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