Environmental factors related to the dominance of Microcystis wesenbergii and Microcystis aeruginosa in a eutrophic lake

2016 ◽  
Vol 75 (8) ◽  
Author(s):  
Ming Li ◽  
Man Xiao
Keyword(s):  
Environmental Factors ◽  
Microcystis Aeruginosa ◽  
Eutrophic Lake ◽  
Microcystis Wesenbergii

Growth and buoyancy of Microcystis aeruginosa Kütz. emend. Elenkin in a shallow eutrophic lake

1973 ◽  
Vol 184 (1074) ◽  
pp. 29-50 ◽  
Keyword(s):  
Microcystis Aeruginosa ◽  
Thermal Stratification ◽  
Control Mechanism ◽  
Euphotic Zone ◽  
Eutrophic Lake ◽  
Growth Surface ◽  
Progressive Deterioration ◽  
Exponential Increase ◽  
Shallow Eutrophic Lake ◽  
Buoyancy Control

The growth of Microcystis aeruginosa in a small, shallow eutrophic lake was studied during three consecutive seasons. The alga was shown to be continuously present in the plankton throughout the period. Exponential increase in the population was confined to a 5 to 8-week period, following the onset of thermal stratification. Populations appeared to originate near the bottom of the euphotic zone. The possession of an effective light-dependent buoyancy control mechanism enabled the alga to maintain station, though progressive deterioration of the photic conditions forced populations to rise and become dissipated within the epilimnion. Buoyancy increased after the cessation of growth; surface blooms often led to the physical removal of a majority of colonies to lee shores. Surviving colonies became generally less buoyant after the lake destratified in autumn.

Environmental factors associated with a toxic bloom of Microcystis aeruginosa

2000 ◽  
Vol 57 (1) ◽  
pp. 231-240 ◽  
Author(s):  
Jean M Jacoby ◽  
Diane C Collier ◽  
Eugene B Welch ◽  
F Joan Hardy ◽  
Michele Crayton
Keyword(s):  
Environmental Factors ◽  
Microcystis Aeruginosa ◽  
Toxin Production ◽  
Water Transparency ◽  
Cyanobacterial Blooms ◽  
Zooplankton Abundance ◽  
Factors Associated ◽  
Water Column Stability ◽  
Microcystin Concentration ◽  
Toxic Bloom

Environmental factors associated with the occurrence of toxic cyanobacterial blooms and toxin production were investigated during the summers of 1994 and 1995 in Steilacoom Lake, Washington. A pronounced and prolonged toxic bloom of Microcystis aeruginosa occurred during summer 1994 but not during 1995. Lake characteristics that were associated with the toxic bloom in 1994 were higher total phosphorus, decreased water transparency, high water column stability, high surface water temperature and pH, and decreased lake flushing. Decreased water transparency during 1994 may have been due to significantly lower zooplankton abundance. We hypothesize that this decreased transparency was caused by increased planktivory by higher numbers of coho salmon (Oncorhynchus kisutch) fingerlings during 1994 and (or) inhibition of zooplankton grazing by Microcystis. The success of Microcystis over other cyanobacteria was associated with low nitrogen to phosphorus ratios and low nitrate-nitrogen with sufficient ammonium-nitrogen concentrations. Toxin production (i.e., micrograms of microcystin per gram of plankton biomass) was not constant over the duration of detectable toxicity; hence, no relationship was found between Microcystis abundance and microcystin concentration. However, microcystin concentration was positively correlated with increasing soluble reactive phosphorus concentrations between 1 and 10 µg·L-1, indicating that toxin production may have been limited by phosphorus.

Comparing sediment bacterial communities in the macrophyte-dominated and algae-dominated areas of eutrophic Lake Taihu, China

2011 ◽  
Vol 57 (4) ◽  
pp. 263-272 ◽  
Author(s):  
Keqiang Shao ◽  
Guang Gao ◽  
Boqiang Qin ◽  
Xiangming Tang ◽  
Yongping Wang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Bacterial Community ◽  
Dna Sequences ◽  
Lake Taihu ◽  
Bacterial Community Composition ◽  
Eutrophic Lake ◽  
Banding Patterns ◽  
Factors Affecting ◽  
Specific Variation ◽  
Area Variation

Bacterial community structure and the effects of several environmental factors on bacterial community distribution were investigated in the sediment of the macrophyte-dominated and algae-dominated areas in a large, shallow, eutrophic freshwater lake (Lake Taihu, China). Surface sediment samples were collected at 6 sampling sites (3 sites from each of the 2 areas) on 15 February and 15 August 2009. Based on cluster analysis of the DGGE banding patterns, there were significant seasonal variations in the structure of the sediment bacterial community in the macrophyte- and algae-dominated areas, and site-specific variation within an area and between 2 areas. However, there were no significant between-area variations due to the large within-area variation. Analysis of DNA sequences showed that there were differences in the species composition of the sediment bacteria between the macrophyte- and algae-dominated area clone libraries. In the macrophyte-dominated area library, the bacterial community was dominated by Deltaproteobacteria, Verrucomicrobia, Acidobacteria, Bacteroidetes, Gammaproteobacteria, and Betaproteobacteria. OP10 was found in the library of this area but not in the algae-dominated area library. The algae-dominated area library was dominated by Betaproteobacteria, Deltaproteobacteria, Gammaproteobacteria, and Acidobacteria. Cyanobacteria, Alphaproteobacteria, and Planctomycetes were found in this area library but not in the macrophyte-dominated area library. Canonical correspondence analysis demonstrated that total phosphorus and water temperature were the dominant environmental factors affecting bacterial community composition in the sediment.

Allelopathic effect of Microcystis aeruginosa on Microcystis wesenbergii: microcystin-LR as a potential allelochemical

Hydrobiologia ◽  
2013 ◽  
Vol 727 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Jia Yang ◽  
Xiru Deng ◽  
Qiming Xian ◽  
Xin Qian ◽  
Aimin Li
Keyword(s):  
Microcystis Aeruginosa ◽  
Allelopathic Effect ◽  
Microcystis Wesenbergii

Role of chemical and physical variables in regulating microcystin-LR concentration in phytoplankton of eutrophic lakes

2000 ◽  
Vol 57 (8) ◽  
pp. 1584-1593 ◽  
Author(s):  
Brian G Kotak ◽  
Angeline K-Y Lam ◽  
Ellie E Prepas ◽  
Steve E Hrudey
Keyword(s):  
Environmental Factors ◽  
Microcystis Aeruginosa ◽  
Total Phosphorus ◽  
Inorganic Nitrogen ◽  
Eutrophic Lakes ◽  
Cyanobacterial Toxin ◽  
Phytoplankton Communities ◽  
Physical Variables ◽  
Main Producer

A survey of eutrophic to hypereutrophic hardwater lakes in central Alberta was conducted to test the hypotheses that the concentration of the cyanobacterial toxin microcystin-LR (MC-LR) in phytoplankton is regulated by environmental factors that affect both the biomass of the main producer of the toxin, Microcystis aeruginosa, and the concentration of the toxin in the cells. Of all environmental factors examined, total phosphorus was the strongest correlate of both M. aeruginosa biomass and cellular MC-LR (expressed as micrograms per gram of M. aeruginosa). Microcystis aeruginosa biomass was also strongly negatively related to the total nitrogen to total phosphorus ratio (TN:TP) and inorganic nitrogen (NO2- + NO3-, NH4+). A univariate regression model of TN:TP explained the most variation in MC-LR concentration (expressed as nanograms of cellular toxin per litre) in mixed phytoplankton communities. This study indicated that MC-LR dynamics in phytoplankton of lakes was related to changes in the concentration and ratio of phosphorus and nitrogen.

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