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

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Abstract

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.

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Data Availability Statement

All data generated and/or analyzed during this study are available from the corresponding author on reasonable request.

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Acknowledgment

We thank the Wuhan Branch, Supercomputing Center, Chinese Academy of Sciences, for providing computing facilities, and all staff from the Analysis and Testing Center at Institute of Hydrobiology, CAS, for technical supports.

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Correspondence to Gongliang Yu or Renhui Li.

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Supported by the National Key Research and Development Program of China (No. 2017YFA0605201), the Major Project of Natural Science Foundation of Zhejiang Province (No. LD21C030001), the National Natural Science Foundation of China (No. 51779247), the Controlling Technology of Cyanobacterial Bloom in the Major Lakes of Wuhan city (No. HBT-16200117-201482), and the Featured Institute Service Project from Institute of Hydrobiology, Chinese Academy of Sciences (No. Y85Z061601)

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Wen, Q., Xiao, P., Li, H. et al. Succession of Aphanizomenon flos-aquae and Microcystis aeruginosa in direct co-culture experiments at different temperatures and biomasses. J. Ocean. Limnol. 40, 1819–1828 (2022). https://doi.org/10.1007/s00343-022-2041-1

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  • DOI: https://doi.org/10.1007/s00343-022-2041-1

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