Data/hora: 01/06/2024 19:14:47

Provedor de dados: | 52
País: | Brazil
Título: | Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams
Autores: | Medeiros,Paulo Ricardo Petter; Knoppers,Bastiaan Adriaan; Cavalcante,Geórgenes Hilário; Souza,Weber Friederichs Landim de.
Data: | 2011-04-01
Ano: | 2011
Palavras-chave: | Nutrients; Fluvial loads; Dam impacts; Estuary; São Francisco River (NE-Brazil).
Resumo: | 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 river estuary (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 x 10³ t/yr and 0.006 t/km² /yr of DIN, 0.2 x 10³ t/yr and 0.002 t/km² /yr of DIP, and 448 x 10³ t/yr and 0.71 t/km² /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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000200022
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132011000200022
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.54 n.2 2011
Fonte: | info:eu-repo/semantics/openAccess