IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Seasonality of hydrographic variables in a coastal lagoon: Mar Chiquita, Argentina
Autor/es:
MARCOVECCHIO, JORGE; HUGO FREIJE,; SILVIA DE MARCO,; ANDREA GAVIO,; ORNELA BELTRAME,; RAÚL ASTEASUAIN,
Revista:
Aquatic Conservation: Marine & Freshwater Ecosystems
Editorial:
J.Wiley & Sons
Referencias:
Lugar: Cambridge, UK.; Año: 2006 vol. 16 p. 335 - 347
ISSN:
1052-7613
Resumen:
ABSTRACT
1. The concentration and distribution of several hydrographical variables from Mar Chiquita
coastal lagoon, Argentina, were measured monthly over a year in order to quantify their seasonal
variations. Temperature, salinity, inorganic nutrient concentrations (nitrate, nitrite, phosphate,
silicate) in the water column, and photosynthetic pigments (chlorophyll a and phaeopigments) in
suspended particulate matter (SPM), were measured using internationally standardized analytical
methods.
2. Agricultural use of land surrounding the coastal lagoon has been shown to be the main nutrient
source, owing to the use of fertilizers for farming and the consequent leaching of the soils by
freshwater runoff.
3. Two different hydrographical areas were identified within the coastal lagoon, one showing
marine influence and the other dominated by inland influence (due to catchment and freshwater
inputs), both with different characteristics and ecological behaviour.
4. The frequent occurrence of phytoplankton blooms has also been identified within the coastal
lagoon. There was significant biological production (in terms of chlorophyll a) within the lagoon
throughout the year. The lagoon appears to function as a transitional system, opportunistically
benefiting from extra nutrient inputs which, together with other environmental conditions, results in
a continuous food supply, useful to both marine and estuarine organisms. Consequently the system
is important for numerous fish and shellfish species as a nursery area.
Copyright # 2005 John Wiley & Sons, Ltd.a and phaeopigments) in
suspended particulate matter (SPM), were measured using internationally standardized analytical
methods.
2. Agricultural use of land surrounding the coastal lagoon has been shown to be the main nutrient
source, owing to the use of fertilizers for farming and the consequent leaching of the soils by
freshwater runoff.
3. Two different hydrographical areas were identified within the coastal lagoon, one showing
marine influence and the other dominated by inland influence (due to catchment and freshwater
inputs), both with different characteristics and ecological behaviour.
4. The frequent occurrence of phytoplankton blooms has also been identified within the coastal
lagoon. There was significant biological production (in terms of chlorophyll a) within the lagoon
throughout the year. The lagoon appears to function as a transitional system, opportunistically
benefiting from extra nutrient inputs which, together with other environmental conditions, results in
a continuous food supply, useful to both marine and estuarine organisms. Consequently the system
is important for numerous fish and shellfish species as a nursery area.
Copyright # 2005 John Wiley & Sons, Ltd.a) within the lagoon
throughout the year. The lagoon appears to function as a transitional system, opportunistically
benefiting from extra nutrient inputs which, together with other environmental conditions, results in
a continuous food supply, useful to both marine and estuarine organisms. Consequently the system
is important for numerous fish and shellfish species as a nursery area.
Copyright # 2005 John Wiley & Sons, Ltd.# 2005 John Wiley & Sons, Ltd.