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

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Integrated Environmental Assessment and Management Pub Date : 2024-02-14 DOI:10.1002/ieam.4901

Yu Chen, Patrick J. Sullivan, Eric Paul

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Abstract

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;20:1586–1597. © 2024 SETAC

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根据铜基水生灭藻剂处理历史预测淡水湖沉积物质量分类。

几十年来，以铜为基础的水生杀藻剂因其效果好、成本低而被广泛用于治理水生大型藻类和有害藻类水华。然而，反复处理淡水湖会导致铜在沉积物中积累，从而对底栖生物和其他生物产生毒性，对湖泊生态系统造成不利影响。因此，铜基水生除草剂和灭藻剂经常受到监管，以防止经过处理的水体生态环境进一步恶化。美国许多州正在采取或考虑采取限制或禁止在水体中进行铜处理的方法。历史上进行过大量铜处理的淡水湖泊，其沉积物中的铜浓度通常明显高于未经处理的湖泊。然而，处理范围与沉积物中铜积累水平之间的相关性尚未得到定量描述。在本研究中，2006 年至 2017 年期间，对纽约州部分湖泊的沉积物中的铜浓度进行了测量，这些湖泊具有不同的铜基水生灭藻剂处理历史。对这些数据的分析证实了纽约州早期研究的结果，即有过铜处理历史的湖泊沉积物中的铜浓度明显更高。研究还表明，在经过铜处理的湖泊中，沉积物中的铜浓度在近岸区明显高于沿岸区。此外，在沿岸带和近岸带，沉积物中的铜浓度与使用铜基水生灭藻剂的总次数之间存在正相关关系（p 值分别为 7.94 × 10-8 和 3.1 × 10-13）。这种关系可用作监管机构的筛选工具，以确定沉积物铜含量可能高于水生生物毒性阈值的湖泊。因此，在允许未来使用铜基水生杀藻剂进行处理之前，可能需要进行额外的生态风险评估。Integr Environ Assess Manag 2024;00:1-12.© 2024 SETAC.

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来源期刊

Integrated Environmental Assessment and Management ENVIRONMENTAL SCIENCESTOXICOLOGY&nbs-TOXICOLOGY

CiteScore

5.90

自引率

6.50%

发文量

156

期刊介绍： Integrated Environmental Assessment and Management (IEAM) publishes the science underpinning environmental decision making and problem solving. Papers submitted to IEAM must link science and technical innovations to vexing regional or global environmental issues in one or more of the following core areas: Science-informed regulation, policy, and decision making Health and ecological risk and impact assessment Restoration and management of damaged ecosystems Sustaining ecosystems Managing large-scale environmental change Papers published in these broad fields of study are connected by an array of interdisciplinary engineering, management, and scientific themes, which collectively reflect the interconnectedness of the scientific, social, and environmental challenges facing our modern global society: Methods for environmental quality assessment; forecasting across a number of ecosystem uses and challenges (systems-based, cost-benefit, ecosystem services, etc.); measuring or predicting ecosystem change and adaptation Approaches that connect policy and management tools; harmonize national and international environmental regulation; merge human well-being with ecological management; develop and sustain the function of ecosystems; conceptualize, model and apply concepts of spatial and regional sustainability Assessment and management frameworks that incorporate conservation, life cycle, restoration, and sustainability; considerations for climate-induced adaptation, change and consequences, and vulnerability Environmental management applications using risk-based approaches; considerations for protecting and fostering biodiversity, as well as enhancement or protection of ecosystem services and resiliency.

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