TY - JOUR
T1 - Nutrient regeneration susceptibility under contrasting sedimentary conditions from the Rio de Janeiro coast, Brazil
AU - Matos, Christiene R.L.
AU - Mendoza, Ursula
AU - Diaz, Rut
AU - Moreira, Manuel
AU - Belem, Andre L.
AU - Metzger, Edouard
AU - Albuquerque, Ana Luiza S.
AU - Machado, Wilson
N1 - Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/7/15
Y1 - 2016/7/15
N2 - 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.
AB - 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.
KW - Diagenesis
KW - Eutrophication
KW - Nutrients
KW - Pore water
KW - Remobilization modeling
UR - http://www.scopus.com/inward/record.url?scp=85006141548&partnerID=8YFLogxK
U2 - 10.1016/j.marpolbul.2016.04.046
DO - 10.1016/j.marpolbul.2016.04.046
M3 - Artículo
C2 - 27156036
AN - SCOPUS:85006141548
SN - 0025-326X
VL - 108
SP - 297
EP - 302
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
IS - 1-2
ER -