## 3 Results
### Environmental Variables, Land Use, and Hydrological Conditions
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Variables** & \multicolumn{3}{c}{**Sauce Grande**} & \multicolumn{3}{c}{**La Salada**} \\ \hline  & **Mean** & **SD** & **Min** & **Max** & **Mean** & **SD** & **Min** & **Max** \\ \hline Temp (\({}^{\circ}\)C) & 17.1 & 6.5 & 12.1 & 24.5 & 16.0 & 5.7 & 7.5 & 25.2 \\ Cond (mS cm\({}^{-1}\)) & 2.5 & 0.2 & 2.3 & 2.8 & 49.9 & 4.7 & 41.6 & 58.0 \\ Level (m) & 1.7 & 0.2 & 1.3 & 2.1 & 2.3 & 0.3 & 2.1 & 3.20 \\ Caudal (m\({}^{3}\) s\({}^{-1}\)) & 2.8 & 1.1 & 1.7 & 7.0 & 0.28 & 0.16 & 0.03 & 0.64 \\ Wind (m s\({}^{-1}\)) & 3.3 & 2.6 & 0.0 & 13.2 & 6.6 & 4.3 & 0.0 & 27.6 \\ Free (mm) & 33.8 & 12.0 & 18.9 & 49.2 & 52.2 & 29.5 & 8.0 & 92.5 \\ Vol (km\({}^{3}\)) & 0.013 & 0.009 & 0.003 & 0.030 & 0.012 & 0.008 & 0.003 & 0.028 \\ pH & 10.0 & 0.4 & 9.7 & 10.4 & 8.1 & 0.4 & 7.1 & 8.6 \\ DO (mg L\({}^{-1}\)) & 5.9 & 1.3 & 4.9 & 7.4 & 9.8 & 2.0 & 6.5 & 12.2 \\ ChI \(a\) (ug L\({}^{-1}\)) & 59.6 & 36.6 & 20.9 & 93.7 & 9.0 & 5.0 & 3.1 & 15.6 \\ SPM (mg L\({}^{-1}\)) & 64.8 & 14.6 & 50.8 & 80.0 & 40.9 & 25.2 & 6.4 & 100.4 \\ POM (mg L\({}^{-1}\)) & 33.4 & 16.9 & 20.0 & 52.5 & 12.3 & 21.5 & 2.4 & 76.9 \\ Secch disk (m) & 0.28 & 0.7 & 0.20 & 0.33 & 1.6 & 0.7 & 0.0 & 2.7 \\ TP (mg L\({}^{-1}\)) & 0.1 & 0.09 & 0.04 & 0.21 & 0.05 & 0.02 & 0.03 & 0.09 \\ TNorg (mg L\({}^{-1}\)) & 12.8 & 4.7 & 9.4 & 18.2 & 3.5 & 0.2 & 3.3 & 3.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Mean, standard deviation (SD), minimum (Min), and maximum (Max) values of the environmental parameters measured in La Salada and Sauce Grande Lakes during the study period. Temp: water temperature; Cond: conductivity; Level: water level; Prec: precipitation; Vol: lake volume; DO: dissolved oxygen; Chl _a_: chlorophyll a; SPM: suspended particulate matter; POM: particulate organic matter; TP: total phosphorous; TNorg: total organic nitrogen. Figure 3: Lake volume and water input variations in the (**a**) La Salada and (**b**) Sauce Grande lakes during the study period. Input: water input. The SG Lake presented eutrophic conditions during the entire study period. In contrast with LS, it presented higher Chl \(a\), nutrient, MPS, and MOP values (Table 2). Transparency was low with a Secchi disk mean value of 0.28 m and a mean euphotic zone value of 0.7 \(\pm\) 0.2 m. Thus, it was classified as an alkaline lake, rich in DO. With respect to the nutrient concentrations, TP was twice that in LS, and TNorg was three times the concentration value. With respect to the land use in the area of influence of the lake (780 km\({}^{2}\)), 62% of the area is devoted to agricultural systems, 22.9% to dunes, 9.8% to marshlands, 1.7% to forests, and only 0.5% to human settlements. SPI values characterized the study period as normal conditions. In contrast with LS, volume fluctuations during the study period were not clearly associated with the water inputs (Figure 3b). The mean lake volume was 0.013 \(\pm\) 0.0095 km\({}^{3}\), with maximum values during the spring of 2017. During the study period, the total amount of water that entered the lake was 0.095 km\({}^{3}\) (Figure 3b), reaching a maximum of 0.00061 km\({}^{3}\) day\({}^{-1}\) during October 2016. Conductivity was low, classifying SG as a hyposaline lake (Table 2). Minimum values were recorded in March 2017 and maximum in April 2017. Precipitation values presented minimum values in July 2017 and maximum values in February 2017 (Table 2).