Sediment Copper Concentrations, In Situ Benthic Invertebrate Abundance, and Sediment Toxicity: Comparison of Treated and Untreated Coves in a Southern Reservoir

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

doi:10.1007/s11270-016-2778-2

Cited by 10 publications

(10 citation statements)

References 34 publications

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“…Except for one cove that received a recent treatment, no difference in sediment total copper concentrations was measured in treated and untreated coves in Lay Lake. In situ benthic invertebrate abundance was also not significantly different between treated and untreated coves (Iwinski et al 2016). Additionally, all treated coves tested have similar or increased survival of Chironomus dilutus and Hyalella azteca in sediment toxicity tests with sampled sediment at different points in time (Calomeni et al 2015;Iwinski et al 2016).…”

Section: Risk Assessment Of Programsmentioning

confidence: 83%

“…In situ benthic invertebrate abundance was also not significantly different between treated and untreated coves (Iwinski et al 2016). Additionally, all treated coves tested have similar or increased survival of Chironomus dilutus and Hyalella azteca in sediment toxicity tests with sampled sediment at different points in time (Calomeni et al 2015;Iwinski et al 2016). Short-term laboratory toxicity studies on sentinel aquatic organisms showed that components of Program 1 may have some impact to larval fish or invertebrates (Johnson et al 2008;Calomeni et al 2015).…”

Section: Risk Assessment Of Programsmentioning

confidence: 83%

“…Critical functions of these systems include recreational activities (e.g., fishing, swimming, boating), economic impact (property values, aesthetics, tourism), anthropogenic uses (potable water source, industrial, irrigation) as well as wildlife habitat (including endangered species). Regimented algaecide applications, often > 5 applications per year, have been used to target infested areas of these systems for over two decades (Iwinski et al 2016). Multiple algaecide treatment programs have been researched and utilized in Lay Lake, Jordan Lake and Lake Mitchell with the goal of decreasing L. wollei biomass to preserve management objectives (Duke 2007;Tedrow 2007;Bishop et al 2015;Calomeni et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Risk Assessment Of Programsmentioning

confidence: 83%

Section: Risk Assessment Of Programsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…band treatments), due to dilution and lateral copper movement. A study by Iwinski et al [27] comparing coves treated ~5 times a year for up to 10 years indicated that a majority of the sites had similar copper concentrations as adjacent untreated coves (p = 0.77, α = 0.05; treated n = 27, mean = 51.6 mg Cu/kg; untreated n = 27, mean = 151.3 mg Cu/kg). In circumstances of repeated or large treatment areas (e.g.…”

Section: Copper Fate From Aquatic Pesticide Applicationsmentioning

confidence: 99%

“…Willis [28] found the copper bioavailability in sediments from an aquaculture pond collected three weeks following a chelated copper algaecide application was inadequate to elicit adverse effects to Hyalella azteca. Iwinski et al [27] found that coves in a lake treated ~5 times a year for up to 10 years lacked measurable adverse effects based on laboratory toxicity experiments and in situ benthic abundance data.…”

Section: Copper Bioavailability and Non-target Risksmentioning

confidence: 99%

Understanding Fate and Effects of Copper Pesticides in Aquatic Systems

Willis¹,

Bishop²

2016

GEP

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Copper sulfate and other chelated or complex copper forms are commonly used to manage nuisance and noxious algae and invasive weeds through direct application to aquatic systems. Regulatory scrutiny and perceived non-target species impacts supported the need for an accurate risk assessment of fate and effects of copper applied as a pesticide. Copper inputs to aquatic systems originate from numerous sources (e.g. natural, storm water, industrial) whereas direct pesticide applications account for approximately 13%. Following a pesticide application, copper rapidly partitions to suspended algae and particulates and the majority (>90%) of applied copper is transferred to sediments within 2 days. Copper subsequently shifts to less bioavailable forms and risks to non-target species are significantly decreased. Additionally, the copper that partitions to sediments is diluted through migration to greater sediments depths and accretion. Even when elevated sediment copper concentrations were measured following chronic applications or high treatment levels, no adverse effects to non-target species were observed with laboratory or field experiments. When used appropriately copper can be an effective tool for water resource managers with negligible environmental impact.

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Sediment quality classification in freshwater lakes predicted by the history of treatment with copper‐based aquatic algaecides

Chen,

Sullivan,

Paul

2024

Integr Envir Assess & Manag

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Copper‐based aquatic algaecides have been widely used in the management of aquatic macrophyte and harmful algal blooms for decades due to their effectiveness and low cost. However, repeated treatment of freshwater lakes results in the accumulation of copper in the sediment, which may adversely affect the ecosystem of the lakes through toxicity to benthic invertebrates and other organisms. Consequently, copper‐based aquatic herbicides and algaecides have been frequently subjected to regulations aimed at preventing further ecological deterioration in treated waterbodies. Many states in the US are taking or considering taking an approach that limits or prohibits copper treatment in waterbodies. Freshwater lakes with extensive historical copper treatments typically have significantly higher concentrations of copper in the sediment than untreated lakes. However, the correlation between the extent of the treatments and level of copper accumulation in the sediment has not been quantitatively characterized. In the present study, between 2006 and 2017, copper concentrations were measured in the sediment from selected lakes in New York State with different histories of copper‐based aquatic algaecide treatment. Analysis of these data confirmed findings from earlier studies conducted by New York State that lakes with histories of copper treatment have significantly higher copper concentrations in the sediment. It also demonstrated that sediment copper concentrations were significantly higher in the sublittoral zone than the littoral zone in treated lakes. Moreover, a positive correlation was detected between sediment copper concentrations and the total number of treatments with copper‐based aquatic algaecide for both littoral and sublittoral zones (p‐value = 7.94 × 10−8 and 3.1 × 10−13, respectively). This relationship can be used as a screening tool for regulatory agencies to identify lakes with sediment copper levels possibly higher than the toxicity threshold for aquatic life. Consequently, additional ecological risk assessment may be required before allowing future treatment with copper‐based aquatic algaecides. Integr Environ Assess Manag 2024;00:1–12. © 2024 SETAC

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Sediment Copper Concentrations, In Situ Benthic Invertebrate Abundance, and Sediment Toxicity: Comparison of Treated and Untreated Coves in a Southern Reservoir

Abstract: Copper-based algaecides are used to control algae that compromise uses of lakes and reservoirs.

Cited by 10 publications

References 34 publications

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

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

Understanding Fate and Effects of Copper Pesticides in Aquatic Systems

Sediment quality classification in freshwater lakes predicted by the history of treatment with copper‐based aquatic algaecides

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