The Salado River basin, Buenos Aires, Argentina, contains numerous permanent shallow lakes under anthropic pressure due to different land uses/land covers (LULC) in their catchments. Here, we explored the relation of LULC in the surrounding areas and the physical and chemical variables of six shallow lakes of the aforementioned basin with phytoplankton structure and morpho-functional groups (MFGs) along one year and evaluated whether LULC or physical and chemical variables were more relevant in shaping phytoplankton structure. We hypothesized that: (1) shallow lakes with higher proportion of land committed to agriculture exhibit more eutrophic characteristics; (2) the phytoplankton structure and MFGs differ in shallow lakes with different LULC in their surrounding areas; and (3) LULC effects decrease with increase in buffer width. Landsat satellite images were used to extract LULC composition in three buffer zones surrounding each lake: 1, 2.5 and 5 km. In all the lakes studied, LULC had greater influence on phytoplankton MFGs than physical and chemical variables. This influence was highest for the 2.5 km buffer. The phytoplankton structure and some physical and chemical characteristics were also different between the shallow lakes studied. Cyanobacteria were widely detected, probably related to the high proportion of land dedicated to agriculture in the region. Chlorococcales, typical of these eutrophic systems, were also well represented. Our study evidenced the influence of LULC on the shallow lakes studied, particularly on the phytoplankton structure. The response of the planktonic microalgal communities to human activities in catchments evidences their value as sentinels of aquatic ecosystems.

阿根廷布宜诺斯艾利斯的萨拉多河流域包含许多处于人为压力下的永久浅水湖泊，这是由于其流域的土地用途/土地覆盖率（LULC）不同所致。在这里，我们探索了周围地区的LULC与上述盆地六个浅湖中具有浮游植物结构和形态功能基团（MFG）的理化变量之间的关系，并评估了是否是LULC或理化变量与塑造浮游植物结构更相关。我们假设：（1）用于农业的土地所占比例较高的浅水湖泊表现出富营养化特征；（2）浅水湖周边地区的浮游植物结构和MFGs不同。（3）LULC效应随着缓冲区宽度的增加而减小。使用Landsat卫星图像提取围绕每个湖泊的三个缓冲区（1、2.5和5 km）的LULC组成。在所有研究的湖泊中，LULC对浮游植物MFG的影响大于物理和化学变量。对于2.5 km的缓冲区，此影响最大。在所研究的浅水湖泊之间，浮游植物的结构和一些理化特性也有所不同。蓝细菌被广泛发现，可能与该地区用于农业的土地比例高有关。这些富营养化系统中典型的球菌也得到了很好的体现。我们的研究证明了LULC对所研究的浅湖的影响，特别是对浮游植物结构的影响。