Prediction and elucidation of the population dynamics of Microcystis spp. in Lake Dianchi (China) by means of artificial neural networks

Li, Hongbin; Hou, Guichen; Feng, Dongming; Xiao, Baihua; Song, Lirong; Liu, Yongding

doi:10.1016/j.ecoinf.2007.03.007

Cited by 34 publications

(11 citation statements)

References 18 publications

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“…This has resulted in dense Microcystis blooms (Ͼ10 8 cells liter Ϫ1 in summer) and microcystin contamination from April to November (30,31). The results of this study reveal that the proportion of toxic Microcystis cells in the lake varied from 2.9% to 93.8% and was low from September to April and reached a maximum in June and July.…”

Section: Discussionmentioning

confidence: 74%

Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China

Zhu

Song

et al. 2014

Appl Environ Microbiol

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bToxic cyanobacterial blooms directly threaten both human safety and the ecosystem of surface waters. The widespread occurrence of these organisms, coupled with the tumor-promoting properties of the microcystin toxins that they produce, demands action to mitigate their potential impacts and, thus, a robust understanding of their ecological dynamics. In the present work, the abundance of toxic Microcystis spp. and microcystin (MC)-degrading bacteria in Dianchi Lake, located in Yunnan Province, China, was studied using quantitative PCR. Samples were taken at monthly intervals from June 2010 to December 2011 at three sampling stations within this freshwater lake. Results revealed that variation in the abundance of both total Microcystis spp. and toxic Microcystis spp. exhibited similar trends during the period of the algal bloom, including the reinvasion, pelagic growth, sedimentation, and overwintering periods, and that the proportion of toxic Microcystis was highest during the bloom and lowest in winter. Importantly, we observed that peaks in mlrA gene copy numbers of MC-degrading bacteria occurred in the months following observed peaks in MC concentrations. To understand this phenomenon, we added MCs to the MC-degrading bacteria (designated strains HW and SW in this study) and found that MCs significantly enhanced mlrA gene copy numbers over the number for the control by a factor of 5.2 for the microcystin-RR treatment and a factor of 3.7 for the microcystin-LR treatment. These results indicate that toxic Microcystis and MC-degrading bacteria exert both direct and indirect effects on each other and that MC-degrading bacteria also mediate a shift from toxic to nontoxic populations of Microcystis.

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Section: Discussionmentioning

confidence: 74%

Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China

Zhu

Song

et al. 2014

Appl Environ Microbiol

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“…Despite previous findings, the effect of LAS on M. aeruginosa is poorly understood . M. aeruginosa is a common dominant cyanobacteria that bloom in hypertrophic lakes, such as Lake Dianchi, which is a large, shallow plateau eutrophic lake covering 300 km 2 located in Southwest China and one of the most polluted lakes in China (Li et al 2007). Our previous survey showed that the total LAS concentration in some inlets of this lake can reach as high as 2.1 mg/L, as indicated by the methylene blue active substances (MBAS) (Wang et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of linear alkylbenzene sulfonate on the growth and toxin production of Microcystis aeruginosa isolated from Lake Dianchi

Wang

Zhang

Song

et al. 2014

Environ Sci Pollut Res

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The exogenous organic pollutant linear alkylbenzene sulfonate (LAS) pollution and Microcystis bloom are two common phenomena in eutrophic lakes, but the effects of LAS alone on Microcystis remain unclear. In the present study, we investigated the effects of LAS on the growth, photochemical efficiency, and microcystin production of Microcystis aeruginosa in the laboratory. Results showed that low LAS (≤10 mg/L) concentrations improved the growth of M. aeruginosa (12 days of exposure). High LAS (20 mg/L) concentrations inhibited the growth of M. aeruginosa on the first 8 days of exposure; afterward, growth progressed. After 12 days of exposure, the concentrations of chlorophyll a in algal cells were not significantly affected by any of LAS concentrations (0.05 to 20 mg/L) in the present study; by contrast, carotenoid and protein concentrations were significantly inhibited when LAS concentrations reached as high as 20 mg/L. After 6 and 12 days of exposure, low LAS (≤10 mg/ L) concentrations enhanced the maximal photochemical efficiency (Fv/Fm) and the maximal electron transport rate (ETRmax) of M. aeruginosa. Furthermore, LAS increased the microcystin production of M. aeruginosa. Extracellular and intracellular microcystin contents were significantly increased after M. aeruginosa was exposed to high LAS concentrations. Our results indicated that LAS in eutrophic lakes may increase the risk of Microcystis bloom and microcystin production.

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“…Take China as an example, its two large lakes, Lake Taihu and Lake Dianchi, all suffer from severe Microcystis-based blooms (Ye et al 2009;Li et al 2007). Some microorganisms, such as Peridinium bipes (Wu et al 1998), Bacillus fusiformis (Mu et al 2007), and Alcaligenes denitrificans (Manage et al 2000), can induce the lysis of Microcystis cells and show great potential in the control of this harmful cyanobacterium.…”

Section: Discussionmentioning

confidence: 99%

First report on the allelopathic effect of Tychonema bourrellyi (Cyanobacteria) against Microcystis aeruginosa (Cyanobacteria)

et al. 2013

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The allelopathic effect of the cyanobacterium Tychonema bourrellyi against the cyanobacterium Microcystis aeruginosa is reported for the first time in this paper. The filtrate of T. bourrellyi CHAB663 culture showed strong inhibitory effect on M. aeruginosa NIES-843, but the inhibitory effect was weakened by shaking culture, and such results implied that the allelopathic effect was probably mediated by the volatile substances secreted by T. bourrellyi. β-Ionone was identified as a major ingredient in the volatile substances in the cultures of T. bourrellyi, and it may act as an important allelochemical responsible for this allelopathic activity. The filtrates of T. bourrellyi culture were shown to decrease the maximum electron transport rate (ETR max ) and elevate the reactive oxygen species (ROS) levels in the cells of M. aeruginosa NIES-843.

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Prediction and elucidation of the population dynamics of Microcystis spp. in Lake Dianchi (China) by means of artificial neural networks

Cited by 34 publications

References 18 publications

Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China

Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China

Effects of linear alkylbenzene sulfonate on the growth and toxin production of Microcystis aeruginosa isolated from Lake Dianchi

First report on the allelopathic effect of Tychonema bourrellyi (Cyanobacteria) against Microcystis aeruginosa (Cyanobacteria)

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