Hu Yang, Xie Guijuan, Jiang Xingyu, Shao Keqiang, Tang Xiangming, Gao Guang
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China.
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Beijing, China.
Front Microbiol. 2020 Mar 25;11:423. doi: 10.3389/fmicb.2020.00423. eCollection 2020.
Exploring the relationships between free-living (FL) and particle-attached (PA) bacterial communities can provide insight into their connectivity and the partitioning of biogeochemical processes, which is crucial to understanding the elemental cycles and metabolic pathways in aquatic ecosystems. However, there is still intense debate about that whether FL and PA fractions have the same assemblage. To address this issue, we investigated the extent of similarity between FL and PA bacterial communities along the environmental gradients in Lake Wuli, China. Our results revealed that the west Lake Wuli was slightly eutrophic and the east lake was moderately and highly eutrophic. The alpha-diversity of the FL bacterial communities was significantly lower than that of the PA fraction in the west lake, whereas the alpha-diversity of the two fractions was comparable in the east lake. The beta-diversity of both communities significantly differed in the west lake, whereas it resembled that in the east lake. Moreover, functional prediction analysis highlighted the significantly larger differences of metabolic functions between the FL and PA fractions in the west lake than in the east lake. Suspended particles and carbon resource promote the similarity between the FL and PA fractions. Collectively, our result reveals a convergent succession of aquatic communities along the eutrophic gradient, highlighting that the connectivity between FL and PA bacterial communities is nutrient related.
探索自由生活（FL）细菌群落与附着颗粒（PA）细菌群落之间的关系，有助于深入了解它们的连通性以及生物地球化学过程的分配情况，这对于理解水生生态系统中的元素循环和代谢途径至关重要。然而，关于FL和PA组分是否具有相同的组合仍存在激烈争论。为了解决这个问题，我们研究了中国五里湖沿环境梯度的FL和PA细菌群落之间的相似程度。我们的结果表明，五里湖西部略显富营养化，东部为中度和高度富营养化。西湖中FL细菌群落的α多样性显著低于PA组分，而在东湖中，这两个组分的α多样性相当。西湖中两个群落的β多样性显著不同，而在东湖中则相似。此外，功能预测分析突出显示，西湖中FL和PA组分之间的代谢功能差异比东湖中显著更大。悬浮颗粒和碳源促进了FL和PA组分之间的相似性。总体而言，我们的结果揭示了水生群落沿富营养化梯度的趋同演替，强调FL和PA细菌群落之间的连通性与营养物质有关。
