The Effects of Disinfection Byproduct 2,6-Dichloro-1,4-benzoquinone on the Cyanobacterium Microcystis aeruginosa: From the Perspectives of Biochemistry and Non-Targeted Metabolomics

Toxics, Journal Year: 2025, Volume and Issue: 13(1), P. 64 - 64

Published: Jan. 17, 2025

2,6-Dichloro-1,4-benzoquinone (2,6-DCBQ) is an emerging chlorinated disinfection byproduct (DBP) in bodies of water. However, this compound poses unknown toxic effect on cyanobacteria. In study, the toxicological mechanisms 2,6-DCBQ Microcystis aeruginosa (M. aeruginosa) were investigated through physiological and nontargeted metabolomic assessments. The results show that inhibited growth M. aeruginosa, reduced its photosynthetic pigment protein contents, increased levels reactive oxygen species, damaged antioxidant defense system, aggravated cytomembrane. Meanwhile, stimulated production release microcystin-LR (MC-LR) altered transcripts genes associated with synthesis (mcyA, mcyD) transport (mcyH). addition, metabolomics cells exposed to 0.1 mg/L identified 208 differential metabolites belonging 10 metabolic pathways revealed considerable interference caused by among ABC transporters, two-component folate biosynthesis. This study deepens understanding responses 2,6-DCBQ, offers insights into provides a theoretical basis for ecological risk assessment DBPs accordance water quality criteria.

Language: Английский

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Impact of long-term cyanotoxin exposure on cattle: Biochemical, histological, and oxidative stress assessment

Veterinary World, Journal Year: 2025, Volume and Issue: unknown, P. 189 - 201

Published: Jan. 1, 2025

Cyanobacterial blooms, driven by anthropogenic and climatic changes, pose significant ecological health threats. This study investigates the long-term effects of microcystins (MCs), potent cyanotoxins, on cattle at Lake des Oiseaux, a Ramsar-listed wetland in Algeria. Aligning with "One Health" framework, research evaluates biochemical, histological, oxidative stress impacts MCs livestock as environmental sentinels. A herd 40 (20 exposed 20 non-exposed) was studied during summer bloom period 2019. Blood liver samples were analyzed to assess biochemical markers (ALT, AST, ALP, GGT, etc.), histopathological parameters (GPx, CAT, SOD, LPO GSH). Exposed exhibited elevations enzymes markers, indicating hepatic inflammation redox imbalance. Histological analysis revealed macrovacuolar steatosis, fibrosis, bile duct dilatation. Antioxidant enzyme activities CAT SOD) reduced, notable depletion GSH levels increased lipid peroxidation. These findings reflect cumulative cytotoxic MC exposure. Non-exposed showed no such changes. Long-term exposure disrupts function induces cattle, implicating risks for both animal human health. The bioaccumulation cyanotoxins emphasizes urgent need preventive measures, including water monitoring, restricted access contaminated sites, farmer education. strategies are vital mitigate under approach, ensuring sustainable public

Language: Английский

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Prechlorination of algae-laden water: the effects of ammonia on chlorinated disinfection byproduct formation during long-distance transportation

Blue-Green Systems, Journal Year: 2025, Volume and Issue: 7(1), P. 30 - 41

Published: Jan. 22, 2025

ABSTRACT Prechlorination can cause algal cell damage and lead to the formation of disinfection byproducts (DBPs). This study investigates impact ammonia (NH4+) concentration on carbon (C-DBPs) nitrogenous (N-DBPs) in algae-laden water during long-distance transportation. It was found that lower chlorine-to-ammonia (Cl2/NH4+) ratios resulted less DBP levels compared higher ratios. Surprisingly, after 360 min transport, C-DBP were consistently samples with a Cl2/NH4+ ratio 1:0 those 1:0.05, despite similar damage. difference is attributed varying release organic matter (AOM) between groups, group releasing more AOM. The presence NH4+ appears play significant role reducing damage, influencing AOM formation. Dissolved carbon, mainly from proteins polysaccharides, primary source C-DBPs absorbed by dead cells, indicating link biomass Therefore, when using prechlorination for treatment, both chlorine dosage transport distance should be adjusted based minimize

Language: Английский

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Dual stable isotopes approach reveals the nitrogen sources, transformations, and effects on phytoplankton community structure in a large floodplain lake

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: Feb. 12, 2025

Abstract Background Anthropogenic activities have led to increased N input and changes of transformation processes in lake systems. However, phytoplankton community structure caused by phytoplankton’s preference for utilization under the increasing remain poorly understood. This study used nitrate isotopes (δ 15 N-NO 3 − δ 18 O-NO ) investigate seasonal differences cycling as well associated response biomass composition. Results showed that average values spring, summer, autumn, winter were 7.6 ± 0.7‰, 6.1 5.5 1.8‰, 7.4 1.2‰, respectively. Accordingly, following order: (12.8 1.0‰) > summer (11.5 0.9‰) spring (10.3 autumn (7.9 1.7‰). The main sources Lake Poyang soil N, fertilizer, manure sewage all seasons, contributing 93.8%, 3.3%, 2.8%, Nitrification algal-derived (NO -N) assimilation biochemical affecting N. In signal nitrification was stronger, while signals algae more pronounced. composition varied with concentrations forms. total lowest four seasons it negatively correlated NO -N concentration ( P < 0.05). Conclusions results this contribute a better understanding role available forms floodplain provide essential support prediction growth functions. Our work deciphers cycle, providing theoretical management future environmental changes.

Language: Английский

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Mapping Harmful Algae Blooms: The Potential of Hyperspectral Imaging Technologies

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(4), P. 608 - 608

Published: Feb. 11, 2025

Harmful algae blooms (HABs) pose critical threats to aquatic ecosystems and human economies, driven by their rapid proliferation, oxygen depletion capacity, toxin release, biodiversity impacts. These blooms, increasingly exacerbated climate change, compromise water quality in both marine freshwater ecosystems, significantly affecting life coastal economies based on fishing tourism while also posing serious risks inland bodies. This article examines the role of hyperspectral imaging (HSI) monitoring HABs. HSI, with its superior spectral resolution, enables precise classification mapping diverse species, emerging as a pivotal tool environmental surveillance. An array HSI techniques, algorithms, deployment platforms are evaluated, analyzing efficacy across varied geographical contexts. Notably, sensor-based studies achieved up 90% accuracy, regression-based chlorophyll-a (Chl-a) estimations frequently reaching coefficients determination (R2) above 0.80. quantitative findings underscore potential for robust HAB diagnostics early warning systems. Furthermore, we explore current limitations future management, highlighting strategic importance addressing growing economic challenges posed paper seeks provide comprehensive insight into HSI’s capabilities, fostering integration global strategies against proliferation.

Language: Английский

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