Biogeochemistry of Jurujuba sound concerning phosphorus dynamics, Rio de Janeiro, Brazil

Guanabara Bay stands out as one of the most polluted coastal areas of Brazil, highly eutrophicated, surrounded by industries and a non planned urbanized area. The concentrations of nutrients in this area vary greatly, generally presenting higher levels in the inner portions. The present study propos...

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Veröffentlicht in:Journal of coastal research 2013-01, Vol.1 (65), p.1-1
Hauptverfasser: Aguiar, Valquiria Maria de Carvalho, Abuchacra, Paula Ferreira Falheiro, Neto, Jose Antonio Baptista
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container_end_page 1
container_issue 65
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container_title Journal of coastal research
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creator Aguiar, Valquiria Maria de Carvalho
Abuchacra, Paula Ferreira Falheiro
Neto, Jose Antonio Baptista
description Guanabara Bay stands out as one of the most polluted coastal areas of Brazil, highly eutrophicated, surrounded by industries and a non planned urbanized area. The concentrations of nutrients in this area vary greatly, generally presenting higher levels in the inner portions. The present study proposes to evaluate the trophic levels of this area not only through the water column, but also through the composition of sedimentary organic matter. Results revealed unquestionable effects of eutrophication as hypoxia in bottom waters, and phytoplankton blooms in the surface, with chlorophyll-a values up to 40.58 mu g.L super( -1), and oxygen contents as low as 0.86 mg.L super( -1). Surprisingly, concentrations of dissolved nutrients were mostly characteristic of oligotrophic environments. Dissolved inorganic phosphorus varied between 0.09 and 3.98 mu M. Ammonium varied between 0.78 and 3.84 mu M. In the sediments, inorganic phosphorus varied between 1.61 and 15.80 mu mol.g super( -1) and organic phosphorus presented maximum and minimum values of 10.06 and 1.52 mu mol.g super( -1), respectively.
doi_str_mv 10.2112/SI65-001
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subjects Ammonium
Biogeochemistry
Brazil
Coastal
Coastal zone
Coasts
Concentration (composition)
Dissolution
Eutrophication
Hypoxia
Nutrients
Organic matter
Phosphorus
Phytoplankton
Trophic levels
Water column
title Biogeochemistry of Jurujuba sound concerning phosphorus dynamics, Rio de Janeiro, Brazil
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