Review of toxic species of Cyanobacteria in Brazil

Sant’Anna, Célia Leite; Azevedo, Maria Teresa de P.; Werner, Vera Regina; Dogo, C. R.; Rios, Fernanda R.; Carvalho, Luciana Retz de

doi:10.1127/1864-1318/2008/0126-0251

Cited by 69 publications

(48 citation statements)

References 33 publications

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“…A study conducted across Brazil showed that the conditions in most of its inland water bodies ranged from mesotrophic to eutrophic (Abe et al, 2006) due to population and economic growth in their corresponding watersheds, which has compromised the quality of water supplies and of water for other uses, mainly due to the occurrence of cyanobacterial blooms (Sant'Anna et al, 2008). Despite its significance for predicting events and the identification of environmental changes, such as those related to climate, hydrology, eutrophication and oligotrophication (Barbosa and Padisák, 2004;Valdes-Weaver et al, 2006), long-term limnological studies in inland waters are scarce in Brazil (Seeliger et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Limnological characterisation and phytoplankton seasonal variation in a subtropical shallow lake (Guaiba Lake, Brazil): a long-term study

Andrade

Giroldo

2014

Acta Limnol. Bras.

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Aim: to provide a long-term limnological characterisation of a subtropical shallow lake in addition to verifying seasonal differences, including phytoplankton variation. Methods: monthly sampling at sites IP, SJ and MD from 2000 to 2009 to analyse temperature -T; depth -Z; the depth of the euphotic zone -Z eu ; Z eu /Z (%); total suspended solids -TSS; dissolved oxygen -DO; pH; electrical conductivity -EC; N-NH 3 , N-NO 2 , N-NO 3 ; soluble reactive phosphorus -SRP; chlorophyll a -Chl-a and phytoplankton. Results: low values of Z and Z eu characterised the shallow and turbid conditions of lake and corresponded to the contribution of nano-microflagellates (Chlamydomonas sp., Spermatozopsis sp., Cryptomonas sp. and Rhodomonas sp ) and diatoms (Aulacoseira granulata). Z eu /Z (%), SRP and Chl-a were significantly different at site IP (meso-eutrophic) compared to sites SJ and MD (eutrophic). Phytoplankton density was also significantly higher at sites SJ and MD, and the largest relative contribution of Actinastrum sp., Dictyosphaerium sp., Micractinium sp., Monoraphidium sp., Scenedesmus/ Desmodesmus sp. and Euglena sp. corresponded to the most polluted waters at site SJ. The significantly higher T (°C) in summer corresponded to significantly higher Chl-a as well as a greater richness and density of phytoplankton. Cocconeis sp., Gomphonema sp. and Pinnularia sp. (pennated diatoms) were negatively correlated with temperature and were therefore more representative at the three sites in winter. Asterionella formosa was correlated with SRP and vernal blooms were recorded (2000)(2001). Planktothrix isothrix and Planktothricoides raciborskii were expressive in the summer/late summer (2004)(2005), and were significantly correlated with Chl-a and low SRP in water column. Conclusions:The study corroborated the sensitivity of phytoplankton in characterising different stages of eutrophication at different sites and corresponding watersheds as well as in characterising different seasons in a shallow lake in the subtropical zone of Brazil.Keywords: freshwater, algae, cyanobacteria, eutrofication.Resumo: Objetivo: prover caracterização limnológica de longa duração e verificar as variações sazonais associadas ao fitoplâncton em um lago raso subtropical no sul do Brasil. Métodos: coletas mensais em três locais (IP, SJ e MD), de 2000 a 2009, para as seguintes análises: temperatura -T; profundidade -Z; profundidade da zona eufótica -Z eu /Z (%); sólidos suspensos -TSS; oxigênio dissolvido -DO; pH; condutividade -EC; N-NH 3 , N-NO 2 , N-NO 3 ; fósforo solúvel -SRP; clorofila-a -Chl-a e fitoplâncton. Resultados: baixos valores de Z e Z eu caracterizaram a condição túrbida e rasa do lago e corresponderam à contribuição de Aulacoseira granulata e de flagelados nanomicroplanctônicos dos gêneros Chlamydomonas sp., Spermatozopsis sp., Cryptomonas sp. e Rhodomonas sp dos grupos X 2 e Y. Z eu /Z (%), SRP e Chl-a foram significativamente menores no ponto IP (meso-eutrófico) comparado aos pontos SJ e MD (eutróficos) onde a densidade d...

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Section: Discussionmentioning

confidence: 99%

Limnological characterisation and phytoplankton seasonal variation in a subtropical shallow lake (Guaiba Lake, Brazil): a long-term study

Andrade

Giroldo

2014

Acta Limnol. Bras.

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“…Particularly to C. raciborskii, it is very important to know the particular conditions that lead to its high abundance in water supply reservoirs due to its potential for producing cyanotoxins (Sant'Anna et al, 2008). C. raciborskii have been recorded as common and, in fact, dominant in many eutrophic to hypertrophic reservoirs in the Northeast of Brazil (Bouvy et al, 2000;Moura et al, 2007;Silva and Costa, 2015).…”

Section: Discussionmentioning

confidence: 99%

Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

et al. 2017

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The present study was carried out in Castanhão Reservoir, a large aquatic system in the Brazilian semi-arid region that serves multiples uses as water drinking supply and intensive fish-cage aquaculture site. In order to understand the effects of environmental conditions on the spatial and temporal variability of the phytoplankton functional groups (FG) and the main 'characterizing taxa', sub-superficial water samples were collected from March 2012 to August 2013, a period distinguished by the continuous drop in reservoir volume due to rainfall shortage. Eighteen functional groups and 102 total phytoplankton taxa were found in the Castanhão reservoir during the study. No significant differences were observed relative to spatial variation of total phytoplankton composition throughout the reservoir (PERMANOVA, P>0.05). On the other hand, according to cluster analysis results, three temporal phases have been identified (Similarity Profile, P<0.05), based on 102 phytoplankton taxa. The 'characterizing taxa' was found using the Similarity Percentage procedure (cut-off 90%), being thus defined as those taxa that contributed the most to the similarity within each temporal phase. Nineteen 'characterizing taxa' described the Castanhão reservoir, with predominance of those typical of mixing and turbidity conditions. Cyanobacteria dominated through the three temporal phases. According to the redundancy analysis, nutrient availability and water transparency were found to influence the phytoplankton temporal dynamics. The phase I (rainy season) was most represented by Planktolyngbya minor/Pl. limnetica (FG=S1), which reached best performance under strongly decreased phosphate-P concentrations and low water transparency. In phase II (dry season), Pseudanabaena sp.1 (FG=?) outcompeted other cyanobacteria probably due the increase in water transparency and decrease in ammonium-N. Finally, in phase III (rainy season) the decrease of water transparency triggered a recovery of shade-adapted cyanobacteria, but at this time mostly represented by Pseudanabaena limnetica (FG=S1). Phase III was also distinctive from the other ones by the highest Nitrate-N and phosphate-P concentrations related to thermocline disruption, which favored an increase in total phytoplankton biomass recorded by the augment of green algae density (FGs=X1, J and F). We concluded that the temporal dynamics of phytoplankton composition was associated to environmental changes in Castanhão Reservoir from 2012 to 2013, which were driven by seasonal climate variation from region (rainy/dry seasons), as well as, by the reduction in reservoir volume that resulted in the disruption of the thermocline, water mixing and an increase in inorganic P and N.

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“…There are several possible explanations for this finding. First, among the most important cyanobacteria in the systems where cyanotoxins were analyzed, only three species were potential producers of toxic microcystins (Planktolyngbya limnetica, Synechocystis aquatilis and Microcystis aeruginosa; Sant'Anna et al 2008). Second, the particular strains present may have been non-toxic.…”

Section: Discussionmentioning

confidence: 99%

Low water quality in tropical fishponds in southeastern Brazil

Costa

Appel

Macedo

et al. 2014

An. Acad. Bras. Ciênc.

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Expansion of aquaculture around the world has heavily impacted the environment. Because fertilizers are needed to raise fish, one of the main impacts is eutrophication, which lowers water quality and increases the frequency of algal blooms, mostly cyanobacteria. To evaluate whether the water quality in 30 fishponds in southeastern Brazilian met the requirements of Brazilian legislation, we analyzed biotic and abiotic water conditions. We expected that the high nutrient levels due to fertilization would cause low water quality. We also analyzed cyanotoxins in seston and fish muscle in some systems where cyanobacteria were dominant. The fishponds ranged from eutrophic and hypereutrophic with high phytoplankton biomass. Although cyanobacteria were dominant in most of the systems, cyanotoxins occurred in low concentrations, possibly because only two of the 12 dominant species were potential producers of microcystins. The high phosphorus concentrations caused the low water quality by increasing cyanobacteria, chlorophyll-a, turbidity, and thermotolerant coliforms, and by depleting dissolved oxygen. We found that all the 30 systems were inappropriate for fish culture, according to Brazilian legislation, based on at least one of the parameters measured. Furthermore, there was not any single system in the water-quality thresholds, according to the Brazilian legislation, to grow fish. Our findings indicate the need for better management to minimize the impacts of eutrophication in fishponds, in addition to a rigorous control to guarantee good food.

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Review of toxic species of Cyanobacteria in Brazil

Cited by 69 publications

References 33 publications

Limnological characterisation and phytoplankton seasonal variation in a subtropical shallow lake (Guaiba Lake, Brazil): a long-term study

Limnological characterisation and phytoplankton seasonal variation in a subtropical shallow lake (Guaiba Lake, Brazil): a long-term study

Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

Low water quality in tropical fishponds in southeastern Brazil

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