Toxicology of freshwater cyanobacteria

Liyanage, H.M.; Arachchi, D.N. Magana; Abeysekara, Tilak; Guneratne, L

doi:10.1080/10590501.2016.1193923

Cited by 16 publications

(4 citation statements)

References 192 publications

(75 reference statements)

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“…Some cyanoprokaryotes are hazardous, causing environmental and human health problems during their mass development, which is commonly referred to as a blooms (Paerl 2001;Merel et al 2013). Their negative effects are due mostly to the production of strain-specific, genecontrolled toxic metabolites (cyanotoxins), which have adverse acute or chronic health effects on mammals (including humans) and other organisms (including plants; Codd et al 1989Codd et al , 1999Codd et al , 2005aCodd et al , 2005bCarmichael 1994;Codd 1995;World Health Organization 1998;Chorus and Bartram 1999;Maršálek et al 2000;Meriluoto and Codd 2005;Mitrovic et al 2005;Metcalf and Codd 2012;Merel et al 2013;Walker 2015;Liyanage et al 2016). Therefore, the common term 'harmful algal blooms' (HABs) is used for blooms dominated by cyanoprokaryotes (abbreviated as CyanoHABs, C-HBs or cHAbs; e.g.…”

Section: Introductionmentioning

confidence: 99%

Pilot application of drone observations and pigment marker detection by HPLC in studies of cyanobacterial harmful algal blooms in Bulgarian inland waters

Stoyneva-Gärtner

Uzunov

Descy

et al. 2020

Mar. Freshwater Res.

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This paper describes the first use of aerial observations by a drone as an additional means for choosing sampling points during field studies of cyanobacterial harmful algal blooms (CyanoHABs) in selected Bulgarian waterbodies and the use of HPLC analysis of marker pigments for the fast determination of phytoplankton composition and biomass. The selection of waterbodies was based on the authors’ personal expertise and data collected over a 25-year period. In all sites chosen by drone, there were high levels of cyanobacteria and cyanotoxins were present: microcystins (MC-LR, MC-RR, MC-YR in Durankulak Lake and MC-LR and MC-RR in the Sinyata Reka Reservoir), cylindrospermopsin (in the Vaya Lake and in the Mandra Reservoir) and saxitoxins (in Durankulak Lake). The finding of cylindrospermopsin is the first in Bulgaria, the detection of saxitoxins is the first for Durankulak Lake and the microcystins records are the first for Sinyata Reka Reservoir. Considering the high total number of wetlands in Bulgaria, many of which are lowland, small and shallow and therefore vulnerable to CyanoHABs, we recommend further use of drones and HPLC in monitoring, which should speed up detection and reduce sampling efforts while enabling valuable information to be gathered.

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Section: Introductionmentioning

confidence: 99%

Pilot application of drone observations and pigment marker detection by HPLC in studies of cyanobacterial harmful algal blooms in Bulgarian inland waters

Stoyneva-Gärtner

Uzunov

Descy

et al. 2020

Mar. Freshwater Res.

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“…Even with all those bad consequences mentioned above, the frequent dominance by cyanobacteria in eutrophic waters is of additional concern to water quality considerations because of the ability of these organisms to produce toxins (Liyanage et al 2016). Most poisoning by cyanobacteria involves acute hepatotoxicosis caused by a structurally similar group of small molecular weight, cyclic hepta and pentapeptides referred to as microcystins and nodularins, respectively (Carmichael et al 1988).…”

Section: Eutrophication Effects In Water Qualitymentioning

confidence: 99%

Eutrophication: a threat to freshwater reservoirs and human health

Godoy

Radomski

Guerra

et al. 2019

Multi

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Eutrofização: uma ameaça aos reservatórios de água doce e à saúde humana RESUMO A eutrofização é um problema ambiental que resulta do incremento de nutrientes químicos (Fósforo e Nitrogênio) em um corpo hídrico, transformando de oligotrófico em eutrófico e, no pior dos casos, um estágio hipertrófico. Este processo pode ocorrer naturalmente ou devido à ação humana. Quando a ocorrência é natural, esse fenômeno ocorre lentamente devido ao aumento da matéria orgânica pelo escoamento natural do solo e pelos sedimentos das rochas. As ações antrópicas geram poluição pontual e difusa, fenômeno que favorece o agravamento do processo de eutrofização. O incremento químico induz um rápido aumento da produção primária de organismos fotossintéticos nos sistemas aquáticos, como fitoplâncton e cianobactérias, diminuindo a disponibilidade de luz pelo aumento da matéria orgânica e consequente depleção de oxigênio, resultando em perda de biodiversidade. A eutrofização causa perda da qualidade da água, essencial para a sobrevivência humana e o desenvolvimento de atividades sociais e econômicas. Os reservatórios eutróficos geralmente apresentam toxinas, gosto e odor indesejáveis e formação de DBPs na água potável, a purificação da água contaminada pode ser complexa e exigir medidas de longo prazo, tornando o processo bastante custoso. Portanto, ações para evitar a eutrofização dos ecossistemas são preferíveis. Às vezes a restauração de um ambiente perturbado é necessária, embora cara e complexa, para a qual apresentamos alguns métodos de tratamento de algumas substâncias químicas. PALAVRAS-CHAVE: eutrofização; meio ambiente; qualidade da água ABSTRACT Eutrophication is an environmental problem that results from the increment of chemical nutrients (Phosphorous and Nitrogen) in a water body, transforming from oligotrophic into eutrophic, and in worst cases a hypertrophic stage. This process can occur naturally or due to human action. When the occurrence is natural, this phenomenon occurs slowly due to increase of organic matter by natural runoff from the soil and rock sediments. The anthropic actions generate punctual and diffuse pollution, this phenomenon favor aggravation of eutrophication process. The increment chemical induces a quickly increase of primary production of photosynthetic organisms in the aquatic systems, like phytoplankton and cyanobacteria, decreasing the light availability by increase of organic matter and consequently depletion of oxygen, resulting in loss of biodiversity. Eutrophication causes loss of water quality that is essential for human survival and development of social and economic activities. The eutrophic reservoirs usually present toxins, undesirable taste and odor, and DBPs formation in drinking water, the purification of the contaminated water might be complex and require long-term measures, turning the process quite costly. Therefore, actions to prevent the eutrophication of ecosystems are preferable. Sometimes the restoration of a disturbed environment is necessary, although expensive and complex, f...

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“…In vertebrates, they act as the inhibitors of serine/threonine-specific protein phosphatases 1 and 2A (PP1 and PP2A), causing cytolysis with subsequent apoptosis of hepatocytes [ 10 , 11 ]. MCs are synthesized by many cyanobacteria species, such as representatives of the Microcystis (most commonly by Microcystis aeruginosa ), Oscillatoria , Aphanizomenon , Anabaena , Planktothrix, and Anabaenopsis genera, while NOD production was identified in Nostoc genera, Nodularia spumigena Mertens ex Bornet & Flahault, and Nodularia sphaerocarpa Bornet & Flahault [ 5 , 6 , 8 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Common Cyanotoxins and Their Effects on Fish

Falfushynska

Kasianchuk

Siemens

et al. 2023

Toxics

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Global warming and human-induced eutrophication drive the occurrence of various cyanotoxins in aquatic environments. These metabolites reveal diversified mechanisms of action, encompassing cyto-, neuro-, hepato-, nephro-, and neurotoxicity, and pose a threat to aquatic biota and human health. In the present paper, we review data on the occurrence of the most studied cyanotoxins, microcystins, nodularins, cylindrospermopsin, anatoxins, and saxitoxins, in the aquatic environment, as well as their potential bioaccumulation and toxicity in fish. Microcystins are the most studied among all known cyanotoxins, although other toxic cyanobacterial metabolites are also commonly identified in aquatic environments and can reveal high toxicity in fish. Except for primary toxicity signs, cyanotoxins adversely affect the antioxidant system and anti-/pro-oxidant balance. Cyanotoxins also negatively impact the mitochondrial and endoplasmic reticulum by increasing intracellular reactive oxygen species. Furthermore, fish exposed to microcystins and cylindrospermopsin exhibit various immunomodulatory, inflammatory, and endocrine responses. Even though cyanotoxins exert a complex pressure on fish, numerous aspects are yet to be the subject of in-depth investigation. Metabolites other than microcystins should be studied more thoroughly to understand the long-term effects in fish and provide a robust background for monitoring and management actions.

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Toxicology of freshwater cyanobacteria

Cited by 16 publications

References 192 publications

Pilot application of drone observations and pigment marker detection by HPLC in studies of cyanobacterial harmful algal blooms in Bulgarian inland waters

Pilot application of drone observations and pigment marker detection by HPLC in studies of cyanobacterial harmful algal blooms in Bulgarian inland waters

Eutrophication: a threat to freshwater reservoirs and human health

A Review of Common Cyanotoxins and Their Effects on Fish

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