Daphnia and Toxic Blooms of Microcystis aeruginosa in Bautzen Reservoir (GDR)

1989 ◽  
Vol 74 (3) ◽  
pp. 233-248 ◽  
Author(s):  
Jürgen Benndorf ◽  
Manfred Henning
Keyword(s):  
Microcystis Aeruginosa ◽  
Toxic Blooms

scholarly journals Cianobactérias e Toxicidade: Impacte na Saúde Pública em Portugal e no Brasil (Cyanobateria and Toxicity: Public Health Impact in Portugal and Brazil)

2013 ◽  
Vol 5 (6) ◽  
pp. 1374
Author(s):  
Fernando Bellém ◽  
Susana Nunes ◽  
Manuela Morais ◽  
Rita Fonseca
Keyword(s):  
Public Health ◽  
Microcystis Aeruginosa ◽  
Health Impact ◽  
Acute Poisoning ◽  
Minas Gerais ◽  
Mitigation Measures ◽  
Public Health Impact ◽  
Cyanobacteria Bloom ◽  
Cyanobacteria Blooms ◽  
Toxic Blooms

Um aumento da concentração de nutrientes na água poderá desencadear fluorescências de cianobactérias (densidades >200 cel/mL). Sob determinadas condições as cianobactérias produzem toxinas responsáveis pelo envenenamento de animais e humanos. O objetivo deste estudo é relacionar a ocorrência de fluorescências toxicas em Portugal e no Brasil. Para tal, em 2005 e 2006 foi estudado o fitoplâncton em três reservatórios em Portugal (região sul) e dois no Brasil (Minas Gerais e Pará). Comparativamente foi verificado maior diversidade nos reservatórios portugueses, com dominância de cianobactérias em período de primavera/verão/outono, pertencentes a géneros produtores de hépato e neurotoxinas (Microcystis sp, Aphanizomenon sp, Oscillatoria sp e Planktothrix sp.). No Brasil observou-se dominância de cianobactérias ao longo de todo o ano, com presença de Microcystis aeruginosa, produtora de hepatotoxina. Conclui-se que os reservatórios estudados apresentam géneros produtores de toxinas, com risco para a saúde pública, sendo fundamental implementar medidas que contribuam para mitigar esta situação. Palavras-chave: cianobactérias; fluorescências; toxinas; saúde pública  Cyanobateria and Toxicity: Public Health Impact in Portugal and Brazil  ABSTRACT An increasing of nutrients in water can conduct to the development of cyanobacteria blooms (density>2000 cels/mL). Under specific conditions cyanobacteria produce toxins responsible for acute poisoning of animals and humans. The aim of this study is to describe toxic blooms in Portugal and Brazil. Therefore, phytoplankton from three Portuguese reservoirs (South region) and two from Brazil (Minas Gerais and Pará) were studied in 2005 and 2006. Portuguese reservoirs showed more diversity with dominance of hepatic and neurotoxin genera producers (Microcystis sp, Aphanizomenon sp, Oscillatoria sp e Planktothrix sp.) along spring/summer/autumn seasons. In Brazil dominance of cyanobacteria was observed all along the year with the presence of Microcystis aeruginosa hepatotoxic producer. The studied reservoirs present toxins producers’ genera, with risk for public health, being fundamental the implementation of mitigation measures to reverse this situation.Keywords: cyanobacteria; bloom; toxins; public health

scholarly journals Occurrence of toxic blooms of Microcystis aeruginosa in a central Chilean (36° Lat. S) urban lake

2016 ◽  
Vol 89 (1) ◽  
Author(s):  
Viviana Almanza ◽  
Oscar Parra ◽  
Carlos E. De M. Bicudo ◽  
Carolina Baeza ◽  
Johana Beltran ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Urban Lake ◽  
Toxic Blooms

scholarly journals Ma-LMM01 Infecting Toxic Microcystis aeruginosa Illuminates Diverse Cyanophage Genome Strategies

2007 ◽  
Vol 190 (5) ◽  
pp. 1762-1772 ◽  
Author(s):  
Takashi Yoshida ◽  
Keizo Nagasaki ◽  
Yukari Takashima ◽  
Yoko Shirai ◽  
Yuji Tomaru ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Surface Waters ◽  
Lytic Phage ◽  
Trna Genes ◽  
Protein Coding ◽  
Light Harvesting Complex ◽  
Photosynthetic Genes ◽  
Genome Study ◽  
Toxic Blooms ◽  
A Site

ABSTRACT Cyanobacteria and their phages are significant microbial components of the freshwater and marine environments. We identified a lytic phage, Ma-LMM01, infecting Microcystis aeruginosa, a cyanobacterium that forms toxic blooms on the surfaces of freshwater lakes. Here, we describe the first sequenced freshwater cyanomyovirus genome of Ma-LMM01. The linear, circularly permuted, and terminally redundant genome has 162,109 bp and contains 184 predicted protein-coding genes and two tRNA genes. The genome exhibits no colinearity with previously sequenced genomes of cyanomyoviruses or other Myoviridae. The majority of the predicted genes have no detectable homologues in the databases. These findings indicate that Ma-LMM01 is a member of a new lineage of the Myoviridae family. The genome lacks homologues for the photosynthetic genes that are prevalent in marine cyanophages. However, it has a homologue of nblA, which is essential for the degradation of the major cyanobacteria light-harvesting complex, the phycobilisomes. The genome codes for a site-specific recombinase and two prophage antirepressors, suggesting that it has the capacity to integrate into the host genome. Ma-LMM01 possesses six genes, including three coding for transposases, that are highly similar to homologues found in cyanobacteria, suggesting that recent gene transfers have occurred between Ma-LMM01 and its host. We propose that the Ma-LMM01 NblA homologue possibly reduces the absorption of excess light energy and confers benefits to the phage living in surface waters. This phage genome study suggests that light is central in the phage-cyanobacterium relationships where the viruses use diverse genetic strategies to control their host's photosynthesis.

Control of Microcystis aeruginosa toxic blooms by Moroccan medicinal plant-based algicides

2021 ◽  
Vol 237 ◽  
pp. 146-158
Author(s):  
Lamiaa Tebaa ◽  
Mountasser Douma ◽  
Zakaria Tazart ◽  
Khadija Mouhri ◽  
Mohammed Loudiki
Keyword(s):  
Medicinal Plant ◽  
Microcystis Aeruginosa ◽  
Toxic Blooms

Influence of increased nutrient supply on Microcystis aeruginosa at cellular and proteomic levels

2020 ◽  
Vol 85 ◽  
pp. 47-58
Author(s):  
Y Jiang ◽  
Y Liu
Keyword(s):  
Microcystis Aeruginosa ◽  
Regulatory Protein ◽  
Acid Synthesis ◽  
Nutrient Supply ◽  
Nitrogen Supply ◽  
Nitrogen And Phosphorus ◽  
Comprehensive Description ◽  
Amino Acid Synthesis ◽  
High Nutrient ◽  
Proteomic Responses

Various studies have observed that increased nutrient supply promotes the growth of bloom-forming cyanobacteria, but only a limited number of studies have investigated the influence of increased nutrient supply on bloom-forming cyanobacteria at the proteomic level. We investigated the cellular and proteomic responses of Microcystis aeruginosa to elevated nitrogen and phosphorus supply. Increased supply of both nutrients significantly promoted the growth of M. aeruginosa and the synthesis of chlorophyll a, protein, and microcystins. The release of microcystins and the synthesis of polysaccharides negatively correlated with the growth of M. aeruginosa under high nutrient levels. Overexpressed proteins related to photosynthesis, and amino acid synthesis, were responsible for the stimulatory effects of increased nutrient supply in M. aeruginosa. Increased nitrogen supply directly promoted cyanobacterial growth by inducing the overexpression of the cell division regulatory protein FtsZ. NtcA, that regulates gene transcription related to both nitrogen assimilation and microcystin synthesis, was overexpressed under the high nitrogen condition, which consequently induced overexpression of 2 microcystin synthetases (McyC and McyF) and promoted microcystin synthesis. Elevated nitrogen supply induced the overexpression of proteins involved in gas vesicle organization (GvpC and GvpW), which may increase the buoyancy of M. aeruginosa. Increased phosphorus level indirectly affected growth and the synthesis of cellular substances in M. aeruginosa through the mediation of differentially expressed proteins related to carbon and phosphorus metabolism. This study provides a comprehensive description of changes in the proteome of M. aeruginosa in response to an increased supply of 2 key nutrients.

Inhibitory effects of Cyperus alternifolius on growth of Microcystis aeruginosa and identification of algicidal substances

2019 ◽  
Vol 46 (1) ◽  
pp. 73-84
Author(s):  
L. Zhou ◽  
S. Nakai ◽  
G. F. Chen ◽  
Q. Pan ◽  
N. X. Cui ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Inhibitory Effects ◽  
Cyperus Alternifolius

Asymmetric warming enhances Microcystis aeruginosa resistance to macrophytic anti-cyanobacterial coumarin

2018 ◽  
Vol 43 (2) ◽  
pp. 265-274 ◽  
Author(s):  
W.X. Hong ◽  
S.P. Zuo ◽  
L.T. Ye ◽  
B.Q. Qin
Keyword(s):  
Microcystis Aeruginosa

scholarly journals Chemical Characterization of Microcystis aeruginosa for Feed and Energy Uses

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3013
Author(s):  
Larissa Souza Passos ◽  
Éryka Costa Almeida ◽  
Claudio Martin Pereira de Pereira ◽  
Alessandro Alberto Casazza ◽  
Attilio Converti ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Animal Feed ◽  
Renewable Energy Sources ◽  
Chemical Characterization ◽  
Cyanobacterial Blooms ◽  
Energy Sources ◽  
Carbohydrate Source ◽  
Heating Value ◽  
Adverse Health Effects ◽  
Degradation Reactions

Cyanobacterial blooms and strains absorb carbon dioxide, drawing attention to its use as feed for animals and renewable energy sources. However, cyanobacteria can produce toxins and have a low heating value. Herein, we studied a cyanobacterial strain harvested during a bloom event and analyzed it to use as animal feed and a source of energy supply. The thermal properties and the contents of total nitrogen, protein, carbohydrate, fatty acids, lipid, and the presence of cyanotoxins were investigated in the Microcystis aeruginosa LTPNA 01 strain and in a bloom material. Microcystins (hepatotoxins) were not detected in this strain nor in the bloom material by liquid chromatography coupled to mass spectrometry. Thermogravimetric analysis showed that degradation reactions (devolatilization) initiated at around 180 °C, dropping from approximately 90% to 20% of the samples’ mass. Our work showed that despite presenting a low heating value, both biomass and non-toxic M. aeruginosa LTPNA 01 could be used as energy sources either by burning or producing biofuels. Both can be considered a protein and carbohydrate source similar to some microalgae species as well as biomass fuel. It could also be used as additive for animal feed; however, its safety and potential adverse health effects should be further investigated.

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