Responses of Lyngbya wollei to algaecide exposures and a risk characterization associated with their use

Calomeni, Alyssa J.; Iwinski, Kyla J.; Kinley, Ciera M.; McQueen, Andrew D.; Rodgers, John H.

doi:10.1016/j.ecoenv.2015.03.004

Cited by 18 publications

(28 citation statements)

References 30 publications

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“…An appropriate formulation and concentration of copper applied for controlling problematic algae differ from site to site and therefore need to be carefully determined, because it depends on several factors such as target algal cell density, target and non-target species sensitivity to copper, site water characteristics, and copper-based algaecide application history (Bishop and Rodgers, 2012;Calomeni et al, 2015a).…”

Section: Margins Of Safety For P Subcapitata At Different Cell Densimentioning

confidence: 99%

“…Options for controlling problematic algae include mechanical, physical, biological, and chemical approaches (Timmons, 2005, Armellina et al, 1996, Gumbo et al, 2008Calomeni et al, 2015a). Chemicals or algaecide applications are usually used to manage algal densities because of their effectiveness (Whitaker et al, 1978;Lam et al, 1995;Schrader and Dennis, 2005;Hoko and Makado, 2011).…”

Section: Introductionmentioning

confidence: 99%

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

Tsai

2016

Water Air Soil Pollut

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Public concerns regarding the use of copperbased algaecide for controlling problematic algae may arise due to the risks it creates to non-target algae. To examine this concern, a series of comparative algal toxicity experiments were conducted to study effects of prokaryotic and eukaryotic algal cell densities on their responses to exposures of copper sulfate and copper-ethanolamine (Cu-EA). Microcystis aeruginosa and Pseudokirchneriella subcapitata were cultured separately in BG 11 medium to three initial cell densities (5 × 10 4 , 5 × 10 5 , and 5 × 10 6 cells/mL). The 96-h EC 50 values of copper sulfate for M. aeruginosa at the three cell densities were 9, 63, and 112 μg Cu/L, respectively; and were 192, 1873, and 4619 μg Cu/L for P. subcapitata. The 96-h EC 50 values of Cu-EA were 101 and 2579 μg Cu/L for M. aeruginosa and P. subcapitata at 10 6 cells/mL. The margin of safety (MOS) for P. subcapitata at 10 4 cells/mL was 1.3, 0.9, and 0.8 when M. aeruginosa cell density was 10 4 , 10 5 , and 10 6 cells/mL. This laboratory study suggests that applying copper-based algaecides to control problematic algae at a relatively low cell density would inhibit their growth with minimum impacts on non-target algae; risks to non-target algae would increase with increases of problematic algal cell density.

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Section: Margins Of Safety For P Subcapitata At Different Cell Densimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Tsai

2016

Water Air Soil Pollut

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“…According to the study by Murray-Gulde et al (2002), chelated copper-based algaecides could provide a higher concentration of copper in the water column for a longer period of time and loss to the sediment is slower than for a non-chelated copper-based algaecide such as copper sulfate. An appropriate formulation and concentration of copper applied for site waters differs from site to site and therefore needs to be carefully determined, because it depends on several factors such as sensitivity of target algae, degree of infestation (e.g., cell density), site water characteristics, and copper-based algaecide application history (Bishop and Rodgers, 2012;Calomeni et al, 2015b). In specific situations with a concern for microcystin release into water resources (e.g., ineffective removal of extracellular microcystin in conventional water treatment plants and water-contact activities) (Chow et al, 1999;Himberg et al, 1989;Chorus et al, 2000), information regarding relationships of copper concentrations and potential release of microcystin after copper-based algaecide treatment is important.…”

Section: Exposure Concentration (Mg Cu/l) Total Microcystin Extracellmentioning

confidence: 99%

Effects of two copper compounds on Microcystis aeruginosa cell density, membrane integrity, and microcystin release

Tsai

2015

Ecotoxicology and Environmental Safety

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“…Multiple approaches (e.g., mechanical, biological, chemical, cultural) to L. wollei management are often considered. With dynamic nature (e.g., depth, location, access, terrain) of many of the typical infested sites, mechanical control is unlikely an effective option and requires dedicated personnel and maintenance (Calomeni et al 2015). Biological control measures have not been shown to be a viable option for large-scale management of this species.…”

Section: Introductionmentioning

confidence: 99%

“…Significant differences in algaecide formulations, including those with similar listed active ingredients, have been documented (Bishop et al 2018a). Chelated copper-based algaecides are common components of L. wollei management programs and are often combined with surfactants to aid penetration (Duke 2007;Bishop et al 2015;Calomeni et al 2015). The chelation is designed to improve stability of the copper ion in solution and alter charge properties of resulting copper complexes to passively penetrate cell membranes (Stauber and Florence 1987;Straus and Tucker 1993;Mastin and Rodgers 2000).…”

Section: Introductionmentioning

confidence: 99%

Controlling Lyngbya wollei in three Alabama, USA reservoirs: summary of a long-term management program

et al. 2019

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Large-scale Lyngbya wollei (Cyanobacteria, Oscillatoriales) infestations are increasing throughout the USA and globally and causing significant obstruction of water resource uses. Decision makers and stakeholders encountering this nuisance organism often seek management options. Many approaches to L. wollei management may be ineffective or not applicable to specific field sites. Chemical control with United States Environmental Protection Agency registered algaecides has shown to be effective, although the specific formulation, concentration, and application frequency can all govern efficacy. This study summarizes results from a long-term and adaptive management program on extensive L. wollei infestations in three central Alabama, USA reservoirs (Lay Lake, Jordan Lake and Lake Mitchell) managed by Alabama Power Company. Multiple treatment strategies including numerous algaecides, combinations and addition of surfactants were used in attempts to control the nuisance cyanobacterium and preserve multiple beneficial functions of the resource. Ultimately, operational shift toward one technology, a double-chelated copper algaecide with surfactants and emulsifiers (Captain ® XTR) resulted in more efficient and economical control. There were significant (P < 0.05) decreases in historic L. wollei acres requiring treatment through time on each reservoir. Throughout this study period, a 51.4, 88.1 and 94.7% percent decrease in total nuisance acres treated was realized on Lay Lake, Jordan Lake and Lake Mitchell, respectively. The large-scale and long-term dataset presented herein, covering multiple candidate treatment programs, provides valuable information to guide management decisions on other water resources impacted by L. wollei infestations.

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Responses of Lyngbya wollei to algaecide exposures and a risk characterization associated with their use

Cited by 18 publications

References 30 publications

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

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

Effects of two copper compounds on Microcystis aeruginosa cell density, membrane integrity, and microcystin release

Controlling Lyngbya wollei in three Alabama, USA reservoirs: summary of a long-term management program

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