摘要：To understand the influence of a Microcystis aeruginosa bloom on the bacterioplankton community composition in Lake Xuanwu, water samples were collected during the outbreak and decline of the bloom. Traditional microbial methods and denaturing gradient gel electrophoresis were used to characterize the bacterioplankton community. During the outbreak of bloom, the proportions of firmicutes, bacteroidetes, and -, β-, and γ-proteobacteria were respectively 31.3%, 25.0%, 18. 8%, 12.5%, and 12.5% of the total bacteria. At the decline of the bloom, the total abundance of bacterioplankton increased, and the proportion of γ- proteobacteria increased to 50%. Pseudomonas and Bacillus were always the principal genera but with changing species. Sixteen genera of bacteria were predominant in the community during the outbreak of bloom, but some species of Hydrogenophaga, Vogesella, Sphingomonas, and Exiguobacterium disappeared at the decline of the bloom, and only six predominant genera remained.
