Abstract
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.
Highlights
Water quality has been the subject of recent studies in Brazil (Buzelli & Cunha-Santino, 2013; Cardoso-Silva et al, 2014; Oliveira et al, 2014) and abroad (Akoto & Abankwa, 2014; Dawson et al, 2015), specially because of pressure on hydric resources, due to increase in population density and the discharge of domestic and industrial effluents in water bodies, resulting in artificial eutrophication.The Metropolitan Region of São Paulo (MRSP) has eight water supply systems, composed of reservoirs and rivers, which provide 74.2 thousand m3 for a growing population (SABESP, 2015a)
Trophic State Index (TSI) for the studied period was calculated for each sampling site in each reservoir, and they were classified as eutrophic (Billings and Guarapiranga), mesotrophic (Jundiaí) and oligotrophic (Paiva Castro; Table 3)
According to TSI, for the studied period, Billings and Guarapiranga reservoirs were characterized as eutrophic environments, Jundiaí reservoir as mesotrophic and Paiva Castro reservoir as oligotrophic
Summary
Water quality has been the subject of recent studies in Brazil (Buzelli & Cunha-Santino, 2013; Cardoso-Silva et al, 2014; Oliveira et al, 2014) and abroad (Akoto & Abankwa, 2014; Dawson et al, 2015), specially because of pressure on hydric resources, due to increase in population density and the discharge of domestic and industrial effluents in water bodies, resulting in artificial eutrophication.The Metropolitan Region of São Paulo (MRSP) has eight water supply systems, composed of reservoirs and rivers, which provide 74.2 thousand m3 for a growing population (SABESP, 2015a). Water quality has been the subject of recent studies in Brazil (Buzelli & Cunha-Santino, 2013; Cardoso-Silva et al, 2014; Oliveira et al, 2014) and abroad (Akoto & Abankwa, 2014; Dawson et al, 2015), specially because of pressure on hydric resources, due to increase in population density and the discharge of domestic and industrial effluents in water bodies, resulting in artificial eutrophication. Most reservoirs suffer because of unplanned urban occupation, which implicates in further impacts in water quality (Tundisi, 2005), and this region is considered the second worldwide in terms of precarious water resources, partly due to the intense anthropogenic impact that it receives (Whately & Diniz, 2009). According to Di Bernardo et al (2010), reversing the process of artificial eutrophication in aquatic environments is extremely difficult and costly
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
