Seasonal succession of bacterial communities in cultured detected by high-throughput sequencing.

An increasing number of microorganisms are being identified as pathogens for diseases in macroalgae, but the species composition of bacteria related to , fresh edible green macroalgae worldwide, remains largely unclear. The bacterial communities associated with were investigated by high-throughput 16S rDNA sequencing, and the bacterial diversities in washed and control groups were compared in this study. A total of 4,388 operational taxonomic units were obtained from all the samples, and the predominant prokaryotic phyla were , , , , , , , and in . The bacterial diversity changed with seasons and showed an increasing trend of diversity with the rising temperature in . There were slight reductions in the abundance and diversity of bacteria after washing with tap water for 2 h, indicating that only parts of the bacterial groups could be washed out, and hidden dangers in still exist. Although the reduction in the abundance of some bacteria revealed a positive significance of washing with tap water on food safety, more effective cleaning methods still need to be explored.