Summer changes in cyanobacterial bloom composition and microcystin concentration in eutrophic Czech reservoirs

2006 ◽  
Vol 21 (3) ◽  
pp. 236-243 ◽  
Author(s):  
Petr Znachor ◽  
Tomasz Jurczak ◽  
Jaroslava Komárková ◽  
Jitka Jezberová ◽  
Joanna Mankiewicz ◽  
...  
Keyword(s):  
Cyanobacterial Bloom ◽  
Microcystin Concentration

scholarly journals Microcystin Biosynthesis andmcyAExpression in Geographically DistinctMicrocystisStrains under Different Nitrogen, Phosphorus, and Boron Regimes

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Ankita Srivastava ◽  
So-Ra Ko ◽  
Chi-Yong Ahn ◽  
Hee-Mock Oh ◽  
Alok Kumar Ravi ◽  
...  
Keyword(s):  
South Korea ◽  
Environmental Variables ◽  
Reference Strain ◽  
Heterotrophic Bacteria ◽  
Cyanobacterial Bloom ◽  
Photoautotrophic Growth ◽  
Microcystin Concentration ◽  
Alpha Beta ◽  
Nitrogen Phosphorus

Roles of nutrients and other environmental variables in development of cyanobacterial bloom and its toxicity are complex and not well understood. We have monitored the photoautotrophic growth, total microcystin concentration, and microcystins synthetase gene (mcyA) expression in lab-grown strains ofMicrocystisNIES 843 (reference strain), KW (Wangsong Reservoir, South Korea), and Durgakund (Varanasi, India) under different nutrient regimes (nitrogen, phosphorus, and boron). Higher level of nitrogen and boron resulted in increased growth (avg. 5 and 6.5 Chlamg/L, resp.), total microcystin concentrations (avg. 1.185 and 7.153 mg/L, resp.), andmcyAtranscript but its expression was not directly correlated with total microcystin concentrations in the target strains. Interestingly, Durgakund strain had much lower microcystin content and lacked microcystin-YR variant over NIES 843 and KW. It is inferred that microcystin concentration and its variants are strain specific. We have also examined the heterotrophic bacteria associated with cyanobacterial bloom in Durgakund Pond and Wangsong Reservoir which were found to be enriched in Alpha-, Beta-, and Gammaproteobacteria and that could influence the bloom dynamics.

scholarly journals Metagenomic study to evaluate functional capacity of a cyanobacterial bloom during oxidation

2021 ◽  
pp. 100151
Author(s):  
Saber Moradinejad ◽  
Hana Trigui ◽  
Juan Francisco Guerra Maldonado ◽  
B. Jesse Shapiro ◽  
Yves Terrat ◽  
...  
Keyword(s):  
Functional Capacity ◽  
Cyanobacterial Bloom ◽  
Metagenomic Study

scholarly journals Occurrence of a single-species cyanobacterial bloom in a lake in Cyprus: monitoring and treatment with hydrogen peroxide-releasing granules

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Eleni Keliri ◽  
Christia Paraskeva ◽  
Angelos Sofokleous ◽  
Assaf Sukenik ◽  
Dariusz Dziga ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Animal Health ◽  
Cyanobacterial Bloom ◽  
Single Species ◽  
Eutrophic Lake ◽  
Liquid Hydrogen ◽  
Bioactive Metabolites ◽  
Forest Park

AbstractBackgroundExcess loads of nutrients finding their way into waterbodies can cause rapid and excessive growth of phytoplankton species and lead to the formation of cyanobacterial harmful algal blooms (cyano-HABs). Toxic cyanobacteria produce a broad range of bioactive metabolites, some of which are known as cyanotoxins. These metabolites can negatively impact the ecosystem, and human and animal health, thus their presence needs to be closely monitored and mitigated. This study aimed to monitor St. George Lake (Athalassa National Forest Park, Cyprus) for its water quality characteristics, and initiate a new methodology to control the bloom that occurred in the lake during summer 2019, by comparing hydrogen peroxide treatment with novel metallic peroxide granules as source of hydrogen peroxide.ResultsLake monitoring showed that pH, salinity, total dissolved solids and conductivity varied throughout the year, and nutrients concentration was high, indicating a eutrophic lake. The cyanobacteriumMerismopediasp. bloomed in the lake between June and September 2019, comprising up to 99% of the phytoplankton biovolume. The presence of microcystin synthase encoding gene (mcyB, mcyE) was documented, however microcystins were not detected by tandem mass spectroscopy. Treatment with liquid hydrogen peroxide in concentrations 1 to 5 mg L−1had no effect on the phycocyanin fluorescence (Ft) and quantum yield of PSII (Fv/Fm) indicating an ineffective treatment for the denseMerismopediabloom (1 million cells mL−1 ± 20%). Metallic peroxide granules tested for their H2O2releasing capacity in St. George Lake water, showing that CaO2released higher H2O2concentration and therefore have better mitigation efficiency than MgO2granules.ConclusionThe present study highlights the importance of monitoring several water parameters to conclude on the different actions to be taken to limit eutrophication in the catchment area. The findings demonstrated that testing for the presence of genes involved in cyanotoxin production may not be sufficient to follow cyanotoxins in the water, therefore it should be accompanied with analytical confirmation. Treatment experiments indicated that slow release of H2O2from peroxide granules may be an alternative to liquid hydrogen peroxide when applied in appropriate doses, but further investigation is needed before it is applied at the field.Graphic Abstract

Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

2021 ◽  
Vol 66 (4) ◽  
pp. 1492-1509
Author(s):  
Hai Xu ◽  
Mark J. McCarthy ◽  
Hans W. Paerl ◽  
Justin D. Brookes ◽  
Guangwei Zhu ◽  
...  
Keyword(s):  
Nutrient Loading ◽  
Nutrient Management ◽  
Lake Taihu ◽  
Cyanobacterial Bloom ◽  
External Nutrient ◽  
Internal Cycling

scholarly journals Toxic Cyanobacterial Bloom Triggers in Missisquoi Bay, Lake Champlain, as Determined by Next-Generation Sequencing and Quantitative PCR

Life ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1346-1380 ◽  
Author(s):  
Nathalie Fortin ◽  
Valentina Munoz-Ramos ◽  
David Bird ◽  
Benoît Lévesque ◽  
Lyle Whyte ◽  
...  
Keyword(s):  
Next Generation Sequencing ◽  
Quantitative Pcr ◽  
Cyanobacterial Bloom ◽  
Next Generation ◽  
Lake Champlain ◽  
Generation Sequencing

Impact of cyanobacterial bloom on microbiomes of freshwater lakes

2021 ◽  
Vol 46 (4) ◽  
Author(s):  
Mili Pal ◽  
Shailendra Yadav ◽  
Atya Kapley ◽  
Asifa Qureshi
Keyword(s):  
Cyanobacterial Bloom ◽  
Freshwater Lakes

Biological control of cyanobacterial bloom by leaf biomass

2021 ◽  
Vol 219 ◽  
pp. 157-163
Author(s):  
Zarina Zainuddin ◽  
Japareng Lalung ◽  
Tengku Nadiah Yusof ◽  
Mohd. Rafatullah ◽  
Norli Ismail
Keyword(s):  
Biological Control ◽  
Cyanobacterial Bloom ◽  
Leaf Biomass

Dynamics of the prokaryotic and eukaryotic microbial community during a cyanobacterial bloom

2021 ◽  
Author(s):  
Yilin Qian ◽  
Kunihiro Okano ◽  
Miwa Kodato ◽  
Michiko Arai ◽  
Takeru Yanagiya ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Negative Correlation ◽  
Aquatic Environment ◽  
Cyanobacterial Bloom ◽  
Cyanobacterial Blooms ◽  
Gene Copy ◽  
Degrading Bacteria ◽  
Freshwater Bodies ◽  
Predator Community

Abstract Toxic cyanobacterial blooms frequently develop in eutrophic freshwater bodies worldwide. Microcystis species produce microcystins (MCs) as a cyanotoxin. Certain bacteria that harbor the mlr gene cluster, especially mlrA, are capable of degrading MCs. However, MCs-degrading bacteria may possess or lack mlr genes (mlr+ and mlr− genotypes, respectively). In this study we investigated the genotype that predominantly contributes to biodegradation and cyanobacterial predator community structure with change in total MCs concentration in an aquatic environment. The two genotypes co-existed but mlr+ predominated, as indicated by the negative correlation between mlrA gene copy abundance and total MCs concentration. At the highest MCs concentrations, predation pressure by Phyllopoda, Copepoda, and Monogononta (rotifers) was reduced; thus, MCs may be toxic to cyanobacterial predators. The results suggest cooperation between MCs-degrading bacteria and predators may reduce Microcystis abundance and MCs concentration.

scholarly journals Harmful phytoplankton blooms and fish mortality in a eutrophicated reservoir of northeast Brazil

2008 ◽  
Vol 51 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Naithirithi Tiruvenkatachary Chellappa ◽  
Sarah Laxhmi Chellappa ◽  
Sathyabama Chellappa
Keyword(s):  
Cyanobacterial Bloom ◽  
Hplc Method ◽  
Freshwater Ecosystems ◽  
Cyanobacterial Blooms ◽  
Fish Mortality ◽  
Cylindrospermopsis Raciborskii ◽  
Northeast Brazil ◽  
Cyanobacterial Toxin ◽  
Bloom Formation ◽  
Harmful Effects

The aim of this work was to study the eutrophication in the tropical freshwater ecosystems and the consequent cyanobacterial bloom formation and economical damage to fisheries and harmful effects to public health. Mass fish mortality due to toxin producing cyanobacterial blooms was registered during December 2003 in Marechal Dutra Reservoir, Acari/RN, Northeast Brazil. Phytoplankton and fish samplings were carried out on alternate days during the episode of fish mortality and monthly during January to June 2004. The cyanobacterial toxin was identified and quantified from the seston samples and liver of the dead fishes using the standard HPLC method. The results indicated that the toxic blooms of Cylindrospermopsis raciborskii and Microcystis aeruginosa were persistent for two weeks and represented 90% of the phytoplankton species assemblages. The lethally affected fishes were Oreochromis niloticus, Plagioscion squamosissimus, Cichla monoculus, Prochilodus brevis, Hoplias malabaricus and Leporinus friderici. The microcystin levels varied from 0.07 to 8.73µg L-1 the seston samples and from 0.01 to 2.59µg g-1in the liver samples of the fishes during the bloom period.

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