Microcystin and Algal Chlorophyll in Relation to Nearshore Nutrient Concentrations in Lake Winnipeg, Canada

Pip, Eva; Bowman, Lindsay

doi:10.5539/ep.v3n2p36

Cited by 11 publications

(18 citation statements)

References 49 publications

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“…A summary of temperature and parameter values at the study sites is given in (Pip & Bowman, 2014). The seasonal free BMAA patterns at the three sites are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Samples were analyzed using ELISA; standards, reagents and quality control samples for microcystins (MC) were supplied by Beacon Analytical Systems Inc. (Portland, Maine) ( Pip & Allegro, 2010;Pip & Bowman, 2014). Cross reactivities for the polyclonal antibodies used to bind with MC (predominantly MC-LR) are given in Pip & Bowman (2014).…”

Section: Algal Toxinsmentioning

confidence: 99%

“…Temperature and pH were measured in situ using a thermometer and portable pH meter (Radiometer, Copenhagen). For rainfall estimates, daily precipitation data from the Gimli Climate Station (WMO ID 71748) on Lake Winnipeg were pooled for the four days preceding each sampling day (Pip & Bowman, 2014).…”

Section: Sampling Proceduresmentioning

confidence: 99%

“…Lake Winnipeg, the 10 th largest freshwater lake in the world, is of great importance for recreation, tourism, commercial and sport fisheries, and provides drinking water for several communities and many point-source users. This lake has experienced problem eutrophication for several decades, but studies regarding algal toxins have thus far focused on microcystins (Pip & Allegro, 2010;Pip & Bowman, 2014); other toxins such as BMAA have not been studied. Furthermore seminal data regarding seasonal fluctuations of BMAA in freshwater lakes are not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

Pip¹,

Munford²,

Bowman³

2016

Self Cite

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Seasonal fluctuation patterns of the neurotoxic amino acid β-N-methylamino-L-alanine (BMAA) were examined at four-day intervals during the ice-free season in water at three nearshore stations in the south basin of Lake Winnipeg, Canada. BMAA patterns were significantly exponentially correlated with concurrent phaeophytin, and inversely with chlorophyll a, indicating that free BMAA concentrations increased as blooms declined. BMAA was also significantly related to preceding microcystin concentrations, and as chlorophyll a declined, the proportion of BMAA relative to microcystin increased. Cross correlations identified significant relationships between BMAA and immediately preceding nitrate-N/inorganic phosphorus ratios, nitrate-N, rainfall, and a marginal inverse correlation with inorganic phosphorus. Total suspended solids levels were also significantly associated with BMAA, likely due to shading effects. A very high BMAA concentration was found under collapse of intense bloom conditions. These results have implications for water quality monitoring, nutrient management strategies and public health.

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“…A summary of temperature and parameter values at the study sites is given in (Pip & Bowman, 2014). The seasonal free BMAA patterns at the three sites are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Algal Toxinsmentioning

confidence: 99%

Section: Sampling Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

Pip¹,

Munford²,

Bowman³

2016

Self Cite

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“…For instance, there are small or hand held fluorometers that measure chlorohpyll a . Additionally, chlorophyll a is a very commonly measured component of water quality that is also known to be positively associated with microcystin-LR concentrations 11, 12 . Yuan et al (2014) explore these associations in detail and control for other related variables 12 .…”

Section: Introductionmentioning

confidence: 99%

Associations between chlorophyll a and various microcystin-LR health advisory concentrations

Hollister

Kreakie

2016

F1000Res

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Cyanobacteria harmful algal blooms (cHABs) are associated with a wide range of adverse health effects that stem mostly from the presence of cyanotoxins. To help protect against these impacts, several health advisory levels have been set for some toxins. In particular, one of the more common toxins, microcystin-LR, has several advisory levels set for drinking water and recreational use. However, compared to other water quality measures, field measurements of microcystin-LR are not commonly available due to cost and advanced understanding required to interpret results. Addressing these issues will take time and resources. Thus, there is utility in finding indicators of microcystin-LR that are already widely available, can be estimated quickly and in situ, and used as a first defense against high concentrations of microcystin-LR. Chlorophyll a is commonly measured, can be estimated in situ, and has been shown to be positively associated with microcystin-LR. In this paper, we use this association to provide estimates of chlorophyll a concentrations that are indicative of a higher probability of exceeding select health advisory concentrations for microcystin-LR. Using the 2007 National Lakes Assessment and a conditional probability approach, we identify chlorophyll a concentrations that are more likely than not to be associated with an exceedance of a microcystin-LR health advisory level. We look at the recent US EPA health advisories for drinking water as well as the World Health Organization levels for drinking water and recreational use and identify a range of chlorophyll a thresholds. A 50% chance of exceeding one of the microcystin-LR advisory concentrations of 0.3, 1, 1.6, and 2 g/L is associated with chlorophyll a concentration thresholds of 23.4, 67.0, 83.5, and 105.8, respectively. When managing for these various microcystin-LR levels, exceeding these reported chlorophyll a concentrations should be a trigger for further testing and possible management action.

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Modeling eutrophication risks in Tanes reservoir by using a hybrid WOA optimized SVR-relied technique along with feature selection based on the MARS approximation

Nieto

García–Gonzalo

Fernández³

et al. 2021

Stoch Environ Res Risk Assess

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Total phosphorus (from now on mentioned as TP) and chlorophyll-a (from now on mentioned as Chl-a) are recognized indicators for phytoplankton large quantity and biomass-thus, actual estimates of the eutrophic state-of water bodies (i.e., reservoirs, lakes and seas). A robust nonparametric method, called support vector regression (SVR) approach, for forecasting the output Chl-a and TP concentrations coming from 268 samples obtained in Tanes reservoir is described in this investigation. Previously, we have carried out a selection of the main features (biological and physico-chemical predictors) employing the multivariate adaptive regression splines approximation to construct reduced models for the purpose of making them easier to interpret for researchers/readers and to reduce the overfitting. As an optimizer, the heuristic technique termed as whale optimization iterative algorithm (WOA), was employed here to optimize the regression parameters with success. Two main results have been obtained. Firstly, the relative relevance of the models variables was stablished. Secondly, the Chl-a and TP can be successfully foretold employing this hybrid WOA/SVR-based approximation. The coincidence between the predicted approximation and the observed data obviously demonstrates the quality of this novel technique.

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Microcystin and Algal Chlorophyll in Relation to Nearshore Nutrient Concentrations in Lake Winnipeg, Canada

Cited by 11 publications

References 49 publications

Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

Associations between chlorophyll a and various microcystin-LR health advisory concentrations

Modeling eutrophication risks in Tanes reservoir by using a hybrid WOA optimized SVR-relied technique along with feature selection based on the MARS approximation

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