Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada DOI
Hans W. Paerl, Justin D. Chaffin,

J. M. Cheshire

и другие.

Limnology and Oceanography, Год журнала: 2024, Номер 69(12), С. 2913 - 2928

Опубликована: Ноя. 1, 2024

Lake Erie, USA-Canada, plays an important ecological and socioeconomic role but has suffered from chronic eutrophication. In particular, Western Erie (WLE) is the site of harmful algal blooms (HABs) which are suspected being driven by excessive nutrient (phosphorus (P) nitrogen (N)) inputs. During 2022 2023, in-situ dilution addition bioassays were conducted at a WLE bloom-impacted location to investigate whether reduction regime would be effective in limiting phytoplankton growth during June diatom-dominated spring August cyanobacteria-dominated summer blooms. The primary objectives this experiment 1) Determine if proposed 40% P-alone effectively reduce mitigate 2) assess reductions both P N more controlling biomass than exclusive either or P. Samples analyzed for concentrations rate responses specific groups utilizing diagnostic (for major groups) photopigments. Results indicated that although 20% dilutions led lower rates, effective. Our results support USA-Canada Great Lakes Water Quality Agreement recommendation reduction, also indicate parallel input most bloom magnitudes. Overall, our findings underscore year-round dual needed long-term control eutrophication blooms, including HABs diatoms, Erie.

Язык: Английский

Highly Efficient Adsorption of Emerging Freshwater Saxitoxins with Graphene DOI Creative Commons
Jesse L. Roberts,

Justin Puhnaty,

A Evans

и другие.

ACS ES&T Water, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

The rapid proliferation of saxitoxin (STX)-producing cyanobacteria in freshwater ecosystems poses an emerging threat to global drinking water security. STXs (STX), produced by these harmful algal blooms, are a class potent neurotoxic alkaloids that exhibit resistance conventional treatment processes like oxidation. Adsorption using carbon-based materials is recommended for STX removal, but current adsorbents have limited efficacy. Here, we demonstrate mesoporous graphene nanoplatelets (GnPs) superior adsorbent STX, outperforming granular activated carbon (GAC) and other benchmarks both kinetics capacity. GnPs achieved 93.5-fold higher adsorption capacity over 6-fold faster compared GAC. exceptional performance attributed their high surface area, favorable chemistry, optimized pore structure facilitate extensive through π–π interactions, electrostatic attraction, intraparticle diffusion. Mechanistic studies revealed critical role solution conditions, with pH lower ionic strength enhancing removal promoting interactions. also demonstrated excellent simulated field water, maintaining >90% within 1 h even the presence competitive organics. This study highlights immense potential as advanced mitigating rising contamination water.

Язык: Английский

Процитировано

2
Health and Environmental Impacts of Cyanobacteria and Cyanotoxins from Freshwater to Seawater DOI Creative Commons

Tamara Villalobos,

Benjamín A. Suárez‐Isla,

Carlos Garcı́a

и другие.

Toxins, Год журнала: 2025, Номер 17(3), С. 126 - 126

Опубликована: Март 7, 2025

Cyanobacterial harmful algal blooms (cyanoHABs) are a natural phenomenon produced mainly by the interaction between and anthropogenic events. CyanoHABs characterized production of cyanotoxins that can have effects on different species within food web even affect human health. Among most prevalent toxin groups worldwide microcystins (MCs), anatoxins (ATXs), cylindrospermopsins (CYNs) nodularins (NODs), which as toxins with hepatotoxic, neurotoxic, cytotoxic effects. This review summarizes analyzes research influence cyanoHABs, main toxin-producing cyanobacteria in freshwater marine bodies, highlighting their global occurrence, toxicology, bioaccumulation dynamics vectors web, cases acute chronic intoxications humans. is useful for understanding cyanoHABs’ ecosystem impact health, how implementation surveillance management framework could generate vital information stakeholders to establish health guidelines risks hazards cyanoHABs

Язык: Английский

Процитировано

0
Genomic Identification and Characterization of Saxitoxin Producing Cyanobacteria in Western Lake Erie Harmful Algal Blooms DOI
Paul A. Den Uyl, E. Anders Kiledal, Reagan M. Errera

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 10, 2025

Saxitoxins (STXs), a group of closely related neurotoxins, are among the most potent natural toxins known. While genes encoding STX biosynthesis have been observed in Lake Erie, organism(s) responsible for producing STXs Laurentian Great Lakes not identified. We identified full suite Dolichospermum metagenome-assembled genome (MAG). The content sxt suggest that this organism can produce STX, decarbamoyl and deoxy-decarbamoyl saxitoxins, other congeners. absence sxtX indicates is unable to neosaxitoxin, congener. However, distinct, lower abundance operon from an unidentified did contain sxtX, indicating neosaxitoxin potential. Metatranscriptomic data confirmed gene expression. also recovered highly similar MAGs lacking genes, implying loss or horizontal transfer. sxtA was detected by quantitative polymerase chain reaction during 47 76 sampling dates between 2015 2019, demonstrating higher sensitivity than metagenomic approaches. positively correlated with temperature particulate nitrogen:phosphorus ratio negatively ammonium concentration. All had required nitrogen fixation. Collectively, study provides foundation understanding potential new threats Erie water quality.

Язык: Английский

Процитировано

0
Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada DOI
Hans W. Paerl, Justin D. Chaffin,

J. M. Cheshire

и другие.

Limnology and Oceanography, Год журнала: 2024, Номер 69(12), С. 2913 - 2928

Опубликована: Ноя. 1, 2024

Lake Erie, USA-Canada, plays an important ecological and socioeconomic role but has suffered from chronic eutrophication. In particular, Western Erie (WLE) is the site of harmful algal blooms (HABs) which are suspected being driven by excessive nutrient (phosphorus (P) nitrogen (N)) inputs. During 2022 2023, in-situ dilution addition bioassays were conducted at a WLE bloom-impacted location to investigate whether reduction regime would be effective in limiting phytoplankton growth during June diatom-dominated spring August cyanobacteria-dominated summer blooms. The primary objectives this experiment 1) Determine if proposed 40% P-alone effectively reduce mitigate 2) assess reductions both P N more controlling biomass than exclusive either or P. Samples analyzed for concentrations rate responses specific groups utilizing diagnostic (for major groups) photopigments. Results indicated that although 20% dilutions led lower rates, effective. Our results support USA-Canada Great Lakes Water Quality Agreement recommendation reduction, also indicate parallel input most bloom magnitudes. Overall, our findings underscore year-round dual needed long-term control eutrophication blooms, including HABs diatoms, Erie.

Язык: Английский

Процитировано

1