ASSEMBLÉIAS MICROFITOPLANCTÔNICAS NUM LAGO URBANO DA CIDADE DE CURITIBA (ESTADO DO PARANÁ, BRASIL)

2007 ◽  
Vol 29 (66) ◽  
Author(s):  
Gilmar Perbiche-Neves ◽  
Mateus Ferrareze ◽  
André Ricardo Ghidini ◽  
Lineu de Brito ◽  
Madalena Tomi Shirata
Keyword(s):  
Microcystis Aeruginosa ◽  
Scenedesmus Quadricauda ◽  
Aulacoseira Granulata

O lago artificial do Parque Passeio Público tem sido submetido a grandes descargas de nutrientes, que associado à baixa profundidade e ao longo tempo de residência da água, contribuiu para a ocorrência de florações de fitoplâncton. O principal objetivo deste estudo foi analisar a variabilidade sazonal da estrutura das assembléias microfitoplanctônicas (composição e dominância) num lago urbano de Curitiba(PR). Os dados foram obtidos mensalmente, entre agosto/2002 a julho/2003, em quatro pontos de amostragem. O número total de táxons identificados foi vinte e nove. Houve predominância de Chlorococcaceae (17 taxa), seguido de Cyanophyceae (6 taxa) e Coscinodiscophyceae (4 taxa). As espécies com maior ocorrência, em ordem decrescente, foram: Scenedesmus quadricauda, Golenkinia radiata, Microcystis aeruginosa, Pediastrum duplex var. boryanum, Kirchneriella lunaris, Staurastrum paradoxum, Micractinium pusillum,Aulacoseira granulata, Lagerheimia ciliata e Sphaerocystis schroeteri. O estudo conclui que a comunidade fitoplanctônica responde às variações ambientais no lago, espacial e temporalmente.

scholarly journals The formation of haloacetamides, as an emerging class of N-DBPs, from chlor(am)ination of algal organic matter extracted from Microcystis aeruginosa, Scenedesmus quadricauda and Nitzschia palea

RSC Advances ◽  
2017 ◽  
Vol 7 (13) ◽  
pp. 7679-7687 ◽  
Author(s):  
Ni Zhang ◽  
Cao Liu ◽  
Fei Qi ◽  
Bingbing Xu
Keyword(s):  
Organic Matter ◽  
Microcystis Aeruginosa ◽  
Scenedesmus Quadricauda ◽  
Nitzschia Palea ◽  
Algal Organic Matter

The formation of haloacetamides, as an emerging class of N-DBPs, from AOM disinfection extracted from Microcystis aeruginosa, Scenedesmus quadricauda and Nitzschia palea.

Effect of Fe2+ and Fe 3+ on the Growth of Microcystis aeruginosa, Scenedesmus quadricauda and Cyclotella sp.

2011 ◽  
Vol 183-185 ◽  
pp. 510-515
Author(s):  
Qin Wang ◽  
Zong Xue Xu ◽  
Xia Jiang ◽  
Ji Xi Gao
Keyword(s):  
Microcystis Aeruginosa ◽  
Culture Medium ◽  
Growth Curves ◽  
Scenedesmus Quadricauda ◽  
Logistic Growth ◽  
High Concentration ◽  
Nutrient Sources ◽  
Monod Equation ◽  
Maximum Biomass ◽  
Logistic Growth Model

Ferrum is one of the important nutrient sources for algae in lakes. The changes of concentration in water body have great effect on the formation of dominant algae. Microcystis aeruginosa, Scenedesmus quadricauda and Cyclotella were examined in M11 culture medium which included different Fe2+ and Fe3+ concentration. Growth curves of these three algae were fitted by logistic growth-model, respectively. The maximum biomass K, inflection t and growth rate µ of those algae were investigated. The effects of Fe2+ and Fe3+ on the growth of algae were investigated by using the Monod equation. The semi-saturation constants were calculated. The results showed that the maximum biomass of these three algae did not increase with the increasing of Fe2+ and Fe3+ concentration. Low concentration of Fe2+ (200-500 mg/L) and high concentration of Fe3+ (2000-5000 mg/L) were more suitable to the growth of three algae. The sequence of the maximum biomass was: Scenedesmus quadricauda>Microcystis aeruginosa>Cyclotella.

scholarly journals Effects of lanthanum(III) and EDTA on the growth and competition of Microcystis aeruginosa and Scenedesmus quadricauda

Limnologica ◽  
2009 ◽  
Vol 39 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Xiangcan Jin ◽  
Zhaosheng Chu ◽  
Feng Yan ◽  
Qingru Zeng
Keyword(s):  
Microcystis Aeruginosa ◽  
Scenedesmus Quadricauda

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
Sign in / Sign up

Export Citation Format

Share Document