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

Oliveira, S A ; Bicudo, C E M

Brazilian journal of biology, 2017-04, Vol.77 (2), p.323-331 [Periódico revisado por pares]

Brazil: Instituto Internacional de Ecologia

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Título:
Seasonal variation of limnological features and trophic state index of two oligotrophic reservoirs of southeast Brazil
Autor: Oliveira, S A ; Bicudo, C E M
Assuntos: Alkalinity ; Anthropogenic factors ; BIOLOGY ; Brazil ; Carbon dioxide ; Chlorophyll ; Ecosystem biology ; Ecosystems ; Electrical resistivity ; Environmental impact ; Human influences ; Lakes - chemistry ; Limnology ; Metropolitan areas ; Nutrients ; oligotrophy ; pH effects ; Phosphorus ; Rainy season ; reference system ; Reference systems ; reservoir ; Reservoirs ; Seasonal variations ; seasonality ; Seasons ; Silica ; Silicon dioxide ; Temperature effects ; Transparency ; Tributaries ; Turbidity ; Water analysis ; Water Quality ; Water sampling ; Water shortages ; Water Supply
É parte de: Brazilian journal of biology, 2017-04, Vol.77 (2), p.323-331
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: 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.
Editor: Brazil: Instituto Internacional de Ecologia
Idioma: Inglês;Português

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

Oliveira, S A ; Bicudo, C E M

Brazil: Instituto Internacional de Ecologia

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