State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Joint International Research Laboratory of Global Change and Water Cycle, Hohai University, Xikang Road 1, Nanjing, 210098, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China.
BMC Microbiol. 2019 Sep 4;19(1):207. doi: 10.1186/s12866-019-1585-5.
The decomposition of Microcystis can dramatically change the physicochemical properties of freshwater ecosystems. Bacteria play an important role in decomposing organic matters and accelerating the cycling of materials within freshwater lakes. However, actions of the bacterial community are greatly influenced by temperature and the amount of organic matter available to decompose during a bloom. Therefore, it is vital to understand how different temperatures and biomass levels affect the bacterial community during the decomposition of Microcystis.
Microcystis addition reduced the diversity of bacterial community. The composition of bacterial community differed markedly between samples with different biomass of Microcystis (no addition, low biomass addition: 0.17 g/L, and high biomass addition: 0.33 g/L). In contrast, temperature factor did not contribute much to the different bacterial community composition. Total nitrogen (TN), total phosphorus (TP), total organic carbon (TOC), ammonia nitrogen (NH-N) and oxidation-reduction potential (ORP) were the key measured environmental variables shaping the composition of bacterial community.
Decomposition of Microcystis changed the physicochemical characteristics of the water and controlled the diversity and composition of the bacterial community. Microcystis biomass rather than temperature was the dominant factor affecting the diversity and composition of the bacterial community.
微囊藻的分解会显著改变淡水生态系统的理化性质。细菌在分解有机物和加速淡水湖中物质循环方面发挥着重要作用。然而，细菌群落的作用受到温度和分解过程中可用有机物数量的极大影响。因此，了解不同温度和生物量水平如何影响微囊藻分解过程中的细菌群落至关重要。
微囊藻的添加降低了细菌群落的多样性。不同微囊藻生物量（无添加、低生物量添加：0.17 g/L 和高生物量添加：0.33 g/L）的样品之间，细菌群落的组成有明显差异。相比之下，温度因素对不同的细菌群落组成没有多大贡献。总氮（TN）、总磷（TP）、总有机碳（TOC）、氨氮（NH-N）和氧化还原电位（ORP）是塑造细菌群落组成的关键环境变量。
微囊藻的分解改变了水的理化特性，控制了细菌群落的多样性和组成。微囊藻生物量而不是温度是影响细菌群落多样性和组成的主要因素。
