The Impact of Human Activities on Freshwater Aquatic Systems

Skurlatov, Yu. I.; Ernestova, L. S.

doi:10.1002/(sici)1521-401x(199801)26:1<5::aid-aheh5>3.0.co;2-2

Cited by 7 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most marine and freshwater environments have H 2 O 2 concentrations <420 nM (Millar & Kester, ). High values, comparable to the present observations, have been recorded for agricultural drainage ditch water exposed to sunlight, 6·8 µM (Draper & Crosby, ), the maximum for waters in the former Soviet Union, 3·0 µM (Skurlatov & Ernestova, ), 10 µM (Draäbkovaä et al , ) and for intertidal rock pools, 5 µM (Abele‐Oeschger et al , ). The high Lake Magadi ROS levels in mid‐afternoon and lower concentrations in the morning are probably part of a daily pattern.…”

Section: Discussionsupporting

confidence: 89%

“…The high UV light levels, high oxygen saturation, high productivity, shallow depths, high temperature and high pH are all conducive to production of high concentrations of ROS in the water (Scully et al , ; Bruskov et al , 2002 a , b ). ROS is composed of several components, singlet oxygen ( 1 O 2 ), superoxide radicals (O 2 − ), hydrogen peroxide (H 2 O 2 ) and hydroxide radicals (OH − ) which are all strong oxidizing agents (Skurlatov & Ernestova, ). Of these, H 2 O 2 can pass through cell membranes into an organism increasing the ROS levels in the body (da Rosa et al , ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Air breathing in Magadi tilapia Alcolapia grahami, under normoxic and hyperoxic conditions, and the association with sunlight and reactive oxygen species

Johannsson

Bergman

Wood

et al. 2014

Journal of Fish Biology

View full text Add to dashboard Cite

Observations of the Magadi tilapia Alcolapia grahami in hot, highly alkaline Lake Magadi revealed that they air breathe not only during hypoxia, as described previously, but also during normoxia and hyperoxia. Air breathing under these latter conditions occurred within distinct groupings of fish (pods) and involved only a small proportion of the population. Air breathing properties (duration and frequency) were quantified from video footage. Air breathing within the population followed a diel pattern with the maximum extent of pod formation occurring in early afternoon. High levels of reactive oxygen species (ROS) in the water may be an irritant that encourages the air-breathing behaviour. The diel pattern of air breathing in the field and in experiments followed the diel pattern of ROS concentrations in the water which are amongst the highest reported in the literature (maximum daytime values of 2.53 – 8.10 μM H₂O₂). Interlamellar cell masses (ILCM) occurred between the gill lamellae of fish from the lagoon with highest ROS and highest oxygen levels, while fish from a normoxic lagoon with one third the ROS had little or no ILCM. This is the first record of air breathing in a facultative air-breathing fish in hyperoxic conditions and the first record of an ILCM in a cichlid species.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Air breathing in Magadi tilapia Alcolapia grahami, under normoxic and hyperoxic conditions, and the association with sunlight and reactive oxygen species

Johannsson

Bergman

Wood

et al. 2014

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…We found that 0.33 mg·L −1 of H 2 O 2 was the lowest effective concentration to reduce the Chl-a concentration by half in 14 and 17 h under light and darkness, respectively; no statistically significant differences were found at higher concentrations of H 2 O 2 ( Table 2 ). Such concentration overlaps with the natural levels of 0.34 mg·L −1 observed in freshwater [ 35 , 36 ].…”

Section: Resultssupporting

confidence: 56%

Application of Hydrogen Peroxide to the Control of Eutrophic Lake Systems in Laboratory Assays

Bauzá

Aguilera

Echenique

et al. 2014

Toxins

View full text Add to dashboard Cite

We exposed water samples from a recreational lake dominated by the cyanobacterium Planktothrix agardhii to different concentrations of hydrogen peroxide (H2O2). An addition of 0.33 mg·L−1 of H2O2 was the lowest effective dose for the decay of chlorophyll-a concentration to half of the original in 14 h with light and 17 h in experiments without light. With 3.33 mg·L−1 of H2O2, the values of the chemical oxygen demand (COD) decreased to half at 36 and 126 h in experiments performed with and without light, respectively. With increasing H2O2, there is a decrease in the total and faecal coliform, and this effect was made more pronounced by light. Total and faecal coliform were inhibited completely 48 h after addition of 3.33 mg·L−1 H2O2. Although the densities of cyanobacterial cells exposed to H2O2 did not decrease, transmission electron microscope observation of the trichomes showed several stages of degeneration, and the cells were collapsed after 48 h of 3.33 mg·L−1 of H2O2 addition in the presence of light. Our results demonstrate that H2O2 could be potentially used in hypertrophic systems because it not only collapses cyanobacterial cells and coliform bacteria but may also reduce chlorophyll-a content and chemical oxygen demand.

show abstract

“…Therefore, high ROS production may shift the representation of phytoplankton-classes from cyanobacteria more to green algae and diatoms, besides incidence of other known factors that can influence phytoplankton community structure, such as temperature, composition and amount of nutrients, light intensity, mixing, oxygen, etc. Respectively, Skurlatov and Ernestova (10) suggested in their review, that the decrease of H2O2 in water to concentrations lower than 3 × 10 -7 M may promote predominant development of blue-green algae.…”

Section: Resultsmentioning

confidence: 99%

Combined Exposure to Hydrogen Peroxide and LightSelective Effects on Cyanobacteria, Green Algae, and Diatoms

Drábková

Admiraal

Maršálek

2006

Environ. Sci. Technol.

259

163

View full text Add to dashboard Cite

The selective toxicity of H2O2 was investigated to develop a potential tool for limiting cyanobacterial blooms and to better understand the occurrence of cyanobacteria and other phytoplankton species in relation to reactive oxygen species in surface waters. The cyanobacterium Microcystis aeruginosa, the green alga Pseudokirchneriella subcapitata, and the diatom Navicula seminulum were tested under pulse exposure to H202 in the dark and at various irradiances. H2O2 was decomposed at rates depending on algal species and was proportional to irradiance. The cyanobacterium was affected by H202 at 10 times lower concentrations than green alga and diatom, and a strong light-dependent toxicity enhanced the difference. The inhibition was measured as photosynthetic yield (Fv/Fm) in pulse amplitude modulated fluorometry, and was confirmed by changes in minimal fluorescence (F0) and photosynthetic oxygen evolution. Single doses of 0.27 mg L(-1) of H202 caused 50% inhibition to M. aeruginosa at high irradiance. Such concentration overlaps with the highest levels of 0.34 mg L(-1) observed in natural waters, suggesting that H202 may act as a limiting factor for cyanobacterial growth.

show abstract

The Impact of Human Activities on Freshwater Aquatic Systems

Cited by 7 publications

References 13 publications

Air breathing in Magadi tilapia Alcolapia grahami, under normoxic and hyperoxic conditions, and the association with sunlight and reactive oxygen species

Air breathing in Magadi tilapia Alcolapia grahami, under normoxic and hyperoxic conditions, and the association with sunlight and reactive oxygen species

Application of Hydrogen Peroxide to the Control of Eutrophic Lake Systems in Laboratory Assays

Combined Exposure to Hydrogen Peroxide and LightSelective Effects on Cyanobacteria, Green Algae, and Diatoms

Contact Info

Product

Resources

About