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

2016 ◽  
Vol 77 (2) ◽  
pp. 323-331 ◽  
Author(s):  
S. A. Oliveira ◽  
C. E. M. Bicudo
Keyword(s):  
Chlorophyll A ◽  
Reference Conditions ◽  
Water Transparency ◽  
Metropolitan Region ◽  
Trophic State Index ◽  
Nitrogen And Phosphorus ◽  
Southeast Brazil ◽  
Water Characteristics ◽  
State Index ◽  
Reactive Silica

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.

APLIKASI CITRA LANDSAT 8 OLI UNTUK IDENTIFIKASI STATUS TROFIK WADUK GAJAH MUNGKUR WONOGIRI, JAWA TENGAH

2017 ◽  
Vol 19 (2) ◽  
pp. 113
Author(s):  
Kusuma Wardani Laksitaningrum ◽  
Wirastuti Widyatmanti
Keyword(s):  
Chlorophyll A ◽  
Total Phosphorus ◽  
Trophic State ◽  
Water Clarity ◽  
Coefficient Of Determination ◽  
Physical Factors ◽  
Landsat 8 ◽  
Trophic State Index ◽  
Landsat 8 Oli ◽  
State Index

<p align="center"><strong>ABSTRAK</strong></p><p class="abstrak">Waduk Gajah Mungkur (WGM) adalah bendungan buatan yang memiliki luas genangan maksimum 8800 ha, terletak di Desa Pokoh Kidul, Kecamatan Wonogiri, Kabupaten Wonogiri. Kondisi perairan WGM dipengaruhi oleh faktor klimatologis, fisik, dan aktivitas manusia yang dapat menyumbang nutrisi sehingga mempengaruhi status trofiknya. Tujuan dari penelitian ini adalah mengkaji kemampuan citra Landsat 8 OLI untuk memperoleh parameter-parameter yang digunakan untuk menilai status trofik, menentukan dan memetakan status trofik yang diperoleh dari citra Landsat 8 OLI, dan mengevaluasi hasil pemetaan dan manfaat citra penginderaan jauh untuk identifikasi status trofik WGM. Identifikasi status trofik dilakukan berdasarkan metode <em>Trophic State Index</em> (TSI) Carlson (1997) menggunakan tiga parameter yaitu kejernihan air, total fosfor, dan klorofil-a. Model yang diperoleh berdasar pada rumus empiris dari hasil uji regresi antara pengukuran di lapangan dan nilai piksel di citra Landsat 8 OLI. Model dipilih berdasarkan nilai koefisien determinasi (R<sup>2</sup>) tertinggi. Hasil penelitian merepresentasikan bahwa nilai R<sup>2</sup> kejernihan air sebesar 0,813, total fosfor sebesar 0,268, dan klorofil-a sebesar 0,584. Apabila nilai R<sup>2 </sup>mendekati 1, maka semakin baik model regresi dapat menjelaskan suatu parameter status trofik. Berdasarkan hasil kalkulasi diperoleh distribusi yang terdiri dari kelas eutrofik ringan, eutrofik sedang, dan eutrofik berat yaitu pada rentang nilai indeks 50,051 – 80,180. Distribusi terbesar adalah eutrofik sedang. Hal tersebut menunjukkan tingkat kesuburan perairan yang tinggi dan dapat membahayakan makhluk hidup lain.</p><p><strong>Kata kunci: </strong>Waduk Gajah Mungkur, citra Landsat 8 OLI, regresi, TSI, status trofik</p><p class="judulABS"><strong>ABSTRACT</strong></p><p class="Abstrakeng">Gajah Mungkur Reservoir is an artificial dam that has a maximum inundated areas of 8800 ha, located in Pokoh Kidul Village, Wonogiri Regency. The reservoir’s water conditions are affected by climatological and physical factors, as well as human activities that can contribute to nutrients that affect its trophic state. This study aimed to assess the Landsat 8 OLI capabilities to obtain parameters that are used to determine its trophic state, identifying and mapping the trophic state based on parameters derived from Landsat 8 OLI, and evaluating the results of the mapping and the benefits of remote sensing imagery for identification of its trophic state. Identification of trophic state is based on Trophic State Index (TSI) Carlson (1997), which uses three parameters there are water clarity, total phosphorus, and chlorophyll-a. The model is based on an empirical formula of regression between measurements in the field and the pixel values in Landsat 8 OLI. Model is selected on the highest value towards coefficient of determination (R<sup>2</sup>). The results represented that R<sup>2</sup> of water clarity is 0.813, total phosphorus is 0.268, and chlorophyll-a is 0.584. If R<sup>2</sup> close to 1, regression model will describe the parameters of the trophic state better. Based on the calculation the distribution consists of mild eutrophic, moderate eutrophic, and heavy eutrophic that has index values from 50.051 to 80.18. The most distribution is moderate eutrophication, and it showed the high level of trophic state and may harm other living beings.</p><p><strong><em>Keywords: </em></strong><em>Gajah Mungkur Reservoir, </em><em>L</em><em>andsat 8 OLI satellite imagery, regression, TSI, trophic state</em></p>

scholarly journals Effects of Environmental Factors on Nutrients Release at Sediment-Water Interface and Assessment of Trophic Status for a Typical Shallow Lake, Northwest China

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Dekun Hou ◽  
Jiang He ◽  
Changwei Lü ◽  
Ying Sun ◽  
Fujin Zhang ◽  
...  
Keyword(s):  
Trophic State ◽  
Algal Growth ◽  
Northwest China ◽  
Trophic State Index ◽  
Nitrogen And Phosphorus ◽  
Daihai Lake ◽  
Terrestrial Source ◽  
Limiting Nutrient ◽  
State Index

Surface sediment and water samples were collected from Daihai Lake to study the biogeochemical characteristics of nitrogen and phosphorus, to estimate the loads of these nutrients, and to assess their effects on water quality. The contents and spatial distributions of total phosphorus (TP), total nitrogen (TN), and different nitrogen forms in sediments were analyzed. The results showed that concentrations of TN and TP in surface sediments ranged from 0.27 to 1.78 g/kg and from 558.31 to 891.29 mg/kg, respectively. Ratios of C : N ranged between 8.2 and 12.1, which indicated that nitrogen accumulated came mainly from terrestrial source. Ratios of N : P in all sampling sites were below 10, which indicated that N was the limiting nutrient for algal growth in this lake. Effects of environment factors on the release of nitrogen and phosphorus in lake sediments were also determined; high pH values could encourage the release of nitrogen and phosphorus. Modified Carlson’s trophic state index (TSIM) and comprehensive trophic state index (TSIC) were applied to ascertain the trophic classification of the studied lake, and the values ofTSIMandTSICranged from 53.72 to 70.61 and from 47.73 to 53.67, respectively, which indicated that the Daihai Lake was in the stage of hypereutropher.

scholarly journals Trophic Status and Phytoplankton Limitation Conditions in a Few Bulgarian and Hungarian Danube River Wetlands

2016 ◽  
Vol 18 (2) ◽  
pp. 19-28
Author(s):  
Roumen Kalchev ◽  
Árpád Berczik ◽  
Michaela Beshkova ◽  
Mária Dinka ◽  
Hristina Kalcheva ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Trophic State ◽  
Trophic Status ◽  
Danube River ◽  
Trophic State Index ◽  
Secchi Disk ◽  
State Index

Abstract The phytoplankton limitation conditions in a few Bulgarian and Hungarian wetlands and in two more sampling sites, one for each Danube stretch, were investigated by means of trophic state index of Carlson (1977) for phytoplankton chlorophyll-a (CHL), Secchi disk depths (SD), total phosphorus (TP), and total nitrogen (TN) concentrations. Phytoplankton of both river sites was not limited by non-algal turbidity, nor was they phosphorus and nitrogen limited. In summer months the studied wetlands were predominantly nitrogen limited, while in spring and autumn limitation by non-algal turbidity prevailed.

scholarly journals Assessment of Temporal Variation of Water Quality Parameters and the Trophic State Index in a Subtropical Water Reservoir of Bangladesh

2021 ◽  
Vol 4 (3) ◽  
pp. 164-184
Author(s):  
Md. Sirajul Islam ◽  
Yousuf Ali ◽  
Md. Humayun Kabir ◽  
Rofi Md. Zubaer ◽  
Nowara Tamanna Meghla ◽  
...  
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Trophic State ◽  
Monsoon Season ◽  
Water Reservoir ◽  
Quality Parameters ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Trophic State Index ◽  
State Index

This study was conducted to determine the suitability of water quality for fisheries management in Kaptai Lake from February 2019 to January 2020. Results showed that the temperature, transparency, TDS, pH, DO, EC, alkalinity and hardness were 20.9 to 31.8°C, 17 to 303 cm, 40 to 105 mg/L, 6.82 to 7.96, 6.1 to 7.65 mg/L, 75.33 to 172.33 µS/cm, 37 to 83 mg/L and 35 to 190 mg/L, respectively. However, nutrients as NH3, NO3-, NO2-, PO43- and SO42- were 0.01 to 0.05, 0.03 to 2.21, 36 to 96, 0.01 to 0.04 and 0.3 to 1.9 mg/L, respectively. Chlorophyll a and trophic state index (TSI) were 0.70 to 2.12 µg/L and 27.43 to 37.79, respectively. Study revealed that SO42-, DO and TDS were higher than the standard of ECR. On the other hand, NH3, NO3-, NO2-, PO43-, temperature, transparency, pH, EC, total hardness, total alkalinity, Chlorophyll a and TSI were within the standard levels. Concentrations of NO3-, NO2-, PO43-, Chlorophyll a and TSI (CHL) showed no significant variation with seasons. Conversely, TDS, transparency, EC, alkalinity, hardness, and SO42- were lower in monsoon compared to pre-monsoon and post-monsoon seasons. Besides, temperature, NH3, DO and TSI (SD) were higher in monsoon season. Results concluded that the Kaptai Lake is in mesotrophic condition with TSI (CHL) less than 40, and prominently there was a positive relationship between Chlorophyll a and Trophic State Index (TSI). In this regard, major nutrients and Chlorophyll a concentration in the Kaptai Lake may have an impact on the aquatic environment.

DETERMINAÇÃO E AVALIAÇÃO DO ÍNDICE DE ESTADO TRÓFICO (IET) EM RIO URBANO LOCALIZADO NO ESTADO DO CEARÁ, BRASIL

2019 ◽  
Vol 21 (2) ◽  
pp. 730-744
Author(s):  
Francisco Bruno Monte Gomes ◽  
Davis Pereira De Paula
Keyword(s):  
Chlorophyll A ◽  
Total Phosphorus ◽  
Urban Space ◽  
Trophic State ◽  
Trophic State Index ◽  
Sampling Point ◽  
Water Sampling ◽  
State Index ◽  
High Concentrations ◽  
Del Rio

A pesquisa teve como objetivo analisar o índice de estado trófico no rio Acaraú localizado em Sobral-Ceará-Brasil. A metodologia consistiu em revisões bibliográficas, análises de campo, delimitação de cinco pontos amostrais ao longo do trecho fluvial, culminando na coleta de amostras de água e avaliação dos parâmetros de Clorofila “A” e Fósforo Total, no período de março/2015 a março/2016. O trecho do rio Acaraú no espaço urbano de Sobral foi dividido em cinco trechos principais, abrangendo entrada e saída. A Clorofila “A” apresentou uma crescente nas estações PT-3 (40,0 µg/L), PT-4 (32,0 µg/L), nos meses de setembro/15 e PT-5 (12,5 µg/L), para o mês de março/16, os menores resultados foram nas estações PT-1 (6,2 µg/L a 9,0 µg/L), PT-2 (6,7 µg/L a 8,0 µg/L). O Fósforo Total variou entre 0,02 mg/l em agosto/15 na estação PT-1 a 22,5 mg/l em dezembro/15 da estação de coleta PT-5. O cálculo do IET (Índice de Estado Trófico) se mostrou com nível de predominância no grau mesotrófico nos pontos PT-1, PT-3 e PT-5, entre agosto/15 a dezembro/15. O grau hipereutrófico foi resultado nos pontos PT-3, PT-4 e PT-5, afetados significativamente pelas elevadas concentrações de matéria orgânica e nutrientes. Portanto, conclui-se que as águas no rio Acaraú apresentaram vulnerabilidades aos processos de eutrofização, se fazendo necessária a implantação de um planejamento urbano eficiente.Palavras-chave: Eutrofização; Poluição hídrica; Qualidade de água; Rio urbano. ABSTRACTThe aim of this research was analyze the trophic state index in the Acaraú river located in Sobral-Ceará-Brazil. The methodology consisted of bibliographic reviews, field recognition, delimitation of five sampling points along the river, culminating in the water sampling and evaluation of the parameters of Chlorophyll "A" and Total Phosphorus, from March/2015 to March/2016. The section of the Acaraú River in the urban space of Sobral was divided into five main sections, including entrance and exit. Chlorophyll "A" increased in PT-3 (40.0 μg/L), PT-4 (32.0 μg/L) in September/15 and PT-5 (12.5 μg/L), for the month of  March/16, the lowest results were in PT-1 (6.2 μg/L at 9.0 μg/L), PT-2 (6.7 μg/L at 8.0 μg/L). Total Phosphorus ranged from 0.02 mg/L to 22.5 mg/L (August/15– December/15) at the PT-5 sampling point. The TSI (Trophic State Index) showed that there was predominance on mesotrophic degree at points PT-1, PT-3 and PT-5among August/15 and December/15. The hypereutrophic degree that was found in points PT-3, PT-4 and PT-5, were the results of a significant influence by high concentrations of organic matter and nutrients. Therefore, it is concluded that the waters in Acaraú River presents vulnerabilities to the eutrophication processes, and it is necessary to implement efficient urban planning.Keywords: Eutrophication; Water pollution; Water quality; Urban river. RESUMENLa investigación tuvo como objetivo analizar el índice de estado trófico en el río Acaraú ubicado en Sobral-Ceará-Brasil. La metodología consistió en revisiones bibliográficas, análisis de campo, delimitación de cinco puntos de muestreo a lo largo de la sección del río, que culminó con la recolección de muestras de agua y la evaluación de los parámetros de Clorofila "A" y Fósforo Total, de marzo/2015 a marzo/2016. El tramo del río Acaraú en el espacio urbano de Sobral se dividió en cinco tramos principales, que incluyen la entrada y la salida. La clorofila “A” presentó un crecimiento en las estaciones PT-3 (40.0 µg/L), PT-4 (32.0 µg/L) en septiembre/15 y PT-5 (12.5 µg/L). L), para el mes de marzo/16, los resultados más bajos fueron en PT-1 (6.2 µg/L a 9.0 µg/L), PT-2 (6.7 µg/L a 8.0 µg/L). El fósforo total varió de 0.02 mg/l en agosto/15 en la estación PT-1 a 22.5 mg/l en diciembre/15 desde la estación de recolección PT-5. El cálculo del EIT (Índice de estado trófico) fue predominantemente mesotrófico en PT-1, PT-3 y PT-5, del 15 de agosto al 15 de diciembre. El grado hipereutrófico se obtuvo en los puntos PT-3, PT-4 y PT-5, significativamente afectados por las altas concentraciones de materia orgánica y nutrientes. Por lo tanto, se concluye que las aguas del río Acaraú presentan vulnerabilidades a los procesos de eutrofización, lo que hace necesaria la implementación de una planificación urbana eficiente.Palabras clave: Eutrofización; Contaminación del agua; Calidad del agua; Río urbano.

scholarly journals Lagoon trophic state determination. Case of study Tecocomulco´s lagoon, Hidalgo, Mexico

DYNA ◽  
2019 ◽  
Vol 86 (209) ◽  
pp. 104-112
Author(s):  
FRANCISCO GARCIA GARCIA ◽  
Roberto Villagómez-Ibarra ◽  
Angélica E. Delgadillo-López ◽  
César A. González- Ramírez ◽  
Otilio A. Acevedo-Sandoval ◽  
...  
Keyword(s):  
Trophic State ◽  
Anthropogenic Impacts ◽  
Trophic Levels ◽  
Trophic State Index ◽  
Development Projects ◽  
Nitrogen And Phosphorus ◽  
Biological Condition ◽  
State Determination ◽  
State Index ◽  
Nitrogen Phosphorus

Because of anthropogenic impacts on the trophic state of Tecocomulco´s lagoon in Hidalgo, Mexico, the quantities of nitrogen, phosphorus, and other biologically useful nutrients are being increased in spite of they are the primary determinants of a body of water's trophic state index. Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water bodies, so increased concentrations tend to result in increased plant growth, followed by corollary increases in subsequent trophic levels. Consequently, a body of water's trophicindex may sometimes be used to make a rough estimate of its biological condition. Actually, in order to protect the environment, a new level of planning and execution of development projects have been originated by life cycle assessment, environmental impact researchesand evaluating economic financial researches due to the understanding that, environment will be irreversible damaged by any kind ofproject.

scholarly journals Water quality changes in floodplain lakes due to the Amazon River flood pulse: Lago Grande de Curuaí (Pará)

2011 ◽  
Vol 71 (3) ◽  
pp. 601-610 ◽  
Author(s):  
AG Affonso ◽  
C. Barbosa ◽  
EMLM. Novo
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Chlorophyll A ◽  
Water Use ◽  
Flood Pulse ◽  
Human Consumption ◽  
Trophic State Index ◽  
Amazon Floodplain ◽  
Marginal Areas ◽  
State Index

Assurance of water quality for human consumption is essential for public health policies. In the Amazon floodplain, the seasonal water level variation causes periodic flooding of marginal areas that are usually used for settlements, agriculture and livestock. Therefore, the exchange of materials between the terrestrial and aquatic ecosystem affects the proportion of suspended and dissolved components in water and its physical-chemical characteristics, and consequently the quality of the water used by local people. Following this approach, the aim of this study is to evaluate changes in water quality in Lago Grande de Curuaí floodplain, Óbidos, Pará in response to the flood pulse, during one hydrological year from 2003 to 2004, based on water use classes (according to National Water Agency 357/2005 resolution) using chlorophyll-a and dissolved oxygen concentration as parameters and the eutrophication index. Ordinary kriging was applied to interpolate chlorophyll-a and dissolved oxygen and to predict values at non sampled locations. Each location was then classified according to water use acceptable parameters and to Carlson Trophic State Index modified by Toledo to map lake water classes and trophic status. The result showed that Lago Grande de Curuaí floodplain is a supereutrophic system, with levels of dissolved oxygen and chlorophyll-a not suitable for human supply during the receding water phase. These areas are located near the riverine communities, which can cause health problems due to the presence of potentially toxic algae. Therefore, monitoring water quality in Amazon lakes is essential to ensure the availability has appropriate quality for human and animal supplies.

Application of eutrophication indices for assessment of the Bulgarian Black Sea coastal ecosystem ecological quality

2002 ◽  
Vol 46 (8) ◽  
pp. 19-28 ◽  
Author(s):  
S. Moncheva ◽  
V. Dontcheva ◽  
G. Shtereva ◽  
L. Kamburska ◽  
A. Malej ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Black Sea ◽  
Trophic State ◽  
Diversity Index ◽  
Principal Component ◽  
Environmental Parameters ◽  
Taxonomic Structure ◽  
Trophic State Index ◽  
Ecological Quality ◽  
State Index

The present paper is an attempt to test the applicability of the trophic state index (TRIX) for scaling the eutrophication along the Bulgarian Black Sea coastal zone in concert with a number of chemical and biological descriptors aimed at selection of relevant indicators of marine coastal area ecological quality. The following environmental parameters have been considered: to, salinity, nutrients - inorganic P, N and dissolved Si, dissolved oxygen and oxygen saturation, phytoplankton - taxonomic structure, abundance and biomass, chlorophyll a, zooplankton - taxonomic structure, abundance and biomass. Principal Component Analysis was applied in order to figure out and score the most relevant combination of parameters to discriminate between sites and select representative descriptors (pressure/state) of eutrophication. The following variables are defined as relevant descriptors for classification of the sites: nutrients (N, P, Si) and their molar ratios (N:P and Si:P), the capacity of the system to produce and sustain organic matter (chlorophyll a, phytoplankton biomass), phytoplankton taxonomic dominance (Bacilariophyceae:Dinophyceae biomass ratio), grazing pressure (phytoplankton:zooplankton biomass, Bacilariophyceae:Copepoda), plankton diversity index (Hb and Ha) and the trophic state index (TRIX). The investigated sites under a different anthropogenic impact are classified according to selected descriptors and their water quality state.

scholarly journals Chlorophyll a Concentration Distribution on the Mainland Coast of the Gulf of California, Mexico

2020 ◽  
Vol 12 (8) ◽  
pp. 1335
Author(s):  
Carlos Manuel Robles-Tamayo ◽  
Ricardo García-Morales ◽  
José Eduardo Valdez-Holguín ◽  
Gudelia Figueroa-Preciado ◽  
Hugo Herrera-Cervantes ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Gulf Of California ◽  
Concentration Distribution ◽  
Trophic State Index ◽  
Coastal Zones ◽  
Study Region ◽  
Chl A ◽  
Moderate Resolution ◽  
State Index ◽  
Moderate Resolution Imaging Spectroradiometer

Coastal zones are important areas for the development of diverse ecosystems. The analysis of chlorophyll a (Chl a), as an indicator of primary production in these regions, is crucial for the quantification of phytoplankton biomass, which is considered the main food chain base in the oceans and an indicator of the trophic state index. This variable is greatly important for the analysis of the oceanographic variability, and it is crucial for determining the tendencies of change in these areas with the objective of determining the effects on the ecosystem and the population dynamics of marine resources. In this study, we analysed the Chl a concentration distribution on the mainland coast of the Gulf of California based on the monthly data from July 2002 to July 2019, obtained from remote sensing (Moderate-Resolution Imaging Spectroradiometer Aqua (MODIS-Aqua) with a 9 km resolution). The results showed a clear distribution pattern of Chl a observed along this area with the maximum levels in March and minimum levels in August. A four-region characterisation on this area was used to make a comparison of the Chl a concentrations during warm and cold periods. The majority of the results were statistically significant. The spectral analysis in each of the four regions analysed in this study determined the following variation frequencies: annual, semi-annual, seasonal, and inter-annual; the last was related to the macroscale climatological phenomena El Niño-La Niña affecting the variability of the Chl a concentration in the study region.

scholarly journals Water quality in four reservoirs of the metropolitan region of São Paulo, Brazil

2015 ◽  
Vol 27 (4) ◽  
pp. 370-380 ◽  
Author(s):  
Denise Amazonas Pires ◽  
Andrea Tucci ◽  
Maria do Carmo Carvalho ◽  
Marta Condé Lamparelli
Keyword(s):  
Water Quality ◽  
Sao Paulo ◽  
Environmental Data ◽  
Metropolitan Region ◽  
Trophic State Index ◽  
São Paulo ◽  
State Index ◽  
Components Analysis ◽  
Physical And Chemical ◽  
Guarapiranga Reservoir

Abstract Aim: This paper describes some limnological variables of four reservoirs with different trophic status (Billings, Guarapiranga, Jundiaí and Paiva Castro) of the Metropolitan Region of São Paulo, Brazil, aiming to characterize the water quality in these reservoirs. Methods Water sampling occurred between October 2011 and September 2012, on subsurface, at the pelagic compartment. Physical and chemical characteristics of water were evaluated, and the Trophic State Index (TSI) was calculated. Multivariate Principal Components Analysis (PCA) was used to ordinate sampling sites and periods in relation to environmental data. Results Two reservoirs were classified as eutrophic (Billings and Guarapiranga), one as mesotrophic (Jundiaí) and one as oligotrophic (Paiva Castro). The highest concentrations of total phosphorus, nitrogen and chlorophyll a were recorded in the eutrophic reservoirs. The lowest values of dissolved oxygen concentration were registered at Guarapiranga reservoir. Residence time in Paiva Castro reservoir was very low (one day); on the other hand, the highest value was recorded in Billings reservoir: 428 days.

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