Effects of biocontrol with an atyid shrimp (Caridina denticulata) and a bagrid catfish (Pseudobagrus fulvidraco) on toxic cyanobacteria bloom (Microcystis aeruginosa) in a eutrophic agricultural reservoir

2016 ◽  
Vol 15 (3) ◽  
pp. 483-497 ◽  
Author(s):  
Min-Seob Kim ◽  
Yeonjung Lee ◽  
Seongjin Hong ◽  
Soon-Jin Hwang ◽  
Baik-Ho Kim ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Cyanobacteria Bloom ◽  
Toxic Cyanobacteria ◽  
Agricultural Reservoir

Occurrence of copper resistant mutants in the toxic cyanobacteria Microcystis aeruginosa: characterisation and future implications in the use of copper sulphate as algaecide

2004 ◽  
Vol 38 (8) ◽  
pp. 2207-2213 ◽  
Author(s):  
Libertad Garcı́a-Villada ◽  
Marcos Rico ◽  
Marı́a Altamirano ◽  
Laura Sánchez-Martı́n ◽  
Victoria López-Rodas ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Copper Sulphate ◽  
Toxic Cyanobacteria ◽  
Resistant Mutants

Grazing of the copepod Cyclops vicinus on toxic Microcystis aeruginosa: potential for controlling cyanobacterial blooms and transfer of toxins

2018 ◽  
Vol 47 (3) ◽  
pp. 296-302 ◽  
Author(s):  
Zakaria A. Mohamed ◽  
Asmaa A. Bakr ◽  
Hamed A. Ghramh
Keyword(s):  
Microcystis Aeruginosa ◽  
Grazing Rate ◽  
Cyanobacterial Blooms ◽  
Feeding Experiments ◽  
Cyclops Vicinus ◽  
Ankistrodesmus Falcatus ◽  
Toxic Cyanobacteria ◽  
Study Laboratory ◽  
Grazer Species

Abstract Grazing of zooplankton on phytoplankton may contribute to a reduction of harmful cyanobacteria in eutrophic waters. However, the feeding capacity and interaction between zooplankton and toxic cyanobacteria vary among grazer species. In this study, laboratory feeding experiments were designed to measure the grazing rate of the copepod Cyclops vicinus on Microcystis aeruginosa and the potential microcystin (MC) accumulation in the grazer. Copepods were fed a mixed diet of the edible green alga Ankistrodesmus falcatus and toxic M. aeruginosa for 10 days. The results showed that C. vicinus efficiently ingested toxic Microcystis cells with high grazing rates, varying during the feeding period (68.9–606.3 Microcystis cells animal-1 d-1) along with Microcystis cell density. Microcystis cells exhibited a remarkable induction in MC production under grazing conditions with concentrations 1.67–12.5 times higher than those in control cultures. Furthermore, C. vicinus was found to accumulate MCs in its body with concentrations increasing during the experiment (0.05–3.21 μg MC animal-1). Further in situ studies are needed to investigate the ability of Cyclops and other copepods to assimilate and detoxify MCs at environmentally relevant concentrations before deciding on the biocontrol of Microcystis blooms by copepods.

Demographic responses of selected rotifers (Rotifera) and cladocerans (Cladocera) fed toxic Microcystis aeruginosa (Cyanobacteria)

2020 ◽  
Vol 193 (3) ◽  
pp. 261-274
Author(s):  
Alfredo Pérez-Morales ◽  
S.S.S. Sarma ◽  
S. Nandini ◽  
Cristian Alberto Espinosa-Rodríguez ◽  
Ligia Rivera-De la Parra
Keyword(s):  
Population Growth ◽  
Life Table ◽  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Somatic Growth ◽  
Phytoplankton Species ◽  
Scenedesmus Acutus ◽  
Cladoceran Species ◽  
Toxic Cyanobacteria ◽  
Demographic Responses

Tropical waterbodies contain several species of toxic cyanobacteria including Microcystis, which adversely affect the somatic growth, survival and fecundity of zooplankton. Scenedesmus, one of the most common green algae, is even found in Microcystis -dominated waterbodies. It is, therefore possible that in natural ponds, rotifers and cladocerans feed on mixed phytoplankton species containing algae and cyanobacteria. In this work, we quantified demographic responses of three rotifer species (Brachionus calyciflorus, B. rubens, and Plationus patulus), and three cladoceran species (Simocephalus mixtus, Daphnia cf. mendotae and Moina macrocopa) fed toxic Microcystis aeruginosa only or mixed with Scenedesmus acutus. The highest population growth for both rotifer and cladoceran species was observed when Scenedesmus was offered alone or at 75 % of the diet. Daphnia cf. mendotae and B. rubens were less affected by Microcystis while M. macrocopa and B. calyciflorus were more adversely influenced, which was also corroborated by life table demography. In competition bioassays, D. cf. mendotae was more efficient, alone or in competition, when fed with 50 or 25 % of Microcystis. This work explains the dynamics of the zooplanktonic community against gradual changes in phytoplankton due to the presence of cyanobacteria.

Moroccan actinobacteria with promising activity against toxic cyanobacteria Microcystis aeruginosa

2020 ◽  
Vol 28 (1) ◽  
pp. 235-245
Author(s):  
Soukaina El Amrani Zerrifi ◽  
El Mahdi Redouane ◽  
Richard Mugani ◽  
Inês Ribeiro ◽  
Maria de Fátima Carvalho ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Toxic Cyanobacteria

scholarly journals SIZE EFFECT OF COPPER NANOPARTICALS ON MICROCYSTIS AERUGINOSA

2018 ◽  
Vol 16 (2) ◽  
pp. 361-367
Author(s):  
Nguyen Trung Kien ◽  
Tran Thi Thu Huong ◽  
Nguyen Hoai Chau ◽  
Dang Dinh Kim ◽  
Duong Thi Thuy
Keyword(s):  
Particle Size ◽  
Microcystis Aeruginosa ◽  
Copper Nanoparticles ◽  
Algal Blooms ◽  
Water Environment ◽  
Freshwater Ecosystems ◽  
Particle Sizes ◽  
Toxic Cyanobacteria ◽  
The Stability ◽  
Effect Of Copper

Cyanobacterial and toxins produced in cyanobacterial water blooms cause serious environmental problems which effects on freshwater ecosystems. The use of nanomaterials to control algal blooms is a new potential way for practical application due to its antibacterial as well as distinct physicochemical properties of nanomaterials. The particle size is one of the most determinant characteristics creating the different between nanomaterials and their larger bulk counterparts. However, size-dependent toxicity of nanoparticles has remained largely unknown. This study aimed to evaluate effect of three different nanoparticle sizes (d ≤ 10 nm; 30 nm ≤ d ≤ 40 nm and d ≥ 50 nm) on toxic cyanobacteria Microcystis aeruginosa. The copper nanoparticles were synthesized by electrochemical method and coated with chitosan to enhance the stability of materials in the water environment. The copper nanoparticle concentrations selected for toxic test were range from 0 (control); 0,01ppm; 0,05ppm; 0,1 ppm; 1ppm and 5 ppm. After ten days of experiment, the growth of M. aeruginosa was mainly affected at concentrations of 1 ppm and 5 ppm and there are no differences in inhibition between the particle sizes with efficiency of more than 80% in comparison to control. The highest toxicity of copper nanoparticles in M. aeruginosa was observed at particle size of 30 nm ≤ d ≤ 40 nm with EC50 = 0,73 ppm, which was respectively three to seven times less than the particle sizes of d ≥ 50 nm (EC50 = 2,62 ppm) and d ≤ 10nm (EC50 = 5,02 ppm) at the same time.

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

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