INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Unidad Ejecutora - UE
From water to edible fish. Transfer of metals and metalloids in the SanRoque Reservoir (Córdoba, Argentina). Implications associated withfish consumption.
MONFERRÁN. M.V; ARIEL ANBAR; M. A. BISTONI; D. A. WUNDERLIN; GARNERO, P; GWYNETH W. GORDON
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2016 vol. 63 p. 48 - 48
tThe concentration of Mn, Fe, Zn, Cu, Cd, Cr, Ni, Ag, Mo, Nd, Al, Ce, As, Sr, Pb, Pt and Hg was analysedin water, sediments, and aquatic organisms from the San Roque Reservoir (Córdoba-Argentina), sam-pled during the wet and dry season, to evaluate their transfer through the food web. Stable nitrogen(15N) isotopes were used to investigate trophic interactions. According to this, samples were dividedinto three trophic groups: plankton, shrimp (Palaemonetes argentinus) and fish (Silverside, Odontesthesbonariensis). Liver and gills are the main heavy metal storage tissues in fish. Hg and As concentrationsin the muscle of O. bonariensis exceed the Oral Reference doses for metals established by USEPA (2009).Trophic magnification factors (TMFs) for each element were determined from the slope of the regressionbetween trace element concentrations and 15N. Calculated TMFs showed fundamental differences inthe trophodynamics of the studied elements during the wet and dry season in the San Roque Reservoir.Concentrations of Ni, Cd, Cr, Al, Mn, Fe, Mo, Ce, Nd, Pt and Pb during both seasons, and Sr during thedry season, showed statistically significant decreases (TMF < 1) with increasing trophic levels. Thus theseelements were trophically diluted in the San Roque food chain. Conversely, Cu, Ag and As (dry season)showed no significant relationships with trophic levels. Among the elements studied, Hg in the wet sea-son, and Zn in the dry season were the only ones showing a statistically significant increase (TMF > 1) inconcentration with trophic level. Current results trigger the need for further studies to establish differ-ential behaviour with different species within the aquatic web, particularly when evaluating the transferof toxic elements to edible organisms, which could pose health risks to humans.