Characteristics of Cyanobacteria at Different Stages of Existence of the Kyiv Reservoir

Hydrobiological Journal, Год журнала: 2023, Номер 60(1), С. 3 - 27

Опубликована: Дек. 8, 2023

The paper deals with the patterns of Cyanobacteria long-term succession at different stages existence Kyiv Reservoir. main ecological factors responsible for include current velocity, hydromorphological characteristics reservoir, content inorganic nitrogen (primarily ammonium) and phosphorus, ΣN : P ratio, global climate changes, competition higher aquatic plants in shallow water zone. trophic state hydroecosystem changed from mesotrophic (at stage non-regulated river) to eutrophic present time) depending on intensity development. With possible further deterioration quality, changes an increase temperature within range even 1-2°C, development will increase, especially pelagic zone where they have practically no natural biological competitors.

Язык: Английский

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Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences

Ecological Indicators, Год журнала: 2021, Номер 124, С. 107421 - 107421

Опубликована: Янв. 27, 2021

Globally, the establishment of protected reserves contributes positively to species protection but also presents a real threat unexpected changes. A few reports showed that progressively increasing number roosting and breeding cormorants across Europe was associated with food-rich water bodies. Our studies concerned detailed novel research on annual cyanobacterial growth against other ecological factors, is, biotic (ciliates, rotifers, cladocerans, copepods) abiotic (temperature, nutrients) in lake where piscivorous great evidently affects quality. Mass development cyanobacteria lasted throughout whole ice-free months (March–December). However, under-ice period they formed relatively high biomass, suggesting an persistence. The potentially toxic filamentous Pseudanabaena, Aphanizomenon, Planktothrix, Limnothrix were constant dominants cyanobacteria-dominated phytoplankton almost year round. Water temperature played major role stimulating cyanobacteria. nitrogen, phosphorus, even some zooplankters significantly related very low trophic efficiency suggested reduced energy flow at lower food-web level starting from dominant results suggest numerous colonies cormorant contributed bottom-up (nutrients) top-down (predation fish) controls consequently formation site-specific refuge for This functioning ecosystem by disturbing classical food webs, which is important management warming-induced global problems dominance

Язык: Английский

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Is Toxin-Producing Planktothrix sp. an Emerging Species in Lake Constance?

Toxins, Год журнала: 2021, Номер 13(9), С. 666 - 666

Опубликована: Сен. 17, 2021

Recurring blooms of filamentous, red-pigmented and toxin-producing cyanobacteria Planktothrix rubescens have been reported in numerous deep stratified prealpine lakes, with the exception Lake Constance. In a 2019 2020 Constance field campaign, we collected samples from distinct biomass maximum below chlorophyll-a maximum, which was determined using fluorescence probe measurements at depths between 18 20 m. Here, report characterization these water red pigment maxima (DRM) as cyanobacterial blooms. Using 16S rRNA gene-amplicon sequencing, found evidence that were, indeed, contributed by spp., although phycoerythrin-rich Synechococcus taxa constituted most (>96% relative read abundance) DRM community. Through UPLC-MS/MS, also detected toxic microcystins (MCs) individual sampling days concentrations ≤1.5 ng/L. Subsequently, reevaluated over past decade that, summer, present Constance, least since 2009. Our study highlights need for continuous monitoring program targeting future studies on competition different taxa. Future will address potential community composition changes response to climate change driven physiochemical biological parameters lake.

Язык: Английский

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Microcystin as a biogeochemical cycle: Pools, fluxes, and fates of the cyanotoxin in inland waters

Limnology and Oceanography Letters, Год журнала: 2022, Номер 8(3), С. 406 - 418

Опубликована: Дек. 22, 2022

Abstract Microcystin poses a serious threat to aquatic ecosystems and human health. There is pressing need understand the production, movement, storage of microcystin in lakes. We constructed conceptual biogeochemical model for through comprehensive literature synthesis, identifying four major pools nine fluxes lakes that also connect terrestrial environment. This can be used as framework developing ecosystem mass balances microcystin. propose concentration water column balance between import, sediment translocation, production degradation, uptake, burial, export. However, substantial unknowns remain pertaining magnitude movement Future investigations should focus on fluxes, drivers biodegradation, seasonal dynamics. Adopting “microcystin cycle” improves our understanding processes driving toxin prevalence helps prioritize strategies minimizing exposure risks.

Язык: Английский

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Biodegradation of microcystin using free and alginate-immobilized Stenotrophomonas geniculate DMC-X3 bacterium

Environmental Technology & Innovation, Год журнала: 2023, Номер 32, С. 103440 - 103440

Опубликована: Ноя. 1, 2023

The eutrophication of water bodies and global warming have led to frequent cyanobacterial blooms, producing large quantities algal toxins, which are released into bodies, posing a threat human health. Among known microcystin (MC) is the most harmful commonly detected. Because its stable chemical structure, it difficult degrade MC though physical methods. Hence, effectively removing from ensuring safety become urgent issues. In this study, strain DMC-X3, could rapidly efficiently MC, was isolated reservoir affected by Microcystis aeruginosa bloom identified as Stenotrophomonas geniculate. Inoculated at OD600=0.1, DMC-X3 degraded 70% 1000 μg/L in 24 h, over 90% within 48 h. When inoculation density increased OD600=0.35, bacterial completely 16 h 5000 96 maintained degradation ability under environmental conditions pH 5–11 15–35°C. After 60 d storage room temperature, embedded immobilized on sodium alginate pellets showed 200 be used for least three cycles. Sustained-release made embedding immobilizing both bacteria algicidal substance prodigiosin eradicated M. cells promising good application prospect controlling blooms.

Язык: Английский

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