Diversity of bacterioplankton community during winter and spring in the Lake Zuohai in Fuzhou

Abstract:

Abstract:［Objective］To reveal the diversity of bacterioplankton during winter and spring in Zuohai lake，Fuzhou City，China．［Methods］We constructed 16S rRNA gene clone libraries in the two seasons (January，2012 and April，2012);the Shannon diversity index，Simpson dominance index and Evenness index of the bacterial community in the two samples were compared，and the analysis for the bacterial community structures of this two water samples was conducted．［Results］The Shannon diversity index in January achieved 3. 53，and the Evenness index achieved 0.66; While the Shannon diversity index of April reached 3.37，and the Evenness index reached 0.64．It indicated that the bacterial communities in the two water samples were diverse，but the Evenness indexes were very low． Bacterial belonging to 5 phyla were identified: α-proteobacteria，β-proteobacteria，bacteroidetes，actinobacteria and cyanobacteria．Also，there were many sequences belonging to unidentified bacteria．In January， bacterial community with β-proteobacteria predominated followed by cyanobacteria; while cyanobacteria was the predominant bacterial communities in April.［Conclusion］The distribution of the bacteria in the two seasons has differences，especially the most dominant bacteria differed significantly．In addition，bacterial diversity in the two water samples was high，and compared with in spring，that in winter has higher bacterial diversity，but exit a large number of unidentified bacteria in this environment.