ICYTAC   23898
INSTITUTO DE CIENCIA Y TECNOLOGIA DE ALIMENTOS CORDOBA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ctalamochita River watershed biomonitoring using two South American native species: First approach.
Autor/es:
LIDWINA BERTRAND; MAGDALENA MONFERRAN; C. MOUNEYRAC; MARÝA VALERIA AME
Lugar:
Buenos Aires
Reunión:
Congreso; SETAC Latin America 11th Biennial meeting; 2015
Institución organizadora:
SETAC
Resumen:
The worldwide degradation of aquatic environments by different pollutants has increased in the last century. Argentina is not an exception to this problem and quality assessment of water resources has become a priority. The aim of this work was to carry out an active biomonitoring of Ctalamochita River (Córdoba, Argentina) using two native species: Potamogeton pusillus and Palaemonetes argentinus. Seven sites have been selected according to land use in different watershed areas?: A- Upstream: Pre and Post Santa Rosa de Ctalamochita city sites (S1 and S2), with low density of urban use; B-Middle Basin: Balneario Almafuerte (S3), with agricultural and urban use; Post Rio Tercero city (S4), with urban and agricultural use and industrial hud; Pre Villa María city agricultural and food industry (S5); C- Downstream: Post Villa María city (S6) and Pre Bell Ville city (S7), both of them characterized by an agricultural, urban and industrial use of land. Organisms have been collected in a low polluted site and exposed in the sites before described. After 96 hours exposure, they were removed and conserved for subsequent biomarkers? determination: metals accumulation (Fe, Cd, Cu, Zn, Ag, Hg, B, Al, Co, Ni, Pb, As, Ba, Sr, V, Mn), enzymatic activity and metallothioneins (MTs). Water and sediments samples have been recollected to physic-chemical parameters and metals concentration determinations. According to our results, the selected species responded at different levels of contamination to which they were exposed. A metal pollution gradient in sediments can be observed along the river, and a decrease in water quality index, from the upstream to downstream. In agreement, a significant differences have been observed in biomarkers levels among biomonitored sites. Metal levels in organisms? tissues augmented in the middle and downstream, especially in S4 where Cr, Fe, Al, Zn and Co showed higher concentrations. Enzymatic activities and MTs levels increased in areas before mentioned, standing out again the S4. According to our first results, the S4 should be the more contaminated, at least about metal contamination, among the biomonitored sites in our study. Probably the intense chemical and metallurgical industrial activities developed in Rio Tercero city, as well as the presence of tannerries, are the responsible of pollution biomonitored. Finally, the present study proved the rapid response of selected native species when they were exposed at aquatic contaminati