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Combatting cyanobacteria with hydrogen peroxide: a laboratory study on the consequences for phytoplankton community and diversity.

Weenink EF, Luimstra VM, Schuurmans JM, Van Herk MJ, Visser PM, Matthijs HC - Front Microbiol (2015)

Bottom Line: To acquire insight into the impact of HP on other phytoplankton species, we have followed the succession of three phytoplankton groups in lake samples that were treated with different concentrations of HP using a taxa-specific fluorescence emission test.The test was used to pursue HP application in a Planktothrix agardhii-dominated lake sample and displayed a promising shift in the phytoplankton community in only a few weeks.From a low-diversity community, a change to a status with a significantly higher diversity and increased abundance of eukaryotic phytoplankton species was established.

View Article: PubMed Central - PubMed

Affiliation: Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam Amsterdam, Netherlands.

ABSTRACT
Experiments with different phytoplankton densities in lake samples showed that a high biomass increases the rate of hydrogen peroxide (HP) degradation and decreases the effectiveness of HP in the selective suppression of dominant cyanobacteria. However, selective application of HP requires usage of low doses only, accordingly this defines the limits for use in lake mitigation. To acquire insight into the impact of HP on other phytoplankton species, we have followed the succession of three phytoplankton groups in lake samples that were treated with different concentrations of HP using a taxa-specific fluorescence emission test. This fast assay reports relatively well on coarse changes in the phytoplankton community; the measured data and the counts from microscopical analysis of the phytoplankton matched quite well. The test was used to pursue HP application in a Planktothrix agardhii-dominated lake sample and displayed a promising shift in the phytoplankton community in only a few weeks. From a low-diversity community, a change to a status with a significantly higher diversity and increased abundance of eukaryotic phytoplankton species was established. Experiments in which treated samples were re-inoculated with original P. agardhii-rich lake water demonstrated prolonged suppression of cyanobacteria, and displayed a remarkable stability of the newly developed post-HP treatment state of the phytoplankton community.

No MeSH data available.


Related in: MedlinePlus

Degradation rates of HP in lake water with a phytoplankton density of 2 × control lake water (A), water as sampled (control water, B), and diluted lake water with a phytoplankton density of 0.5 × original lake sample (C). After addition, the remaining HP concentration was determined at the indicated time points.  represents 2.5 mg·L−1;  5 mg·L−1;  10 mg·L−1;  20 mg·L−1 and  50 mg·L−1 HP (all are the concentrations at time zero).
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Figure 2: Degradation rates of HP in lake water with a phytoplankton density of 2 × control lake water (A), water as sampled (control water, B), and diluted lake water with a phytoplankton density of 0.5 × original lake sample (C). After addition, the remaining HP concentration was determined at the indicated time points. represents 2.5 mg·L−1; 5 mg·L−1; 10 mg·L−1; 20 mg·L−1 and 50 mg·L−1 HP (all are the concentrations at time zero).

Mentions: Using three phytoplankton densities (2:1:0.5 ratio), the rate of degradation of added HP is shown in Figure 2. The disappearance of HP was appreciably faster in the concentrated sample (Figure 2A) than in the original lake sample (Figure 2B) and in the diluted sample (Figure 2C). As a result, no HP could be detected in samples treated with a dose of 2.5 and 5 mg·L−1 for concentrated water 4 h after addition, but in the diluted sample 0.4 and 4.2 mg·L−1 HP of the 2.5 and 5 mg·L−1 additions respectively were still retrieved. After 24 h, all HP was degraded in the concentrated water sample, except for the highest dose of 50 mg·L−1, which was still present at 6.3 mg·L−1 HP and of the similar start concentration the diluted water sample still contained 24.9 mg·L−1 HP after 24 h. The original lake sample showed no more traces of added HP below 5 mg·L−1 after 24 h; but of the dose of 10 mg·L−1 1.8 mg·L−1 HP was still present (Figure 2B).


Combatting cyanobacteria with hydrogen peroxide: a laboratory study on the consequences for phytoplankton community and diversity.

Weenink EF, Luimstra VM, Schuurmans JM, Van Herk MJ, Visser PM, Matthijs HC - Front Microbiol (2015)

Degradation rates of HP in lake water with a phytoplankton density of 2 × control lake water (A), water as sampled (control water, B), and diluted lake water with a phytoplankton density of 0.5 × original lake sample (C). After addition, the remaining HP concentration was determined at the indicated time points.  represents 2.5 mg·L−1;  5 mg·L−1;  10 mg·L−1;  20 mg·L−1 and  50 mg·L−1 HP (all are the concentrations at time zero).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4510418&req=5

Figure 2: Degradation rates of HP in lake water with a phytoplankton density of 2 × control lake water (A), water as sampled (control water, B), and diluted lake water with a phytoplankton density of 0.5 × original lake sample (C). After addition, the remaining HP concentration was determined at the indicated time points. represents 2.5 mg·L−1; 5 mg·L−1; 10 mg·L−1; 20 mg·L−1 and 50 mg·L−1 HP (all are the concentrations at time zero).
Mentions: Using three phytoplankton densities (2:1:0.5 ratio), the rate of degradation of added HP is shown in Figure 2. The disappearance of HP was appreciably faster in the concentrated sample (Figure 2A) than in the original lake sample (Figure 2B) and in the diluted sample (Figure 2C). As a result, no HP could be detected in samples treated with a dose of 2.5 and 5 mg·L−1 for concentrated water 4 h after addition, but in the diluted sample 0.4 and 4.2 mg·L−1 HP of the 2.5 and 5 mg·L−1 additions respectively were still retrieved. After 24 h, all HP was degraded in the concentrated water sample, except for the highest dose of 50 mg·L−1, which was still present at 6.3 mg·L−1 HP and of the similar start concentration the diluted water sample still contained 24.9 mg·L−1 HP after 24 h. The original lake sample showed no more traces of added HP below 5 mg·L−1 after 24 h; but of the dose of 10 mg·L−1 1.8 mg·L−1 HP was still present (Figure 2B).

Bottom Line: To acquire insight into the impact of HP on other phytoplankton species, we have followed the succession of three phytoplankton groups in lake samples that were treated with different concentrations of HP using a taxa-specific fluorescence emission test.The test was used to pursue HP application in a Planktothrix agardhii-dominated lake sample and displayed a promising shift in the phytoplankton community in only a few weeks.From a low-diversity community, a change to a status with a significantly higher diversity and increased abundance of eukaryotic phytoplankton species was established.

View Article: PubMed Central - PubMed

Affiliation: Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam Amsterdam, Netherlands.

ABSTRACT
Experiments with different phytoplankton densities in lake samples showed that a high biomass increases the rate of hydrogen peroxide (HP) degradation and decreases the effectiveness of HP in the selective suppression of dominant cyanobacteria. However, selective application of HP requires usage of low doses only, accordingly this defines the limits for use in lake mitigation. To acquire insight into the impact of HP on other phytoplankton species, we have followed the succession of three phytoplankton groups in lake samples that were treated with different concentrations of HP using a taxa-specific fluorescence emission test. This fast assay reports relatively well on coarse changes in the phytoplankton community; the measured data and the counts from microscopical analysis of the phytoplankton matched quite well. The test was used to pursue HP application in a Planktothrix agardhii-dominated lake sample and displayed a promising shift in the phytoplankton community in only a few weeks. From a low-diversity community, a change to a status with a significantly higher diversity and increased abundance of eukaryotic phytoplankton species was established. Experiments in which treated samples were re-inoculated with original P. agardhii-rich lake water demonstrated prolonged suppression of cyanobacteria, and displayed a remarkable stability of the newly developed post-HP treatment state of the phytoplankton community.

No MeSH data available.


Related in: MedlinePlus