## 3 Results
### Hydrochemistry of the Lower Dniester
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Scanson**} & \multicolumn{2}{c}{**DO**} & \multicolumn{2}{c}{**TOC**} & \multicolumn{2}{c}{**BODs**} & \multirow{2}{*}{**TSS**} & \multicolumn{2}{c}{**NHs\({}^{\star}\)**} & \multicolumn{2}{c}{**NOs\({}^{\star}\)**} & \multicolumn{2}{c}{**NOs\({}^{\star}\)**} & \multicolumn{2}{c}{**DN**} & \multicolumn{2}{c}{**TDN**} & \multicolumn{2}{c}{**DIN**} & \multicolumn{2}{c}{**DIN**} & \multicolumn{2}{c}{**DIN**} & \multicolumn{2}{c}{**DIN**} & \multicolumn{2}{c}{**DIN**} & \multicolumn{2}{c}{**DIN**} \\ \cline{2-13} \cline{6-13}  & \multicolumn{2}{c}{**\%**} & \multicolumn{2}{c}{**mg L-1**} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} \\ \hline  & & & & & & & & & & & & & & & \\ \multirow{-2}{*}{Winter} & 98.0 \(\pm\) 12.0 & 7.3 \(\pm\) 2.0 & 3.7 \(\pm\) 0.45 & 8.2 \(\pm\) 5.6 & 0.020 & 0.010 & 1.7 \(\pm\) 0.42 & 1.8 \(\pm\) 0.42 & 1.09 \(\pm\) 0.18 & 2.9 \(\pm\) 0.48 & 0.004 & 0.004 & 0.007 & 2.5 \(\pm\) 0.23 \\  & 68.9 \(\pm\) 12.7 & 42. \(\pm\) 11.8 & 2.9 \(\pm\) 4.44 & 1.9 \(\pm\) 25.1 & 0.080 & 0.010 & 0.99\(\pm\) 27.4 & 1.08\(\pm\) 0.28 & 0.59\(\pm\) 13.6 & 1.88\(\pm\) 39.9 & 0.075 & 0.015 & 0.088 & -2.9 \(\pm\) 3.29 \\  & 68.9 \(\pm\) 12.7 & 42. \(\pm\) 11.8 & 2.9 \(\pm\) 4.44 & 1.9 \(\pm\) 25.1 & 0.144 & 0.050 & 0.04 \(\pm\) 0.04 & 0.050 & 0.04 \(\pm\) 0.04 & 0.02 & 0.121 & \\  & 0.064 \(\pm\) & 0.022 & \(\pm\) 11.0 & 0.080 & 0.010 & 1.6 \(\pm\) 0.24 & 1.8 \(\pm\) 0.28 & 0.78 \(\pm\) 0.19 & 2.6 \(\pm\) 0.47 & 0.006 & 0.001 & 0.005 & 2.2 \(\pm\) 0.30 \\ Spring & 8.1 \(\pm\) 6.9 & 5.0 \(\pm\) 1.5 & 0.97 \(\pm\) 0.25 & 30.6 \(\pm\) 7.2 & 0.030 & 0.010 & 1.6 \(\pm\) 0.24 & 1.8 \(\pm\) 0.28 & 0.78 \(\pm\) 0.19 & 2.6 \(\pm\) 0.47 & 0.006 & 0.001 & 0.005 & 2.2 \(\pm\) 0.30 \\  & 60.6 \(\pm\) 90.2 & 3.4 \(\pm\) 9.6 & 0.55 \(\pm\) 16.7 & 13.3 \(\pm\) 6.1 & 0.014 & 0.016 & 1.2 \(\pm\) 27.7 & 1.50 \(\pm\) 25.2 & 0.51–12.3 & 2.10-37.5 & 0.055 & 0.016 & 0.075 & 1.7 -1.3 \(\pm\) 3.13 \\  & 0.31 \(\pm\) 0.06 & & 0.080 \(\pm\) 0.08 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 \\ Summer & 63.5 \(\pm\) 5.5 & 64. \(\pm\) 1.5 & 1.23 \(\pm\) 0.23 & 24.1 \(\pm\) 4.3 & 0.099 & 0.004 & 1.17 \(\pm\) 0.14 & 1.30 \(\pm\) 0.14 & 1.10 \(\pm\) 0.24 & 2.50 \(\pm\) 0.11 & 0.014 & 0.015 & 0.009 & 3.4 \(\pm\) 0.34 \\  & 47.3 \(\pm\) 7.19 & 43. \(\pm\) 10.7 & 0.63 \(\pm\) 16.7 & 17.4 \(\pm\) 36.6 & 0.016 & 0.031 & 0.94 \(\pm\) 15.8 & 1.08–16.2 & 0.55–14.4 & 2.17–28.4 & 0.023 & -0.068 & 0.082 & -2.8 \(\pm\) 4.91 \\  & 0.170 & 0.047 & & 0.087 & 0.063 & 0.123 & 0.025 & 0.034 & & 0.087 & 0.083 & 0.123 & \\  & 0.025 \(\pm\) & 0.034 & & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 & 0.080 \\ \hline \multicolumn{13}{c}{Abbreviations: DO-Desolved Oxygen, TOC-Total Organic Carbon, BODs-Global Oxygen Demand, TSS-Total Suspended Solids, TDN-Total Dosolved Nitrogen, TON-Total Organic Nitrogen as a difference between TON and DIN, DIN-DIN-Dosolved Inorganic Phosphorus, TDT-Total Dosolved Phosphorus, DOP-Dosolved Organic Phosphorus,} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Seasonal variations of nutrients of the Lower Düister in 2018-2020 (above the line, average values and standard error; below the line, range of variation). Winter is the period for maximum concentrations of nitrogen species (ammonium, nitrates, total nitrogen). Due to the decomposition of plankton and detritus, an increase in the concentration of dissolved nutrients in winter is a common occurrence, when the content of suspended matter is released into a dissolved form. The concentrations of ammonium, nitrates, and total nitrogen decrease until autumn, and in the winter, a rapid rise in their concentrations is again observed.