Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina.
Instituto Argentino de Oceanografía (IADO-CONICET-UNS), Bahía Blanca, Buenos Aires, Argentina.
Environ Sci Pollut Res Int. 2022 Nov;29(52):79053-79066. doi: 10.1007/s11356-022-21349-w. Epub 2022 Jun 15.
The increasing landscape alterations due to anthropogenic activities is of global concern since it affects aquatic ecosystems, often resulting in compromise of the ecological integrity and the water quality. In this sense, the evaluation, monitoring, and prediction of the aquatic ecosystem quality becomes an important research subject. This study presents the first integrated water quality assessment of the Sauce Grande River Basin, in Argentina, based on the spatial distribution of the phytoplankton community, the physicochemical parameters, and the metal concentrations (Cd, Cu, Cr, Fe, Mn, Ni, Pb, and Zn) found in the particulate fraction. According to the trophic indices and the phytoplankton abundance, composition, and diversity, the water quality showed significant deterioration in the lower basin after the Sauce Grande lake. The trophic state index indicated that water was oligotrophic in over 75% of the sampling sites, increasing downstream, where two sites were characterized as mesotrophic, and one described as hypertrophic. The phytoplankton community was dominated by diatoms in zones with low anthropogenic impact and conductivity, whereas high densities of Euglenophyta, Chlorophyta, and Cyanobacteria were found in the middle-lower basin, associated with higher organic matter and eutrophication. The conductivity, turbidity, and most metal concentrations also increased towards the downstream area, even exceeding recommended levels for the metals Cu, Cr, Mn, and Pb in the middle and lower reaches of the basin (Cu: 3.5 µg L; Cr: 2.4 µg L; Pb: 1.2 µg L; Mn 170 µg L). This study generates a database for the water quality of the Sauce Grande River Basin and sets an example of how the water quality varies along a basin that crosses different topographic environments, land covers, and anthropogenic influences.
由于人为活动导致的景观不断变化引起了全球关注，因为它会影响水生生态系统，常常导致生态完整性和水质受到损害。在这种情况下，对水生生态系统质量进行评估、监测和预测成为一个重要的研究课题。本研究首次对阿根廷 Sauce Grande 河流域进行了综合水质评估，该评估基于浮游植物群落的空间分布、理化参数以及颗粒态金属浓度（Cd、Cu、Cr、Fe、Mn、Ni、Pb 和 Zn）。根据营养指数和浮游植物的丰度、组成和多样性，Sauce Grande 湖以下流域的水质明显恶化。营养状态指数表明，超过 75%的采样点的水处于贫营养状态，并且这种情况在下游更为严重，其中有两个点被归类为中营养状态，一个点被描述为富营养状态。在受人为影响和电导率较低的区域，浮游植物群落主要由硅藻组成，而在中下游地区则发现了较高密度的眼虫、绿藻和蓝藻，这与较高的有机物和富营养化有关。电导率、浊度以及大多数金属浓度也朝着下游区域增加，甚至在流域中下游地区超过了 Cu、Cr、Mn 和 Pb 等金属的推荐水平（Cu：3.5 µg L；Cr：2.4 µg L；Pb：1.2 µg L；Mn：170 µg L）。本研究为 Sauce Grande 河流域的水质生成了一个数据库，并为如何在一条跨越不同地形环境、土地覆盖和人为影响的流域中展示水质变化提供了一个范例。
