INVESTIGADORES
BOTTE Sandra Elizabeth
artículos
Título:
Tidal time-scale variation of inorganic nutrients and organic matter in Bahia Blanca mesotidal estuary, Argentina
Autor/es:
MARCOVECCHIO, J.E.; SPETTER, C.; BOTTÉ, S.E.; DELUCCHI, F.; ARIAS, A.; FERNANDEZ SEVERINI, M.; NEGRIN, V.; POPOVICH, C.A.; FREIJE, R.H.
Revista:
CHEMISTRY AND ECOLOGY
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: London, UK; Año: 2009 vol. 25 p. 453 - 465
ISSN:
0275-7540
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 the processes and to establish the extent in which they
modify terrestrial compound fluxes, such as nutrients, that end up in the oceans. At present, one of the
topics that arouses the highest interest within environmental coastal studies is the direction and magnitude of
inorganic nutrients and the exchange fluxes of organic matter between the water column and the associated
tidal plains during the daily tidal cycle. These processes, together with the local hydrographic conditions,
define the key role of this type of environment: its function as a nutrient and organic matter reservoir and/or
as a source. A research programme directed to understand this mechanism within mesotidal estuaries was
developed in the Bahía Blanca estuary, on the coast of BuenosAires (Argentina). On a tidal time-scale basis,
levels of DIN (nitrate + nitrite + ammonium), DIP, DISi, and organic matter were measured in the estuarine
water column and tidal plain porewater, for two years. Results showed no significant variations during the
tidal cycle, even though the temporal variation of these compounds was clearly identified. In addition,
the biological production of the estuary was considered and taken into account, so as to understand the
organic matter cycle within the system. Particular conditions of the environment (sediment characteristics,
porewater chemical environment, hydrodynamics, anthropogenic sources, etc.) were also considered to
help fully understand the results.