IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Nutrients dynamics in an unvegetated tidal flat of a South American Estuary: Bahía Blanca, Argentina.
Autor/es:
FERNÁNDEZ ELEONORA MARISEL; NEGRIN VANESA; MARCOVECCHIO JORGE EDUARDO; SPETTER CARLA VANESA; FREIJE RUBÉN HUGO
Lugar:
Campos de Goytacazes
Reunión:
Conferencia; International conference on Ecohydrology; 2017
Institución organizadora:
Universidade Estadual Norte Fluminense
Resumen:
The Bahía Blanca Estuary (BBE) is considered highly eutrophic. High nutrient loading in coastal ecosystems has caused serious eutrophication problems. In order to assess the macronutrients dynamic in surface water (SW) and porewater (PW) in an unvegetated mud flat of the inner zone of BBE and determine the interchange of macronutrients between sediments and water; as well as to understand the role of hydrodynamics on the seasonal pattern of macronutrients, macronutrients variability was studied during May 2003 to May 2004. Nitrite, nitrate, ammonium, phosphate, silicates, chlorophyll a, particulate organic matter, and physicochemical parameters were measured in SW at Cuatreros Port. In addition, the macronutrient concentration was measured in PW-I (0 - 3 cm depth) and PW-II (3 ? 6 cm depth). Three maximum peaks of Chlorophyll a were determined in SW, two in winter 38,93 and 23,79 µg L-1 , and one in summer (22,47 µg L-1). Nitrite, nitrate and phosphates mean values in SW (1.30 ± 1.06 µM, 8.87 ± 6.46 µM and 1.99 ± 0.90 µM, respectively) were higher than in PW-I (0.26 ± 0.19 µM, 0.99 ± 1.10 µM and 1.57 ± 0.89 µM, respectively) and PW-II (0.39 ± 0.22 µM, 1.08 ± 0.96 µM and 1.98 ± 1.77 µM, respectively), while ammonium and silicates presented higher levels in PW-II (27.90 ± 14.25 µM and 314.13 ± 168.54 µM, respectively) than in PW-I (22.15 ± 13.50 µM and 207.88 ± 90.71 µM, respectively) and SW (14.37 ± 8.99 µM and 144.95 ± 47.03 µM, respectively) . Different remineralization processes seem to be taking place in the water?sediment interface, and they will be the sources of some macronutrients available within the water column.