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| Author(s): |
Paulo Augusto Zaitune Pamplin
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 1999-10-14 |
| Examining board members: |
Odete Rocha;
Alaíde Aparecida Fonseca Gessner;
Maria Beatriz Bohrer Morel
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| Advisor: | Odete Rocha |
| Abstract | |
The present work aimed to evaluate the environmental quality, particularly of the water and sediment of Americana reservoir (SP, Brazil) with emphasis on the study of macroinvertebrate benthic community, and ecotoxicological parameters. This reservoir is located in the centrai-East region of São Paulo State (22°44\'S and 47°20\'W). lt has an important role in the regional development, and it is used for water supply both, public and industrial as well as for other uses. Americana reservoir is under high antropic influence due to urban and industrial development and population growth in the surroundings. As a consequence, the reservoir is suffering a progressive and accelerated eutrophication. In this study sampling was carried out at in two distinct periods, dry and rainy season. For physical, chemical and biological (benthic community), 15 and 13 samples were taken, respectively in the dry and rainy season. For ecotoxicological characterization 4 sampling stations were chosen, representative of the different reservoir compartments. Physical and chemical results indicate the eutrophic condition, particularly the low oxygen content, near the sediment. Macroinvertebrate benthic community was represented by 4 species of Oligochaeta, 4 species of Hirudinea, 1 species of Gastropoda and 1 O species of lnsecta, 1 belonging to the Ephemeroptera Order and 9 to the Diptera Order. Among the organisms Oligochaeta was dominant in both periods studied, representing more than 50% of total. Regarding the acute toxicity, the results indicate that the sediment of station E1 was toxic to Chironomus xanthus in the dry period and the sediment of E 1 O showed · indicatives of toxicity to Hyphessobrycon eques during the rainy period. lt can be concluded that environmental quality of the reservoir is considerably low. (AU) | |