1. Dynamics of the prokaryotic and eukaryotic microbial community during a cyanobacterial bloom.
- Author
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Yilin Qian, Kunihiro Okano, Miwa Kodato, Michiko Arai, Takeru Yanagiya, Qintong Li, Chie Amano, Kakeru Ruike, Tomoaki Itayama, Norio Iwami, Motoo Utsumi, Zhongfang Lei, Zhenya Zhang, Norio Sugiura, and Kazuya Shimizu
- Subjects
CYANOBACTERIAL blooms ,MICROBIAL communities ,PREDATION ,GENE clusters ,BRANCHIOPODA ,GENOTYPES - Abstract
Toxic cyanobacterial blooms frequently develop in eutrophic freshwater bodies worldwide. Microcystis species produce microcystins (MCs) as a cyanotoxin. Certain bacteria that harbor the mlr gene cluster, especially mlrA, are capable of degrading MCs. However, MC-degrading bacteria may possess or lack mlr genes ( mlr
+ and mlr- genotypes, respectively). In this study, we investigated the genotype that predominantly contributes to biodegradation and cyanobacterial predator community structure with change in total MC concentration in an aquatic environment. The 2 genotypes coexisted but mlr+ predominated, as indicated by the negative correlation between mlrA gene copy abundance and total MC concentration. At the highest MC concentrations, predation pressure by Phyllopoda, Copepoda, and Monogononta (rotifers) was reduced; thus, MCs may be toxic to cyanobacterial predators. The results suggest that cooperation between MC-degrading bacteria and predators may reduce Microcystis abundance and MC concentration. [ABSTRACT FROM AUTHOR]- Published
- 2022
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