Management of Target Algae by Using Copper-Based Algaecides: Effects of Algal Cell Density and Sensitivity to Copper

Tsai, Kuo-Pei

doi:10.1007/s11270-016-2926-8

Cited by 30 publications

(10 citation statements)

References 54 publications

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“…The species-dependent variation in algal sensitivity to copper was also recently reported by Tsai35. The 96-h-EC 50 value in Microcystis species to Cu 2+ was in the order of M. flos-aquae > M. viridis > M. aeruginosa > M. wesenbergii and ranged from 0.09 to 0.49 mg L −1 .…”

Section: Discussionsupporting

confidence: 77%

Species-dependent variation in sensitivity of Microcystis species to copper sulfate: implication in algal toxicity of copper and controls of blooms

Wei

Tan

et al. 2017

Sci Rep

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Copper sulfate is a frequently used reagent for Microcystis blooms control but almost all the previous works have used Microcystis aeruginosa as the target organism to determine dosages. The aim of this study was to evaluate interspecific differences in the responses of various Microcystis species to varying Cu2+ concentrations (0, 0.05, 0.10, 0.25, and 0.50 mg L−1). The half maximal effective concentration values for M. aeruginosa, M. wesenbergii, M. flos-aquae, and M. viridis were 0.16, 0.09, 0.49, and 0.45 mg L−1 Cu2+, respectively. This showed a species-dependent variation in the sensitivity of Microcystis species to copper sulfate. Malonaldehyde content did not decrease with increasing superoxide dismutase content induced by increasing Cu2+, suggesting that superoxide dismutase failed to reduce Cu2+ damage in Microcystis. Considering the risk of microcystin release when Microcystis membranes are destroyed as a result of Cu2+ treatment and the stimulation effects of a low level of Cu2+ on growth in various species, our results suggest that copper sulfate treatment for Microcystis control could be applied before midsummer when M. aeruginosa and M. viridis are not the dominant species and actual amount of Cu2+ used to control M. wesenbergii should be much greater than 0.10 mg L−1.

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Section: Discussionsupporting

confidence: 77%

Species-dependent variation in sensitivity of Microcystis species to copper sulfate: implication in algal toxicity of copper and controls of blooms

Wei

Tan

et al. 2017

Sci Rep

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“…In the high‐density algal treatments, similar sorption occurred in the 2 formulations, although it was significantly decreased from the low‐density treatments. This may suggest greater interaction of some binding sites with either formulation though overall decreased sorption per cell because of a lower copper to cell ratio (Franklin et al ; Tsai ). Captain was significantly more potent to algae at higher‐density exposures than copper sulfate, suggesting that sorption alone did not correlate with toxicity and that chelated copper may introduce more internal copper to the cells, thereby imparting more toxicity.…”

Section: Discussionmentioning

confidence: 99%

The presence of algae mitigates the toxicity of copper‐based algaecides to a nontarget organism

Bishop

Willis

Richardson

et al. 2018

Enviro Toxic and Chemistry

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Copper-based algaecides are routinely applied to target noxious algal blooms in freshwaters. Standard toxicity testing data with copper suggest that typical concentrations used to control algae can cause deleterious acute impacts to nontarget organisms. These "clean" water experiments lack algae, which are specifically targeted in field applications of algaecides and contain competing ligands. The present research measured the influence of algae on algaecide exposure and subsequent response of the nontarget species Daphnia magna to copper sulfate and an ethanolamine-chelated copper algaecide (Captain®). Significant shifts (p < 0.05) in D. magna 48-h median lethal concentration (LC50) values were found when algae were present in exposures along with a copper salt or a chelated copper formulation. Copper sulfate 48-h LC50 values shifted from 75.3 to 317.8 and 517.8 μg Cu/L, whereas Captain increased from 353.8 to 414.2 and 588.5 μg Cu/L in no algae, 5 × 10 , and 5 × 10 cells/mL algae treatments, respectively. Larger shifts were measured with copper sulfate exposures, although Captain was less toxic to D. magna in all corresponding treatments. Captain was more effective at controlling Scenedesmus dimorphus at most concentrations, and control was inversely proportional to toxicity to D. magna. Overall, incorporating target competing ligands (i.e., algae) into standard toxicity testing is important for accurate risk assessment, and copper formulation can significantly alter algaecidal efficacy and risks to nontarget organisms. Environ Toxicol Chem 2018;37:2132-2142. © 2018 SETAC.

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“…Magnesium had similar effects on the toxicity of nickel and cobalt to Aerobacter aerogenes, and it was found that higher levels of magnesium reduced the amounts of these metals bound by the cell [57]. Tsai [58], in a study of chromium and copper sensitivity in K. aerogenes, found both have synergistic and antagonistic effects. Very low concentrations of Cd 2+ or Zn 2+ potentiated the lethal action of Cu 2+ , mixtures of Cu 2+ and CrO 4 2gave an additive response, and mixtures of Cd 2+ with CrO 4 2were antagonistic.…”

Section: -mentioning

confidence: 97%

A Gateway to Metal Resistance: Bacterial Response to Heavy Metal Toxicity in the Biological Environment

Aljerf¹

2018

Ann Adv Chem

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Heavy metals and metalloids are dangerous because they have the tendency to bioaccumulate in biological organisms over a period of time. However, it is conceived that a number of phytochemical agents as well microorganism can act as heavy metal removing agent both from human beings and the environment surrounding. For instance, microbes are used for the removal of heavy metals from the water bodies including bacteria, fungi, algae and yeast. This review shows that bacteria can play an important role in understanding the uptake and potential removal behaviour of heavy metal ions. The bacteria are chosen based on their resistance to heavy metals (incl. their toxicities) and capacity of adsorbing them. Due to specifi c resistance transfer factors, cell impermeability is drastically inhibited by several ion (i.e. mercury, cadmium, cobalt, copper, arsenic) forms. Between these elements, free-ion cadmium and copper concentrations in the biological medium provide more accurate determination of metal concentrations that affect the bacteria, than with most of the other existing media. Metal toxicity is usually assessed by using appropriate metal ion chelators and adjusting pH factor. Bacteria and metals in the ecosystem can form synergistic or antagonistic relationships, supplying each other with nutrients or energy sources, or producing toxins to reduce growth and competition for limiting nutritional elements. Thus, this relation may present a more sustainable approach for the restoration of contaminated sources.

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Management of Target Algae by Using Copper-Based Algaecides: Effects of Algal Cell Density and Sensitivity to Copper

Cited by 30 publications

References 54 publications

Species-dependent variation in sensitivity of Microcystis species to copper sulfate: implication in algal toxicity of copper and controls of blooms

Species-dependent variation in sensitivity of Microcystis species to copper sulfate: implication in algal toxicity of copper and controls of blooms

The presence of algae mitigates the toxicity of copper‐based algaecides to a nontarget organism

A Gateway to Metal Resistance: Bacterial Response to Heavy Metal Toxicity in the Biological Environment

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