The effects of temperature and nutrient ratios on Microcystis blooms in Lake Taihu, China: An 11-year investigation

Harmful Algae ◽  
2011 ◽  
Vol 10 (3) ◽  
pp. 337-343 ◽  
Author(s):  
Xia Liu ◽  
Xiaohua Lu ◽  
Yuwei Chen
Keyword(s):  
Lake Taihu ◽  
Nutrient Ratios ◽  
Microcystis Blooms ◽  
Effects Of Temperature

Composition of the archaeal community involved in methane production during the decomposition of Microcystis blooms in the laboratory

2012 ◽  
Vol 58 (10) ◽  
pp. 1153-1158 ◽  
Author(s):  
Peng Xing ◽  
Huabing Li ◽  
Qing Liu ◽  
Jiuwen Zheng
Keyword(s):  
Lake Taihu ◽  
Archaeal Community ◽  
Oxygen Depletion ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Polymorphism Analysis ◽  
Methanogenic Community ◽  
Controlled Systems ◽  
Microcystis Blooms ◽  
Different Temperatures

We investigated the microbial processes involved in methane (CH4) production from Microcystis bloom scums at different temperatures. A Microcystis slurry was collected from Lake Taihu and incubated in airtight bottles at 15, 25, and 35 °C. The production of CH4 was monitored, and the emission rate was calculated. The dynamics of the methanogenic community were analyzed by terminal restriction fragment length polymorphism analysis of archaeal 16S rRNA genes. Phylogenetic information for the methanogens was obtained by cloning and sequencing selected samples. Significant CH4 emission from the Microcystis scums was delayed by approximately 12 days by the natural oxygen depletion process, and CH4 production was enhanced at higher temperatures. Phylogenetic analysis indicated that the archaeal community was composed of Methanomicrobiales, Methanobacteriaceae, and a novel cluster of Archaea. An apparent succession of the methanogenic community was demonstrated, with a predominance of Methanobacteriaceae at higher temperatures. Higher temperatures enhanced the methanogenic transformation of the Microcystis biomass and the phylogenetic dominance of hydrogenotrophic methanogens, suggesting that H2 and CO2 might be the primary substrates for CH4 production during Microcystis decomposition without the participation of lake sediment. This work provides insight into the microbial components involved in Microcystis biomass fermentation in controlled systems.

scholarly journals Large-scale field evidence on the enhancement of small-sized cladocerans by Microcystis blooms in Lake Taihu, China

2012 ◽  
Vol 34 (10) ◽  
pp. 853-863 ◽  
Author(s):  
X. Sun ◽  
M. Tao ◽  
B. Qin ◽  
M. Qi ◽  
Y. Niu ◽  
...  
Keyword(s):  
Large Scale ◽  
Lake Taihu ◽  
Field Evidence ◽  
Microcystis Blooms ◽  
Scale Field ◽  
Large Scale Field

scholarly journals Simultaneous Removal of the Freshwater Bloom-Forming Cyanobacterium Microcystis and Cyanotoxin Microcystins via Combined Use of Algicidal Bacterial Filtrate and the Microcystin-Degrading Enzymatic Agent, MlrA

2021 ◽  
Vol 9 (8) ◽  
pp. 1594
Author(s):  
Suqin Wang ◽  
Siyu Yang ◽  
Jun Zuo ◽  
Chenlin Hu ◽  
Lirong Song ◽  
...  
Keyword(s):  
Biological Control ◽  
Lake Taihu ◽  
Cyanobacterial Blooms ◽  
Degrading Bacterium ◽  
Combined Use ◽  
Microcystis Blooms ◽  
Paenibacillus Sp ◽  
Microcystis Strain ◽  
Significant Release ◽  
Single Use

Freshwater cyanobacterial blooms (e.g., Microcystis blooms) constitute a major global environmental problem because of their risks to public health and aquatic ecological systems. Current physicochemical treatments of toxic cyanobacteria cause the significant release of cyanotoxin microcystins from damaged cells. Biological control is a promising eco-friendly technology to manage harmful cyanobacteria and cyanotoxins. Here, we demonstrated an efficient biological control strategy at the laboratory scale to simultaneously remove Microcystis and microcystins via the combined use of the algicidal bacterial filtrate and the microcystin-degrading enzymatic agent. The algicidal indigenous bacterium Paenibacillus sp. SJ-73 was isolated from the sediment of northern Lake Taihu, China, and the microcystin-degrading enzymatic agent (MlrA) was prepared via the heterologous expression of the mlrA gene in the indigenous microcystin-degrading bacterium Sphingopyxis sp. HW isolated from Lake Taihu. The single use of a fermentation filtrate (5%, v/v) of Paenibacillus sp. SJ-73 for seven days removed the unicellular Microcystis aeruginosa PCC 7806 and the native colonial Microcystis strain TH1701 in Lake Taihu by 84% and 92%, respectively, whereas the single use of MlrA removed 85% of microcystins. Used in combination, the fermentation filtrate and MlrA removed Microcystis TH1701 and microcystins by 92% and 79%, respectively. The present biological control thus provides an important technical basis for the further development of safe, efficient, and effective measures to manage Microcystis blooms and microcystins in natural waterbodies.

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