on the FL and PA bacterial communities in large and shallow eutrophic lakes. Furthermore, the assembly processes of the FL and PA bacterial communities have not been investigated. To illustrate the differences between PA (≥5.0 μm) and FL (0.22-5.0 μm) bacterial communities, samples were collected from 13 different sites in Taihu Lake, China. A higher diversity of the PA bacterial group than that of the FL group was observed, and significant differences in bacterial community composition between FL and PA groups were found (analysis of similarity, R = 0.2425, P < 0.001). Moreover, the two groups exhibited different relationships with environmental factors and geographic distance. Environmental factors played more important roles in affecting the FL bacterial community. A deterministic process was found as the primary factor driving the community of FL bacteria in Taihu Lake. However, the PA bacterial group was characterized by insignificant results of partial Mantel tests, which indicated that the community assembly was controlled by unknown processes.
尽管先前的研究比较了海洋生态系统中自由生活（FL）和附着颗粒（PA）细菌群的多样性和群落组成，但很少有研究关注大型浅水富营养湖泊中的FL和PA细菌群落。此外，FL和PA细菌群落的组装过程尚未得到研究。为了阐明PA（≥5.0μm）和FL（0.22 - 5.0μm）细菌群落之间的差异，从中国太湖的13个不同地点采集了样本。观察到PA细菌群的多样性高于FL群，并且发现FL和PA群之间的细菌群落组成存在显著差异（相似性分析，R = 0.2425，P < 0.001）。此外，两组与环境因素和地理距离表现出不同的关系。环境因素在影响FL细菌群落方面发挥了更重要的作用。发现确定性过程是驱动太湖FL细菌群落的主要因素。然而，PA细菌群的部分Mantel检验结果不显著，这表明群落组装受未知过程控制。
