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首页> 外文期刊>Aquatic Sciences >Picophytoplankton community dynamics in a tropical river estuary and adjacent semi-enclosed water body
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Picophytoplankton community dynamics in a tropical river estuary and adjacent semi-enclosed water body

机译：Picophytoplankton在热带河口和邻近半封闭水体中的群体动态

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The dynamics of picophytoplankton, a vital component of the aquatic microbial food web, are least explored in the river-dominated estuaries, especially those subjected to human modifications that can alter the hydrodynamics and the biota. Here, picophytoplankton community dynamics was assessed seasonally and spatially in the tropical monsoon-influenced Hooghly River estuary and an adjacent semi-enclosed dock. We hypothesized that the seasonal and spatial picophytoplankton community structure and abundance would be controlled by synergistic effects of the environmental and hydrographic factors with different responses in the semi-enclosed water body compared to the flowing estuary. The relatively lower turbidity and higher water transparency suggest that the dock's water residence time was relatively longer than the estuary due to its semi-enclosed nature. A phycocyanin-rich Synechococcus group dominated the community seasonally and spatially throughout the study region, with the highest population during the pre-monsoon. The higher water temperature, salinity, transparency, and residence time were the supporting factors. During the warm monsoon season, the relatively lower abundance of the phycocyanin-rich Synechococcus group despite the high nutrient concentrations implied impairment of growth due to high turbidity, low light availability, and residence time. However, the relatively higher salinity, water transparency, lower turbidity due to a longer residence time failed to stimulate the picophytoplankton during the cooler post-monsoon, suggesting temperature as the main controlling factor. Seasonal introduction of phycoerythrin-rich Synechococcus and two other picocyanobacteria (freshwater Microcystis and Cyanobium like) groups ensued from the open sea and river, respectively, due to varying hydrodynamics. The presence of the latter picocyanobacteria group during non-monsoon indicates higher salinity tolerance. Among the two zones, the higher abundance of picophytoplankton in the dock implies the stimulatory effect of the relatively higher water transparency, longer residence time, and enhanced resource utilization capabilities. A synergistic role of environmental parameters and hydrodynamics becomes apparent from these observations, thereby supporting the hypothesis.
机译：Picophytoplankton是水生微生物食品网的重要组成部分的动态，在河流主导的河道中最不探讨，特别是那些对人体修饰进行的人可以改变流体动力学和生物群。这里，在热带季风影响的舟河河口和相邻的半封闭船坞中，季节性季节性群体动态进行了季节性和空间。我们假设季节性和空间皮肤科群落结构和丰富将通过与流动河口相比，半封闭水体中不同响应的环境和水文因素的协同效应来控制。相对较低的浊度和更高的水透明度表明，由于其半封闭性质，码头的水停留时间比河口相对长。富含植物植物富含植物蛋白的同胞球菌集团在整个研究区域季节性和空间上统治社区，在季风前的人口最高。水温，盐度较高，盐度，透明度和停留时间是支撑因素。在温暖的季风季节期间，富含植物素富含的嗜孢子素的肌肉蛋白酶组的丰富性较高，尽管高营养浓度暗示增长由于高浊度，低光可用性和停留时间。然而，相对较高的盐度，水透明度，由于较长的停留时间而导致的浊度下降未能在冰柱后季后遇期间刺激皮肤上的肌肉，建议温度作为主要控制因子。富含植物植物植物的植物和其他野猪（淡水微囊纤维和Cyanobium）的季节性引入分别由于流体动力学不同，分别从开放的海洋和河流中出发。在非季风期间，后一种野糖细菌基团表明盐度较高。在两个区域中，码头中的腓育率较高暗示了相对较高的水透明度，较长的停留时间和增强的资源利用能力的刺激效果。环境参数和流体动力学的协同作用从这些观察结果中变得显而易见，从而支持假设。

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