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Article Dans Une Revue Marine Pollution Bulletin Année : 2016

Nutrient regeneration susceptibility under contrasting sedimentary conditions from the Rio de Janeiro coast, Brazil

Christiene Matos
  • Fonction : Auteur
Ursula Mendoza
  • Fonction : Auteur
Rut Diaz
  • Fonction : Auteur
Manuel Moreira
Andre Belem
  • Fonction : Auteur
Édouard Metzger
Ana Albuquerque
  • Fonction : Auteur
Wilson Machado
  • Fonction : Auteur

Résumé

Dissolved silicate (DSi), NH4+, NO3− and PO43 − susceptibility to be exchanged between sediment pore waters and overlying waters was evaluated in Jurujuba Sound (JS station) and Coroa Grande Sound (CGS station), southeastern Brazil. Sedimentary elemental (C, N and P) and isotopic (δ13C and δ15N) compositions evidenced stronger anthropogenic fertilization in JS station. Net NO3− influxes from overlying waters occurred, which was two orders of magnitude higher under the more fertilized condition. This condition resulted in 6–13-times higher net effluxes of NH4+, DSi and PO43 − to overlying waters. Vertical alternation between production and consumption processes in pore waters contributed for a more limited regeneration in CGS station. This was associated with diagenetic responses to sedimentary grain size variability in deeper layers and biological disturbance in upper layers. Nearly continuous production of NH4+, DSi and PO43 − in pore waters implied in intensified susceptibility to remobilization under the eutrophic condition of JS station.

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Dates et versions

hal-01453029 , version 1 (02-02-2017)

Identifiants

Citer

Christiene Matos, Ursula Mendoza, Rut Diaz, Manuel Moreira, Andre Belem, et al.. Nutrient regeneration susceptibility under contrasting sedimentary conditions from the Rio de Janeiro coast, Brazil. Marine Pollution Bulletin, 2016, 108 (1-2), pp.297-302. ⟨10.1016/j.marpolbul.2016.04.046⟩. ⟨hal-01453029⟩

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