The concentration of DIN, SRP, and RS varied widely and
showed excess nutrient during autumn and high concentrations
in summer with an apparent excess of SRP. Seasonal and
spatial variation of nutrient concentrations showed that highest
values of DIN were observed in summer(41.50 10.13 mM)
and lowest registered in spring (5.52 5.20 mM). Stations 1,
9 and 10 usually presented peaks of DIN. Nitrate was the most
dominant nitrogen form in winter and summer 2012 (55.89%;
52.97%, respectively) with maximum values observed at stations
1, 9 and 10. Ammonium was the dominant nitrogen form
in spring and winter 2013 (57.40; 83.20%, respectively) with
maximum values registered at stations 1, 7 and 9. Nitrite was
the dominant during autumn (69.22%) with maximum values
recorded at stations 6, 7 and 8.