INVESTIGADORES
FERNANDEZ SEVERINI Melisa Daiana
congresos y reuniones científicas
Título:
HEAVY METALS LEVELS IN THE SUSPENDED PARTICULATE MATTER SPM AND PLANKTON OF THE "EL RINCON SYSTEM", SOUTHWESTERN ATLANTIC, (ARGENTINE SEA)
Autor/es:
VILLAGRAN DIANA MARIEL; FERNÁNDEZ SEVERINI MELISA; BERASATEGUI ANABELA ANAHÍ; BUZZI NATALIA SOL; CHATELAIN SARTOR GABRIELA; JORGE EDUARDO MARCOVECCHIO
Lugar:
San Luis
Reunión:
Congreso; VII Congreso Argentino de la Sociedad de Toxicología y Química Ambiental; 2018
Institución organizadora:
SETAC y SETAC Argentina
Resumen:
?El Rincón? system is a future protected area in the North Patagonian coast (Argentina, Southwestern Atlantic) that is connected with the Bahía Blanca estuary and the Anegada Bay in the west, and it receives contributions of fresh water from the Colorado and Negro rivers. It is a very productive area because of the high development of primary and secondary producers (phytoplankton and mesozooplankton), where there is a significant development of fishes of ecological and economic importance.Metals play a fundamental role in the functioning of the ocean. Some of them are considered essential for marine organisms, while others can be toxic. In fact, at high concentrations all metals are toxic for the biota. Even more, they are considered stable, persistent, non-biodegradable, and toxic contaminants in aquatic environments. In this sense, the SPM has been recognized both as carrier and as possible source of contaminants in aquatic systems affecting their transport, fate, biogeochemistry, bioavailability and toxicity. On the other hand, plankton organisms are on the basis of the trophic webs and they have a great capacity to retain and transfer these potentially toxic elements not only at the spatial level, but also through the trophic webs.This study evaluated the spatial distribution of the Cd, Cu, Pb, Zn, Ni, Mn, Cr and Fe concentrations in the microplankton, mesozooplankton and SPM. Sampling was carried out during El Rincón IADO-PNA 0516 oceanographic survey during the austral autumn 2016 (April 2016), at 6 sites near to the Bahía Blanca Estuary and to the Colorado and Negro rivers. Surface water samples for SPM were collected, from a nominal depth of 5m, with 5L Niskin bottles. Microplankton and mesozooplankton samples were collected by means of oblique tows, using plankton nets of 20 μm and 200 μm mesh respectively. Determinations of heavy metals were performed with an ICP-OES Optima 2100 DV Perkin Elmer.The highest concentrations of all metals in all fractions were found in the sites near the Colorado and Negro rivers, indicating that ?El Rincon? system are influenced by external contributors and the main sources are the rivers. Since all the analyzed metals were detected in micro and mesozooplankton at all sampled sites, they were bioavailable to the organisms as well as bioaccumulated.