Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams

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Abstract

The aim of this study was to investigate the post-dam conditions of the loads and yields of dissolved inorganic nitrogen (DIN), orthophosphate (DIP, silicate (DSi) and total phosphorous (TP) in the Lower São Francisco riverestuary (NE-Brazil) after the river was regulated to a constant flow by the dams. Loads and yields of monthly measurements performed from November 2000 to March 2002 at a gauging station downstream of the dams (80 km from the coast) showed 4.1 × 10 3 t/yr and 0.006 t/km 2/yr of DIN, 0.2 × 10 3 t/yr and 0.002 t/km2/yr of DIP, and 448 × 10 3 t/yr and 0.71 t/km 2/yr of DSi, respectively. Over the last 15 years, DIN loads reduced by 94 % and DSi by 31%. The river turned into an oligotrophic system with primary production limited by nitrogen and nutrient yields being among the lowest of Brazilian coastal rivers.

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Medeiros, P. R. P., Knoppers, B. A., Cavalcante, G. H., & de Souza, W. F. L. (2011). Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams. Brazilian Archives of Biology and Technology, 54(4), 387–397. https://doi.org/10.1590/S1516-89132011000200022

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