Cite this paper:
Qianzhi WEN, Peng XIAO, Hua LI, Wenke LI, Gongliang YU, Renhui LI. Succession of Aphanizomenon flos-aquae and Microcystis aeruginosa in direct co-culture experiments at different temperatures and biomasses[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1819-1828

Succession of Aphanizomenon flos-aquae and Microcystis aeruginosa in direct co-culture experiments at different temperatures and biomasses

Qianzhi WEN1,2, Peng XIAO3, Hua LI1, Wenke LI1,2, Gongliang YU1, Renhui LI3
1 Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 College of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China
Cyanobacterial blooms have become a serious global environmental issue due to their potential risk for releasing detrimental secondary metabolites into aquatic ecosystems, posing a great threat to water quality management for public health authorities. Aphanizomenon, a common filamentous cyanobacterial genus belonging to Nostocales, is under particular concern because its several members are able to form harmful blooms. Furthermore, succession of bloom between A. flos-aquae and Microcystis occurs in many natural lakes. To evaluate the competitiveness of A. flos-aquae vs. M. aeruginosa, two sets of experiments at different ratios of biomass at 15 �C and 25 �C were conducted. Results show that at 15 �C, the two species were able to coexist, and A. flos-aquae showed a specific higher growth rate, and its growth was promoted by the presence of M. aeruginosa. At 25 �C, the growth of A. flos-aquae was inhibited by the biomass of M. aeruginosa, and M. aeruginosa suppressed A. flos-aquae in competition. Additionally, the vegetative cell size of A. flos-aquae was significantly influenced by the co-culture with M. aeruginosa, whereas the filament length of A. flos-aquae was not significantly affected. This study confirms that temperature is the dominating factor on the succession of A. flos-aquae and M. aeruginosa of a different biomass.
Key words:    cyanobacterial bloom    Aphanizomenon flos-aquae    Microcystis aeruginosa    succession    temperature    biomass   
Received: 2022-01-27   Revised: 2022-03-08
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