Toxic cyanobacteria and microcystin concentrations in a public water supply reservoir in the Brazilian Amazonia region

Vieira, J.B.; Azevedo, Maria Teresa de P.; Azevedo, Sandra Maria Feliciano de Oliveira e; Honda, Ricardo Yukio; Corrêa, Benedito

doi:10.1016/j.toxicon.2005.02.008

Cited by 71 publications

(38 citation statements)

References 19 publications

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“…Besides that, Sá et al (2010) noted an intense proliferation of the genera Anabaena and Microcystis in the left margin of the Tapajos River during a rising water period in 2007. Moreover, Vieira et al (2005) reported the first bloom of cyanobacteria in a water supply reservoir in the Amazon region in Belém, Pará State. The increase in these algae concentration in Amazon natural water bodies might be a problem for local communities that use this water for human and animal supply, fisheries, and recreation.…”

Section: Discussionmentioning

confidence: 99%

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

Affonso¹,

Barbosa²,

Novo³

2011

Braz. J. Biol.

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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.Keywords: Amazon várzea, chlorophyll-a, dissolved oxygen, eutrophication index, seasonality.Mudanças na qualidade da água nos lagos de planície de inundação em função do pulso de inundação do rio Amazonas: lago Grande de Curuaí, Pará ResumoA garantia da qualidade da água para consumo humano é essencial para as políticas de saúde pública. Na planície Amazônica a variação sazonal do nível de água provoca inundações periódicas das áreas marginais que são normalmente utilizadas para os assentamentos humanos, a agricultura e a pecuária. Portanto, a troca de materiais entre os ecossistemas terrestres e aquáticos afeta a proporção de componentes em suspensão e dissolvidos na água e suas características físico-químicas, o que, consequentemente, afeta a qualidade da água utilizada pela população local. Seguindo essa abordagem, o objetivo deste trabalho é avaliar as mudanças na qualidade da água na planície de inundação do lago Grande de Curuaí, Óbidos, Pará, em função do pulso de inundação, durante um ano hidrológico de 2003 a 2004, tendo por base tanto as classes de uso da água (de acordo com a Resolução nº 357/2005 da Agência Nacional de Água), usando como parâmetros tanto a concentração de clorofila-a e o oxigênio dissolvido, quanto o índice de eutrofização. Utilizou-se o método de krigagem para interpolar os dados de clorofila-a e de oxig...

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Section: Discussionmentioning

confidence: 99%

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

Affonso¹,

Barbosa²,

Novo³

2011

Braz. J. Biol.

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“…Cyanobacterial blooms and the adverse effects of their toxins are severe health threats to both animals and humans (Jochimsen et al, 1998;Pinho et al, 2003;dos S. Vieira et al, 2005). Microcystins (MCs) are a family of monocyclic heptapeptide hepatotoxins produced by freshwater species of cyanobacteria, such as Microcystis aeruginosa.…”

Section: Introductionmentioning

confidence: 99%

Effect of microcystin-LR on protein phosphatase 2A and its function in human amniotic epithelial cells

Liang

Tan

Zhang

et al. 2011

J. Zhejiang Univ. Sci. B

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Due to their toxicity, the increased distribution of microcystins (MCs) has become an important worldwide problem. MCs have been recognized as inhibitors of protein phosphatase 2A (PP2A) through their binding to the PP2A catalytic subunit. However, the exact mechanism of MC toxicity has not been elucidated, especially concerning the cellular response and its autoregulation. To further dissect the role of PP2A in MC-induced toxicity, the present study was undertaken to determine the response of PP2A in human amniotic epithelial (FL) cells treated with microcystin-LR (MCLR), one of the MC congeners. The results show that a low-dose treatment of MCLR in FL cells for 6 h induced an increase in PP2A activity, and a high-dose treatment of MCLR for 24 h decreased the activity of PP2A, as expected. The increased mRNA and protein levels of the PP2A C subunit may explain the increased activity of PP2A. Furthermore, MCLR altered microtubule post-translational modifications through PP2A. These results further clarify the underlying mechanism how MCLR affects PP2A and may be helpful for elucidating the complex toxicity of MCLR.

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“…In Brazil, where these events are very frequent, the most common freshwater bloom forming genera are Microcystis, Anabaena, Aphanizomenon, Planktothrix, and Cylindrospermopsis, which is also the most studied cyanobacterial group (3,6,18,24,28,33,38,40,43,47).…”

Section: Introductionmentioning

confidence: 99%

A toxic cyanobacterial bloom in an urban coastal lake, Rio Grande do Sul state, Southern Brazil

Carvalho¹,

Pípole²,

Werner³

et al. 2008

Braz. J. Microbiol.

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Reports of cyanobacterial blooms developing worldwide have considerably increased, and, in most cases, the predominant toxins are microcystins. The present study reports a cyanobacterial bloom in Lake Violão, Torres, Rio Grande do Sul State, in January 2005. Samples collected on January 13, 2005, were submitted to taxonomical, toxicological, and chemical studies. The taxonomical analysis showed many different species of cyanobacteria, and that Microcystis protocystis and Sphaerocavum cf. brasiliense were dominant. Besides these, Microcystis panniformis, Anabaena oumiana, Cylindrospermopsis raciborskii, and Anabaenopsis elenkinii f. circularis were also present. The toxicity of the bloom was confirmed through intraperitoneal tests in mice, and chemical analyses of bloom extracts showed that the major substance was anabaenopeptin F, followed by anabaenopeptin B, microcystin-LR, and microcystin-RR.

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Toxic cyanobacteria and microcystin concentrations in a public water supply reservoir in the Brazilian Amazonia region

Cited by 71 publications

References 19 publications

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

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

Effect of microcystin-LR on protein phosphatase 2A and its function in human amniotic epithelial cells

A toxic cyanobacterial bloom in an urban coastal lake, Rio Grande do Sul state, Southern Brazil

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