Constructed wetland mesocosms improve the biodegradation of microcystin-LR and cylindrospermopsin by indigenous bacterial consortia DOI

Lasse Ahrenkiel Thyssen,

Pedro Martinez i Quer,

Carlos A. Arias

et al.

SSRN Electronic Journal, Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 1, 2023

Cyanobacterial blooms releasing harmful cyanotoxins, such as microcystin (MC) and cylindrosper-mopsin (CYN), are prominent threats to human animal health. Constructed wetlands (CW) may be a nature-based solution for bioremediation of lake surface water containing due its low-cost requirement infrastructure environmentally friendly operation. There is recent evi-dence that microcystin-LR (MC-LR) can efficiently removed in CW microcosms where CYN deg-radation unknown. Likewise, the mechanistic background regarding cyanotoxins transfor-mation not yet elucidated. In present study, objective was compare MC-LR degradation efficiencies by two similar microbial communities obtained from mesocosms, different experiments setup: 1) vitro batch experiment serum bottles with an introduced community, 2) mesocosms. were spiked at 100 µg L-1 200 spiked. The results showed degraded ≤1 within seven days both experiments, however, markedly higher rate constant mesocosms (0.18 day-1 0.75 day-1, respectively). No removal detected incubations, whereas around 50% re-moved community responded cyanotoxin treatment, most increase bacteria affiliated Methylophilaceae (order: Methylophilales, phylum: Proteobacteria). strongly indicate CWs develop ac-tive capable efficient CYN. However, opera-tional conditions need optimized achieve full degradation. To best our knowledge, this study first report ability degrade

Language: Английский

A short-term exposure to saxitoxin triggers a multitude of deleterious effects in Daphnia magna at levels deemed safe for human health DOI Creative Commons
Albano Pinto, Inês P. E. Macário, Sérgio Marques

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175431 - 175431

Published: Aug. 14, 2024

Harmful algal blooms and the toxins produced during these events are a human environmental health concern worldwide. Saxitoxin its derivatives potent natural aquatic neurotoxins by certain freshwater cyanobacteria marine algae species bloom events. Saxitoxins effects on well studied, however biota still largely unexplored. This work aims at evaluating of pulse acute exposure (24 h) model cladoceran Daphnia magna to 30 μg saxitoxin L

Language: Английский

Citations

5
The spatiotemporal distribution of potential saxitoxin-producing cyanobacteria in western Lake Erie DOI Creative Commons

Callie Nauman,

Keara Stanislawczyk, Laura A. Reitz

et al.

Journal of Great Lakes Research, Journal Year: 2024, Volume and Issue: 50(3), P. 102342 - 102342

Published: March 30, 2024

Cyanobacterial blooms in the western basin of Lake Erie have been well studied with a focus on planktonic Microcystis and cyanotoxin microcystin, but recent research has shown that are not entirely Microcystis. Previous studies documented other taxa capable producing cyanotoxins. Furthermore, benthic cyanobacteria historically overlooked Erie. Saxitoxin is emerging concern freshwater, sxtA gene which encodes its production found Maumee River central Collectively, these points indicated saxitoxin-producing may also occur basin. We utilized three sources data to determine spatial temporal distribution potential water column (years 2018–2022) deployed nutrient diffusing substrata (NDS) impact nutrients, depth, season potential-STX 2018 & 2019). The datasets showed "hotspots" lasted only few weeks. copies per mL did correlate Dolichospermum or Aphanizomenon biovolume, associated elsewhere. In NDS, saxitoxin (ng/cm2) chlorophyll were inversely correlated highest September at deeper whereas was during June shallower depth. This suggests continued monitoring needed drivers basin, we recommend future should solely microcystins blooms.

Language: Английский

Citations

4
A critical review of current research on Cyanobacterial cells and associated toxins in aquatic environments: occurrence, impact, and treatment methods DOI
Michel A. Kordahi, George M. Ayoub, Ramez M. Zayyat

et al.

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 113931 - 113931

Published: Aug. 26, 2024

Language: Английский

Citations

4
Cyanotoxins on the move - Freshwater origins with marine consequences: A systematic review of global changes and emerging trends DOI

M Salvande Fraga,

Catarina Churro,

José Leão-Martins

et al.

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 216, P. 118017 - 118017

Published: April 24, 2025

Language: Английский

Citations

0
Constructed wetland mesocosms improve the biodegradation of microcystin-LR and cylindrospermopsin by indigenous bacterial consortia DOI Creative Commons

Lasse Ahrenkiel Thyssen,

Alba Martínez i Quer, Carlos A. Arias

et al.

Harmful Algae, Journal Year: 2023, Volume and Issue: 131, P. 102549 - 102549

Published: Nov. 27, 2023

Cyanobacterial blooms releasing harmful cyanotoxins, such as microcystin (MC) and cylindrospermopsin (CYN), are prominent threats to human animal health. Constructed wetlands (CW) may be a nature-based solution for bioremediation of lake surface water containing due its low-cost requirement infrastructure environmentally friendly operation. There is recent evidence that microcystin-LR (MC-LR) can efficiently removed in CW microcosms where CYN degradation unknown. Likewise, the mechanistic background regarding cyanotoxins transformation not yet elucidated. In present study, objective was compare MC-LR efficiencies by two similar microbial communities obtained from mesocosms, different experiments setup: 1) vitro batch experiment serum bottles with an introduced community, 2) mesocosms. were spiked at 100 µg L−1 200 spiked. Results showed degraded ≤1 within seven days both experiments. However, markedly higher rate constant mesocosms (0.18 day−1 0.75 day−1, respectively). No removal detected incubations, whereas around 50% The community responded cyanotoxin treatment, most increase bacteria affiliated Methylophilaceae (order: Methylophilales, phylum: Proteobacteria). results strongly indicate CWs develop active capable efficient CYN. operational conditions need optimized achieve full degradation. To best our knowledge, this study first report ability degrade

Language: Английский

Citations

8
Photochemical Degradation of Saxitoxins in Surface Waters DOI
Kari E. Norris, Tyler Kurtz, Shiru Wang

et al.

ACS ES&T Water, Journal Year: 2024, Volume and Issue: 4(2), P. 346 - 354

Published: Jan. 24, 2024

Photochemical degradation has been shown to be a significant pathway in the environmental fate of many cyanotoxins, compounds produced by harmful cyanobacteria. However, there lack research on photochemical saxitoxins. This project evaluated direct and sensitized photodegradation three saxitoxin analogues including (STX), gonyautoxin-2 −3 (GTX 2/3), n-sulfocarbamoyl-gonyautoxin-1 −2 (C 1/2). Irradiation STX presence or absence dissolved organic matter (DOM) revealed that none toxins undergo photolysis at pH 6 8, only GTX 2/3 8. Sensitized half-lives ranged from 1 10 h for 2/3. The contribution reactive intermediates singlet oxygen (1O2), triplet-state (3DOM*), hydroxyl radicals (•OH) was assessed, with 3DOM* accounting majority degradation. Additionally, transformation product candidates were identified STX, an electron-transfer mechanism proposed. kinetics, mechanism, products phototransformation are essential understanding persistence these surface waters assessing impacts algal blooms.

Language: Английский

Citations

2
Prevalence and distribution of dissolved paralytic shellfish toxins in seawater in the Yellow Sea and the Bohai Sea, China DOI

Xiaoyun Wang,

Jiangbing Qiu, Dongyue Li

et al.

Harmful Algae, Journal Year: 2024, Volume and Issue: 139, P. 102730 - 102730

Published: Sept. 23, 2024

Language: Английский

Citations

1
Spatial and Temporal Variability of Saxitoxin-Producing Cyanobacteria in U.S. Urban Lakes DOI Creative Commons
Youchul Jeon,

Ian Struewing,

Kyle McIntosh

et al.

Toxins, Journal Year: 2024, Volume and Issue: 16(2), P. 70 - 70

Published: Feb. 1, 2024

Harmful cyanobacterial blooms (HCBs) are of growing global concern due to their production toxic compounds, which threaten ecosystems and human health. Saxitoxins (STXs), commonly known as paralytic shellfish poison, a neurotoxic alkaloid produced by some cyanobacteria. Although many field studies indicate widespread distribution STX, it is understudied relative other cyanotoxins such microcystins (MCs). In this study, we assessed eleven U.S. urban lakes using qPCR, sxtA gene-targeting sequencing, 16S rRNA gene sequencing understand the spatio-temporal variations in cyanobacteria potential role STX production. During blooms, qPCR analysis confirmed presence STX-encoding at all lakes. particular, abundance had strong positive correlation with concentrations Big 11 Lake Kansas City, was also site highest quantified concentration. Sequencing revealed that producers, Aphanizomenon, Dolichospermum, Raphidiopsis, were present. Further targeting amplicons identified Aphanizomenon and/or Dolichospermum primary producer, showing significant abundances concentrations. addition, associated environmental factors, conductivity, sulfate, orthophosphate, whereas correlated temperature pH. Overall, results herein enhance our understanding STX-producing aid developing strategies control HCBs.

Language: Английский

Citations

1
Aerosolized algal bloom toxins are not inert DOI Creative Commons
Eric P. Vejerano, Jeonghyeon Ahn, Geoffrey I. Scott

et al.

Environmental Science Atmospheres, Journal Year: 2024, Volume and Issue: 4(10), P. 1113 - 1128

Published: Jan. 1, 2024

Harmful algal blooms (HABs) are projected to become increasingly prevalent, extending over longer periods and wider geographic regions due the warming surface ocean water other environmental factors, including but not limited nutrient concentrations runoff for marine freshwater environments. Incidents of respiratory distress linked inhalation aerosols containing HAB toxins have been documented, though risk is typically associated with original toxins. However, aerosolized in micrometer submicrometer particles vulnerable atmospheric processing. This processing can potentially degrade produce byproducts varying potencies compared parent The toxins, especially conjunction co-morbid factors such as exposure air pollutants from increased commercial activities ports, may represent a significant pathway considerable portion global population. Understanding chemistry behind transformation these enhance public protection by improving existing alert systems.

Language: Английский

Citations

0
Constructed wetland mesocosms improve the biodegradation of microcystin-LR and cylindrospermopsin by indigenous bacterial consortia DOI

Lasse Ahrenkiel Thyssen,

Pedro Martinez i Quer,

Carlos A. Arias

et al.

SSRN Electronic Journal, Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 1, 2023

Cyanobacterial blooms releasing harmful cyanotoxins, such as microcystin (MC) and cylindrosper-mopsin (CYN), are prominent threats to human animal health. Constructed wetlands (CW) may be a nature-based solution for bioremediation of lake surface water containing due its low-cost requirement infrastructure environmentally friendly operation. There is recent evi-dence that microcystin-LR (MC-LR) can efficiently removed in CW microcosms where CYN deg-radation unknown. Likewise, the mechanistic background regarding cyanotoxins transfor-mation not yet elucidated. In present study, objective was compare MC-LR degradation efficiencies by two similar microbial communities obtained from mesocosms, different experiments setup: 1) vitro batch experiment serum bottles with an introduced community, 2) mesocosms. were spiked at 100 µg L-1 200 spiked. The results showed degraded ≤1 within seven days both experiments, however, markedly higher rate constant mesocosms (0.18 day-1 0.75 day-1, respectively). No removal detected incubations, whereas around 50% re-moved community responded cyanotoxin treatment, most increase bacteria affiliated Methylophilaceae (order: Methylophilales, phylum: Proteobacteria). strongly indicate CWs develop ac-tive capable efficient CYN. However, opera-tional conditions need optimized achieve full degradation. To best our knowledge, this study first report ability degrade

Language: Английский

Citations

1