Spatial and temporal variation in phytoplankton assemblage and their species responses with varying salinity regimes were investigated in the Hooghly Matlah estuary, India during two annual period. The exhaustive survey in the ten sampling stations recorded 132 species of phytoplankton belonging to 95 genera. The study revealed 12 taxonomic algal groups with the dominance of class Bacillariophyceae (43 species). Indicator species analysis revealed the dominance of Aulacoseira granulata, Scenedesmus quadricauda, Eudorina sp. and Protococcus sp. in the tidal freshwater zone while a higher proportion of Pleurosigma sp., Synedra sp. and Coscinodiscus sp. were observed in the intermediate zone. The middle and lower estuary were dominant with Cyclotella sp. and Closterium sp. in upper Sundarbans and Entomoneis sp. and Chaetoceros sp. in lower Sundarbans. Species response curve using GAM modelling was performed to identify the taxa that had their population maximum in various saline zones of the estuary.

中文翻译：

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盐度变化驱动恒河口浮游植物动态：来自沿纵向河口梯度的物种响应和污染指标建模方法的见解


在印度胡格利马特拉河口研究了浮游植物组合的时空变化及其物种对不同盐度状况的响应，为期两年。对 10 个采样站的详尽调查记录了属于 95 个属的 132 种浮游植物。该研究揭示了 12 个分类藻类群，其中以 Bacillariophyceae 类（43 个物种）为主。指示物种分析显示，Aulacoseira granulata、Scenedesmus quadricauda、Eudorina sp. 和 Protococcus sp. 在潮汐淡水区占主导地位，而在中间区观察到 Pleurosigma sp.、Synedra sp. 和 Coscinodiscus sp. 的比例较高。中下河口以上孙德尔本斯的 Cyclotella sp. 和 Closterium sp. 为主，下孙德尔本斯的 Entomoneis sp. 和 Chaetoceros sp. 占主导地位。使用 GAM 模型进行物种响应曲线，以确定在河口各个盐水区种群数量最多的分类群。