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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.)

Seasonal variation of limnological features and trophic state index of two oligotrophic reservoirs of southeast Brazil

Full text
Author(s):
S. A. Oliveira [1] ; C. E. M. 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: Brazilian Journal of Biology; v. 77, n. 2, p. 323-331, 2016-09-26.
Abstract

Abstract Limnological features of two reservoirs were studied in dry (August 2013) and rainy (January 2014) periods to evaluate the water quality that supply the city of Guarulhos, southeast Brazil. Water samples were collected in three depths and the following characteristics were measured: alkalinity, dissolved O2, free and total CO2, HCO3, soluble reactive silica, dissolved and total nitrogen and phosphorus, and chlorophyll-a. Water transparency was also measured and temperature, pH and electric conductivity profiles were obtained. Great seasonal and low spatial variability of the water characteristics occurred in the reservoirs. High values of water transparency, free CO2 availability, and low of pH, soluble reactive silica and total and dissolved nutrients values were recorded at the dry period, and different conditions were found at the rainy season. The two reservoirs were characterized by low nutrients, chlorophyll-a and turbidity, and high transparency, these features being typical of oligotrophic systems. The two reservoirs still remain under low anthropogenic impact conditions, and are presently considered reference systems for the SPMR, São Paulo Metropolitan Region. The need for actions that will reduce the input of nutrients from the neighboring cities and the main tributaries of the hydrographic basin is emphasized to maintain the ecological quality of the reservoirs and their reference conditions among the SPRM reservoirs. (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