CADIC   02618
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Inorganic nutrients and organic matter tidal time-scale variation in estuaries from Argentina
Autor/es:
MARCOVECCHIO JORGE; SPETTER CARLA; DE MARCO SILVIA; BELTRAME ORNELLA; AMIN OSCAR; COMOGLIO, LAURA; FREIJE R.H; BOTTÉ SANDRA; DELUCCHI FEDERICO; ARIAS A
Lugar:
Bahia Blanca
Reunión:
Simposio; Science and Management of Estuaries and Coasts: A tile of two hemispheres. ECSA44; 2008
Institución organizadora:
ECSA
Resumen:
Land-derived materials are regulated by coastal and shelf environmental conditions
before being transported to the open sea. It is of great concern to understand these
processes and to establish the extent in which they modify terrestrial compounds fluxes
to the oceans, such as nutrients. At present, one of the topics of highest interest within
environmental coastal studies is the direction and magnitude of inorganic nutrients and
the organic matter exchange fluxes between the water column and the associated tidal
plains during the dairy tidal cycle. These processes, together with the local hydrographic
conditions, define the key role of this type of environments: its functioning as nutrient
and organic matter reservoir and/or as a source. A research program including three
estuaries with different tidal amplitude levels were developed in Argentine coastal
system: Mar Chiquita Coastal Lagoon (microtidal) and Bahía Blanca Estuary
(mesotidal) both in Buenos Aires Province littoral, and Rio Chico Estuary (macrotidal)
in Tierra del Fuego. Levels of DIN (nitrate + nitrite + ammonium), DIP, DISi, and
organic matter were measured in estuarine water column and tidal plain porewater in a
tidal time-scale along a year. Results showed no significant variations during the tidal
cycle neither in the macrotidal estuary nor in the mesotidal one. In the opposite, the
studied microtidal estuary presented strong variations on nutrients and organic matter
concentrations along the tidal cycle. Particular conditions within the systems (sediment
characteristics, porewater chemical environment, hydrodynamics, anthropogenic
sources, etc) were considered to understand these results.