INVESTIGADORES
MARCOVECCHIO Jorge Eduardo
artículos
Título:
Cadmium concentrations in the Bahía Blanca estuary (Argentina). Potential effects of dissolved cadmium on the diatom Thalassiosira curviseriata
Autor/es:
SANTIAGO ANDRADE; ADAN E. PUCCI; JORGE MARCOVECCHIO
Revista:
OCEANOLOGIA
Editorial:
POLISH ACAD SCIENCES INST OCEANOLOGY
Referencias:
Lugar: Varsovia; Año: 2000 vol. 43 p. 505 - 520
ISSN:
0078-3234
Resumen:
Concentrations of dissolved and particulate cadmium were measured in the water
of the Bah´ıa Blanca Estuary, one of the most highly industrialised regions
in Argentina. Simultaneously, Cd contents were also determined in samples of
phytoplankton. Thus, the estuary was characterised from the viewpoint of Cd
occurrence. Additionally, a microscale environment was selected within the estuary
in order to carry out an ecotoxicological study. Thus, environmental parameters
(i.e. temperature, salinity, nutrients, chlorophyll a) were measured weekly at
Puerto Cuatreros (in the inner estuary) during winter, when the phytoplankton
bloom occurs; during the other seasons sampling was done twice a week. In
addition, cells of the diatom Thalassiosira curviseriata the dominant species in the phytoplankton bloom were isolated and cultivated in the laboratory.
The monoclonal cultures obtained were exposed to increasing concentrations of
Cd under controlled environmental conditions and the growth rate inhibition was
measured. As a preliminary conclusion it was found that Cd levels in the Bah´ıa
Blanca Estuary are significantly lower than the EC50 value for T. curviseriata.
