Environmental Toxicology and Chemistry最新文献_第4页

Reevaluating copper algaecide dosing to manage water quality: a multiple linear regression approach. 重新评估铜杀藻剂剂量以管理水质：多元线性回归方法。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-10-01 DOI: 10.1093/etojnl/vgaf175

Michael B McDonald, Ashley V Hennessey, Peyton P Johnson, Matthew F Gladfelter, Kate L Merrill, Suzanne E Tenison, Sathya S Ganegoda, Tham C Hoang, H Allen Torbert, Benjamin H Beck, Alan E Wilson

{"title":"Reevaluating copper algaecide dosing to manage water quality: a multiple linear regression approach.","authors":"Michael B McDonald, Ashley V Hennessey, Peyton P Johnson, Matthew F Gladfelter, Kate L Merrill, Suzanne E Tenison, Sathya S Ganegoda, Tham C Hoang, H Allen Torbert, Benjamin H Beck, Alan E Wilson","doi":"10.1093/etojnl/vgaf175","DOIUrl":"10.1093/etojnl/vgaf175","url":null,"abstract":"Copper sulfate pentahydrate has been extensively used to control the growth of nuisance phytoplankton, including toxigenic cyanobacteria, in freshwater systems for more than 100 years. While the use of copper is well-studied, the dosing methodologies employed are less understood and lack a rigorous scientific basis. The present study aimed to develop a predictive multiple linear regression (MLR) model based on basic water quality parameters that can be used to determine an optimal algicidal dose that minimizes non-target effects on the overall aquatic ecosystem. This model was developed from a series of comprehensive controlled laboratory bioassays relating key water quality parameters, such as pH, hardness, alkalinity, and dissolved organic carbon (DOC), to algal copper toxicity. These bioassays demonstrated that DOC and pH were the most important predictors of copper toxicity to phytoplankton (r2 = 0.813, p < 0.0001). Subsequently, a rigorous field-based test of the novel MLR-derived dose was conducted using a replicated, 28-day experiment in an active aquaculture pond. The MLR-based dose, which contained 60% less copper than the standard dose, resulted in equivalent control of harmful algae (95% reduction) to the higher standard dose. Furthermore, the MLR dose caused less harm to the overall beneficial phytoplankton and zooplankton communities than the alkalinity-based dose. These results show that MLR can be used for the development of more ecologically sound methods of controlling harmful algal blooms.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":"2957-2966"},"PeriodicalIF":2.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144559538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Targeted quantitation of 6PPD-quinone in fish tissue samples with liquid chromatography-tandem mass spectrometry. 液相色谱-串联质谱法定量测定鱼类组织样品中6ppd-醌。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-10-01 DOI: 10.1093/etojnl/vgaf151

Adam H Moody, David J Soucek, David A Alvarez

{"title":"Targeted quantitation of 6PPD-quinone in fish tissue samples with liquid chromatography-tandem mass spectrometry.","authors":"Adam H Moody, David J Soucek, David A Alvarez","doi":"10.1093/etojnl/vgaf151","DOIUrl":"10.1093/etojnl/vgaf151","url":null,"abstract":"The tire additive transformation product N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-quinone) has recently garnered global attention due to its acute toxicity to some salmonids, such as coho salmon (Oncorhynchus kisutch), and its ubiquitous presence in urban stormwater systems. In this study, we developed and compared the extraction efficiency of two sample preparation methodologies for quantification of 6PPD-quinone among two fish tissue sample types that included fillet of smallmouth bass (Micropterus dolomieu) and whole-body samples of O. kisutch fry subjected to in vivo exposure tests with 6PPD-quinone. The two sample preparation methods tested included an accelerated solvent extraction (ASE) approach and a sonication extraction approach. Both sample preparation methods included identical purification steps for the crude sample extracts with enhanced matrix removal cartridges. The purified sample extracts were subjected to targeted analysis of 6PPD-quinone using ultra-performance liquid chromatography-tandem mass spectrometry. The results showed that extractions made with the reported ASE method demonstrated significantly higher absolute recovery (80%-96%) of the extracted internal standard, [13C6]-6PPD-quinone, than sonication-based extractions (74%-80%) in both fish tissue sample types. The proposed ASE method shows acceptable limits of quantification (0.37-0.67 ng g-1), linearity (R2 > 0.996), and repeatability (relative standard deviation ≤ 9%). This work advances research capabilities for investigations on the toxicokinetic processes of 6PPD-quinone in biological samples.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":"2807-2817"},"PeriodicalIF":2.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144274483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Applying Eco-indicator Sensitivity Distribution (EcoSD) to Evaluate Chlorpyrifos Risk in Grassland Soils with Prescribed Fire and Grazing History. 应用生态指标敏感性分布（EcoSD）评价草原区土壤毒死蜱风险

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-30 DOI: 10.1093/etojnl/vgaf244

Hamzat O Fajana, Adedamola A Adedokun, Philip A Abiolu, Olukayode O Jegede, Eric G Lamb, Steven D Siciliano

{"title":"Applying Eco-indicator Sensitivity Distribution (EcoSD) to Evaluate Chlorpyrifos Risk in Grassland Soils with Prescribed Fire and Grazing History.","authors":"Hamzat O Fajana, Adedamola A Adedokun, Philip A Abiolu, Olukayode O Jegede, Eric G Lamb, Steven D Siciliano","doi":"10.1093/etojnl/vgaf244","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf244","url":null,"abstract":"Prescribed fire and grazing can enhance soil ecosystem functions in grasslands but may also induce ecological stress on soil function, making soil more vulnerable to chemical stressors like pesticides, which contaminate grasslands via aerial spray drift. Therefore, this study investigated the effects of prescribed fire-grazing history and chlorpyrifos toxicity on selected soil quality parameters and ecological indicators \"eco-indicators\" in a fescue prairie grassland soil. Burnt soil from area subjected to prescribed fire in 2017 and annual cattle grazing and unburnt reference soil from adjacent areas subjected to grazing alone were collected in 2021 and exposed to varying doses of chlorpyrifos. Results showed no interactive effect of fire-grazing and chlorpyrifos toxicity on the measured soil quality parameters and eco-indicators. While the fire-grazing effect in the burnt soil significantly enhanced soil quality parameters like base cations and available nitrogen, it exacerbated chlorpyrifos toxicity on key soil eco-indicators like Oribatid mites and soil extracellular enzyme, acid phosphatase. Based on the Eco-indicator Sensitivity Distribution (EcoSD) framework, the burnt soil with history of fire and grazing, was generally susceptible to chlorpyrifos with ecological hazard concentrations at 5% (HC5Eco) to 50% (HC50Eco) ranging from 0.08-1.5 mg/kg compared to 0.5-4.0 mg/kg in the unburnt soil with grazing history alone. Regardless of the fire treatment, arylamidase, an enzyme crucial for nitrogen mineralization, was the most sensitive soil eco-indicator to chlorpyrifos toxicity. These findings suggest that fire, in combination with grazing, may increase the susceptibility of soil eco-indicators to chlorpyrifos toxicity, potentially due to changes in organic matter quality or increased stress from pyric byproducts.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145191453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

The toxicity of insecticide broflanilide on human SH-SY5Y cells. 溴flanilide杀虫剂对人SH-SY5Y细胞的毒性。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-26 DOI: 10.1093/etojnl/vgaf243

Yifan Xu, Xunyou Wang, Xifa Yang, Xiangyang Liu, Meizi Wang, Shiheng An, Risong Na, Youwu Hao

{"title":"The toxicity of insecticide broflanilide on human SH-SY5Y cells.","authors":"Yifan Xu, Xunyou Wang, Xifa Yang, Xiangyang Liu, Meizi Wang, Shiheng An, Risong Na, Youwu Hao","doi":"10.1093/etojnl/vgaf243","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf243","url":null,"abstract":"Broflanilide (BFL) is a new bis-amide insecticide that binds to γ-aminobutyric acid receptor, has attracted widespread attention because of its high efficiency, broad spectrum and novel mechanism of action. It is widely used, which may pose short or long-term safety risks to humans or environment. This study focuses on the toxic effects of commercial BFL formulation on human neuroblastoma cell line (SH-SY5Y) in vitro. The 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide method, flow cytometric analysis, fluorescent staining method, immunofluorescence, single cell gel electrophoresis and protein immunoblotting were carried out for this study. The results showed that the commercial BFL formulation could cause mitochondrial damage (the collapse of mitochondrial membrane potential and the opening of mitochondrial permeability transition pore), DNA damage (DNA single-strand breaks, DNA double-strand breaks and oxidative DNA damage), alters the expression of related proteins and induces mitochondria-mediated apoptosis. And the cytotoxicity of the BFL formulation is mainly caused by the active ingredient BFL. In conclusion, this study provides a theoretical basis for the damage of BFL to human cells. To our knowledge, this is the first report of the toxic effects of BFL or its formulation on human cells, which suggesting the possible security risk of BFL on human beings and attract more people's attention to its environmental toxicity effects.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145148428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Exploring the reproductive toxicity and mechanism analysis of perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) based on network toxicology, molecular docking, and experimental validation. 基于网络毒理学、分子对接和实验验证，探索全氟辛酸（PFOA）和全氟壬酸（PFNA）的生殖毒性及机制分析。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-25 DOI: 10.1093/etojnl/vgaf242

Chao Wang, Xuewen Diao, Hao Zhang, Shiqi Wang, Yinuo Zhang, Sai Hin Lai, Wan Zurina Binti Wan Jaafar

{"title":"Exploring the reproductive toxicity and mechanism analysis of perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) based on network toxicology, molecular docking, and experimental validation.","authors":"Chao Wang, Xuewen Diao, Hao Zhang, Shiqi Wang, Yinuo Zhang, Sai Hin Lai, Wan Zurina Binti Wan Jaafar","doi":"10.1093/etojnl/vgaf242","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf242","url":null,"abstract":"This study combined network toxicology, molecular docking, and animal experiments to systematically investigate the reproductive toxicity and potential mechanisms of perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA). A total of 173 and 151 male infertility-related targets were identified for PFOA and PFNA, respectively, with key targets including AKT1, ESR1, EGFR, and HSP90AA1. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis revealed significant involvement of pathways such as phosphoinositide 3-kinase (PI3K)-protein kinase B (AKT), mitogen-activated protein kinase (MAPK), and Forkhead box O (FoxO). Molecular docking predicted favorable binding affinities (all binding energies < -7 kcal/mol) between both compounds and the core targets, suggesting potential biological relevance. Due to their structural similarity and overlapping target profiles, PFOA was selected as the representative compound for experimental exposure. In vivo studies showed that PFOA exposure led to significant downregulation of PI3K, AKT, and mammalian target of rapamycin (mTOR) expression in mouse testes at both mRNA and phosphorylation levels. Additionally, PFOA exposure caused disruptions in serum testosterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) levels, increased oxidative stress markers (elevated malondialdehyde (MDA), reduced superoxide dismutase (SOD) and glutathione (GSH)), and induced sperm DNA fragmentation and morphological abnormalities. Histological analysis revealed testicular structural damage, germ cell disorganization, and increased apoptosis. These findings demonstrate that PFOA and PFNA likely exert reproductive toxicity through interference with the PI3K-AKT-mTOR signaling pathway, leading to oxidative stress, endocrine disruption, and reduced spermatogenesis.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145136964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Bioaccumulation of metals in a critically endangered migratory songbird, the Yellow-breasted Bunting (Emberiza aureola). 一种极度濒危的迁徙鸣禽黄胸鹀（Emberiza aureola）体内金属的生物积累。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-25 DOI: 10.1093/etojnl/vgaf241

Wangworn Sankamethawee, Sarun Keithmaleesatti, Pattraporn Simla, Wieland Heim

{"title":"Bioaccumulation of metals in a critically endangered migratory songbird, the Yellow-breasted Bunting (Emberiza aureola).","authors":"Wangworn Sankamethawee, Sarun Keithmaleesatti, Pattraporn Simla, Wieland Heim","doi":"10.1093/etojnl/vgaf241","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf241","url":null,"abstract":"The bioaccumulation of metals can cause negative effects on health status and body condition in wildlife. However, research in this field is strongly biased towards Europe and North America. Here we investigate metal and metalloid concentrations in feathers of a once common but now critically endangered migratory songbird, the Yellow-breasted Bunting Emberiza aureola. Feathers were sampled in Thailand but most likely moulted in China, where the species stops over during migration, and therefore likely relate to background pollution levels at these stopover sites. We detected chromium, copper, manganese, iron, lead, tin and zinc in 100% of the samples, whereas arsenic was detected in 9% and mercury as well as cadmium in 2% of the individuals. Most importantly, we found a weak but significant negative association of zinc concentration and individual body condition. Lower body condition could limit successful migration and ultimately lead to higher fitness costs and reduced survival in this threatened species. We call for studies to investigate whether elevated zinc exposure in Yellow-breasted Buntings is linked to mining activities or to the recent increase in zinc-biofortified rice planted in Asia to combat human zinc deficiency.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145136955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

PikMe: A flexible prioritization tool for chemicals of emerging concern. PikMe：一个灵活的化学品优先排序工具。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-25 DOI: 10.1093/etojnl/vgaf237

Aina Charlotte Wennberg, Pawel Rostkowski, Malcolm Reid

{"title":"PikMe: A flexible prioritization tool for chemicals of emerging concern.","authors":"Aina Charlotte Wennberg, Pawel Rostkowski, Malcolm Reid","doi":"10.1093/etojnl/vgaf237","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf237","url":null,"abstract":"Identifying new contaminants of emerging concern remains a complex task due to the sheer number of chemical substances potentially released into the environment, the scattered sources of information and often the lack of adequate data. Environmental screening and monitoring programs are designed to map the presence, sources, and potential environmental impacts of contaminants, yet prioritising which chemicals to include in such efforts remains resource-intensive and technically challenging. PikMe is a modular, open-access prioritization tool that integrates information from major data bases and evaluates the concern and reliability of the data for more than one million substances. PikMe is built in a modular way so that prioritization can be done based on specific chemical properties relevant to a given scenario (ie, drinking water contaminants or bioaccumulation in biota) rather than assigning only a global risk score. PikMe scores substances based on persistence, bioaccumulation, mobility, environmental toxicity, and human toxicity, assigning individual score per property. Additionally, PikMe is designed for flexibility by allowing the integration of external lists of chemicals and supporting optional add-ons. Different scenarios of use are described in this paper, including the selection of chemicals for environmental monitoring and screening in Norway and the assessment of the implications of the new classifications according to Regulation for Classification, Labelling and Packaging of substances and mixtures (CLP) on persistent chemicals.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145136998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Shedding microplastics: Metamorphosis as a potential detoxification mechanism for microplastics in chironomus riparius. 脱落的微塑料：蜕变作为微塑料的潜在解毒机制。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-23 DOI: 10.1093/etojnl/vgaf240

Dimitrija Savić-Zdravković, Jelena Stojanović, Melita Mustafić, Dragana Ašćerić, Milica Nikolić, Đurađ Milošević

{"title":"Shedding microplastics: Metamorphosis as a potential detoxification mechanism for microplastics in chironomus riparius.","authors":"Dimitrija Savić-Zdravković, Jelena Stojanović, Melita Mustafić, Dragana Ašćerić, Milica Nikolić, Đurađ Milošević","doi":"10.1093/etojnl/vgaf240","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf240","url":null,"abstract":"The modern era is characterized by the vast production of plastics, with aquatic ecosystems acting as major sinks for contaminants, making aquatic species highly susceptible to microplastic (MP) ingestion. Accumulation of MPs in benthic zones enables direct interaction between these particles and benthic organisms. This study utilized the Organisation for Economic Co-operation and Development chronic exposure test on Chironomus riparius larvae to assess the effects of MP concentrations ten times higher than environmentally relevant ones on life-history traits and to monitor particle presence throughout the life cycle. After digestion, MPs were counted in both adult C. riparius and exuviae. Results indicated a significant delay in developmental time, a reduction in developmental rate, and a lag in cumulative emergence in the MP-treated group even though the total emergence was not affected. Notably, exuviae retained significantly more MPs than adults, indicating metamorphosis as a potential detoxification route. These findings advance our understanding of life-stage-specific MP dynamics in freshwater invertebrates and suggest a novel mechanism for contaminant elimination via exuvial shedding.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145124467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Toxicity of copper to two endemic antarctic bdelloid rotifers adineta sp. and habrotrocha sp. (Bd14). 铜对两种南极特有的蛭形轮虫adineta sp.和habrotrocha sp.的毒性研究（Bd14）。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-23 DOI: 10.1093/etojnl/vgaf239

Melanie D Borup, Simon J Wotherspoon, Kathryn E Brown, Scott C Stark, Catherine K King

{"title":"Toxicity of copper to two endemic antarctic bdelloid rotifers adineta sp. and habrotrocha sp. (Bd14).","authors":"Melanie D Borup, Simon J Wotherspoon, Kathryn E Brown, Scott C Stark, Catherine K King","doi":"10.1093/etojnl/vgaf239","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf239","url":null,"abstract":"Past waste management practices and ongoing human activities at Antarctic research stations have resulted in contamination of terrestrial environments. Antarctic bdelloid rotifers are often endemic and biodiverse, inhabiting the ice-free areas that humans commonly occupy. While waste and environmental management practices have improved, the impacts on native biota of exposure to contaminants, including metals, from legacy sources is largely unknown. To determine their sensitivity to copper, chronic toxicity tests of 28 days duration were performed on two endemic bdelloid rotifer species, Adineta sp. and Habrotrocha sp. (Bd14). Rotifer activity was dramatically reduced over the first 1-3 days of exposure, after which normal activity was observed through the continuation of their life cycle. Mortality increased with increasing exposure duration for the first 18 days of the test. Estimated Lethal Concentrations causing 50% mortality (LC50) were 227 and 170 µg L-1 Cu at 4 d and 104 and 68 µg L-1 Cu at 18 d for Adineta sp. and Habrotrocha sp. (Bd14), respectively. Reproduction in both species was impacted by exposure to copper with 50% reduction in reproductive output (EC50) at 53 and 38 µg L-1 Cu at 28 d, respectively. Results from this project will be used to inform risk assessments at contaminated sites in Antarctica and can be used in the development of Antarctic-specific environmental quality guidelines.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145124486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Mercury contamination: A hidden threat to long distance migrant shorebirds in critical wintering sites on the West Coast of India. 汞污染：对印度西海岸重要越冬地点的长途候鸟的潜在威胁。

IF 2.8 4区环境科学与生态学

Environmental Toxicology and Chemistry Pub Date : 2025-09-23 DOI: 10.1093/etojnl/vgaf238

K A Rubeena, K M Aarif

{"title":"Mercury contamination: A hidden threat to long distance migrant shorebirds in critical wintering sites on the West Coast of India.","authors":"K A Rubeena, K M Aarif","doi":"10.1093/etojnl/vgaf238","DOIUrl":"https://doi.org/10.1093/etojnl/vgaf238","url":null,"abstract":"Important one of the many hypotheses attributed to the global decline in shorebirds is the exposure to contaminants, particularly concerning wintering shorebirds. However, there is limited information available on contaminant levels in winter migrant shorebirds, especially within the Central Asian Flyway. This research gap is addressed in this study on mercury contamination in 10 species of long-distance migrant shorebirds along the west coast of India from 2019 to 2021. Of all the 10 species of shorebirds studied, the highest concentration of mercury was reported in the droppings of Common Redshank in the mangroves (81.29 ± 6.82 mg/kg wet wt.) and the lowest was reported in Little Stint in sand beach (17.40 ± 2.14 mg/kg wet wt.). Kadalundi-Vallikunnu Community Reserve (KVCR) and its adjacent sand beaches serve as vital stop-over sites within the Central Asian Flyway, catering to the nutritional needs of various migratory shorebirds, including transoceanic, over-summering and locally moving species. This research offers solid evidence of mercury concentration in the predators occupying high trophic levels of the coastal ecosystems in the KVCR and surrounding areas. Understanding the extent and impact of mercury concentration on both organisms and their habitat is crucial. The study highlights a significant increase of Hg concentration across the years. Additionally, it provides essential information to support extensive, long term biomonitoring efforts aimed at conserving shorebirds regionally and globally.","PeriodicalId":11793,"journal":{"name":"Environmental Toxicology and Chemistry","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145124548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0