Artículos de revistas
Benthic fluxes and nitrate reduction activity in a marine park (Northern San Jorge Gulf) from Patagonia Argentina
Fecha
2016-05Registro en:
Torres, Américo Iadran; Faleschini, Mauricio; Esteves, Jose Luis; Benthic fluxes and nitrate reduction activity in a marine park (Northern San Jorge Gulf) from Patagonia Argentina; Springer Verlag; Environmental Earth Sciences; 75; 9; 5-2016; 1-9
1866-6280
1866-6299
CONICET Digital
CONICET
Autor
Torres, Américo Iadran
Faleschini, Mauricio
Esteves, Jose Luis
Resumen
The Northern San Jorge Gulf (NSJG) was declared Coastal Marine Park in 2008 with the goal of preserving its biodiversity. In situ benthic fluxes experiments were performed using an opaque chamber in Sara Creek (SC) and Malaspina Creek (MC). Moreover, ex situ nitrate reduction activity was assessed using a continuous flow-through system. Benthic fluxes in MC, showed a consumption of oxygen (794 ± 196 mg m−2 h−1) and nitrate (103 ± 68 µmol m−2 h−1) by sediment and release of ammonium (175 ± 60 µmol m−2 h−1), phosphate (66 ± 10 µmol m−2 h−1) and silicate (116 ± 66 µmol m−2 h−1) towards the water column. In SC, the same pattern was observed and the fluxes values were 375 ± 132, 128 ± 1, 76 ± 12, 39 ± 24 and 133 ± 81, respectively. Only, ammonium and oxygen fluxes showed significant differences between sites, due to the highest organic matter content and the particular hydrodynamic conditions in MC. These are the first benthic flux measurements made within the protected area. Nitrate uptake rate, based on Michaelis–Menten kinetic, was Km: 155.3 µM and Vmax: 0.053 µM g−1 h−1 in SC and Km: 131.2 µM and Vmax: 0.039 µM g−1 h−1 in MC. Considering the nitrate dynamic we concluded that the sediments both SC and MC act as a sink of nitrate. This ion could be principally used as a terminal electron acceptor during the oxidation process of organic compounds in sediments of NSJG.