Environmental Chemistry and Ecotoxicology最新文献

{"title":"The blockage of the electron transport chains caused by PFOA isomers induced metabolic damage of Arabidopsis leaves","authors":"Hao Wang ,&nbsp;Jianxiong Mei ,&nbsp;Zeying He ,&nbsp;Bingjie Liu ,&nbsp;Jishi Wang ,&nbsp;Yue Geng ,&nbsp;Yanwei Zhang","doi":"10.1016/j.enceco.2025.02.006","DOIUrl":"10.1016/j.enceco.2025.02.006","url":null,"abstract":"<div><div>Different metabolic damage could be caused by PFOA isomers, although the harm mechanism has not been well studied. The effects of PFOA isomers on Arabidopsis metabolism were investigated using metabolomics, proteomics and molecular docking. Compared to Pn (linear PFOA), P3 (3 - methyl - perfluoroheptanoic acid, P3MHpA) induced a greater amount of oxidative damage and more dysregulation proteins. Both PFOA isomers caused significant metabolic disorders in oxidative stress and photosynthetic dysregulation, and they happened in similar molecular components including chloroplast and thylakoids. Proteins were more readily bound by ionic PFOA, and P3 exhibited higher ability than Pn. Isomers of the ionic PFOA bound to proteins in photosynthesis, particularly the ETC proteins, leading to a blockage of the electron transport chains in the chloroplast, which induced oxidative stress and photosynthetic toxicity. This study provides a novel and important mechanism for the photosynthetic toxicity of different PFOA isomers.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 516-526"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbendazim led to neurological abnormalities by interfering metabolic profiles in zebrafish brain after short-term exposure","authors":"Tiancai Wang ,&nbsp;Zishuang Wang ,&nbsp;Guangqin Liao ,&nbsp;Xiabing Li ,&nbsp;Jingyi Gu ,&nbsp;Jing Qiu ,&nbsp;Yongzhong Qian","doi":"10.1016/j.enceco.2024.12.001","DOIUrl":"10.1016/j.enceco.2024.12.001","url":null,"abstract":"<div><div>Carbendazim is an agricultural fungicide and a widely present ecotoxic pollutant, but its damaging effects on the nervous system are not fully understood. Here, we assessed effects of short-term exposure to carbendazim on zebrafish brains. It has been revealed firstly that carbendazim can accumulate in the brain after a 7-day exposure, with the maximum concentration of 68.22 ± 9.84 μg/kg, which caused tissue vacuolization and neuronal damage, then led to a decline in motor behavioral abilities, especially a significant reduction in the distance moved. These changes may be attributed to metabolism abnormalities. Based on metabolomics and lipidomics, substantial alterations were observed in 264 lipids and 135 metabolites, with notable enrichment in 5 metabolic pathways, including glycerophospholipid metabolism, glycerolipid metabolism, and sphingolipid metabolism. To investigate system-level variations, weighted correlation network analysis was utilized to screen for 4 biomarkers strongly associated with carbendazim exposure: citric acid, guanosine-5′-monophosphate, sphingosine, and monoacylglycerol. The alterations of these markers confirmed damages of carbendazim to zebrafish nervous system, further elucidating that metabolic disorders caused by carbendazim in brains led to tissue damage and subsequent changes in motor behavior. This study provides scientific evidence for neurotoxicities of carbendazim and offers new insights into ecological risks.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 164-173"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enrichment features, ecological risks assessment and quantitative sources appointment of sediment heavy metals: An example of the urbanized Xizhi River catchment, South China","authors":"Chao Yan ,&nbsp;Qirui Wu ,&nbsp;Rui Li ,&nbsp;Zuobing Liang ,&nbsp;Zaizhi Yang ,&nbsp;Aiping Zhu ,&nbsp;Lei Gao","doi":"10.1016/j.enceco.2025.01.002","DOIUrl":"10.1016/j.enceco.2025.01.002","url":null,"abstract":"<div><div>Rapid industrialization is typically the primary cause for heavy metals [HMs: copper (Cu), zinc (Zn), cadmium (Cd), chromium (Cr), nickel (Ni), and lead (Pb)] contamination in urbanized river basins. In this study, sediment cores were collected from the Xizhi River (XZR) of the Pearl River Delta, South China, and its tributary, the Danshui River (DSR), to analyze the total concentrations and geochemical fractions of these HMs and to assess their potential hazards to the river ecosystem. By integrating a traditional geochemical model and multivariate statistical analysis into a positive matrix factorization (PMF) method, we quantitatively identified the possible sources of HM contamination in the sediments. The total concentrations of sediment HMs distinctly exceeded local background values and were higher in the DSR compared to the XZR. The enrichment levels of HMs were influenced not only by sediment properties, such as texture, but also, more critically, by the distribution of contamination sources. Sediment Cu, Zn, Cd, and Ni were dominated by acid-soluble fractions (31.4–56.2 %), exhibiting a great mobility potential; while reducible and oxidizable fractions were the predominant geochemical forms for Pb (45.0 ± 12.8 %) and Cr (37.3 ± 7.09 %). Based on the geo-accumulation index and enrichment factor of individual metals, contamination levels decreased in the order of Cd &gt; Cu, Zn, and Ni &gt; Cr and Pb. Sediment Cd was identified as the major contributor to the potential ecological risks posed to aquatic species. Across the entire watershed, the main sources of HM contamination were identified as industrial effluents (54 %), agrochemicals (16 %), domestic sewage (14 %), and weathering of parent rocks (16 %).</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 263-274"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The multifaceted power of biochar: A review on its role in pollution control, sustainable agriculture, and circular economy","authors":"Amreen Bano ,&nbsp;Mohd Kashif Aziz ,&nbsp;Bablu Prasad ,&nbsp;Rajesh Ravi ,&nbsp;Maulin P. Shah ,&nbsp;Pollyanna Vanessa Dos Santos Lins ,&nbsp;Lucas Meili ,&nbsp;Kumar Suranjit Prasad","doi":"10.1016/j.enceco.2025.01.004","DOIUrl":"10.1016/j.enceco.2025.01.004","url":null,"abstract":"<div><div>The key challenges of the 21st century include global warming, soil health management, wastewater treatment, and adopting sustainable green technologies. Biochar offers significant potential in addressing these issues, positioning itself as a vital tool in advancing sustainable development goals. Recent biochar research has expanded significantly beyond its traditional focus in agricultural and environmental sciences. These characteristics position biochar as an increasingly valuable material for improving soil health, enhancing agricultural productivity, and capturing atmospheric carbon dioxide, contributing to efforts to mitigate global warming. The “circular economy” concept is rapidly gaining attraction, driven by its central goal of waste elimination through meticulous planning. Recently, biochar has emerged as a significant contributor in the environmental community due to its versatility in reducing waste and enhancing the efficacy of the circular economy. This review delves into advancements in the production, modification, and treatment methods of biochar, as well as its elemental and nutrient composition. It highlights the advantages, challenges, and diverse applications of biochar while critically examining current challenges and research gaps in its potential to mitigate greenhouse gas emissions, enhance soil carbon sequestration, and improve wastewater treatment processes.The potential of biochar to reduce greenhouse gas emissions and sequester carbon in soils, along with its applications in wastewater treatment, are thoroughly covered in this article. The challenges it faces and its prospects are also discussed in detail. This review identifies the key issues that must be addressed for the sustainable utilization of biochar. It explores the development of a circular economy-based environmental management paradigm, leveraging waste conversion into biochar and its diverse applications across regions, thus effectively closing the loop and exemplifying a truly circular economy in action.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 286-304"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accumulation of thallium and potential toxic elements in a water-soil-rice system from a pyrite mining area, southern China: Source apportionment and health risk assessment","authors":"Zhiyi Song ,&nbsp;Hongmei Deng ,&nbsp;Zezhi Chen ,&nbsp;Tao Liu ,&nbsp;Tangfu Xiao","doi":"10.1016/j.enceco.2025.02.003","DOIUrl":"10.1016/j.enceco.2025.02.003","url":null,"abstract":"<div><div>Contamination of heavy metals in the arable soil around mining areas has become a hot issue of global concern, relating to food security and human health risks. This study investigates the accumulation of thallium (Tl) and six other potential toxic elements (PTEs) (Pb, Cu, Cd, As, Ni, Zn) in irrigation water, rhizosphere soil, and corresponding rice grain samples collected from the region downstream of pyrite mining areas, southern China. Surface water in this area might be under the influence of sewage discharge from pyrite mines, with irrigation water exhibiting elevated Tl, Cd, and Zn contents of 26.22, 10.43, and 18,275 μg/L respectively. As a result, 67 %, 78 % and 44 % of rice samples exceeded food safety standards for As, Pb, and Cd respectively. Positive matrix factorization (PMF) modeling revealed that, irrigation activities account for 27.1 % target contaminates accumulation in paddy lands. Although the Tl concentrations in rice grains were relatively low (ranging from 0.01 to 0.06 mg/kg), the substantial consumption of rice, as the staple food, posed significant health risks for local residents (<em>HQ</em> &gt; 16 for adults and &gt; 12 for children, respectively). This study provides a theoretical basis for understating the contribution of irrigation to PTEs contamination in paddy fields in downstream mining-affecting regions. These findings are crucial for developing strategies to mitigate heavy metals contamination, selecting appropriate soil remediation methods, and reducing ecological and health risks.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 407-416"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of low molecular weight organic acids on adsorption of Cd(II) by Auricularia auricula spent substrate-derived biochar: Types and reaction sequence","authors":"Xuesheng Liu ,&nbsp;Yue Jiang ,&nbsp;Wei Yang ,&nbsp;Sha Li ,&nbsp;Yu Jin ,&nbsp;Juanjuan Qu ,&nbsp;Wei Wang","doi":"10.1016/j.enceco.2024.09.001","DOIUrl":"10.1016/j.enceco.2024.09.001","url":null,"abstract":"<div><div>Cadmium (Cd) is one of the most mobile and toxic heavy metals that seriously deteriorates crop quality and threatens human health. It is considered an effective means to stabilize Cd in soil and reduce plant uptake by the application of biochar. However, the interactions and mechanisms between biochar and Cd in the rhizospheric soil are blurred due to the involvement of low molecular weight organic acids (LMWOAs). In this study, four different reaction sequences were established to simulate the chemical interactions between LMWOAs and cadmium (Cd) in the rhizospheric soil with biochar. In terms of adsorption patterns, the results show that, LMWOAs not only slow down the adsorption of Cd ions onto biochar, but also desorb the adsorbed Cd ions from biochar. Tartaric acid (TA) makes adsorption easier, while citric acid (CA) and malic acid (MA) make it more difficult. In terms of adsorption mechanism, the functional groups of MA and CA on biochar the vary wtih reaction sequence, thereby affecting the Cd adsorption onto biochar. The functional groups of TA participate in the adsorption to the greatest extent, and its impact on adsorption is rarely influenced by the reaction sequence. The reaction sequence does not affect the types of Cd-crystals, but affects dissolvement or attachment to the surface of biochar. This study provides chemical insights for further understanding the impact of LMWOAs on the interaction between biochar and heavy metals in soil.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 154-163"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling the pervasive influence of brominated flame retardants on reproductive and developmental outcomes: A systematic review","authors":"Jiahua Meng ,&nbsp;Zitong Zhang ,&nbsp;Jiaqi Tian ,&nbsp;Ning Li ,&nbsp;Zhen Chen ,&nbsp;Xiang Yun ,&nbsp;Dandan Song ,&nbsp;Fei Li ,&nbsp;Lin Zhang","doi":"10.1016/j.enceco.2025.01.006","DOIUrl":"10.1016/j.enceco.2025.01.006","url":null,"abstract":"<div><div>Brominated flame retardants are a class of chemical flame retardants containing bromine elements. Widely used in various consumer products to reduce fire hazards. However, the ubiquitous presence of BFRs in the environment and their potential to bioaccumulate in human tissues have raised concerns about their reproductive and developmental toxicity. This comprehensive review synthesizes the current epidemiological, in vivo, and in vitro evidence regarding the effects of both traditional and novel BFRs on reproductive and developmental health outcomes, where epidemiological studies have linked BFRs exposure to adverse neurodevelopmental, perinatal, and reproductive health consequences, while animal studies provide further insights into the impact of BFRs on parental and offspring health across mammalian and non-mammalian species. Cellular and molecular investigations have unraveled the mechanisms underlying BFRs-induced toxicity, including germ cell and zygote vulnerability, testicular toxicity, sperm quality alterations, and placental dysfunction. Furthermore, the interactive effects of BFRs with other environmental contaminants such as heavy metals, Polychlorinated Biphenyls, methylmercury, and Polyfluoroalkyl Substances have also been explored, which highlights the importance of mixture toxicology in assessing the risks associated with BFRs exposure. Despite the growing body of evidence, limitations in current research and challenges in extrapolating findings to human health risk assessment are discussed, along with recommendations for future research directions and risk management strategies. Based on which this review provides a comprehensive foundation for understanding the reproductive and developmental toxicity of BFRs and underscores the need for proactive measures to mitigate their adverse health effects and protect vulnerable populations.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 319-338"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics and source apportionment of methylated polycyclic aromatic hydrocarbons in sediments of reservoirs from the Qiantangjiang River, Wujiang River, and Pearl River","authors":"Tong Li ,&nbsp;Xiao-Ying Li ,&nbsp;Jun-Kang Ni ,&nbsp;Fu-Shun Wang ,&nbsp;Xue-Ping Chen ,&nbsp;Jing Ma ,&nbsp;Zi-Feng Zhang","doi":"10.1016/j.enceco.2025.02.008","DOIUrl":"10.1016/j.enceco.2025.02.008","url":null,"abstract":"<div><div>Methylated polycyclic aromatic hydrocarbons (MePAHs) pose more toxicity and persistence than their parent compounds, yet their contamination levels in reservoir sediments remain poorly understood. We analyzed 44 MePAHs in 72 surface and 199 core sediment samples from three watersheds in China: Qiantangjiang River (QTJ), Wujiang River (WJ), and Pearl River (PR). Total MePAH concentrations (ΣMePAHs) ranged from 19.7 to 1270 ng/g, with methylnaphthalenes and methyl phenanthrenes dominating. Temporally, the ΣMePAHs of surface sediments showed a pattern of dry season (340 ± 250 ng/g) &gt; wet season (303 ± 189 ng/g). Spatially, the ΣMePAHs of surface sediments showed a pattern of WJ (444 ± 235 ng/g) &gt; QTJ (253 ± 133 ng/g) &gt; PR (199 ± 161 ng/g). ΣMePAHs were higher in the surface sediments, and sediment cores of the reservoirs upstream than downstream (383 ± 261 ng/g &gt; 233 ± 113 ng/g, 340 ± 114 ng/g &gt; 105 ± 43.5 ng/g, respectively), and ΣMePAHs varied with the depth of the sediment cores. Notable disparities in component profiles were evident between QTJ and PR sites at various locations, whereas WJ exhibited homogeneity in its component distribution. Spatial and temporal variations revealed unique patterns influenced by diverse sources and environmental factors. TOC was the main factor affecting MePAH concentrations. The influence of hydrological factors on MePAHs pollution in sediments outweighed that of social factors. MePAH isomers that replace methyl groups at specific positions (1,2 or 4-position) were present in much higher concentrations than other isomers in sediment. These findings deepen our understanding of MePAHs pollution in reservoir sediments and are instrumental in crafting effective pollution control strategies.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 445-452"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evidential-bio-inspired algorithms for modeling groundwater total hardness: A pioneering implementation of evidential neural network for feature selection in water resources management","authors":"Abdullahi G. Usman ,&nbsp;Abdulhayat M. Jibrin ,&nbsp;Sagiru Mati ,&nbsp;Sani I. Abba","doi":"10.1016/j.enceco.2025.02.012","DOIUrl":"10.1016/j.enceco.2025.02.012","url":null,"abstract":"<div><div>Accurate prediction of total hardness (TH) in groundwater is essential for ensuring its suitability for domestic, industrial, and agricultural use. Traditional methods often fail to capture the complex non-linear relationships that characterize water quality data, necessitating more advanced modeling techniques. In this study, three modeling schema batches were developed based on sensitivity analysis results using Evidential Neural Network (EVNN); Batch 1 (B1) include all the parameters, Batch 2 (B2) comprised of electrical conductivity (EC), residual sodium carbonate (RSC), calcium (Ca), chloride (Cl), magnesium (Mg), and nitrate (NO3), while Batch 3 (B3) composed of sulfate (SO4), sodium (Na), bicarbonate (HCO3), sodium adsorption ratio (SAR), potassium (K), groundwater level (GWL), Fluoride (F), pH, and carbonate (CO3) for modeling TH. The dataset was split into a 70:30 ratio for calibration and validation phases, respectively. The sensitivity analysis was subsequently enhanced by bio-inspired algorithms, to predict TH in groundwater, with a specific focus on optimizing feature selection. Sensitivity analysis identified key input features such as EC, RSC, Ca, and Mg as the most influential parameters. The EVNN, coupled with bio-inspired optimization algorithms, specifically the Firefly Algorithm (FA), Invasive Weed Optimization (IWO), and Anti-Bee Colony Optimization (ABC), achieved superior predictive accuracy compared to COVID optimization algorithm (COA). The EVNN-FA-ANN-B2 combination, particularly when using a refined set of features, demonstrated exceptional performance, with a coefficient of determination (R²) of 1.000 and RMSE close to zero. On the other hand, the EVNN-COA-ANN-B1 model exhibited the lowest accuracy, with an R² of 0.028 and an RMSE of 309.117. This research presents a novel, efficient, and reliable framework for predicting TH in groundwater, offering practical implications for water quality management, especially in regions where high TH levels pose significant challenges.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 494-505"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling the association between the El Niño Southern Oscillation and levels of legacy pollutants in Alaskan seabird eggs from 1999 to 2010","authors":"Caitlin A. McConaghy ,&nbsp;Vrinda Kalia ,&nbsp;Amina Salamova ,&nbsp;Lance A. Waller ,&nbsp;Matthew O. Gribble","doi":"10.1016/j.enceco.2024.11.004","DOIUrl":"10.1016/j.enceco.2024.11.004","url":null,"abstract":"<div><h3>Background</h3><div>The circumpolar north has long been a sink for legacy persistent organic pollutants (POPs). Under a warmer climate, these contaminants are predicted to remobilize within environmental media where they are subject to climate processes, underscoring the need to examine the effects of large-scale climate oscillations on the fate of legacy POPs.</div></div><div><h3>Methods</h3><div>We apply piecewise log-linear spline regression models with non-parametric bootstrapping to measure the association between the El Niño Southern Oscillation (ENSO), a measure of Pacific sea surface temperature variability, and levels of polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), and polybrominated diphenyl ethers (PBDEs) measured in common murre (<em>Uria aalge</em>) and thick-billed murre (<em>Uria lomvia)</em> eggs collected from the Gulf of Alaska and Bering Sea between 1999 and 2010.</div></div><div><h3>Results</h3><div>In thick-billed murres, average PCB concentrations increased 143 % per unit increase in ONI during the warm phase of the ENSO, with a meta-regression pooled estimate of 0.887 (95 % CI: 0.674, 1.099). Similarly, average PBDE concentrations increased 562 % per unit increase in ONI during the warm phase, with a pooled estimate of 1.890 (95 % CI: 0.647, 3.133). During the cool phase, average PCB concentrations decreased 59 % per unit increase in ONI, with a pooled estimate of −0.892 (95 % CI: −1.400, −0.384). In common murres, average PCB concentrations decreased 51.4 % per unit increase in ONI during the warm phase, with a meta-regression pooled estimate of −0.722 (95 % CI: −0.894, −0.549), and increased 39.5 % per unit increase in ONI during the cool phase, with a pooled estimate of 0.333 (95 % CI: 0.185, 0.481). Average PBDE concentrations decreased 79.2 % per unit increase in ONI during the warm phase, with a pooled estimate of −1.572 (95 % CI: −2.357, −0.787).</div></div><div><h3>Conclusion</h3><div>Our results indicate associations between the ENSO and PCB and PBDE loads in Alaskan murre eggs, suggesting the ENSO may be an important factor in the fate of legacy POPs within Alaskan marine food webs. To our knowledge, this is the first paper to link the ENSO and levels of legacy POPs in Alaska's environment and may be relevant to health and food security in this region.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 174-181"},"PeriodicalIF":9.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}