Environment International最新文献

{"title":"Unraveling the origins of mobile antibiotic resistance genes using random forest classification of large-scale genomic data","authors":"Stefan Ebmeyer ,&nbsp;Erik Kristiansson ,&nbsp;D. G. Joakim Larsson","doi":"10.1016/j.envint.2025.109374","DOIUrl":"10.1016/j.envint.2025.109374","url":null,"abstract":"<div><div>Understanding in which environments and under what conditions chromosomal antibiotic resistance genes (ARGs) acquire increased mobility is crucial to effectively mitigate their emergence in and dissemination among pathogens. In order to identify the conditions and environments facilitating these processes, it is valuable to know from which bacterial species mobile ARGs were mobilized initially, before their dissemination to other species. In this study, we used data generated from &gt; 1.5 million publicly available bacterial genome assemblies to train a random forest classifier to identify the origins of mobile genes. Analysis of the models’ predictions revealed the previously unknown origins of 12 mobile ARG groups, which confer resistance to 4 different classes of antibiotics. This included ARGs conferring resistance to tetracyclines, an antibiotic class for which, to the best of our knowledge, no recent origins of ARGs have previously been convincingly demonstrated. All identified origin species in this study are known opportunistic pathogens, and some are the origin of multiple mobile ARGs. An analysis of public metagenomes from different sources indicates that most of the origin species are particularly abundant in municipal wastewaters, a few were highly abundant in animal feces and three were most common in environments polluted with waste from antibiotic manufacturing. This study highlights environments where these origin species thrive and where there is a need for limiting antibiotic selection pressures.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109374"},"PeriodicalIF":10.3,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hyperspectral remote sensing for air pollutants: Stereoscopic monitoring, source localization & warning, and a dynamic emission inventory concept","authors":"Chengzhi Xing ,&nbsp;Haochen Peng ,&nbsp;Cheng Liu ,&nbsp;Qihua Li ,&nbsp;Zhijian Tang ,&nbsp;Wei Tan ,&nbsp;Haoran Liu ,&nbsp;Qianqian Hong","doi":"10.1016/j.envint.2025.109375","DOIUrl":"10.1016/j.envint.2025.109375","url":null,"abstract":"<div><div>With the continuous improvement of air quality in China, the characteristics of emission sources of pollutants have changed significantly, from their distribution to emitted atmospheric species and the corresponding emission concentrations and source localization has become increasingly challenging. The localization uncertainties of in situ observations are further amplified when combined with model simulations, which seriously restricts the realization of China’s strategic goal of “reducing pollution and carbon.” In this study, we established a localization and emission warning scheme for emission sources based on various hyperspectral remote sensing techniques with different observation spatial resolutions. These include satellite remote sensing, horizontal remote sensing, Unmanned Aerial Vehicle (UAV) remote sensing, and imaging. Based on this study, we aimed to locate high-concentration emission sources of NO₂ (coal-fired power plants), HCHO (chemical and coking industries), and CH₂CCH₃CHO (metallurgical and material synthesis industries) and provide excess emission warnings for these species. Moreover, hyperspectral imaging remote sensing technology provides a possible method to obtain a dynamic emission inventory of pollutants, and the emission concentrations of NO₂, SO₂, HCHO, CHOCHO, and CH₂CCH₃CHO emitted from the coking industry at different timescales were obtained. The localization and emission warning scheme of pollutants established based on stereoscopic remote sensing, as well as the dynamic emission inventory established based on hyperspectral imaging remote sensing, provides technical and data support for air pollution control efforts.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109375"},"PeriodicalIF":10.3,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fetal exposure to perfluoroalkyl substances (PFAS) in drinking water and congenital malformations: A nation-wide register-based study on PFAS in drinking water","authors":"Melle Säve-Söderbergh ,&nbsp;Irina Gyllenhammar ,&nbsp;Tessa Schillemans ,&nbsp;Emelie Lindfeldt ,&nbsp;Carolina Vogs ,&nbsp;Carolina Donat-Vargas ,&nbsp;Emma Halldin Ankarberg ,&nbsp;Anders Glynn ,&nbsp;Lutz Ahrens ,&nbsp;Emilie Helte ,&nbsp;Agneta Åkesson","doi":"10.1016/j.envint.2025.109381","DOIUrl":"10.1016/j.envint.2025.109381","url":null,"abstract":"<div><h3>Background</h3><div>Teratogenic properties of perfluoroalkyl substances (PFAS) have been assessed in a few studies, however, epidemiological evidence for an association is inconclusive.</div></div><div><h3>Objectives</h3><div>We conducted a Swedish nation-wide register-based cohort study to assess the associations of estimated fetal exposure to the sum of drinking water perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA) and perfluorohexane sulfonic acid (PFHxS) with major congenital malformations.</div></div><div><h3>Methods</h3><div>We included all births in Sweden during 2012–2018 of mothers residing ≥four years prior to <em>partus</em> in localities served by municipal drinking water where PFAS concentrations have been measured in drinking water. We estimated the fetal PFAS4 exposure by using a one-compartment toxicokinetic model – including maternal residential history, municipal PFAS water concentration and year-specific PFAS maternal background concentrations as input data – and accounting thereafter PFAS-specific transplacental transfer factors to estimate the fetal PFAS4 exposure. By register linkage we obtained birth outcomes and covariates. Odd ratios (OR) and 95 % confidence intervals (CI) of the associations between estimated PFAS in foetuses and major congenital malformations were estimated by logistic regressions and, complementary, by quantile g-computation regression for mixture effects.</div></div><div><h3>Results</h3><div>Analyses of 256,659 newborns of which 5,357 were diagnosed with major congenital malformations, revealed associations between fetal PFAS4 exposure and malformations on the nervous system OR, 2.84 (95 % CI: 1.38–5.84, p-trend: 0.008) and chromosomal anomalies OR, 1.50 (95 % CI: 1.07–2.10, p-trend: 0.009) comparing extreme quartiles. For the individual PFAS and in the quantile g-computation model, there were indications of an association between PFAS and urinary defects, OR 1.96 (95 % CI: 1.59–2.43, p-trend mixed effect: &lt;0.001), primarily driven by PFOA and PFHxS.</div></div><div><h3>Discussion</h3><div>Modelled fetal sum of PFAS4 was associated with malformations of the nervous system and chromosomal anomalies, while the mixture assessment revealed associations with defects on urinary system. As the underlying toxicological mechanisms remains unclear, further investigation is warranted.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109381"},"PeriodicalIF":10.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics and influencing factors of microplastics entering human blood through intravenous injection","authors":"Bowen Li ,&nbsp;Min Li ,&nbsp;Dongwei Du ,&nbsp;Bin Tang ,&nbsp;Wenwen Yi ,&nbsp;Miaoni He ,&nbsp;Ruijuan Liu ,&nbsp;Hairui Yu ,&nbsp;Yunjiang Yu ,&nbsp;Jing Zheng","doi":"10.1016/j.envint.2025.109377","DOIUrl":"10.1016/j.envint.2025.109377","url":null,"abstract":"<div><div>The presence of microplastics in the human body and their potential health risks have drawn widespread attention in recent years. Microplastics have been detected in human blood, though their pathways of entry remain unclear. This study employed Raman spectroscopy and energy dispersive spectroscopy to evaluate the microplastic release characteristics of intravenous medical devices, aiming to investigate the influencing factors and the risk of microplastics entering the bloodstream. The results showed that microplastics were found in three widely-used medical devices, with abundances ranging from 0.44 to 2.00 items/n. Polyethylene, polypropylene (46.2 %), fragments (96.7 %), and white (86.8 %) were the predominant characteristics. Factors such as brand, specifications, and usage scenarios influence microplastic release, leading to differences in detection rates among different medical devices (0–100%). Repeated use significantly increases the risk of microplastic release (<em>p</em> &lt; 0.05). Notably, built-in filtration membranes do not completely retain microplastics and may pose a risk of shedding fibers themselves. Using the exposure assessment model, the estimated microplastic release per person per year was 3.75 items for syringe, 6.22 items for infusion set, and 0.35 items for vein detained needle. Overall, although the amount of microplastics entering the human body through intravenous injection is significantly lower than that from dietary exposure and other pathways, the risk of direct entry into the bloodstream remains a concern. This research provides critical evidence for understanding the direct pathways and risks of microplastic exposure in human blood from plastic medical devices, offering significant scientific value for assessing exposure pathways and the safety of medical device use.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109377"},"PeriodicalIF":10.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards compliance with the 2021 WHO air quality guidelines: A comparative analysis of PM2.5 trends in australia and china","authors":"Xuying Ma ,&nbsp;Lidia Morawska ,&nbsp;Bin Zou ,&nbsp;Jay Gao ,&nbsp;Jun Deng ,&nbsp;Xiaoqi Wang ,&nbsp;Haojie Wu ,&nbsp;Xin Xu ,&nbsp;Yifan Wang ,&nbsp;Zelei Tan ,&nbsp;Ningbo Jiang ,&nbsp;Yunzhong Shen ,&nbsp;Danyang Li ,&nbsp;Jun Gao ,&nbsp;Yuanyuan Fan ,&nbsp;Jennifer Salmond","doi":"10.1016/j.envint.2025.109378","DOIUrl":"10.1016/j.envint.2025.109378","url":null,"abstract":"<div><div>In 2021, the World Health Organization (WHO) released new Air Quality Guidelines (AQG) which significantly reduced the recommended annual mean concentration of fine particulate matter (PM_2.5) in ambient air from 10 μg/m³ (AQG 2005) to 5 μg/m³ (AQG 2021). Recent studies have shown that this challenging new target may be close to or even below the background levels of PM_2.5 resulting from non-anthropogenic activities in many regions globally, such as areas affected by desert dust. This raises an important question: can countries achieve compliance with the new guideline for PM_2.5? Here we investigated this question from the perspective of two countries that fall on opposite ends of the spectrum of ambient air pollution. We examined historical PM_2.5 trends based on observations of annual mean PM_2.5 concentrations from 2013 to 2024 in eight capital cities of each state in Australia and 31 capital cities of each province in mainland China. A statistical model was used to differentiate the contributions of meteorological variations and anthropogenic drivers to determining the annual trends of PM_2.5 concentrations. Subsequently, we analyzed and discussed the feasibility of meeting the guidelines for each city based on these results. Our findings demonstrate that compliance with the new guideline is largely achievable, or has the potential to be achieved, in more than half of the cities in Australia. Notably, there is a high probability that a city, after meeting the guideline, may return to the non-compliance again. In addition, in some cities, eliminating anthropogenic emissions may not lead to a significant further reduction in PM_2.5 concentrations, and they might not achieve compliance. In contrast, PM_2.5 concentrations are an order of magnitude higher in some cities in China, yet Lhasa holds the potential to become the first Chinese city to meet the guideline in the future. Meeting the new AQG is highly challenging for Chinese cities, and even if achievable, it will take a long time. However, it is certain that China still has significant potential for further reductions in PM_2.5 concentrations. This can be achieved through the ongoing implementation of emission control measures and the transition to the use of new sources of energy to reduce anthropogenic emissions. This study provides insights into the development of city-specific policies for air pollution control and management in both Australia and China.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109378"},"PeriodicalIF":10.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-cascade physiologically based kinetic (PBK) matrix model: Simulating chemical bioaccumulation across food webs","authors":"Shaorong Chen,&nbsp;Zijian Li","doi":"10.1016/j.envint.2025.109376","DOIUrl":"10.1016/j.envint.2025.109376","url":null,"abstract":"<div><div>In modern ecosystems, many substances that biomagnify within food webs adversely affect organisms and ecological systems. To facilitate high-throughput screening of contemporary chemicals, we developed a multi-cascade physiologically-based kinetic (PBK) matrix model to simulate bioaccumulation and biomagnification along food chains. The model’s validity is supported by the mean model bias (MB) values, which fall within the acceptable range when compared with measured biomagnification factors (BMFs) reported in the literature. Analyzing 3,074 organic chemicals, we estimated their biotransfer factors (BTFs)—the steady-state ratio of chemical concentrations in primary consumer tissues to those in their feed—and their BMFs—the steady-state ratio of chemical concentrations in predators to their prey. Our results reveal consistent BTF trends across different tissues within the same species for a given chemical. Chemicals with moderate lipophilicity and low diffusivity tend to be retained longer in organisms, leading to higher BMFs. Notably, mammals appear particularly sensitive to persistent organic pollutants, while birds and ectothermic species do not exhibit clear patterns. Overall, the study highlights that animal physiological parameters and chemical physicochemical properties are more critical in determining bioaccumulation and potential toxicity than an organism’s trophic position. Future research should refine key physiological parameters, such as hepatic metabolic rate constants, account for life-stage variations, and evaluate multiple exposure pathways to further enhance model accuracy and real-world applicability.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109376"},"PeriodicalIF":10.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical risk assessment in food animals via physiologically based pharmacokinetic modeling – Part II: Environmental pollutants on animal and human health assessments","authors":"Kun Mi ,&nbsp;Zhoumeng Lin","doi":"10.1016/j.envint.2025.109372","DOIUrl":"10.1016/j.envint.2025.109372","url":null,"abstract":"<div><div>Human activities generate a large amount of environmental pollutants, including drugs and agricultural and industrial chemicals that are released into the air, water, and soil. Environmental pollutants can enter food animals through contaminated feed and water, posing risks to human health via the food chain. Physiologically based pharmacokinetic (PBPK) modeling is used to predict the target organ dosimetry informing human health risk assessment. However, there is a lack of critical reviews concerning PBPK models for environmental pollutants in food animals in the last several years (2020–2024). This review is part of a series of reviews focusing on applications of PBPK models for drugs and environmental chemicals in food animals to inform human health and food safety assessments. Part I is focused on veterinary drugs. The present article is Part II and focuses on environmental chemicals, including pesticides, polychlorinated biphenyls (PCBs), bisphenols, and per- and polyfluoroalkyl substances (PFAS). This article discusses the existing challenges in developing PBPK models for environmental pollutants and shares our perspectives on future directions, including the combinations of <em>in vitro</em> to <em>in vivo</em> extrapolation (IVIVE), machine learning and artificial intelligence, read-across approaches, and quantitative pharmacodynamic modeling to enhance the potential applications of PBPK models in assessing human health and food safety.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109372"},"PeriodicalIF":10.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recreational exposure to polluted open water and infection: A systematic review and meta-analysis protocol","authors":"Matt Lloyd Jones, Anne Clare Frances Leonard, Alison Bethel, Emma Lamb, William H. Gaze, Tim Taylor, Andrew C. Singer, Obioha C. Ukoumunne, Ruth Garside","doi":"10.1016/j.envint.2025.109371","DOIUrl":"https://doi.org/10.1016/j.envint.2025.109371","url":null,"abstract":"<h3>Background</h3>Open water recreation (e.g. swimming, surfing) is growing in popularity alongside concerns about contracting infections as a result of wastewater (including sewage) and runoff pollution in seas, rivers, lakes, and other bodies of open water. Previous systematic reviews have found evidence for a positive association between exposure to open water and infection. However, these syntheses focus on comparisons of recreational water users and non-recreational water users, and make concessions on key stages of the systematic review process. This limits their ability to summarise the evidence for an effect of exposure to pollution, specifically.<h3>Methods</h3>We present a peer-reviewed protocol for a systematic review and <em>meta</em>-analysis of exposure to wastewater and runoff pollution and infection in recreational open water users in the Global North. Eligible studies must contain at least two groups of recreational water users known or suspected to have been exposed to distinct levels of pollution, with some estimate of cases of infection in each group. These studies will be obtained via searches of bibliographic databases (MEDLINE, Web of Science Core Collection, Environment Complete, and Global Health), grey literature sources, and supplementary search methods. Risk of bias in these studies will be assessed using Cochrane’s ROBINS-E and RoB 2 tools. Studies’ results will be qualitatively and quantitatively synthesised, following and reporting to contemporary standards and guidelines (e.g. PRISMA, SWiM). The results of the review will be summarised with a GRADE certainty assessment of the evidence for different types of infections, presented in a Summary of Findings table.","PeriodicalId":308,"journal":{"name":"Environment International","volume":"16 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Diverse Acinetobacter species and Plasmid-Driven spread of carbapenem resistance in pharmaceutical settings in China","authors":"Jintao He ,&nbsp;Liang Hong ,&nbsp;Meijun Song ,&nbsp;Yisha Zhang ,&nbsp;Wang Zhang ,&nbsp;Linghong Zhang ,&nbsp;Danyan Zhou ,&nbsp;Zhouwei Chen ,&nbsp;Yunsong Yu ,&nbsp;Huan Chen ,&nbsp;Xiaoting Hua","doi":"10.1016/j.envint.2025.109373","DOIUrl":"10.1016/j.envint.2025.109373","url":null,"abstract":"<div><div><em>Acinetobacter</em> species have emerged as a significant public health concern due to their remarkable capacity to acquire antimicrobial resistance. Environmental reservoirs play a crucial role in spreading antimicrobial resistance genes and potentially pathogenic bacteria to clinical settings. However, most studies on nonhuman isolates have focused on a limited sample size. Comprehensive population sampling on One Health principles is essential to monitor the antibiotic resistome and virulome in <em>Acinetobacter</em> spp. Here, we identified three carbapenems-resistant <em>Acinetobacter</em> spp. isolates harboring <em>bla</em>_NDM-1 and discovered two novel <em>Acinetobacter</em> species in pharmaceutical production environments. A total of 94 <em>Acinetobacter</em> spp. strains were isolated from pharmaceutical production environments across 17 cities in China, forming 17 distinct <em>Acinetobacter</em> clusters comprising two novel species and 15 previously known species. Phylogenetic analysis indicated that <em>Acinetobacter</em> spp. isolated from pharmaceutical settings are predominantly confined to these settings. Genomic analysis revealed 10 specific families of <em>bla</em>_CHDL genes in 51 isolates and <em>bla</em>_NDM-1 in three isolates. The overall rates of phenotypic resistance to antimicrobials were low among <em>Acinetobacter</em> spp. isolates, with less than 10 % resistance observed for all tested drugs, and only three isolates carrying <em>bla</em>_NDM-1 were resistant to carbapenems. The <em>bla</em>_NDM-1 gene was located in approximately 49 kb PTU-Pse8 conjugative plasmids with conserved backbones, although plasmid pXH1688-NDM displayed enhanced growth and stability. Two novel <em>Acinetobacter</em> species, <em>A. yuyunsongii</em> sp. nov. and <em>A. chenhuanii</em> sp. nov., were characterized using phenotypic and genomic analyses. Particularly, <em>A. yuyunsongii</em> sp. nov. XH1639 harbors a <em>bla</em>_OXA-58-carrying conjugative plasmid and exhibits multidrug-resistant phenotype. Our study advances <em>Acinetobacter</em> taxonomy and underscores the urgency of monitoring the dynamics of <em>Acinetobacter</em> species in environmental sources to implement effective measures to mitigate transmission risks to healthcare facilities.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109373"},"PeriodicalIF":10.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distance to the water table shapes the diversity and activity of DNA and RNA viruses in a subalpine peatland","authors":"Ziye Xiong ,&nbsp;Xuan Qiu ,&nbsp;Xing Xiang ,&nbsp;Lanlan Cai ,&nbsp;Nian Wang ,&nbsp;Xianyu Huang ,&nbsp;Hongmei Wang","doi":"10.1016/j.envint.2025.109363","DOIUrl":"10.1016/j.envint.2025.109363","url":null,"abstract":"<div><div>Peatlands are essential reservoirs of carbon and critical zones for the cycling of greenhouse gases on Earth. Their ecological functions are primarily governed by the microbial communities inhabiting them, which vary with hydrological conditions. However, the roles of viruses in peatland ecosystems remain poorly understood despite their abundance and ubiquity. To address this gap, viral communities, their ecological roles, and their responses to environmental factors were explored using viromics, metatranscriptomics, and physicochemical property analyses of nine peat sediments collected from various layers of three profiles with different water table levels in the Dajiuhu Peatland, central China. This study revealed that the distance to the water table (DWT) significantly influenced the composition and function of viral communities by altering the levels of redox potential and total organic carbon, which in turn affected methane (CH₄) concentrations in pore water. Furthermore, a notable abundance of putative auxiliary metabolic genes associated with methane, nitrogen, and sulfur metabolism was identified in peatland DNA viruses, with their community composition strongly regulated by DWT. Additionally, functional genes related to oxidative phosphorylation and cysteine synthesis were detected for the first time in peatland RNA viruses. This study advances our comprehension of how hydrological conditions affect viral communities in peatlands, provides new insights into the impact of viruses on the CH₄ cycle, and serves as a crucial reference for future investigations into the ecological roles of viruses.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"197 ","pages":"Article 109363"},"PeriodicalIF":10.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}