Toxic cyanobacteria in reservoirs in northeastern Brazil: detection using a molecular method

Bittencourt-Oliveira, M. C.; Santos, Dos; Moura, Nascimento

doi:10.1590/s1519-69842010000500012

Cited by 20 publications

(17 citation statements)

References 30 publications

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“…The Mundaú reservoir was the one exhibiting the lowest occurrence of cyanobacteria with taxa potentially toxin producing ( [8,10,17].…”

Section: Discussionmentioning

confidence: 99%

“…Brazilian legislation for water supply monitoring to the human population requires monitoring of cyanobacteria cell density in raw water from the source, as well as of treated water for consumption, giving maximum allowed values of microcystins (1 µg·L -1 ) [6]. Bloom events featuring high concentrations of toxins in water supply reservoirs have been reported in different regions of Brazil, especially in the Southeast and Northeast [7][8][9][10][11][12][13][14][15]. This is due to favorable climate conditions, and particularly to the intense process of enrichment and eutrophication of water bodies, which favors cyanobacteria development [16].…”

Section: Introductionmentioning

confidence: 99%

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Toxic Cyanobacteria in Four Brazilian Water Supply Reservoirs

Piccin-Santos¹,

Bittencourt‐Oliveira²

2012

JEP

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Cyanobacterial blooms have become a worldwide concern due to the production of toxins harmful to humans and animals. In Brazil and worldwide, microcystins are the most frequently found cyanotoxin in water bodies. Four important reservoirs in Brazil's Southeast and Northeast regions were sampled to identify the cyanobacteria community and the occurrence of potential toxin-producing species in the country's public supply reservoirs. A total of 14 taxa were identified, 11 of which are known as potential toxin producers. Potentially toxic cyanobacteria were recorded at concentrations above 20,000 cells·mL -1 in all samples from all four reservoirs, thus requiring microcystin monitoring in drinking water according to Brazilian legislation. Although the sample from Mundaú reservoir showed the highest concentration of microcystins in water, it had one of the lowest values of cells·mL -1 , which demonstrates the non-correspondence between these two parameters. This calls into question the existence of a minimum level of potentially toxic cyanobacteria cells to merit the monitoring of microcystins in the treated water from these sources.

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“…The Mundaú reservoir was the one exhibiting the lowest occurrence of cyanobacteria with taxa potentially toxin producing ( [8,10,17].…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toxic Cyanobacteria in Four Brazilian Water Supply Reservoirs

Piccin-Santos¹,

Bittencourt‐Oliveira²

2012

JEP

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“…Several studies focusing on the presence and detection of cyanotoxins in public water supply reservoirs were carried out in some of the states in Northeast Brazil. These studies have described the presence of microcystins (Chellappa et al, 2008;Bittencourt-Oliveira et al, 2010; Piccin-Santos and Bittencourt-Oliveira, 2012; Vasconcelos et al, 2013;Mendes et al, 2016),…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial blooms in freshwaters bodies in a semiarid region, northeastern Brazil: A review

2017

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Harmful cyanobacterial blooms have caused several problems in freshwater environments due to their prolific growth and the harmful cyanotoxins produced by some species. The occurrence of these organisms has increased in recent decades due to climate change and eutrophication, although most studies are from temperate regions in the Northern hemisphere. This review presents data about cyanobacteria occurrence, dominance, and toxicity events in freshwater bodies in a semiarid region of Northeast Brazil, in the tropical Southern hemisphere. We performed a literature survey of cyanobacteria publications from 1930 to 2016. We made a list of all the dominant species registered in each state, noted their distribution and occurrence of dominance events involving one or more species, and the registered records of toxic blooms, including information about the toxins involved and the range of values. We selected 102 publications that described cyanobacteria Accepted Article www.jlimnol.it occurrence from states in Northeast Brazil; these publications included relevant contributions regarding cyanobacteria distribution, richness, density, and biomass. Forty-nine dominant species were recorded, with the most representation found in the state of Pernambuco (30 spp.). The genera with the highest occurrences were Microcystis, Cylindrospermopsis, Planktothrix, Dolichospermum (=Anabaena), and Geitlerinema, especially the species Cylindrospermopsis raciborskii, Microcystis aeruginosa, and Planktothrix agardhii. Episodes of toxic blooms were observed in four states. Microcystins, cylindrospermopsin, saxitoxins, and anatoxin-a(S) were found to be associated with these blooms. In Northeast Brazil, harmful cyanobacterial blooms are common in urban and public reservoirs. However, in recent years, cyanobacterial blooms in this region have been more intense and perennial, with high biomass occurring throughout the year.

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“…In Brazil, for example, several wastewater treatment plants (WWTP) use this technology due to the climate and the availability of land at a relatively low cost (Kellner and Pires, 2002;Pearson et al, 2005;Von-Sperling and Mascarenhas, 2005). However, cyanobacteria blooms have occurred in water reservoirs in northeastern Brazil (Molica et al, 2005;Bittencourt-Oliveira et al, 2010. These blooms are associated with certain abiotic factors, as reported by Paerl and Paul (2012), such as vertical stratification, nutrient availability and high temperatures throughout the year.…”

Section: Introductionmentioning

confidence: 99%

“…Reports on toxic cyanobacteria are more commonly associated with reservoirs for power generation or water supply, where high temperatures and eutrophication of the water bodies are typical (Azevedo et al, 1994;Domingos et al, 1998;Lagos et al, 1999;Molica et al, 2005;Bittencourt-Oliveira et al, 2010). In 1996, the first proven human deaths caused by cyanotoxins occurred in the city of Caruaru, Pernambuco, Brazil; 52 chronic kidney disease patients died due to the presence of microcystin in water, collected at a supply reservoir, treated through filters system, and then used in hemodialysis machines (Carmichael et al, 2001;Yuan et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of the phytoplankton community within a maturation pond in a semiarid region

Pastich

Gavazza

Casé³

et al. 2016

Braz. J. Biol.

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In northeastern Brazil, stabilization ponds are very suitable for wastewater treatment because of the relative great land availability and environmental conditions (e.g., high temperature) favorable for microorganism optimal development. However, blooms of potentially toxic cyanobacteria may affect the use of these treatment ponds due to resulting effluent poor quality. The objective of this study was to evaluate the dynamics of phytoplankton communities and the occurrence of cyanobacteria in a maturation pond located immediately after a series of two ponds. Temperature, dissolved oxygen, pH, BOD, N, and P were measured during a period of four months when samples were collected from the surface and the bottom of 7 sampling points distributed inside the pond. The phytoplankton of collected samples was also identified and classified using a conventional optical microscopy. Analysis of variance and Tukey test were used to evaluate the results. The three phytoplankton divisions found (Cyanophyta, Chlorophyta, and Euglenophyta) did not change considerably through surface and bottom. However, they changed greatly over the sampled months; great dominance of Cyanophyta was found at April and October, while Chlorophyta dominated the lagoon in September. Low superficial organic loads (between 78 and 109 kg BOD.ha -1 .d -1 ) and N:P ≤ 10 were the determinant factors that favored the predominance of Cyanophyta. The presence of two potentially toxic species of Cyanophyta, Oscillatoria sp. and Microcystis aeruginosa, indicates that caution is required when considering the final destination of treated effluent and suggests a need to assess the risks and benefits associated with the use of the treatment technology.Keywords: cyanobacteria, ecology, temporal variability, domestic sewage, effluent quality. Estrutura e dinâmica da comunidade fitoplanctônica de uma lagoa de maturação em região semiárida ResumoNo nordeste do Brasil, as lagoas de estabilização são muito adequadas para o tratamento de águas residuárias por causa da disponibilidade relativamente grande de terra e das condições ambientais (por exemplo, altas temperaturas) favoráveis ao melhor desenvolvimento dos microorganismos. Entretanto, florações de cianobactérias potencialmente tóxicas podem afetar o uso dessas lagoas de tratamento, devido à consequente qualidade inferior do efluente. O objetivo deste estudo foi avaliar a dinâmica das comunidades de fitoplâncton e a ocorrência de cianobactérias em uma lagoa de maturação situada após duas lagoas em série. Temperatura, oxigênio dissolvido, pH, DBO, N e P foram medidos durante um período de quatro meses, durante o qual amostras foram coletadas na superfície e fundo em sete pontos de amostragem da lagoa. As comunidades de fitoplâncton das amostras coletadas foram também identificadas e classificadas utilizando-se um microscópio óptico convencional. Para avaliar os resultados utilizou-se a análise de variância e o teste de Tukey. Para as três divisões de fitoplâncton encontradas (Cyanophyta, Chlorophyta e Eugleno...

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Toxic cyanobacteria in reservoirs in northeastern Brazil: detection using a molecular method

Cited by 20 publications

References 30 publications

Toxic Cyanobacteria in Four Brazilian Water Supply Reservoirs

Toxic Cyanobacteria in Four Brazilian Water Supply Reservoirs

Cyanobacterial blooms in freshwaters bodies in a semiarid region, northeastern Brazil: A review

Structure and dynamics of the phytoplankton community within a maturation pond in a semiarid region

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