Prospective study of acute health effects in relation to exposure to cyanobacteria

Lévesque, Benoît; Gervais, Marie-Christine; Chevalier, Pierre; Gauvin, Denis; Anassour-Laouan-Sidi, Elhadji; Gingras, Suzanne; Fortin, Nathalie; Brisson, Geneviève; Greer, Charles W.; Bird, David F.

doi:10.1016/j.scitotenv.2013.07.045

Cited by 100 publications

(77 citation statements)

References 24 publications

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“…asp) and contains almost no submerged macrophytes, whereas Roxton Pond is eutrophic (2004-2015 mean TP = 39 µg/L, and Chl a = 28 µg/L; http://www.mddelcc.gouv.qc.ca/eau/rsvl/ index.asp) and still contained dense and widespread submerged macrophyte beds at the time of sampling. Cyanobacteria are an important part of the contemporary phytoplankton community in both of these lakes and elevated levels of microcystin toxin have been reported (Giani et al, 2005;Lévesque et al, 2014;Monchamp et al, 2014). Both study lakes have had their water levels artificially raised by small dams constructed in the early to mid-twentieth century.…”

Section: Study Sitesmentioning

confidence: 99%

Extrinsic vs. Intrinsic Regimes Shifts in Shallow Lakes: Long-Term Response of Cyanobacterial Blooms to Historical Catchment Phosphorus Loading and Climate Warming

et al. 2017

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To evaluate the relative influence of intrinsic and extrinsic factors on ecosystem dynamics and regime shifts, we examined the algal response to historical catchment phosphorus loading from two shallow lakes located in Quebec, Canada. Roxton Pond is a eutrophic shallow lake with submerged macrophytes, and Lake Petit Saint-François (PSF) is a hypereutrophic shallow lake with no submerged macrophytes. Specifically, we inferred past cyanobacteria dynamics using pigment analyses, and tested whether the most parsimonious response model for cyanobacteria dynamics was congruent with the response model for phosphorus loading to the catchment. For both lakes, we found that an abrupt increase in cyanobacteria concentration lagged behind the initial increases in agricultural phosphorus use in the catchment as well as climate warming by over a decade. The delayed cyanobacterial response to these external drivers, observed in both lakes, suggests that intrinsic factors more than likely played important roles in ecosystem dynamics. These results show that cyanobacteria dominance in shallow lakes can be brought on by intrinsic responses to catchment phosphorus loading, climate warming, or both, but the timing depends on the antecedent conditions and the magnitude of the external forcing.

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Section: Study Sitesmentioning

confidence: 99%

Extrinsic vs. Intrinsic Regimes Shifts in Shallow Lakes: Long-Term Response of Cyanobacterial Blooms to Historical Catchment Phosphorus Loading and Climate Warming

et al. 2017

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“…Apart from making water treatment more difficult (the choking of filters), cyanobacterial blooms deteriorate the quality of water -not only by degrading its organoleptic properties (unpleasant taste and smell) but also by contaminating water with cyanotoxins that are microcystins, which belong to the group of hepatotoxins. Consuming water containing these hepatotoxins produces such symptoms as: acute liver damage, skin rash, fever, vomiting, and diarrhoea [7]. According to the WHO guidelines, the permissible threshold value of microcystin (MC-LR) in drinking water equals 1 µg·dm -3 [8].…”

Section: Introductionmentioning

confidence: 99%

The Occurence of Cyanobacteria Blooms in the Obrzyca River Catchment Area (Poland), a Source of Drinking Water

Piontek¹,

Czyżewska²,

Mankiewicz-Boczek³

2017

Pol. J. Environ. Stud.

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The issues presented in this study concern the important problem of the occurrence of cyanobacterial blooms in surface water used for water supply purposes. The objective of this study was to analyze the occurrence of cyanotoxic risk in the catchment area of the Obrzyca River, which is a source of drinking water for the inhabitants of Zielona Góra. At the points of Uście and at its tributary at Wojnowo, the river was more exposed to the blooms of toxigenic algae, whose active microcystins synthesize more here than in other places (Sadowo, Chwalim, Ostrzyce, Lubiatów). Throughout the study, conducted in 2008-12, we observed several times that the amounts of cyanobacteria exceeded 500·10 3 individuals per litre (ind.·dm , was found at Wojnowo in September 2011. The analysis of the physico-chemical water quality indicators showed that the places along the Obrzyca River where periodic cyanobacterial blooms took place were characterized by eutrophic conditions, and the total nitrogen to total phosphorus ratio (N/P) fell within the range of 10 to 16, and the water temperature exceeded 20ºC. In order to assess the toxic hazard caused by periodic cyanobacterial blooms in the catchment area of the Obrzyca River for drinking water for Zielona Góra residents, regular monitoring of the cyanobacteria and their toxins is required -especially at the points in Uście and Wojnowo as well as at the water intake at the water treatment plant (WTP) in Zawada (in central-western Poland).

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“…Mason Lake is within the heavily used recreational area of the William R. Mason Regional Park, and is located very close to the Newport Back Bay Estuary, which is a habitat for a number of rare and endangered birds. The high concentrations of MCY at these sites suggest serious health implications for both wildlife and humans since there are multiple routes of recreational exposure (Lé vesque et al 2004;Backer et al 2008;Backer et al 2010). The ubiquity of cyanobacteria is of concern in these coastal water bodies, which provide critical habitat for resident and migratory birds and fish, and are often sites of human recreational activities in this urbanized landscape (McLaughlin et al 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Harmful algal blooms (HABs) have increased in frequency and intensity worldwide in recent decades (Carmichael 2008;Heisler et al 2008;Hudnell and Dortch 2008;Paerl and Huisman 2009;O'Neil et al 2012;Paerl and Paul 2012). Cyanotoxins from harmful bloom-forming cyanobacteria (CyanoHABs) cause a number of negative impacts, including illness and mortality in humans, domestic pets, wildlife, and livestock; oxygen depletion; taste and odor problems; depressed growth of aquatic macrophytes; and loss of water quality (Paerl 1988;Carmichael 2001;Izaguirre and Taylor 2004;Lé vesque et al 2004;Paerl and Fulton 2006;Backer et al 2008;Backer et al 2010, Backer et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Screening Assessment of Cyanobacteria and Cyanotoxins in Southern California Lentic Habitats

Magrann

Meredith

Sutula

et al. 2015

EMSD

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Harmful bloom-forming cyanobacteria (CyanoHABs) and associated toxins are increasingly prevalent world-wide. We conducted a screening-level study to determine if cyanobacteria and associated cyanotoxins were present in Southern California coastal lakes, ponds, and seasonally tidal lagoons. We evaluated waterbody nutrient status and physiochemical parameters, land use, waterbody type, and habitat type, to determine their utility as screening factors for risk of CyanoHAB blooms. One-time grab samples were collected from 30 sites during July-September 2009. Samples were analyzed for phytoplankton taxonomic composition, nutrients, other physiochemical parameters, and three cyanotoxins: microcystins (MCY), anatoxin-a, and cylindrospermopsin. Cyanobacteria was the predominant taxonomic group in most water bodies in this study, and Microcystis spp. was the predominant genus in 96% of the study sites. Cyanobacteria were equally prevalent among coastal lagoons, depressional wetlands, and lakes in this study. We detected MCY in high concentrations in 10% of our sites, but neither anatoxin-a nor cylindrospermopsin were detected. All of the MCY-positive sites exceeded California action levels for recreational use and World Health Organization (WHO) guidance for human health effects. The prevalence of Microcystis spp. from all study sites indicates a high potential for MCY in these water bodies, although the one-time toxin grab samples likely underestimated the overall toxicity of these sites. Landscape variables, such as developed land use and dominant habitat type, were not found to be predictive indicators of cyanobacterial dominance. However, because cyanobacteria become consistently dominant when chlorophyll-a levels exceed 15 µg L -1 , chlorophyll-a can serve as a significant predictor of MCY.

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Prospective study of acute health effects in relation to exposure to cyanobacteria

Cited by 100 publications

References 24 publications

Extrinsic vs. Intrinsic Regimes Shifts in Shallow Lakes: Long-Term Response of Cyanobacterial Blooms to Historical Catchment Phosphorus Loading and Climate Warming

Extrinsic vs. Intrinsic Regimes Shifts in Shallow Lakes: Long-Term Response of Cyanobacterial Blooms to Historical Catchment Phosphorus Loading and Climate Warming

The Occurence of Cyanobacteria Blooms in the Obrzyca River Catchment Area (Poland), a Source of Drinking Water

Screening Assessment of Cyanobacteria and Cyanotoxins in Southern California Lentic Habitats

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