IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
HEAVY METALS IN ACARTIA TONSA AND EURYTEMORA AMERICANA
Autor/es:
FERNÁNDEZ SEVERINI, MD; HOFFMEYER, M.S., ,; MARCOVECCHIO, J.E.; MENÉNDEZ, MC
Revista:
BIOCELL
Editorial:
Instituto de Histología y Embriología "Dr. Mario H. Burgos"
Referencias:
Lugar: Mendoza, Argentina; Año: 2007 p. 348 - 348
ISSN:
0327-9545
Resumen:
The Bahía Blanca Estuary is a coastal environment that receives important discharges
from surrounded industries and the Bahía Blanca city. Heavy metals are common
pollutants in this type of effluents and zooplankton play an important role in the
biogeochemical cycling of these metals in marine systems. The goal of this study was
to determine the presence of cadmium, lead and copper in A. tonsa and E. americana
and suspended particulate matter (SPM). Sampling was carried out in 2005 in five
stations on the months with the highest abundance of A. tonsa (April) and E.
americana (September). Plankton was sampled with a Nansen net (0.2 mm mesh
size), SPM with a Van Dorn bottle and metals were determined by atomic absorption
spectrophotometry. Cd concentrations in A. tonsa were below the detection limit (<0.2
µg/g), Cu between 31.05 and 9.99 µg/g and Pb between 38.33 and 11.38 µg/g. Cd in
E. americana was below the detection limit and 10.81 µg/g, Cu between 1.27 and
153.65 and Pb below the detection limit (<0.5 µg/g) and 842.68 µg/g. In SPM
sampled in April, Cd was below the detection limit and 16.20 µg/g, Cu between 4.03
and 21.47 µg/g and Pb between 12.04 and 38.90 µg/g. In September, Cd were below
the detection limit, Cu below the detection limit and 3.86 µg/g and Pb below the
detection limit and 3.37 µg/g. E. americana always presented higher metal
concentrations than A. tonsa, however in SPM the highest values were found in April,
when A. tonsa was present. Possible explanations for these seasonal differences may
be related to their life cycle and ecology, incorporation strategies or bioavailability
changes of the metals. Finally, though several factors determine metals content in
zooplankton, enhanced levels found would imply anthropogenic contamination.