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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spatial evaluation of water quality in an urban reservoir (Billings Complex, southeastern Brazil)

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Author(s):
Simone Wengrat [1] ; Denise de Campos Bicudo [2]
Total Authors: 2
Affiliation:
[1] Instituto de Botânica. Núcleo de Pesquisa em Ecologia - Brasil
[2] Instituto de Botânica. Núcleo de Pesquisa em Ecologia - Brasil
Total Affiliations: 2
Document type: Journal article
Source: Acta Limnol. Bras.; v. 23, n. 2, p. 200-216, 2011-06-00.
Abstract

AIM: The study aimed at (a) contributing to a spatial evaluation of the Billings Complex water quality; (b) associating information on the geochemistry of the surface sediments; and (c) providing, based on previous studies, a temporal evaluation of the Complex's water quality since the Pinheiros River pumping restriction; METHODS: sampling was performed at 12 sites: 2 in the Central body (CB), 3 in the Taquacetuba branch (TQ), 3 in the Rio Pequeno branch (RP) and 4 in the Rio Grande Reservoir (RG). Water samples were taken along a vertical profile during the winter (August 2009) and summer (February 2010) and in the surface sediments (2 cm) during the winter. Physical and chemical characteristics of water and sediments were evaluated. Lamparelli's Trophic State Index (TSI) was calculated; RESULTS: limnological variability was mostly affected by the season. The spatial heterogeneity of the Complex was more pronounced during winter, with greater differences among its compartments. Nitrogen was higher in the winter, whereas in the summer there was a substantial phosphorus increase along with a nitrogen decrease. The most degraded compartments, associated with the highest nutrient levels, were CB and TQ. In contrast, the upstream region of the RP branch was considered a reference site (the least impacted) for the Complex; CONCLUSION: The Billings Complex ranged from mesotrophic (RP) or eutrophic (RG) to super-eutrophic (CC, TQ). High TSI variation also occurred within compartments and/or depending on the season, mainly associated with the human management of the Complex. The surface sediments underlined the differences observed between the extremes in the Billings Complex water quality, as well as providing additional information on other impacts that was not observed from the water analysis. A slight improvement in the water quality of the Central body and the Taquacetuba branch has been observed since 2009, possibly associated with the Pinheiros River flotation project. (AU)

FAPESP's process: 09/53898-9 - Paleolimnological reconstruction of Guarapiranga Reservoir and diagnosis of water and sediment current quality of SPMR water supply reservoirs facing their management
Grantee:Carlos Eduardo de Mattos Bicudo
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 04/08675-8 - History of eutrophication of Lago das Garças (PEFI, São Paulo) during the 20th century, based on the succession of diatoms in sediments
Grantee:Sandra Vieira Costa
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)