Recruitment-promoting of dormant Microcystis aeruginosa by three benthic bacterial species

文献类型： 外文期刊

第一作者： Zou, Wansheng

作者： Zou, Wansheng;Wang, Zhi;Tang, Shaoxian;Zou, Wansheng;Song, Qisheng;Peng, Yuande;Wang, Zhi

作者机构：

关键词： Benthic bacteria; Microcystis aeruginosa; Sediment; Recruitment-promoting

期刊名称：HARMFUL ALGAE （ 影响因子：4.273； 五年影响因子：5.824 ）

ISSN： 1568-9883

年卷期： 2018 年 77 卷

页码：

收录情况： SCI

摘要： The frequent occurrence of Microcystis aeruginosa blooms benefit from the dormant Microcystis cells, which will be recruited from sediment into overlying water to form a dominant population and algal blooms when external environmental conditions are suitable. Previous studies have unveiled factors involved in M. aeruginosa recruitment and bloom initiation, including nutrition, illumination, temperature, and hydrodynamic force. In this study, three dominant benthic bacterial species isolated from Lake Chongtian with frequent blooms-forming were identified through next generation sequencing (NGS) techniques, and laboratory experiments were conducted on the recruitment of dormant M. aeruginosa cells via co-culture with these bacteria at 10 degrees C, 15 degrees C, 20 degrees C and 25 degrees C. The results showed that the bacterial strains in sediment proliferated quickly before recruitment of dormant M. aeruginosa cells, subsequently significantly promoted the recruitment of dormant M. aeruginosa via allelochemical (metabolite) production, lower N:P values and lower dissolved oxygen concentrations in the sediment-water interface, and enhanced photosynthesis of M. aeruginosa cells. Furthermore, dormant M. aeruginosa was recruited from sediment at 10 degrees C when bacterial activity was present, but not recruited when bacterial activity was absent. At 15 degrees C,20 degrees Cand 25 degrees C, there were no remarkable differences in the recruitment rate of dormant M. aeruginosa cells among all bacterial groups, although their recruitment rate were significantly higher than that at 10 degrees C.These findings suggested that, under laboratory conditions, three benthic bacteria not only had a great influence on promoting the recruitment of dormant M. aeruginosa cells under desirable temperatures, but also can spur recruitment of dormant M. aeruginosacells from sediment at lower temperature (10 degrees C).

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