Spatial and seasonal distributions of bacterioplankton in the Pearl River Estuary: The combined effects of riverine inputs, temperature, and phytoplankton

文献类型： 外文期刊

第一作者： Li, Jiajun

作者： Li, Jiajun;Chen, Zuozhi;Li, Jiajun;Jiang, Xin;Li, Gang;Zhou, Linbin;Zhao, Chunyu;Liu, Jiaxing;Tan, Yehui;Jing, Zhiyou;Zhao, Chunyu;Tan, Yehui

作者机构：

关键词： Bacterioplankton;Pearl River Estuary;16S rRNA sequencing;Monsoon wind;Plume

期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：5.553； 五年影响因子：5.907 ）

ISSN： 0025-326X

年卷期： 2017 年 125 卷 1-2 期

页码：

收录情况： SCI

摘要： In this study, we used flow cytometry and 16S rRNA gene pyrosequencing to investigate bacterioplankton (heterotrophic bacteria and picocyanobacteria) abundance and community structure in surface waters along the Pearl River Estuary. The results showed significant differences in bacterioplankton dynamics between fresh- and saltwater sites and between wet and dry season. Synechococcus constituted the majority of picocyanobacteria in both seasons. During the wet season, Synechococcus reached extremely high abundance at the mouth of the estuary, and heterotrophic bacteria were highly abundant (> 10(6) cells ml(-1)) throughout the studied region. At the same time, bacterioplankton decreased dramatically during the dry season. Pyrosequencing data indicated that salinity was a key parameter in shaping microbial community structure during both seasons. Phytoplankton was also an important factor; the proportion of Synechococcus and Rhodobacteriales was elevated at the frontal zone with higher chlorophyll a during the wet season, whereas Synechococcus were markedly reduced during the dry season.

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