Article
Water Resources
Sara R. Warix, Sarah E. Godsey, Kathleen A. Lohse, Rebecca L. Hale
Summary: Non-perennial streams, comprising over half of the global stream network, have significant impacts on downstream water quality. Aridity is a major driver of stream drying globally, but the complexity of drying patterns in headwater streams may be influenced by topographic and subsurface factors. Groundwater residence times and contributions to streamflow were found to have a poor relationship, suggesting that old, deep groundwater pathways are not enough to sustain surface flows. Topography only explained about 30% of the variability in seasonal flow permanence, and there was no correlation between seasonal drying and down-valley subsurface storage area. Future studies should focus on pairing spatial observations of subsurface properties with seasonal flow permanence observations.
HYDROLOGICAL PROCESSES
(2021)
Article
Water Resources
Dale R. Van Stempvoort, D. Ross MacKay, Pamela Collins, Geoff Koehler
Summary: Nutrient concentrations in riparian groundwater vary, making it difficult to quantify nutrient fluxes from groundwater discharge to headwater streams. This study uses a different method to estimate groundwater discharge and nutrient loading by analyzing stream discharge data and samples collected during a specific period. The findings suggest that groundwater discharge plays an important role in nutrient loading to headwater streams and supports previous studies on the influence of legacy reservoirs on nutrient loads in similar agricultural catchments.
HYDROLOGICAL PROCESSES
(2022)
Article
Environmental Sciences
Dongwei Lv, Qian Yu, Danni Xie, Jiawei Zhang, Xiaodong Ge, Gaoyue Si, Bin Zhao, Shuxiao Wang, Thorjorn Larssen, Lei Duan
Summary: The study found that streams in China have higher critical loads and lower risk of acidification compared to Europe and North America. The decrease in acid deposition exceeding critical load from 40.4% in 2005 to 29.5% in 2018 indicates a significant reduction in surface water acidification risk, with continued efforts needed in emission reduction policies, especially in southeast China.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
Benjamin J. Dittbrenner, Jason W. Schilling, Christian E. Torgersen, Joshua J. Lawler
Summary: Many areas are experiencing increased stream temperatures and reduced water availability due to climate change. Beaver relocation and dam building can help increase water storage, cool stream temperatures, and improve ecosystem resilience. Experimental studies have shown that dams built by relocated beavers can effectively increase water storage and decrease stream temperatures in the first year. However, further research is needed to understand the regional factors that influence the impact of beavers on water storage and temperature.
Article
Environmental Sciences
Josef Krecek, Jana Novakova, Ladislav Palan, Eva Pazourkova, Evzen Stuchlik
Summary: This study analyzed the changing protective functions of forests in the upper plain of the Jizera Mts. since the second half of the 19th century, showing a shift in forest types from native stands to plantations and a change in the priority of protective forest functions.
INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
(2021)
Article
Plant Sciences
Chenjun Zeng, Ran Xing, Bensheng Huang, Xiangju Cheng, Wenqing Shi, Shufeng Liu
Summary: Phytoplankton communities in headwater streams show lower levels of spatiotemporal variability compared to plain rivers due to lower nutrient levels and strong hydrodynamics, which also contribute to greater diversity and succession towards Cyanophyta.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yizhu Zhu, J. Iwan Jones, Adrian L. Collins, Yusheng Zhang, Louise Olde, Lorenzo Rovelli, John F. Murphy, Catherine M. Heppell, Mark Trimmer
Summary: Headwater streams in UK are experiencing increased fine sediment delivery, resulting in amplified streambed organic matter and methane production, and ultimately tripling methane emissions. Catchment management targeting the reduction of excess fine sediment could lead to a 70% decrease in stream methane emissions.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Ylva Sjoberg, Ahmad Jan, Scott L. Painter, Ethan T. Coon, Michael P. Carey, Jonathan A. O'Donnell, Joshua C. Koch
Summary: The presence of permafrost in Arctic landscapes affects the flow paths of water, potentially impacting stream discharge and thermal regimes. Simulations show that hillslopes with continuous permafrost have shallower flow paths and higher rates of evapotranspiration. Thawing permafrost alters groundwater flow paths, leading to decreases in summer stream temperatures and reductions in evapotranspiration.
WATER RESOURCES RESEARCH
(2021)
Article
Limnology
Susana Bernal, Mathew J. Cohen, Jose L. J. Ledesma, Lily Kirk, Eugenia Marti, Anna Lupon
Summary: This study reveals that in some headwater streams, in-stream metabolism may play a more important role in driving carbon cycling than previously assumed. The production of CO2 within the streams significantly contributes to the total atmospheric CO2 flux.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
Jianwei Geng, Hengpeng Li, Dongqiang Chen, Xiaofei Nei, Yaqin Diao, Wangshou Zhang, Jiaping Pang
Summary: The study revealed a significant decrease in atmospheric nitrogen deposition at the headwater site, primarily due to a sharp decline in ammoniacal nitrogen deposition and relatively stable nitrate nitrogen deposition. This decline is beneficial in reducing nitrate nitrogen leaching in natural forest ecosystems. The long-term monitoring of atmospheric nitrogen deposition is crucial for developing emission control measures and safeguarding ecosystem health at a regional level.
ATMOSPHERIC RESEARCH
(2021)
Article
Engineering, Civil
Jana Erdbrugger, Ilja van Meerveld, Jan Seibert, Kevin Bishop
Summary: In humid climates, the relationship between shallow groundwater and surface topography can change over time, particularly when catchment wetness varies. The direction of groundwater gradients can vary by up to 360 degrees over short distances and up to 270 degrees over larger distances. Smoothed digital elevation models represent the groundwater surface better than high-resolution models.
JOURNAL OF HYDROLOGY
(2023)
Article
Limnology
Mayra P. D. Rulli, Ann-Kristin Bergstrom, Ryan A. Sponseller, Martin Berggren
Summary: This study investigates the impact of increased loading of dissolved organic matter on nutrient bioavailability in boreal freshwaters. The study found that the relative bioavailability of carbon, nitrogen, and phosphorus associated with terrestrial DOM is low in these waters. The study also highlights the seasonal variation in bioavailable organic nutrient pools and their links with temperature and hydrology.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Zlatko Petrin, Thomas Correll Jensen, Elina Lungrin, Knut Andreas Eikland
Summary: Roads form a global network of ecological barriers that have wide-ranging impacts on lotic ecosystems, including fragmentation, hydrological changes, sedimentation, and pollution. This study found that downstream of roads, there were lower densities of total macroinvertebrates and mayflies compared to upstream, while control streams did not show similar effects. Species density tended to be lower downstream, likely due to the lower macroinvertebrate densities at these sites. The species composition and abundances also differed between road impacted streams and control streams, suggesting a selection for different species in road impacted streams. Functional impacts included increased prevalence of predators in control streams and a higher proportion of grazers and shredders in road impacted streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
N. Siziba, T. Mwedzi, N. Muisa
Summary: This study assessed the water and sediment quality of headwater streams radiating from the Bulawayo area, revealing that the city sites were the most degraded due to the impact of urban-wastewater. The major pollutants included dissolved oxygen deficiency, embeddedness by particulates, turbidity, conductivity, total dissolved solids, etc., highlighting the urgent need for interventions to improve the quality of urban-wastewater.
PHYSICS AND CHEMISTRY OF THE EARTH
(2021)
Article
Environmental Sciences
A. Marshall, X. Zhang, A. H. Sawyer, E. Wohl, K. Singha
Summary: The logjams in a stream create transient storage zones within the surface and subsurface of the stream, which is influenced by logjam distribution density, permeability, and discharge. Experimental flume studies and numerical simulations show that multiple logjams enhance hyporheic exchange and surface water storage. Understanding logjam characteristics is important for managing rivers in forested environments.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
W. D. Robertson, D. R. Van Stempvoort, J. W. Roy, S. J. Brown, J. Spoelstra, S. L. Schiff, D. R. Rudolph, S. Danielescu, G. Graham
Article
Water Resources
John Spoelstra, James W. Roy, Susan J. Brown
GROUND WATER MONITORING AND REMEDIATION
(2016)
Article
Engineering, Environmental
Hyoun-Tae Hwang, S. K. Frey, Young-Jin Park, K. D. M. Pintar, D. R. Lapen, J. L. Thomas, J. Spoelstra, S. L. Schiff, S. J. Brown, E. A. Sudicky
Article
Environmental Sciences
D. R. Van Stempvoort, J. Struger, S. J. Brown
JOURNAL OF GREAT LAKES RESEARCH
(2019)
Article
Environmental Sciences
Dale R. Van Stempvoort, Susan J. Brown, Shirley Anne Smyth
Article
Engineering, Environmental
L. Mark Hewitt, James W. Roy, Steve J. Rowland, Greg Bickerton, Amila DeSilva, John Headley, Craig B. Milestone, Alan G. Scarlett, Susan Brown, Christine Spencer, Charles E. West, Kerry M. Peru, Lee Grapentine, Jason M. E. Ahad, Hooshang Pakdel, Richard A. Frank
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Environmental Sciences
D. R. Van Stempvoort, J. Spoelstra, S. J. Brown, W. D. Robertson, R. Post, S. A. Smyth
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Engineering, Environmental
Dale R. Van Stempvoort, Susan J. Brown, John Spoelstra, Dorothy Garda, William D. Robertson, Shirley Anne Smyth
Article
Environmental Sciences
Victoria R. Propp, Amila O. De Silva, Christine Spencer, Susan J. Brown, Sara D. Catingan, James E. Smith, James W. Roy
Summary: The study found various CECs in leachate of historic landfills, with some landfills having PFAS concentrations similar to modern landfills and elevated levels of certain substances increasing with landfill age, indicating historic landfills may be long-term sources of CECs to groundwater.
ENVIRONMENTAL POLLUTION
(2021)
Article
Water Resources
Dale R. Van Stempvoort, D. Ross MacKay, Geoff Koehler, Pamela Collins, Susan J. Brown
Summary: This study establishes a well-defined and comprehensive conceptual model of the subsurface hydrology in TDADC, with seven key concepts being tested in a rural area in southern Ontario, Canada using data collection involving chemical and isotopes tracers in various water samples. The model covers the role of groundwater in baseflow, the dominance of 'pre-event' water in stormflow, and the importance of both macropores and matrix, among other factors.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
Dale R. Van Stempvoort, William D. Robertson, Ross MacKay, Pamela Collins, Susan J. Brown, Serban Danielescu, Timothy Pascoe
Summary: This study addresses the role of groundwater in the nutrient balance for a restricted bay of a Precambrian Shield lake. The findings indicate seepage of septic plumes to the bay, but significant attenuation of septic-derived nutrients in the subsurface.
JOURNAL OF GREAT LAKES RESEARCH
(2021)
Article
Environmental Sciences
Toshimi Nakajima, Mao Kuragano, Makoto Yamada, Ryo Sugimoto
Summary: This study compared the contribution of submarine groundwater discharge (SGD) to river nutrient budgets at nearshore and embayment scales, and found that SGD-derived nutrients become more important at larger spatial scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Fan Liu, Lei Zhang, Chongyang Zhang, Ziguang Chen, Jingguang Li
Summary: NO2 emissions from wall-mounted gas stoves used for household heating have become a significant source of indoor pollution in Chinese urban areas. The high indoor concentration of NO2 poses potential health risks to residents. It is urgently necessary to establish relevant regulations and implement emission reduction technologies to reduce NO2 emissions from wall-mounted gas stoves.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Letter
Environmental Sciences
Hans Peter H. Arp, Raoul Wolf, Sarah E. Hale, Sivani Baskaran, Juliane Gluege, Martin Scheringer, Xenia Trier, Ian T. Cousins, Harrie Timmer, Roberta Hofman-Caris, Anna Lennquist, Andre D. Bannink, Gerard J. Stroomberg, Rosa M. A. Sjerps, Rosa Montes, Rosario Rodil, Jose Benito Quintana, Daniel Zahn, Herve Gallard, Tobias Mohr, Ivo Schliebner, Michael Neumann
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Surya Gupta, Pasquale Borrelli, Panos Panagos, Christine Alewell
Summary: The objective of this study is to incorporate soil hydraulic properties into the erodibility factor (K) of USLE-type models. By modifying and improving the existing equations for soil texture and permeability, the study successfully included information on saturated hydraulic conductivity (Ksat) into the calculation of K factor. Using the Random Forest machine learning algorithm, two independent K factor maps with different spatial resolutions were generated. The results show that the decrease in K factor values has a positive impact on the modeling of soil erosion rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jesmin Akter, Wendy J. M. Smith, Yawen Liu, Ilho Kim, Stuart L. Simpson, Phong Thai, Asja Korajkic, Warish Ahmed
Summary: The choice of workflow in wastewater surveillance has a significant impact on SARS-CoV-2 concentrations, while having minimal effects on HF183 and no effect on HAdV 40/41 concentrations. Certain components in the workflow can be interchangeable, but factors such as buffer type, chloroform, and homogenization speed can affect the recovery of viruses and bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yu Luo, Xueting Yang, Diwei Wang, Hongmei Xu, Hongai Zhang, Shasha Huang, Qiyuan Wang, Ningning Zhang, Junji Cao, Zhenxing Shen
Summary: Atmospheric PM2.5, which can generate reactive oxygen species (ROS), is associated with cardiorespiratory morbidity and mortality. The study found that both the mass concentration of PM2.5 and the DTT activity were higher during the heating season than during the nonheating season. Combustion sources were the primary contributors to DTT activity during the heating season, while secondary formation dominated during the nonheating season. The study also revealed that biomass burning had the highest inherent oxidation potential among all sources investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Erin L. Murphy, Leah R. Gerber, Chelsea M. Rochman, Beth Polidoro
Summary: Plastic pollution has devastating consequences for marine organisms. This study uses a trait-based framework to develop a vulnerability index for marine mammals, seabirds, and sea turtles in Hawai'i. The index ranks 63 study species based on their vulnerability to macroplastic pollution, providing valuable information for species monitoring and management priorities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Kenji Maurice, Amelia Bourceret, Sami Youssef, Stephane Boivin, Liam Laurent-Webb, Coraline Damasio, Hassan Boukcim, Marc-Andre Selosse, Marc Ducousso
Summary: Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Little is known about microbial community resistance and adaptation to disturbances, hindering our understanding of recovery latency and implications for ecosystem functioning. This study found that anthropic disturbance and natural disturbance have different effects on the topology and stability of soil microbial networks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yunhao Li, Yali Feng, Haoran Li, Yisong Yao, Chenglong Xu, Jinrong Ju, Ruiyu Ma, Haoyu Wang, Shiwei Jiang
Summary: Deep-sea mining poses a serious threat to marine ecosystems and human health by disturbing sediment and transmitting metal ions through the food chain. This study developed a new regenerative adsorption material, OMN@SA, which effectively removes metal ions. The adsorption mechanism and performance of the material for metal ion fixation were investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Antonio Medici, Margherita Lavorgna, Marina Isidori, Chiara Russo, Elena Orlo, Giovanni Luongo, Giovanni Di Fabio, Armando Zarrelli
Summary: Valsartan, a widely used antihypertensive drug, has been detected in high concentrations in surface waters due to its unchanged excretion and incomplete degradation in wastewater treatment plants. This study investigated the degradation of valsartan and identified 14 degradation byproducts. The acute and chronic toxicity of these byproducts were evaluated in key organisms in the freshwater trophic chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jiang Lin, Lianbao Chi, Qing Yuan, Busu Li, Mingbao Feng
Summary: This study investigated the photodegradation behavior and product formation of two representative pharmaceuticals in simulated estuary water. The study found that the formed transformation products of these pharmaceuticals have potential toxicity on marine organisms, including oxidative stress and damage to cellular components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hua Fang, Dongdong Jiang, Ye He, Siyi Wu, Yuehong Li, Ziqi Zhang, Haoting Chen, Zixin Zheng, Yan Sun, Wenxiang Wang
Summary: This study revealed that exposure to lower levels of air pollutants led to decreased pregnancy rates, with PM10, NO2, SO2, and CO emerging as the four most prominent pollutants. Individuals aged 35 and above exhibited heightened susceptibility to pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ali Shaan Manzoor Ghumman, Rashid Shamsuddin, Amin Abbasi, Mohaira Ahmad, Yoshiaki Yoshida, Abdul Sami, Hamad Almohamadi
Summary: In this study, inverse vulcanized polysulfides (IVP) were synthesized by reacting molten sulfur with 4-vinyl benzyl chloride, and then functionalized using N-methyl D-glucamine (NMDG). The functionalized IVP showed a high mercury adsorption capacity and a machine learning model was developed to predict the amount of mercury removed. Furthermore, the functionalized IVP can be regenerated and reused, providing a sustainable and cost-effective adsorbent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Rita Bonfiglio, Renata Sisto, Stefano Casciardi, Valeria Palumbo, Maria Paola Scioli, Erica Giacobbi, Francesca Servadei, Gerry Melino, Alessandro Mauriello, Manuel Scimeca
Summary: This study investigated the presence of aluminum in human colon cancer samples and its potential association with biological processes involved in cancer progression. Aluminum was found in tumor areas of 24% of patients and was associated with epithelial to mesenchymal transition (EMT) and cell death. Additional analyses revealed higher tumor mutational burden and mutations in genes related to EMT and apoptosis in aluminum-positive colon cancers. Understanding the molecular mechanisms of aluminum toxicity may improve strategies for the management of colon cancer patients.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)