Distribution and variability of chlorophyll-a were investigated in this study, in relation to nutrient concentrations (total nitrogen-TN, total phosphorus-TP) and hydro-meteorological conditions. The ratio and sum between TN and TP were also studied. Water samples were collected monthly, during September 2012 -August 2014, from left and right banks of the Danube River. Regarding the seasonal dynamics of Chl-a, the highest concentration was recorded in summer (49.75 g/L) and the lowest one was observed in winter (0.59 g/L). The highest Chl-a annual mean concentration was observed in 2013 (19.00 g/L), closely linked to minimal discharge of the Danube River (2500 mc/s) from the monitored period. In case of Chl-a and total phosphorus, cluster analysis assembled the sampling sections in two different clusters considering the location. Pearson correlation coefficient revealed a weakly relationship between chlorophyll a and total nitrogen and no significant correlation between Chl-a and total phosphorus during summer.
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