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首页> 外文期刊>Lakes & Reservoirs >Planktonic and physico–chemical dynamics of a markedly fluctuating backwater pond associated with a lowland river (Salado River, Buenos Aires, Argentina)
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Planktonic and physico–chemical dynamics of a markedly fluctuating backwater pond associated with a lowland river (Salado River, Buenos Aires, Argentina)

机译：与低地河流（萨拉多河，布宜诺斯艾利斯，阿根廷）相关的明显波动的回水池塘的浮游和物理化学动力学

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摘要

An investigation was performed in a pond (San Miguel) directly associated with the Salado River (Pampean grasslands). The aim of the study was to analyze river interactions. Physical and chemical conditions and the plankton community were studied in order to determine the effects of changes in hydrological conditions. The main factors that influenced the physical–chemical characteristics of the pond have been identified by means of cluster analysis. Conductivity was the main factor that determined groups in sampling periods. Changes in conductivity were clearly associated with the water-level of the pond and depended on the flow of the Salado River and fluctuations of its conductivity, which is itself a function of evaporation and the inflow of underground water of high conductivity. Other factors that affected the physical–chemical conditions included concentrations of phosphorus and polyphenols, the main allocthonous sources. The concentration of these compounds was decreased in low water conditions. Principal Components Analysis suggested that there were four major regulatory factors in the pond, as follows. First, a dry season, with a prolonged isolation phase and a considerable increase in conductivity, turbidity and suspended solids, during which the abundance of plankton was greatly reduced, as were incorporated benthic species. A high and sudden increase of river flow determines the second regulatory factor, the flood season, when dissolved allocthonous material enters, conductivity decreases and there is a conspicuous dominance of cyanophytes, protozoans and crustaceans. The different degrees of hydrological connection with the Salado River produce changes in dissolved phosphorus forms and the composition of the plankton. The third regulatory factor is an increase in particulate material. This is associated with the highest total phosphorus values as a consequence of the phosphorus– particle relationship. The opposite situation, the fourth regulatory factor (a decrease in particulate material), produces clear water conditions with a dominance of chlorophytes, planktonic diatoms and rotifers.
机译：在与萨拉多河（潘潘草原）直接相关的池塘（圣米格尔）中进行了调查。该研究的目的是分析河流之间的相互作用。研究了物理和化学条件以及浮游生物群落，以确定水文条件变化的影响。通过聚类分析确定了影响池塘理化特性的主要因素。电导率是决定采样周期中各组的主要因素。电导率的变化显然与池塘的水位有关，并且取决于萨拉多河的流量及其电导率的波动，而电导率的变化本身就是蒸发和高电导率的地下水流入的函数。影响物理化学条件的其他因素包括磷和多酚的浓度，这是主要的异辛源。这些化合物的浓度在低水条件下降低。主成分分析表明，池塘中存在四个主要调控因素，如下所示。首先，旱季，隔离期延长，电导率，浊度和悬浮固体大量增加，在此期间浮游生物的丰度大大降低，底栖生物也被纳入其中。河流流量的突然高增决定了第二个调节因素，即洪水季节，当溶解的所有辛烯类物质进入时，电导率下降，并且蓝藻，原生动物和甲壳类动物占优势。与萨拉多河的水文联系程度不同，会改变溶解磷的形态和浮游生物的组成。第三个调节因素是颗粒材料的增加。由于磷与颗粒的关系，这与最高的总磷值有关。相反的情况是第四种调节因子（颗粒物质的减少），产生了清晰的水质状况，其中主要是绿藻，浮游硅藻和轮虫。

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