Cyanotoxins as a Possible Cause of Fish and Waterfowl Death in the Kazanka River (Russia)

Stepanova, N. Yu

doi:10.5593/sgem2018/5.1/s20.030

Cited by 6 publications

(7 citation statements)

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“…Such studies on anatoxins, cylindrospermopsins, and saxitoxins in rivers are sparse and focused on cyanobacterial-dominated events. Anatoxin-a has been measured in planktonic samples from rivers in Argentina (Aguilera et al 2018), Australia (John et al 2019), and Russia (Stepanova et al 2018) at concentrations up to 4 µg L −1 . To the best of our knowledge, this is the first report of anatoxin-a in a large US river.…”

Section: Cyanotoxinsmentioning

confidence: 99%

Cyanotoxin occurrence in large rivers of the United States

et al. 2020

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Cyanotoxins occur in rivers worldwide but are understudied in lotic ecosystems relative to lakes and reservoirs. We sampled 11 large river sites located throughout the United States during June-September 2017 to determine the occurrence of cyanobacteria with known cyanotoxinproducing strains, cyanotoxin synthetase genes, and cyanotoxins. Chlorophyll a concentrations ranged from oligotrophic to eutrophic (0.5-64.4 µg L − 1 ). Cyanobacteria were present in the algal communities of all rivers (82% of samples, n = 50) but rarely dominated the phytoplankton (0-52% of total abundance; mean = 8.8%). Pseudanabaena and Planktothrix occurred most often, and many (64%) of the cyanobacterial genera identified (n = 25) have known cyanotoxinproducing strains. Cyanotoxin synthetase genes occurred in all but one river. The mcyE and sxtA genes were most common, present in 73% of rivers and 44% and 40% of samples, respectively. The cyrA gene was less common (22% of samples) but occurred in 64% of rivers. The anaC gene was detected in one river (4% of samples). Anatoxin-a and microcystins were detected at low levels (0.10-0.38 µg L − 1 ) in 2 midcontinent rivers. Cylindrospermopsins and saxitoxins were not detected. Cyanobacteria, cyanotoxin synthetase genes, and cyanotoxins were present at low concentrations throughout this subset of US rivers. Eutrophic rivers located in the midcontinent region of the United States had the highest algal biomass, abundance of cyanotoxin synthetase genes, and cyanotoxin occurrence.

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Section: Cyanotoxinsmentioning

confidence: 99%

Cyanotoxin occurrence in large rivers of the United States

et al. 2020

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“…We have found references to only 11 cases of algal outbreaks in the reservoirs of Russia in 2016-2018 in the scientific articles [44][45][46][47][48][49][50][51][52][53][54]. In that time, four cases happened in 2016, six in 2017.…”

Section: Description Of Outbreaks In Scientific Articlesmentioning

confidence: 99%

“…The majority of articles (10 out of 11) focused on the cyanobacteria dominated blooms in freshwater reservoirs and the mediterranian Baltic and Azov Seas with relatively low salinity level [45][46][47][48][49][50][51][52][53][54]. Planktothrix agardhii, Planktolyngbya limnetica, Aphanizomenon flos-aquae, Microcystis aeruginosa, Dolichospermum spiroides, and Dolichospermum lemmermanii were noted among the dominating species in freshwater reservoirs.…”

Section: Description Of Outbreaks In Scientific Articlesmentioning

confidence: 99%

“…The determination of toxins concentration was conducted in three cases [44,46,47]. On August 2016, the algal bloom and the mass mortality of fish (gibel carp Carassius gibelio) and waterfowl (mallard Anas platyrhynchos) were detected in the Kazanka River (the tributary of the Volga River).…”

Section: Description Of Outbreaks In Scientific Articlesmentioning

confidence: 99%

“…The content of cyanotoxins in water according to the results of ELISA was 1.4-12.1 µg/L (microcystins) and 0.057-0.294 µg/L (anatoxin-a). The content of microcystins (1.96-3.16 µg/kg) and anatoxin-a (1.56-5.21 µg/kg) in fish and duck muscles were also determined [46].…”

Section: Description Of Outbreaks In Scientific Articlesmentioning

confidence: 99%

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Algal Bloom Occurrence and Effects in Russia

Намсараев

Melnikova

Комова

et al. 2020

Water

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Eutrophication caused by the entry of nutrients into a water body may lead to algal bloom. Russia possesses the world’s second highest supply of renewable freshwater resources and has faced the problem of eutrophication for many years. Nevertheless, as far as we know, no general analysis of Russia’s algal bloom situation has been before carried out. We have analyzed mass media and scientific reports about algal outbreaks from 2016 to 2018, which allowed us to determine the geographical distribution of algal blooms in Russia, as well as the major effects of eutrophication. As a result, we showed that algal blooms happened in all major climate zones and all federal districts. Cyanobacteria are the most frequently reported photosynthetic organisms comprising algal blooms in freshwater reservoirs located in the continental part of Russia and in the Baltic Sea. Dinoflagellate dominated blooms are more characteristic for the coastal parts of the northeastern Pacific Ocean. The largest number of reports comes from the south of the European part of Russia. However, we did not find significant correlations between state statistics data on factors possibly affecting eutrophication (e.g., population, arable land area, fertilizers, livestock, air temperature, etc.) and the number of algal outbreaks in the regions. Mass media analysis showed that algal blooms attract considerable public attention in Russia, which requires the scientific community to actively participate in solving the problem.

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Anatoxin-a: Overview on a harmful cyanobacterial neurotoxin from the environmental scale to the molecular target

Colas

Marie

Lance

et al. 2021

Environmental Research

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Anatoxin-a (ATX-a) is a neurotoxic alkaloid, produced by several freshwater planktonic and benthic cyanobacteria (CB). Such CB have posed human and animal health issues for several years, as this toxin is able to cause neurologic symptoms in humans following food poisoning and death in wild and domestic animals. Different episodes of animal intoxication in the wild have incriminated ATX-a, as confirmed by the presence of ATX-a-producing CB in the consumed water or biofilm and/or the observation of neurotoxic symptoms, which match experimental toxicity in vivo.Regarding toxicity parameters, toxicokinetics knowledge is currently incomplete and needs to be improved. The toxin is able to cross passively biological membranes and act rapidly on nicotinic receptors, its main molecular target. In vivo and in vitro acute effects of ATX-a have been studied and make possible to draw its mode of action, highlighting its deleterious effects on the nervous systems and its effectors, namely muscles, heart and vessels, and the respiratory apparatus. However, very little is known about its putative chronic toxicity. This review updates available data on ATXa, from the ecodynamic of the toxin to its physiological and molecular targets.

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Cyanotoxins as a Possible Cause of Fish and Waterfowl Death in the Kazanka River (Russia)

Cited by 6 publications

References 0 publications

Cyanotoxin occurrence in large rivers of the United States

Cyanotoxin occurrence in large rivers of the United States

Algal Bloom Occurrence and Effects in Russia

Anatoxin-a: Overview on a harmful cyanobacterial neurotoxin from the environmental scale to the molecular target

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