RODRIGUES CAPITULO Alberto
In situ tests for water quality assessment: a case study in Pampean rivers
GRAÇA, M.; RODRIGUES CAPÍTULO A; OCON C; GÓMEZ N.
PERGAMON-ELSEVIER SCIENCE LTD
Lugar: Amsterdam; Año: 2002 p. 4033 - 4040
Two invertebrate species (Hyalella curvispina and Palaemonetes argentinus) and one macrophyte (Egeria densa) froma naturally high nutrient content system (Pampean rivers of La Plata, Argentina) were evaluated for their potential usein situ assays aiming to assess changes in water quality. Invertebrates were individually placed in cylindrical chambers inpolluted sections of rivers and in reference upstream sites. Mortality after 48 h was high in polluted and reduced incontrol sites. Mortality was also higher in situ assays than in laboratory static tests. Standard sections of themacrophyte were also deployed at the reference and control sites. Growth (7 days) in terms of mass increment (but notin length) was consistently reduced in polluted sites. Results of benthic invertebrate and periphitic algae surveys wereconsistent with the in situ tests: pollution resulted in a decrease in the number of taxa, taxa replacement and in changesin the value of the biotic indices "Indice Biotico PAMPeano and ! !Indice de Diatomeas Pampeano, indicatingdeterioration of water quality. In situ assays have a high potential as environmental tools in integrated approaches ofbioassessment programs. r 2002 Elsevier Science Ltd. All rights reserved.