Dinâmica de protozoários patogênicos e cianobactérias em um reservatório de abastecimento público de água no sudeste do Brasil

Lopes, Ana Maria Moreira Batista; Gomes, Lenora Nunes Ludolf; Martins, Fabiana de Cerqueira; Cerqueira, Daniel Adolpho; Mota, César R.; Sperling, Eduardo von; Pádua, Valter Lúcio de

doi:10.1590/s1413-41522016143529

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…IMRE et al, 2017) as, according to Hachich et al (2004), lotic environments have a higher incidence of protozoa than lotic aquatic systems. Lopes et al (2017) found maximum concentrations of 0.8 cysts/L and 0.4 oocysts/L in the Vargem das Flores reservoir, a lentic environment intended for supplying Belo Horizonte, Minas Gerais. The lower occurrence of protozoa is associated with removal factors, including sedimentation and inactivation by temperature, ultraviolet radiation (UV) and predation (BROOKES et al, 2004).…”

Section: Resultsmentioning

confidence: 90%

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Silva

Scalize

2020

Eng. Sanit. Ambient.

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The protozoa Cryptosporidium spp. and Giardia spp. are etiological agents responsible for the transmission of gastroenteritis, mainly due to the consumption of contaminated water. Their (oo)cysts are resistant to adverse environmental conditions, as well as to most conventional water treatment processes. Thus, the objective of this work was to evaluate the occurrence of (oo)cysts of these protozoans in surface water collected for human consumption in the state of Goiás, Brazil. Fifteen samples of raw water were collected to assess the occurrence of (oo)cysts of the protozoa using the Membrane Filtration method, in addition to turbidity and pH analyses. Recovery rates in tests with ultrapure water reached the USEPA (2012) criteria for Giardia (78.1% ± 0%) and for Cryptosporidium (60.6% ± 32.6%); however, recovery in raw water was lower due to turbidity. All samples (n = 15) were positive for Cryptosporidium spp. oocysts, with a maximum concentration of 250 oocysts/L, demonstrating that these protozoa are disseminated in the aquatic environment of the state of Goiás and pose a risk to public health. Due to the use of water sources for public consumption, it is recommended that public authorities and sanitation companies act to preserve and maintain water courses, carry out periodic monitoring of treatment plants that supply the Cerrado, Santana and São Manoel streams and improve existing treatment technologies. The results did not allow to infer whether animal load and grazing area promote an increase in contamination of the lotic aquatic systems.

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Section: Resultsmentioning

confidence: 90%

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Silva

Scalize

2020

Eng. Sanit. Ambient.

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“…According to a study of on aquatic parasitosis [38], parasites were still present in river water samples in municipality of Tefé-Amazonas, between October and June because the temperature and humidity conditions were ideal such that they could survive in the external environment. According to [39,40], Brazil is a country in which published studies related to parasites in water are rare, which makes it difficult to ascertain the relative magnitude of parasite contamination.…”

Section: Discussionmentioning

confidence: 99%

Limnological Quality: Seasonality Assessment and Potential for Contamination of the Pindaré River Watershed, Pre-Amazon Region, Brazil

Muniz

Duarte

Braga

et al. 2020

Water

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Watersheds are defined as a set of lands where water drainage occurs through rivers and their tributaries. A large quantity of water resources exist in the state of Maranhão, Brazil, where rivers and their basins must meet environmental quality standards defined by the limits set out in national environmental council (CONAMA) legislation 357/05 for physicochemical and microbiological parameters, including parasites. Multivariate statistical techniques were applied to study the temporal and spatial variations in water quality of a segment of the Pindaré River. The data set included nine parameters for three sampling points over eleven months. Principal component analysis grouped the monitored sampling points into four clusters and identified electrical conductivity, temperature, total dissolved solids (TDS), pH, salinity, and Escherichia coli as being associated with the dry season and nitrite, nitrate, and turbidity as being associated with the rainy season. Three principal components explained 83.80% of the data variance during the rainy and dry seasons. The evaluated correlations indicated that during the rainy season, nitrite (~0.18 mg L−1) and turbidity (~46.00 NTU) levels were the highest, but pH was at its lowest (~6.61). During the dry season, TDS (~155.00 mg L−1) and pH (~8.10) were highest, and E. coli bacteria was more abundant.

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“…Por serem organismos fotossintetizante são dependentes da radiação solar para sobreviver, onde sua densidade varia conforme vários fatores tais como pH, Turbidez, Cor, e da demanda de nutrientes presente no manancial, onde os principais são o Fosforo e o nitrogênio, que geralmente é proveniente de descargas de efluentes provindos de residências e industrias. (Lopes et al, 2016). As variáveis climáticas também exercem grande influência no crescimento do fitoplâncton, como a insolação que tem correlação com o tempo em que o sol está descoberto por nuvens, precipitação na qual contribui para a diluição dos nutrientes (Oliver, 2014;Vieira et al, 2020;Albuquerque et al, 2021) Vários estudos tem mostrado a presença de reservatórios eutróficos no Brasil.…”

Section: Introductionunclassified

Influência de variáveis abióticas sobre os grupos morfofuncionais fitoplanctônicos de um reservatório eutrófico tropical no estado de Pernambuco

Ferreira¹,

Ferreira

Oliveira³

2022

RSD

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O fitoplâncton compreende a base alimentar no meio aquático, sendo formado por organismos autótrofos fotossintetizantes. Seu crescimento no ecossistema depende da influência de variáveis abióticas climáticas e físico-químicas da água, que atuam em sinergismo nos ambientes. A comunidade fitoplanctônica é representada pelos organismos que apresentam diferentes características morfofuncionais que permitem sua adaptação nos diferentes ecossistemas aquáticos. Esse estudo teve como objetivo avaliar a influência de variáveis climáticas e fisíco-químicas da água sobre a densidade dos grupos morfofuncionais fitoplanctônicos em um reservatório eutrófico localizado na região metropolitana do Recife (Pernambuco, Brasil). As coletas foram realizadas em 2 pontos distintos do reservatório, incluindo tanto períodos de estiagem como períodos chuvosos. As amostras foram armazenadas em frascos de vidro âmbar e preservadas em solução de formaldeído a 4% e refrigerada a 4°C. As análises físico-químicas da água seguiram metodologia específica. A análise quantitativa da comunidade fitoplanctônica foi realizada através de contagem em câmaras de Sedgewick-Rafter com auxílio de microscópio invertido, com aumento de 400x, sendo utilizado chaves dicotômicas específicas. Para avaliar a influência das variáveis abióticas sobre os grupos morfofuncionais fitoplanctônicos, foi utilizado o software gratuito R, versão 2.1.1. No período de análise foi identificado maior abundância do grupo funcional S1 sendo constituído pode cianobactéria com característica de serem melhores adaptados a ambientes com sombreamento. Observou-se que umidade relativa do ar e de cor aparente da água apresentaram influência significativa sobre os grupos morfofuncionais fitoplanctônicos.

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Dinâmica de protozoários patogênicos e cianobactérias em um reservatório de abastecimento público de água no sudeste do Brasil

Abstract: The current study monitored the water quality of a tropical reservoir (Vargem das Flores) used to supply potable water to seven cities in the metropolitan area of Belo Horizonte, Minas Gerais, southeast Brazil.

Cited by 10 publications

References 20 publications

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Limnological Quality: Seasonality Assessment and Potential for Contamination of the Pindaré River Watershed, Pre-Amazon Region, Brazil

Influência de variáveis abióticas sobre os grupos morfofuncionais fitoplanctônicos de um reservatório eutrófico tropical no estado de Pernambuco

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