Ecological impacts of freshwater algal blooms on water quality, plankton biodiversity, structure, and ecosystem functioning

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 758, P. 143605 - 143605

Published: Nov. 17, 2020

Language: Английский

---

Emerging micropollutants in aquatic ecosystems and nanotechnology-based removal alternatives: A review

Chemosphere, Journal Year: 2023, Volume and Issue: 341, P. 139945 - 139945

Published: Aug. 28, 2023

Language: Английский

---

Cyanobacteria and Cyanotoxins in a Changing Environment: Concepts, Controversies, Challenges

Water, Journal Year: 2021, Volume and Issue: 13(18), P. 2463 - 2463

Published: Sept. 7, 2021

Concern is widely being published that the occurrence of toxic cyanobacteria increasing in consequence climate change and eutrophication, substantially threatening human health. Here, we review evidence pertinent publications to explore which types waterbodies likely exacerbate cyanobacterial blooms; whether controlling blooms toxin concentrations requires a balanced approach reducing not only phosphorus (P) but also those nitrogen (N); how trophic climatic changes affect health risks caused by cyanobacteria. We propose following for further discussion: (i) Climate promote some waterbodies—not with low P or N stringently limiting biomass, more so shallow than stratified waterbodies. Particularly latter, it can work both ways—rendering conditions proliferation favourable less favourable. (ii) While emissions environment need be reduced number reasons, definitely successful P, provided brought down levels sufficiently limit biomass. Not N:P ratio, absolute concentration nutrient determines maximum possible biomass phytoplankton thus The show two nutrients currently choice reduce if achieving has chances success. (iii) Where cause longer, stronger frequent blooms, they increase exposure, depend on amount exceed current WHO cyanotoxin guideline values respective exposure situation. reduces epilimnion, transparency, species composition may shift reside benthic surfaces metalimnion, changing exposure. conclude studying environmental genotype populations relatively new exciting research field, holding promises understanding biological function wide range metabolites found cyanobacteria, small fraction humans. Overall, management needs case-by-case assessments focusing impacts waterbody, rather generalisations.

Language: Английский

---

A critical review on operation and performance of source water control strategies for cyanobacterial blooms: Part II-mechanical and biological control methods

Harmful Algae, Journal Year: 2021, Volume and Issue: 109, P. 102119 - 102119

Published: Oct. 22, 2021

This review summarizes current knowledge on mechanical (artificial mixing, hypolimnetic aeration, dredging, and sonication) biological (biomanipulation, macrophytes, straws) methods for the management of cyanobacterial blooms in drinking water sources. Emphasis has been given to (i) mechanism control, (ii) successful unsuccessful case studies, (iii) factors influencing implementation. Most control strategies offer long-term control. However, their application can be cost-prohibitive treatment efficacy is influenced by source geometry continual nutrient inputs from external When artificial mixing oxygenation units are optimized based characteristics, observed quality benefits included increased dissolved oxygen contents, reduced internal loading nutrients, lower concentrations ions . Treatment during aeration was derailed excessive sedimentation organic matter sediment characteristics such as low Fe/P ratios. Dredging beneficial contaminated removal, but it too costly a practical bloom strategy most systems. Sonication have contradictory findings requiring further research evaluate applicability field-scale cyanobacteria. Biological biomanipulation benefits; however, investigations mechanisms still limited, particularly with use macrophytes straws. Each method site-specific strengths, limitations, ecological impacts. Reduction should significant focus restoration efforts were commonly offset continued inputs.

Language: Английский

---

Anabaenopeptins: What We Know So Far

Toxins, Journal Year: 2021, Volume and Issue: 13(8), P. 522 - 522

Published: July 27, 2021

Cyanobacteria are microorganisms with photosynthetic mechanisms capable of colonizing several distinct environments worldwide. They can produce a vast spectrum bioactive compounds different properties, resulting in an improved adaptative capacity. Their richness secondary metabolites is related to their unique and diverse metabolic apparatus, such as Non-Ribosomal Peptide Synthetases (NRPSs). One important class peptides produced by the non-ribosomal pathway anabaenopeptins. These cyclic hexapeptides demonstrated inhibitory activity towards phosphatases proteases, which could be toxicity adaptiveness against zooplankters crustaceans. Thus, this review aims identify key features anabaenopeptins, including diversity structure, occurrence, biosynthetic steps for production, ecological roles, biotechnological applications.

Language: Английский

---

Coagulation as an effective method for cyanobacterial bloom control: A review

Water Environment Research, Journal Year: 2024, Volume and Issue: 96(3)

Published: Feb. 25, 2024

Eutrophication, the over-enrichment with nutrients, for example, nitrogen and phosphorus, of ponds, reservoirs lakes, is an urgent water quality issue. The most notorious symptom eutrophication a massive proliferation cyanobacteria, which cause aquatic organism death, impair ecosystem harm human health. method considered to be effective counteract reduce external nutrient inputs. However, merely controlling load insufficient mitigate eutrophication. Consequently, rapid diminishing cyanobacterial blooms relied on in-lake intervention, may encompass great variety different approaches. Coagulation/flocculation used important purification unit. Since cells generally carry negative charges, coagulants are added neutralize charges surface causing them destabilize precipitate. Most cyanobacteria their metabolites can removed simultaneously. when density high, sticky secretions distribute outside because small size cyanobacteria. easily form complex colloids coagulants, making it difficult resulting in unsatisfactory treatment effects coagulation Therefore, various methods were developed. In this paper, focus as promising tool manage Basic principles, applications, pros cons chemical, physical biological reviewed. addition, application discussed. It aim review article provide significant reference large-scale governance blooms. PRACTITIONER POINTS: Flocculation was principles four kinds flocculation elucidated. Flocculant process.

Language: Английский

---

Modeling cyanobacterial blooms in tropical reservoirs: The role of physicochemical variables and trophic interactions

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 744, P. 140659 - 140659

Published: July 2, 2020

Language: Английский

---

Impact of cyanobacterial bloom intensity on plankton ecosystem functioning measured by eukaryotic phytoplankton and zooplankton indicators

Ecological Indicators, Journal Year: 2022, Volume and Issue: 140, P. 109028 - 109028

Published: June 6, 2022

Cyanobacterial blooms are global threats to freshwater ecosystem functioning, human health, and ecoservices. We assessed impacts of cyanobacterial bloom intensity on plankton functioning using eukaryotic phytoplankton zooplankton indicators associated key physicochemical data collected from four seasons two years at 24 evenly distributed sites in Lake Taihu that has year-around blooms. Our analyses involved comparison site-groups with different intensities analyzing all sampling together comparison, hierarchical partitioning analysis, generalized additive mixed model, structural equation model. found abundance positively TP temperature (negatively TN:TP), while TN. There was an inverse relation trend between relative abundances cyanobacteria, but there no clear absolute cyanobacteria. Rotifers were most dominant when cyanobacteria unabundant, cladocerans presented higher high abundance. Phytoplankton functional richness species negatively intensity. resource use efficiencies (RUEs) rotifers, RUE cladocerans. analytical approach integrating uncovered how shifted altered biological conditions identified the mechanism strength interactive linkages among indicators. Although our results may be oligotrophic lakes or reservoirs, findings provide new insights understanding dynamics communities for polymictic eutrophic lakes, which have broad application enhancing knowledge this subject provides science base managing lake water quality functioning.

Language: Английский

---

Cyanobacteria respond to trophic status in shallow aquatic ecosystems

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 174932 - 174932

Published: July 27, 2024

Small and shallow water bodies are particularly sensitive to adverse conditions connected with anthropogenic eutrophication. As model systems, ponds a good object for ecological research monitoring of global environmental changes. We examined cyanobacteria along other groups algae versus zooplankton abiotic characteristics in 51 aquatic ecosystems exposed pressure (from natural forest highly disturbed field ponds) 3 distinct trophic groups: meso-, eu- hypertrophic. This study aimed define how different levels trophy affect pond-specific assemblages identify species responding particular states. demonstrated that type determined the occurrence certain species. From among 78 identified taxa, shade- turbid mixed adapted were most numerous. Eutrophic had highest diversity abundance zooplankon. Dominating such as Chroococcus minimus, Anagnostidinema amphibium, Phormidium granulatum or Komvophoron minutum preferred mesotrophic, while e.g. Jaaginema subtilissimum, Limnolyngbya circumcreta, Limnothrix vacuolifera Romeria leopolienis eutrophic waters these not grazed by filtrators. Only (Aphanizomenon flos-aquae, Dolichospermum circinale, Planktothrix agardhii) associated hypertrophic ponds. Therefore, we assume taxa have high indicative potential distinguish between Reynolds Functional Groups also exhibit responses changes quality. It was partucularly evident case representatives codon M which attributed Advancing our understanding about preferences is crucial, especially era warming persistent issue eutrophication, when problems harmful cyanobacterial blooms intensifying. The findings significance management implications, highlighting often-overlooked importance pond maintaining overall

Language: Английский

---

Introducing a zooplanktonic index for assessing water quality of natural lakes in the Mediterranean region

Ecological Informatics, Journal Year: 2022, Volume and Issue: 69, P. 101616 - 101616

Published: March 4, 2022

Language: Английский

---