Toxicity of a cyanobacteria bloom in Barra Bonita Reservoir (Middle Tietê River, São Paulo, Brazil)

Sotero-Santos, Rosana B.; Silva, Carlos Roberto De Souza E.; Verani, Nelsy Fenerich; Nonaka, Keico Okino; Rocha, Odete

doi:10.1016/j.ecoenv.2005.03.011

Cited by 63 publications

(33 citation statements)

References 34 publications

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“…Currently there are two types of cyanotoxins that are particularly problematic to humans: hepatotoxins (cyclic peptides) and neurotoxins (alkaloids) (Sivonen, 1999;Stewart et al, 2008;Wiegand and Pflugmacher, 2005;Zurawell et al, 2005;Chen et al, 2009). Toxin-producing cyanobacteria have been responsible for serious cases of human and livestock poisoning and deaths in a number of countries worldwide (e.g., in Brazil, Australia and North America) (Francis, 1878;Beasley et al, 1989;Azevedo et al, 2002;Cox et al, 2005;Sotero-Santos et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

et al. 2014

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“…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%

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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“…Blue-green algae (cyanobacteria) not only possess bacteria-like cell structures and genetic characteristics, they also grow quickly and have high ability for nutrients competition. They form floating surface blooms, and some produce toxins (Sotero-Santos et al, 2006) and exo-polysaccharides (EPS) (Moreno et al, 2003). Cyanobacteria may affect the growth and survival of submerged macrophytes through the competition for nutrients and light and the production of allelopathic substances (Mulderij et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Interactions between a cyanobacterial bloom (Microcystis) and the submerged aquatic plant Ceratophyllum oryzetorum Kom.

Chen

et al. 2009

Chin. J. Ocean. Limnol.

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In aquatic ecosystems, macrophytes and phytoplankton are main primary producers, in which macrophyte plays an important role in maintaining clear water state, while phytoplankton often dominates in turbid waterbodies. In the present study, the growth and photosynthetic activity of the submerged aquatic plant Ceratophyllum oryzetorum Kom. in different cell densities of cyanobacterial bloom are studied. The results show that the plant length and fresh mass of C. oryzetorum are promoted by low cyanobacterial cell densities. Medium and high cyanobacterial cell densities, on the contrary, act as inhibitory. Furthermore, the photosynthetic activity of C. oryzetorum is strongly inhibited by high cyanobacterial cell densities. To a certain extent, the growth of cyanobacteria is inhibited by C. oryzetorum, but no significant effect is found in this study.

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Toxicity of a cyanobacteria bloom in Barra Bonita Reservoir (Middle Tietê River, São Paulo, Brazil)

Cited by 63 publications

References 34 publications

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

Toxic Cyanobacteria in Four Brazilian Water Supply Reservoirs

Interactions between a cyanobacterial bloom (Microcystis) and the submerged aquatic plant Ceratophyllum oryzetorum Kom.

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