Cite this paper:
Sicheng YIN, Ruohan HUANG, Erik JEPPESEN, Lijing CHEN, Liqing WANG, Xin FANG, Wei ZHANG. The effect of cylindrospermopsin on the bacterioplankton community: a microcosm experiment on water from Dishui Lake, Shanghai, China[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1829-1839

The effect of cylindrospermopsin on the bacterioplankton community: a microcosm experiment on water from Dishui Lake, Shanghai, China

Sicheng YIN1, Ruohan HUANG1, Erik JEPPESEN2,3,4,5, Lijing CHEN1, Liqing WANG1, Xin FANG6, Wei ZHANG1
1 Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China;
2 Department of Ecoscience, Aarhus University, Silkeborg 8600, Denmark;
3 Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing 100049, China;
4 Limnology Laboratory and EKOSAM, Department of Biological Sciences, Middle East Technical University, Ankara 06800, Turkey;
5 Institute of Marine Sciences, Middle East Technical University, Mersin 33731, Turkey;
6 School of Business, Macau University of Science and Technology, Taipa, Macao 999078, China
Eutrophication and climate warming have intensified the global expansion of invasive cyanobacteria such as Cylindrospermopsis spp. and Chrysosporum spp. Cylindrospermopsin (CYN) produced by species of the latter two genera may harm phytoplankton, zooplankton, and fishes. However, effects of CYN on the bacterioplankton community have not been studied. Based on high-throughput sequencing, we explored the effect of CYN on the structure and function of the bacterioplankton community by adding pure CYN to in- situ water collected from a brackish coastal shallow lake: Dishui Lake, China. We found that most bacterioplankton taxa had a certain tolerance potential to CYN, but that high concentrations of CYN (40 μg/L) caused a significant decrease in microbial abundance and functional groups. Of the dominant phyla, Actinobacteria had the strongest tolerance to CYN. Network analysis indicated that CYN caused shifts in the community structure of the bacterioplankton, reducing community stability and structural complexity. High CYN concentrations also reduced the correlation between the different bacterioplankton groups, and the abundances of some bacterial taxa associated with the denitrification function and the process of carbon transfer in the microbial food web were inhibited. Our study provides new insight into the response of the bacterioplankton communities to harmful algal toxins produced by cyanobacteria.
Key words:    cylindrospermopsin    bacterioplankton    denitrification function    carbon cycles    Dishui Lake   
Received: 2022-02-27   Revised: 2022-04-02
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