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We investigated the dynamics of the bacterial composition and metabolic function within  Akashiwo sanguinea  bloom using a 100-L indoor microcosm and metagenomic next-generation sequencing. We found that the bacterial community was classified into three groups at 54% similarity. Group I was associated with “during the  A. sanguinea  bloom stage” and mainly consisted of Alphaproteobacteria, Flavobacteriia and Gammaproteobacteria. Meanwhile, groups II and III were associated with the “late bloom/decline stage to post-bloom stage” with decreased Flavobacteriia and Gammaproteobacteria in these stages. Upon the termination of the  A. sanguinea  bloom, the concentrations of inorganic nutrients (particularly PO 4  3− , NH 4  +  and dissolved organic carbon) increased rapidly and then decreased. From the network analysis, we found that the  A. sanguinea  node is associated with certain bacteria. After the bloom, the specific increases in NH 4  +  and PO 4  3−  nodes are associated with other bacterial taxa. The changes in the functional groups of the bacterial community from chemoheterotrophy to nitrogen association metabolisms were consistent with the environmental impacts during and after  A. sanguinea  bloom. Consequently, certain bacterial communities and the environments dynamically changed during and after harmful algal blooms and a rapid turnover within the bacterial community and their function can respond to ecological interactions.

Dynamic bacterial community response to Akashiwo sanguinea (Dinophyceae) bloom in indoor marine microcosms