Identification of a microcystin in benthic cyanobacteria linked to cattle deaths on alpine pastures in Switzerland

Mez, Konstanze; Beattie, Kenneth A.; Codd, Geoffrey A.; Hanselmann, Kurt; Hauser, B.; Naegeli, Hanspeter; Preisig, Hans R.

doi:10.1080/09670269710001737029

Cited by 202 publications

(44 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of concern is the far greater cost to filter and disinfect water which has been polluted with cattle manure. In addition, aquatic systems subject to agricultural runoff commonly develop harmful algal blooms and subsequent algal toxins including Microcystis toxins [30–32]. Removing such toxins to make water acceptable for domestic systems is difficult and expensive [33].…”

Section: Discussionmentioning

confidence: 99%

Impact of Summer Cattle Grazing on the Sierra Nevada Watershed: Aquatic Algae and Bacteria

Derlet

Richards

Tanaka

et al. 2012

Journal of Environmental and Public Health

View full text Add to dashboard Cite

Introduction. We evaluated periphytic algal and microbial communities to assess the influence of human and cattle impact on Sierra water quality. Methods. 64 sites (lakes and streams from Lake Tahoe to Sequoia National Park, California) were sampled for suspended indicator bacteria and algae following standardized procedures. The potential for nonpoint pollution was divided into three categories: cattle-grazing areas (C), recreation use areas (R), or remote wildlife areas (W). Results. Periphyton was found at 100% of C sites, 89% of R sites, but only 25% of W sites. Eleven species of periphytic algae were identified, including Zygnema, Ulothrix, Chlorella, Spirogyra, mixed Diatoms, and Cladophoria. Mean benthic algae coverage was 66% at C sites compared to 2% at W sites (P < 0.05). The prevalence of E. coli associated with periphyton was 100% at C sites, 25% of R sites, and 0% of W sites. Mean E. coli CFU/gm of algae detected was: C = 173,000, R = 700, W = 0. (P < 0.05). Analysis of neighboring water for E. coli bacteria >100 CFU/100 mL: C = 91%, R = 8%, W = 0 (P < 0.05). Conclusion. Higher periphytic algal biomass and uniform presence of periphyton-attached E. coli corresponded to watersheds exposed to summer cattle grazing. These differences suggest cattle grazing compromises water quality.

show abstract

Section: Discussionmentioning

confidence: 99%

Impact of Summer Cattle Grazing on the Sierra Nevada Watershed: Aquatic Algae and Bacteria

Derlet

Richards

Tanaka

et al. 2012

Journal of Environmental and Public Health

View full text Add to dashboard Cite

show abstract

“…Numerous incidents of animal and human poisonings (Table 1) associated with cyanobacterial blooms were reported. However, risks of cyanotoxins need not to be exclusively restricted to planktonic cyanobacteria and eutrophicated waters, because animal deaths linked to toxic populations of benthic cyanobacteria have been documented as well (Edwards et al ., 1992) and lethal incidents occurred also in oligotrophic lakes (Mez et al ., 1997). …”

Section: Health Risks Of Cyanotoxinsmentioning

confidence: 99%

Toxins produced in cyanobacterial water blooms - toxicity and risks

Bláha¹,

Babica²,

Maršálek³

2009

Interdisciplinary Toxicology

255

155

View full text Add to dashboard Cite

Cyanobacterial blooms in freshwaters represent a major ecological and human health problem worldwide. This paper briefly summarizes information on major cyanobacterial toxins (hepatotoxins, neurotoxins etc.) with special attention to microcystins-cyclic heptapeptides with high acute and chronic toxicities. Besides discussion of human health risks, microcystin ecotoxicology and consequent ecological risks are also highlighted. Although significant research attention has been paid to microcystins, cyanobacteria produce a wide range of currently unknown toxins, which will require research attention. Further research should also address possible additive, synergistic or antagonistic effects among different classes of cyanobacterial metabolites, as well as interactions with other toxic stressors such as metals or persistent organic pollutants.

show abstract

“…In most cases, it seems that while the highest cyanobacterial proliferation happens in highly eutrophic water bodies, the highest concentration of dissolved microcystins seems to happen mainly in oligotrophic or mesotrophic waters [6].…”

Section: Introductionmentioning

confidence: 99%

“…The production of MCs by cyanobacteria seems more seasonally dependent in some places than in others [6,7] as a response to ecological conditions [8]. The ratio between intracellular and dissolved microcystins is mainly considered to be related to the release of microcystins by cyanobacterial cells under stress conditions or during their senescent stages [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of intracellular/dissolved ratios of microcystin-LR on its removal by ultrafi ltration

Ianelli

Bianchi

Carducci

et al. 2010

Desalination and Water Treatment

View full text Add to dashboard Cite

A B S T R AC TMicrocystins (MCs) are dangerous toxins produced by cyanobacteria in eutrophic waters, that are increasingly used worldwide for human consumption after potabilization.In this study, we present the results of laboratory and pilot-plant experiments, aimed at deepening the knowledge of the mechanisms governing the equilibrium of dissolved and particulate-bound MCs, and exploring the possible use of ultrafi ltration (UF) for their removal from eutrophic water within the potabilization treatment. Firstly, we analysed the presence of MCs in fi ltered water after three months of pure culture of Microcystis aeruginosa and different cycles of freezing and thawing, showing an increase of dissolved MCs due to cell breakage caused by the refrigeration cycles. Secondly, we performed fi ltration tests in a pilot UF plant, using samples of demineralised water and raw water from a eutrophic lake, both spiked with MCs. The tests demonstrated the possibility to remove MCs by adsorption rather than by mechanical seizing. The tests with demineralised water denoted a tendency to desorption after reaching the adsorption equilibrium, an adsorption isotherm less effective than the one observed in earlier lab-scale studies, and the need for very well controlled chemical washings to clean the membranes. Conversely, the raw lake water tests showed a higher removal effi ciency, allowing to reach a fi nal concentration of less than 1 µg/l, and a tendency to maintain the removal effi ciency for longer cycles. These results allow us to discuss the role of the adsorption-release process on the efficiency of the UF process, and suggests the exploration of non-conventional operating rules aimed at maximizing the removal of MCs by UF.

show abstract

Identification of a microcystin in benthic cyanobacteria linked to cattle deaths on alpine pastures in Switzerland

Cited by 202 publications

References 0 publications

Impact of Summer Cattle Grazing on the Sierra Nevada Watershed: Aquatic Algae and Bacteria

Impact of Summer Cattle Grazing on the Sierra Nevada Watershed: Aquatic Algae and Bacteria

Toxins produced in cyanobacterial water blooms - toxicity and risks

Effects of intracellular/dissolved ratios of microcystin-LR on its removal by ultrafi ltration

Contact Info

Product

Resources

About