The eutrophication history of a tropical water supply reservoir in Brazil

Fontana, Luciane; Albuquerque, Ana Luíza Spadano; Brenner, Mark; Bonotto, Daniel Marcos; Sabaris, T. P. P.; Pires, Maria Aparecida Faustino; Cotrim, Marycel E.B.; Bicudo, Denise C.

doi:10.1007/s10933-013-9753-3

Cited by 71 publications

(67 citation statements)

References 42 publications

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“…In 1927, the city of Sã o Paulo began to use the reservoir as a public water supply, and today the reservoir is the main water source for the city, supplying drinking water to about 25% of the population. Fontana et al (2014) inferred the major ecological shifts (using diatoms and geochemical proxies) in the water body over the last 90 years related to multiple stressors, mainly the influence of forest flooding and eutrophication. The reservoir was oligotrophic from 1919 to 1947 and the onset of eutrophication occurred in the mid-1970s.…”

Section: Methodsmentioning

confidence: 99%

“…Costa-Böddeker et al 2012, Fontana et al 2014, to our knowledge floristic and taxonomical studies of sedimentary diatoms in long timescale in Brazil and probably in tropical regions have not been published. We presently documented the floristic survey and the spatial-temporal distribution of diatoms from the surface sediments (modern flora) and core (ca.…”

Section: Introductionmentioning

confidence: 94%

“…90 years, subfossil flora) of the Guarapiranga Reservoir along a spatial and temporal eutrophication gradient. The subfossil diatom assemblage was taxonomically studied and revised based on the ecological study of Fontana et al (2014). The Guarapiranga Reservoir is one of the most important public water supplies for the metropolitan region of São Paulo.…”

Section: Introductionmentioning

confidence: 99%

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Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

et al. 2016

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Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil. Biota Neotropica. 16(2): e20150129. http://dx.doi.org/10.1590/1676-0611- BN-2015-0129 Abstract: Fresh water biodiversity is an increasing concern due to growing human impact. Herein, we report a long-term survey (ca. 90 years) of sedimentary diatoms and the modern flora from surface sediments and their biodiversity changes along a eutrophication gradient. Study was carried out in one of the most important water supply reservoirs (Guarapiranga Reservoir) of Sã o Paulo Metropolitan Region, Brazil. Results are based on 75 core subsamples (subfossil assemblages from core) previously dated by 210 Pb and 14 samples from surface sediments (modern assemblages). Overall, 84 taxa were reported, belonging to 30 genera, 71 species and eight non-typical varieties, besides five probable new taxa. Results expanded two new additions for the Brazilian diatom flora (Chamaepinnularia submuscicula and Stauroneis acidoclinata) and 30 infrageneric taxa for the state of Sã o Paulo. 47.6% of total taxa inventoried were accounted exclusively for the subfossil assemblages indicating a significant biodiversity change over time. Access to past oligotrophic conditions and to contemporary mesotrophic regions of the Guarapiranga Reservoir accounted for these new additions representing 25% of the total diatom flora. Decline in the total species number along the trophic state gradient occurred for subfossil and modern assemblages. This pattern was even clearer when considering the changes in species richness over time. Eunotia with 21 taxa was the far most represented genera particularly in the oligotrophic phase. During the transitional period , richness gradually declined. With the onset (in the 1970s) and the major eutrophication period (since ca. 1990) occurred a drastic reduction in richness and the replacement of oligotrophic to eutrophic species. Human management also caused abrupt changes in richness. Marked decline occurred (1933) assotiated with hydrological impacts (water discharge increase) with the initial use of the reservoir as a public water supply. Unlike, sudden increase occurred probably associated with the application of algaecide to control cyanobacterial blooms. Present findings highlight the need for surveying the diatom assemblages in protected environments or in less degraded conditions for biodiversity assessment. Furthermore, reinforce the use of paleolimnological approach as in many cases the only tool to assess biodiversity changes encompassing time scales relevant to human-induced degradation and pre-anthropogenic impacts. Keywords: Bacillariophyta, biodiversity change, eutrophication, Guarapiranga Reservoir, paleolimnology, species richness.FAUSTINO, S.B., FONTANA, L., BARTOZEK, E.C.R., BICUDO, C.E.M., BICUDO, D.C. Composic¸ão e distribuic¸ão das diatomáceas de perfil sedimentar e sedimentos superficiais em reservatório de abastecimento no Sudeste do Brasil. Biota Neotropica. 1...

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

et al. 2016

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“…It is about five kilometres away from Xi'an City center and covers an area about 1 km 2 . It has been one of the most famous tourist attractions from ancient times.…”

Section: Study Areamentioning

confidence: 99%

“…So, an important mission for scientists is to monitor and predict the trophic status of lake water body in a timely and accurately manner. Phosphates, nitrates and ammonia are the common chemicals that cause eutrophication [1][2][3][4]. According to the driving force and the corresponding parameters [5,6], the continuum of water body trophic state is divided into three categories: oligotrophic, mesotrophic and eutrophic [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

GA-SVM Applied in Assessing the Water Trophic State of South Lake Qujiang based on Multispectral RS

Huo¹,

Zheng²,

Wang³

et al. 2017

J Environ Anal Toxicol

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Automated Determination of Cu(II), Pb(II), Cd(II) and Zn(II) in Environmental Samples by Square Wave Voltammetry Exploiting Sequential Injection Analysis and Screen Printed Electrodes

Ribeiro

Masini

2014

Electroanalysis

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This paper describes the development of a methodology for quantification of Cu(II), Pb(II), Cd(II) and Zn(II) in waters and sediments by anodic stripping voltammetry (ASV) automated by Sequential Injection Analysis (SIA) using a graphite screen printed sensor modified with mercury. Determinations were made by standard addition automated by the SIA system. The limits of detection and quantification were, respectively, 1.3 and 4.3 µg L−1 for Cu(II), 1.4 and 4.6 µg L−1 for Pb(II), 0.6 and 1.8 µg L−1 for Cd(II) and 4.2 and 14 µg L−1 for Zn(II). These limits were obtained for a sample volume of 1000 µL, flow rate of 10 µL s−1 (during the deposition step), and utilizing 3 flow reversals (volume of reversion=950 µL), totalizing a deposition time of 315 s. The potentiostat worked synchronically with the SIA system applying the conditioning potential of −0.1 V vs. pseudo reference of Ag (100 s), deposition potential of −1.0 V for Cu(II), Pb(II) and Cd(II) or −1,3 V for Zn(II), square wave frequency of 100 Hz, potential step of 6 mV and pulse height of 40 mV. For quantification of Zn(II) in sediment extracts, deposition of Ga0 on the working electrode was necessary to avoid the formation of intermetallic between Zn0 and Cu0. The accuracy of the method was assessed by spike and recovery experiments in water samples which resulted recovery rates near 100 % of the spiked concentrations. Recoveries of concentrations in the certified sediment sample CRM‐701 undergoing the three steps sequential extraction procedure of BCR varied from 71.7 % for Zn(II) in the acetic acid extract to 112.4 % for Cu(II) in the oxidisable fraction, confirming that the standard addition approach corrected the matrix effects in the complex samples of sediment extracts.

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The eutrophication history of a tropical water supply reservoir in Brazil

Cited by 71 publications

References 42 publications

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

GA-SVM Applied in Assessing the Water Trophic State of South Lake Qujiang based on Multispectral RS

Automated Determination of Cu(II), Pb(II), Cd(II) and Zn(II) in Environmental Samples by Square Wave Voltammetry Exploiting Sequential Injection Analysis and Screen Printed Electrodes

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