The phytoplankton diversity and community response to physicochemical variables in mangrove zones of Guangdong Province along the South China coast was investigated from October to December, 2017. This study was set to investigate the phytoplankton community structure in the mangrove zone and assess the relationship between the physicochemical variables and phytoplankton species diversity. Physicochemical variables such as water temperature, total dissolve solids (tds), pH, salinity, turbidity, electrical conductivity (EC) and nutrient salts were measured in situ across the 27 stations. A total of 451 species of phytoplankton were identified belonging to 10 groups (Bacillariophta > Cyanophyta > Chlorophyta > Euglenophyta > Dinoflagellate > Eubacteria > Ochrophyta > Crytophyta > Rhodophyta > Charophyta) and quantified to constitute a standing crop of 7.11 × 108 cells dm-3. The principal component analysis (PCA) reveals that reactive nitrate, phosphate, electrical conductive (EC) and turbidity were the best abiotic factors that controlled the phytoplankton community structure in the area. However, Cannon Corresponding Analysis and Pearson correlation have explicitly revealed the impact of reactive nitrate, phosphate, EC and turbidity on the phytoplankton community structure. For instance, the CCA ordination revealed that species richness and evenness were positively influenced by reactive nitrate but negatively affected by EC, turbidity and water temperature. Diatoms were mostly controlled by total dissolved solids (tds) and salinity, whereas Euglena, cyanobacteria and green algae were impacted EC and turbidity, apart from the general contribution of the nutrient salts as delineated by CCA ordination. The Shannon diversity index value exposed different levels of organic pollution across the mangrove zone of which GD37 was the most impacted station.

中文翻译：

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广州市红树林区浮游植物的多样性和对理化变量的群落响应。

于2017年10月至2017年12月调查了广东省华南沿海红树林区浮游植物的多样性和对理化变量的群落响应。本研究旨在调查红树林区浮游植物的群落结构，并评估其与理化指标之间的关系。变量和浮游植物物种多样性。在27个站点上现场测量了诸如水温，总溶解固体（tds），pH，盐度，浊度，电导率（EC）和营养盐等理化变量。总共确定了451种浮游植物，属于10类（细菌杆菌科>蓝藻科>绿藻科>裸藻科>鞭毛藻>真细菌>毛鳞鱼>隐藻>红藻> Charophyta）并量化为7.11×108个细胞dm-3的立株。主成分分析（PCA）显示，反应性硝酸盐，磷酸盐，导电性（EC）和浊度是控制该地区浮游植物群落结构的最佳非生物因子。但是，Cannon对应分析和Pearson相关性已明确揭示了活性硝酸盐，磷酸盐，EC和浊度对浮游植物群落结构的影响。例如，CCA指令显示，物种的丰富度和均匀度受到活性硝酸盐的正影响，而受到EC，浊度和水温的负面影响。硅藻主要受总溶解固体（tds）和盐度控制，而Euglena，蓝细菌和绿藻受到EC和浊度的影响，除了CCA规定的营养盐的一般贡献外。香农多样性指数值暴露了整个红树林区不同程度的有机污染，其中GD37是受影响最严重的台站。