Environmental Pollution最新文献

{"title":"Assessing PAH Contamination in Brazilian Urban Soils: Eco-Friendly Microextraction for Source Identification and Risk Evaluation","authors":"Jhonatan Bispo de Oliveira, Helvécio Costa Menezes, Patterson Patrício de Souza, Zenilda de Lourdes Cardeal","doi":"10.1016/j.envpol.2025.126745","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126745","url":null,"abstract":"Polycyclic aromatic hydrocarbons (PAHs) are considered persistent organic pollutants that have a significant impact on the environment and human health. This study investigates PAH contamination in soils across various land use areas in Divinópolis, Brazil, using a novel analytical approach that integrates direct immersion solid-phase microextraction (DI-SPME) with a hydrophilic microporous cartridge (HMCart) and comprehensive two-dimensional gas chromatography (GC×GC/FID) for enhanced detection and quantification. The HMCart-DI-SPME method combined with GC×GC/FID demonstrated outstanding analytical performance, achieving low detection limits (1.0–6.8 μg kg^-1), high recoveries (93.67–109.67%), and good precision (6.16–15.76% RSD). The ΣPAH ranged from 141.77 to 1133.07 μg kg^-1, with the highest levels observed in industrial areas, surpassing 800 μg kg^-1. Benzo[a]pyrene equivalent (BAPeq) values ranged from 63.95 μg kg-¹ in most samples to 691.79 and 814.40 μg kg^-1 in industrial areas, exceeding the safety threshold of 210 μg kg^-1. Source apportionment analysis revealed a predominance of petrogenic PAHs in commercial and residential areas, whereas industrial areas showed a strong pyrogenic signature, primarily related to fossil fuel combustion and textile industry activities. Isomeric ratios, multivariate analysis and Positive Matrix Factorization (PMF) model confirmed the spatial variation of PAH sources and highlighted the anthropogenic influence on contamination levels. The results emphasize the importance of continuous monitoring of PAH pollution in urban-industrial environments and validate the HMCart approach as a sustainable and effective alternative for forensic environmental analysis.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"53 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term organic fertilization shields soil prokaryotes from metal stress while mineral fertilization exacerbates it","authors":"Aleksandra Pieńkowska ,&nbsp;Jenin Fleischmann ,&nbsp;Sören Drabesch ,&nbsp;Ines Merbach ,&nbsp;Gennuo Wang ,&nbsp;Ulisses Rocha ,&nbsp;Thomas Reitz ,&nbsp;E. Marie Muehe","doi":"10.1016/j.envpol.2025.126747","DOIUrl":"10.1016/j.envpol.2025.126747","url":null,"abstract":"<div><div>Metal contamination in agricultural soils threatens prokaryote dynamics essential for soil health and crop productivity. Yet, whether fertilization in the long-run affects their resilience to metals remains unclear. This study examined the biogeochemical impacts of realistically low-dose applications of cadmium, zinc, and lead in soils subjected to 119 years of non-fertilization, mineral-fertilization (NPK), organic-fertilization (manure), or combined mineral-organic fertilization. Amended metals remained in the mobile fraction with the order: mineral &lt; unfertilized &lt; mineral + organic &lt; organic, mirroring the effects on soil prokaryotes. In both unfertilized and mineral-fertilized soils, 16S rRNA gene copy numbers declined by 30 % upon metal addition, but recovery timing differed: in unfertilized soil, recovery began after three days, whereas in mineral-fertilized soil, numbers declined until day seven before recovering. This coincided with an increase in metal-resistant taxa, particularly in mineral-fertilized soil, with 10 significantly affected OTUs, and to a lesser extent in unfertilized soil, with 5 affected OTUs. Carbon-, nitrogen-, and phosphorus-mining enzyme activities increased 50–100 % in mineral-fertilized soils, suggesting enhanced nutrient acquisition to mitigate metal toxicity. In contrast, organic-fertilized soil hosted stable enzymatic activities and microbial copy numbers with minimal community shifts (1 affected OTU), indicating greater resistance to metal amendment. Combined mineral-organic fertilization stabilized copy numbers and enzymatic activity upon metal amendment, but 8 OTUs were affected, including specialized nutrient cyclers, suggesting increased availability of previously adsorbed NPK cations. Our findings indicate that organic fertilization shields prokaryotes from metal stress, while mineral fertilization exacerbates it, highlighting the benefits of organic practices for maintaining soil health and productivity.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126747"},"PeriodicalIF":7.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accelerated prediction of molecular properties for per- and polyfluoroalkyl substances using graph neural networks with adjacency-free message passing","authors":"Hector Medina,&nbsp;Rachel Drake,&nbsp;Carson Farmer","doi":"10.1016/j.envpol.2025.126705","DOIUrl":"10.1016/j.envpol.2025.126705","url":null,"abstract":"<div><div>The molecular contaminant chemical space is vast, necessitating the development of methods and tools to accelerate the computation of molecular properties, study interactions, and ultimately aid to the engineering of technological solutions for environmental remediation and exposome reduction. Graph neural networks (GNNs) offer a promising approach due to their structural similarity to molecular graphs and their ability to learn complex relationships through graph-based structures. However, GNN-based model training can be computationally expensive, especially for large molecular datasets. In this work, we evaluated the predictive performance of a novel Graph-Enhanced multilayer perceptron (GE-MLP) on molecular properties of per- and polyfluoroalkyl substances (PFAS), and compared it against the performances of two traditional GNN-based architectures, namely Graph Convolutional Networks (GCN) and Graph Attention Networks (GAT). The GE-MLP architecture, which incorporates structural information into a dense neural network framework, was trained on and validated on a dataset of 15,000 PFAS, generated using tight-binding methods, and calibrated against experimental results. The targeted properties were electron affinity (EA), ionization potential (IP), and HOMO–LUMO gap (HL). In contrast to traditional graph-based architectures, GE-MLP offers the advantages of processing molecular fingerprints and node-level descriptors in a purely feedforward manner, embedding structural information using molecular fingerprints and node-level descriptors in place of adjacency-based message passing. Our findings reinforce the usefulness of graph-based architectures in predicting molecular properties of complex contaminants such as PFAS, as compared against traditional machine learning (ML) models. Furthermore, the GE-MLP emerged as a strong GNN-based contender, demonstrating the highest predictive performance for IP, suggesting that integrating structural information via atomic and fingerprint based molecular descriptors into dense neural networks offers a viable alternative to adjacency-based message passing methods. Finally, our GE-MLP provides a computationally efficient alternative to other GNN-based methods due to savings in model training, offering a scalable, message-passing-free approach to molecular property prediction while retaining structural awareness. Future work includes the expansion of the data set to 3.5 million fluorinated compounds to improve generalization, as well as architectural improvements that include transfer learning, topological embeddings, and hybrid models to further advance predictive accuracy and applicability.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126705"},"PeriodicalIF":7.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unsupervised SAM segmentation of zebrafish body: Application to melanin analysis","authors":"Yuan Meng,&nbsp;Jing-Xuan Zhou,&nbsp;Yu-Ting Yang,&nbsp;Xing-Peng Wei,&nbsp;Si-Yu Li,&nbsp;Hong-Gang Ni","doi":"10.1016/j.envpol.2025.126751","DOIUrl":"10.1016/j.envpol.2025.126751","url":null,"abstract":"<div><div>Zebrafish have always been a valuable model for studies on human health. Their transparency makes it highly suitable for observing melanin synthesis. Moreover, their high genetic similarity to humans facilitates the study of human diseases, including pigmentation disorders. However, accurate quantification of melanin in zebrafish is essential for determining the efficacy of inhibitors. This study investigated melanin content in zebrafish exposed to varying concentrations of 1-phenyl 2-thiourea (PTU) and α-Arbutin. To improve the accuracy and reduce the manual effort associated with melanin quantification, we employed the emerging Segment Anything Model (SAM) for unsupervised image segmentation of zebrafish. The model demonstrated high accuracy, achieving 100 % in generating body masks that delineate the zebrafish body and 96.7 % in automatically selecting appropriate masks. Melanin content was then calculated by pixel-level integration within these masks. Overall, melanin synthesis is inhibited with the increase in inhibitor concentration. This approach enables more precise quantification while minimizing manual effort. The proposed method produces quantitative results comparable to existing methods, while offering a simpler and more precise approach.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126751"},"PeriodicalIF":7.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Presence and accumulation of pharmaceutical compounds in agricultural soils receiving six years of biosolids applications","authors":"W. Shu, G.W. Price, K. Khosravi, C.D. Metcalfe","doi":"10.1016/j.envpol.2025.126736","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126736","url":null,"abstract":"The use of biosolids derived from municipal wastewater treatment sewage solids in agriculture has raised concerns regarding the presence and potential accumulation of contaminants of emerging concern (CEC) in soils. This study investigated the influence of six consecutive years of applications of an alkaline treated biosolid (ATB) in an agricultural field on the concentrations of seven pharmaceutical compounds considered as CECs including, carbamazepine (CBZ), caffeine (CAF), dimethylxanthine (DMX), norfloxacin (NOR), gemfibrozil (GEM), diclofenac (DIC), and warfarin (WAR). Soils from a research site receiving annual ATB application rates (0, 14, and 42 Mg ha^-1) over six years (2009-2014) were analyzed for the target pharmaceuticals. Soil samples were analyzed using a combination of accelerated solvent extraction, solid phase extraction (SPE), and liquid chromatography with mass spectrometry (LC-MS). CEC concentrations increased significantly (p &lt; 0.05) with ATB application rate, with CBZ, CAF, and NOR reaching maximum concentrations of 35.2, 41.6, and 47.9 ng g^-1, respectively, in the highest application rate plots. Seasonal changes in CEC concentrations were measured, with an increase directly after application of biosolids but significant reductions at post-harvest. Incremental increases in target CEC concentrations were observed in the soils at the post-application and post-harvest sampling periods over the six years. The findings highlight the need for comprehensive management strategies to mitigate potential risks associated with the presence of biosolids derived CECs in agricultural soils.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"49 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drying-rewetting legacy mitigates freezing-thawing effects on soil microbial communities and greenhouse gas emissions in plateau riparian wetlands","authors":"Lin Ma ,&nbsp;Yongtai Pan ,&nbsp;Hui Liu ,&nbsp;Guihua Liu ,&nbsp;Wenzhi Liu","doi":"10.1016/j.envpol.2025.126753","DOIUrl":"10.1016/j.envpol.2025.126753","url":null,"abstract":"<div><div>Climate change intensifies compound disturbances in soil ecosystems, yet how legacy effects from prior events shape microbial responses to subsequent stresses remains poorly understood. Here, we investigated the legacy effects of drying-rewetting (DW) and freeze-thaw (FT) on greenhouse gas (GHG) emissions and microbial community dynamics across riparian wetlands of the Tibetan Plateau with distinct land-use histories (urban, grazing, and natural). The results showed that urban soils consistently amplified CO₂ emissions compared to grazing and natural lands, whereas natural soils exhibited a pronounced decline in fungal ITS gene abundance, contrasting with the resilience observed in urban and grazing counterparts. Notably, sequential DW-FT perturbations triggered cross-stress mitigation, reducing CO₂ emissions and enriching Actinobacteria—a bacterial phylum negatively correlated with cumulative CO₂ release. Concurrently, DW legacies drove the taxonomic restructuring of fungal communities, favoring the dominance of Ascomycota in natural soils subjected to subsequent FT cycles. Prior DW exposure uniquely amplified the relative abundance of bacterial amplicon sequence variants (ASVs) under FT fluctuations, while standalone FT legacies lacked comparable regulatory capacity. Furthermore, in bacterial co-occurrence networks exposed to two DW cycles, an incomplete cluster emerged, indicating short-term adaptation via compartmentalization. Fungal clusters under FT cycles exhibited simplified co-response patterns but activated mutualism. Our study demonstrates that DW/FT legacy effects on GHG emissions and microbial communities are land-use dependent; DW legacies mitigate FT-induced microbiome disruptions in plateau riparian soils, with fungi showing heightened sensitivity to FT and bacteria displaying adaptability to DW, highlighting taxon-specific responses to compound disturbances.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126753"},"PeriodicalIF":7.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Root and foliar uptake, bidirectional translocation, subcellular distribution, and metabolism of tire wear particle-derived p-phenylenediamines and their quinones in Chinese cabbage and bok choy","authors":"Yan Wang ,&nbsp;Hanyi Li ,&nbsp;Feng Tan ,&nbsp;Ling N. Jin ,&nbsp;Junrong Su ,&nbsp;Chunling Luo","doi":"10.1016/j.envpol.2025.126737","DOIUrl":"10.1016/j.envpol.2025.126737","url":null,"abstract":"<div><div>Tire wear particles (TWPs) and TWP-derived compounds have caused global concern for their toxicity, but their impacts on vegetables, particularly through foliar absorption, remain largely unknown. We investigated the absorption, translocation, accumulation, and metabolism of TWP-derived <em>p</em>-phenylenediamines (PPDs) and PPD-quinones (PPDQs) in hydroponic and soil-cultured leafy vegetables by exposing them to TWPs through roots and leaves. PPDs and PPDQs can be absorbed by vegetables through both roots and leaves, with subsequent bidirectional translocation within vegetables. TWPs with smaller particle sizes and higher aging degrees can release more PPDs and PPDQs, resulting in increased absorptions by the vegetables. Leaves with higher wax secretion, lipid content, and trichome abundance exhibit greater uptake capabilities. PPDs and PPDQs absorbed by leaves can be released back into the environment through roots. The subcellular distribution and translocation of PPDs and PPDQs in vegetables are mainly controlled by their octanol-water partition coefficients with highly hydrophobic congeners primarily accumulating in cell walls and organelles. We screened the 6PPD and 6PPDQ metabolites in leafy vegetables and found that their metabolic processes are influenced by their exposure medium and tissue specificity. The results highlight the risks posed by vegetables absorbing, accumulating, and metabolizing airborne TWP-derived chemicals through their leaves.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126737"},"PeriodicalIF":7.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of per- and polyfluoroalkyl substances exposure on renal dysfunction: Integrating epidemiological evidence with mechanistic insights","authors":"Weitao Su ,&nbsp;Ziwen An ,&nbsp;Yayuan Mei ,&nbsp;Zhenzhen Tan ,&nbsp;Zexuan Jiang ,&nbsp;Xiuli Zeng ,&nbsp;Zhiqiang Dong ,&nbsp;Ming Yang ,&nbsp;Jingtao Wu ,&nbsp;Huicai Guo ,&nbsp;Ang Li","doi":"10.1016/j.envpol.2025.126744","DOIUrl":"10.1016/j.envpol.2025.126744","url":null,"abstract":"<div><div>Renal dysfunction poses a growing global health burden, yet the role of environmental contaminants like per- and polyfluoroalkyl substances (PFAS), particularly their underlying mechanisms, remains understudied. This cross-sectional study included 2801 adults from North China (Shijiazhuang and Baoding City). Plasma concentrations of 21 legacy and alternative PFAS were quantified via ultra-high-performance liquid chromatography-tandem mass spectrometry. Renal function markers (serum creatinine (SCr), serum uric acid (SUA), SUA to SCr ratio (SUA/SCr), blood urea nitrogen (BUN), BUN to SCr ratio (BUN/SCr), estimated glomerular filtration rate (eGFR)) and inflammatory markers were assessed. Multivariable linear regression and quantile g-computation evaluated individual and mixture effects. Receiver operating characteristic (ROC) analysis assessed renal markers’ predictive ability for PFAS. Mediation analysis investigated the role of inflammatory markers, while bioinformatics explored molecular mechanisms. Nine PFAS demonstrated significant associations with elevated SCr, SUA, SUA/SCr, BUN, BUN/SCr, or reduced eGFR. Notably, perfluorooctanesulfonic acid (PFOS) exhibited concurrent associations with SCr, SUA, BUN, and eGFR. PFAS mixtures were linked to increased SCr, SUA, SUA/SCr, BUN, and decreased eGFR. PFOS and perfluorooctanoic acid (PFOA) contributed most to eGFR decline and SUA elevation, respectively. ROC analysis demonstrated superior predictive performance of renal biomarkers for PFOS. Inflammatory markers significantly mediated PFAS (particularly PFOS)-renal dysfunction associations. Bioinformatics implicated lipid metabolism dysregulation and peroxisome proliferator-activated receptor (PPAR) signaling disruption as key mechanisms. In conclusion, PFAS exposure, especially PFOS, was associated with renal dysfunction, mediated primarily by inflammation and lipid metabolism. These findings provide critical mechanistic insights for developing prevention and management strategies against PFAS-associated renal dysfunction.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126744"},"PeriodicalIF":7.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term exposure to major constituents of PM2.5 and executive function among children and adolescents in China","authors":"Hua-Lian Chen ,&nbsp;Qing-Guo Zeng ,&nbsp;Jing Wei ,&nbsp;Qiong Zhang ,&nbsp;Hui-Xian Zeng ,&nbsp;Katja Kanninen ,&nbsp;Bin Jalaludin ,&nbsp;Jian Dai ,&nbsp;Yuan Lv ,&nbsp;Bin Zhao ,&nbsp;Pasi Jalava ,&nbsp;Guang-Hui Dong ,&nbsp;Xiao-Wen Zeng","doi":"10.1016/j.envpol.2025.126740","DOIUrl":"10.1016/j.envpol.2025.126740","url":null,"abstract":"<div><div>Epidemiological evidence regarding the effects of long-term exposure to fine particulate matter (PM_2.5) constituents on executive function (EF) in children and adolescents is limited. This cross-sectional study analyzed 67,622 children and adolescents aged 5–18 from China (2020–2021) and calculated the five-year average concentrations of PM_2.5 and its six constituents using the ChinaHighAirPollutants (CHAP) dataset. EF was assessed using the parent-completed Behavioral Rating Inventory of Executive Function (BRIEF). Generalized linear mixed models and weighted quantile sum regression were applied to evaluate the potential effects of individual PM_2.5 components and their mixtures. Long-term exposure to PM_2.5 and its components was linked to poorer EF (e.g., global executive composite (GEC) and metacognition index). For example, compared with the lowest quartile, the highest quartiles of PM_2.5 components were linked to higher risks for GEC dysfunction (e.g., odd ratio (OR) was 1.23 (1.05, 1.44) for ammonium (NH₄⁺), 1.14 (1.01, 1.29) for organic matter (OM) and 1.18 (1.05, 1.32) for black carbon (BC)). Similarly, joint exposure to PM_2.5 constituents was related to GEC dysfunction (OR = 1.08 (1.03, 1.13)), with BC and NH₄⁺ contributing more significantly to the association. Additionally, children under 12 years and those with parental education levels below high school appear to be more susceptible to the effects of PM_2.5 constituents. In conclusion, the reduction of combustion-related BC and NH₄⁺ may reduce the burden of PM_2.5-related executive dysfunction in children and adolescents.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126740"},"PeriodicalIF":7.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deciphering the roles of abundant and rare microbial taxa in the natural restoration of organically contaminated urban river sediments","authors":"Bin Wang ,&nbsp;Qian Chen ,&nbsp;Weihang Liang ,&nbsp;Suyun Chang ,&nbsp;Jingmei Sun","doi":"10.1016/j.envpol.2025.126741","DOIUrl":"10.1016/j.envpol.2025.126741","url":null,"abstract":"<div><div>Understanding the distinct roles of rare (RT) and abundant taxa (AT) during the natural restoration of organic contaminated urban river sediments is crucial for optimizing bioremediation. This study investigated their distribution, assembly mechanisms, co-occurrence patterns, and functional traits across sediment pollution gradients. Results revealed that AT dominated in sequence abundance but comprised fewer OTUs, while RT exhibited higher α-diversity and broader niche width, underpinning community stability under pollution stress. Stochastic processes dominated community assembly, with dispersal limitation primarily shaping AT and ecological drift influencing RT. Functionally, AT drove pollutant transformation and energy metabolism, whereas RT displayed elevated metabolic activity supporting microbial growth. Critically, RT demonstrated superior xenobiotic biodegradation in severely polluted sediments, highlighting their specialized role in extreme conditions. Co-occurrence network emphasized RT's importance in maintaining complex microbial interactions, though network stability decreased with pollution. These findings demonstrate that AT and RT synergistically drive organic matter degradation, with RT uniquely contributing to pollutant breakdown and ecosystem stability under high pollution stress. This study provides insights into leveraging both taxa for optimized bioremediation strategies in contaminated sediments.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"382 ","pages":"Article 126741"},"PeriodicalIF":7.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}