INVESTIGADORES
DE TEZANOS PINTO paula
artículos
Título:
The assessment of water quality in Lower Luján River (Buenos Aires, Argentina): phytoplankton and algal bioassays
Autor/es:
O'FARRELL, INES; LOMBARDO, RUBEN; DE TEZANOS PINTO, PAULA; LOEZ, CAROLINA
Revista:
ENVIRONMENTAL POLLUTION
Editorial:
Elsevier Science Ltd
Referencias:
Lugar: Gran Bretana; Año: 2002 vol. 120 p. 207 - 218
ISSN:
0269-7491
Resumen:
The monitoring of river phytoplankton and several hydrological, physical and chemical variables, in combination with bioassays using Selenastrum capricornutum Printz, allowed the characterisation of three distinct reaches of the Lower River Lujan. The upstream stretch, characterised by the lowest depth and discharge, registered the highest nutrient, dissolved heavy metal and chlorophyll a concentrations in accordance with low phytoplankton diversity and the occurrence of several species typical of organically polluted lowland rivers. A downstream improvement, concomitant to increasing river discharge, is revealed by a progressive decrease of organic pollution parameters even though algal toxicity is registered through bioassays. The water input from the Parana´ River through the G. Arias Channel plays an important role in the regulation of the limnology of the Lower Lujan River. As a result of marked increasing discharge, depth and width, there is a decrease in nutrient concentration and phytoplankton density and an increase in dissolved oxygen concentration. Likewise, algal growth rates in the bioassays showed less toxic effect. # 2002 Elsevier Science Ltd. All rights reserved.
