Article
Environmental Sciences
Colleen M. Wardlaw, Patricia L. Corcoran, Bryan D. Neff
Summary: This study investigated microplastic abundance in demersal fishes in the Thames River, Ontario, Canada. The results showed higher microplastic levels in urban areas, and a positive correlation between microplastic abundance in fish and sediment. The body mass of the fish was also positively related to the number of microplastics found.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Yaru Qian, Yunxu Shang, Yixin Zheng, Yuqiao Jia, Feifei Wang
Summary: Freshwater rivers are crucial for providing drinking water sources and connecting oceans and lands. However, they can also serve as pathways for environmental pollutants, including microplastics, to contaminate drinking water. This study investigated the temporal and spatial variation of microplastics in a section of the Yellow River in China and found higher abundances in the wet season compared to the dry season. The predominant types of microplastics were influenced by regional precipitation, fishing activities, and improper disposal of plastic waste. The study highlighted the potential long-term threat of microplastics to drinking water safety and provided valuable information for evaluating the environmental impacts of degradable plastics.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Manisha Shakya, Ewen Silvester, Gavin Rees, Leigh Stitz, Aleicia Holland
Summary: The study found that acid mine drainage can lead to significant changes in the community composition and amino acid profiles of macroinvertebrates, resulting in significantly lower taxa richness at polluted sites. There were significant variations in the AA profiles among different taxa and different river sections, reflecting the response of macroinvertebrates to AMD contamination.
ENVIRONMENTAL POLLUTION
(2021)
Article
Ecology
Kimberly C. Yazzie, Christian E. Torgersen, Daniel E. Schindler, Gordon H. Reeves
Summary: Large wood (LW) is an important habitat-forming feature in rivers, but our understanding of its spatial and temporal dynamics remains incomplete. This study used an exceptional dataset from a coastal river in Oregon, USA, to characterize LW dynamics over a 12-year period. The results showed that LW density was higher in tributaries and exhibited higher temporal variation in the main stem. A major flood in 1996 homogenized the wood distribution but heterogeneity was reestablished within a few years.
Article
Engineering, Environmental
Yiqing Zhang, Azhar Rashid, Shanshan Guo, Yuanchun Jing, Qiaoting Zeng, Yan Li, Bob Adyari, Jun Yang, Lina Tang, Chang-Ping Yu, Qian Sun
Summary: The distribution and fate of contaminants of emerging concern (CECs) in the Houxi River were studied in relation to hydrological conditions, land use characteristics, and spatial contiguity. It was found that land use types related to anthropogenic activities were positively correlated with the presence and concentration of CECs. Significant annual variations were observed in both the concentrations and detection frequencies of CECs, with higher concentrations and detection frequencies downstream compared to upstream. Spatial variations were mainly influenced by downstream sites, and strong spatial autocorrelation was observed among connected sites. The results provide valuable insights for policymakers in managing and prioritizing CEC contaminants in the Houxi watershed.
Article
Water Resources
Gagan Matta, Avinash Kumar, Anjali Nayak, Pawan Kumar
Summary: This study aims to estimate the spatio-temporal variability of hydrology in the Ganga River System's upstream regions in the Himalayan Region of Uttarakhand state, India. The results revealed significant variations in water quality index, indicating a deterioration in water quality from good to moderate pollution level, and successfully identified pollution sources through principal component analysis.
APPLIED WATER SCIENCE
(2022)
Article
Environmental Sciences
Shibani Navasakthi, Anuvesh Pandey, Rahul Dandautiya, Murtaza Hasan, Mohammad Amir Khan, Kahkashan Perveen, Shamshad Alam, Rajni Garg, Obaid Qamar
Summary: The water quality of freshwater sources like rivers, lakes, and ponds is deteriorating due to increasing population and industrialization. This study analyzed water quality parameters in the Godavari basin, including temperature, pH, dissolved oxygen (DO), conductivity, biological oxygen demand (BOD), nitrate, and faecal coliform concentration. Data from the Central Pollution Control Board, India for 21 stations over five years were analyzed. The study found negative correlations between conductivity and DO, temperature and pH, and DO and faecal coliform. The analysis also revealed significant temporal variations in temperature, pH, and faecal coliform level. Overall, the study highlights the worsening water quality of the Godavari River over time.
Article
Environmental Sciences
Jingrui Sun, Weilong Du, Martyn C. Lucas, Chengzhi Ding, Jinnan Chen, Juan Tao, Daming He
Summary: River barriers, including large dams and small-scale barriers, have a significant impact on fish habitats and can lead to population decline or extinction. Previous studies in the Mekong basin have focused mainly on large dams and neglected the effects of small-scale barriers. The completeness of existing barrier databases was tested, and a comprehensive database was created for the Upper Mekong. The study found that a large percentage of river barriers were absent from existing databases, with small-scale barriers being particularly overlooked. The presence of barriers was found to contribute to fragmentation within the catchment, impacting fish species distribution.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Geography, Physical
Mengmeng Hong, Juanle Wang, Baomin Han
Summary: Under the pressure of SDG15.3.1 compliance, addressing land salinization degradation in the Yellow River Basin is crucial due to its role as China's granary. A salinization inversion model was constructed for each zoning unit in the basin based on geographical factors, and a feature space inversion process was utilized for automatic salinization inversion using the Google Earth Engine platform. The resulting salinization distribution maps of the basin in 2015 and 2020 were analyzed, along with the causes and spatiotemporal variations of salinization, leading to proposed prevention and control suggestions. This study can be expanded to larger and more complex geographical regions.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2023)
Article
Biodiversity Conservation
Chanjuan Zan, Tie Liu, Yue Huang, Anming Bao, Yuyan Yan, Yunan Ling, Zheng Wang, Yongchao Duan
Summary: This study analyzed the spatial and temporal patterns of wetland changes in the Aral Sea Delta in Central Asia. The results showed that the wetland area has increased due to human activities such as agricultural expansion and construction of reservoirs and irrigation canals. This increase in wetland area contrasts with the drying up of the Aral Sea and has negative implications for ecological restoration.
ECOLOGICAL INDICATORS
(2022)
Article
Ecology
Tyler J. Orgon, Andrew W. Hafs, Carl W. Isaacson, Shane E. Bowe
Summary: This study investigated the total mercury concentrations in Walleye fish from Upper and Lower Red Lakes in Minnesota between 2019 and 2020. The results showed that the mercury concentrations in Walleye varied from 0.030 mg/kg to 0.564 mg/kg. The study also found a significant difference in mercury concentrations between the two lakes.
Article
Environmental Studies
Xichen Che, Liang Jiao, Xuli Zhu, Jingjing Wu, Qian Li
Summary: The water conservation function of Gannan in the upper Yellow River Basin was quantitatively assessed using the InVEST model. The results showed an overall increasing trend in water conservation capacity from 2000 to 2020. The spatial distribution of water conservation varied from year to year, with high degrees in the southwest and low degrees in the northeast. Climatic factors were found to be the dominant factors underlying the spatial and temporal distribution of water conservation in Gannan.
Article
Ornithology
J. Duckworth, S. O'Brien, I. K. Petersen, A. Petersen, G. Benediktsson, L. Johnson, P. Lehikoinen, D. Okill, R. Vaisanen, J. Williams, S. Williams, F. Daunt, J. A. Green
Summary: Environmental conditions can greatly impact animal behaviors, especially in species with large ranges. The red-throated diver shows adaptability in foraging strategies across different geographic regions. Diving behaviors of the birds vary during the breeding season, with shifts in prey preferences or movements being observed.
JOURNAL OF AVIAN BIOLOGY
(2021)
Article
Environmental Sciences
Hui-zhen Duan, Dong Zhang, Zhi-qi Zhao, Hao Jiang, Cong Zhang, Xing-yu Huang, Bing-juan Ma, Qing-jun Guo
Summary: This study used isotope mixing models to calculate the variability of anthropogenic sulfate inputs in the Yihe River Basin in China, and found that acid mine drainage is a major source. The study also found that climate change has led to a decrease in riverine sulfate flux, but the changes in sulfate concentration and isotope values are not proportional.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Studies
Lei Chang, Ying Li, Keyi Zhang, Jialin Zhang, Yuefen Li
Summary: This study analyzed the spatial and temporal variations of vegetation and their influencing factors in the Songliao River Basin from 2000 to 2020. The results showed that the vegetation in the basin exhibited a greening trend, with climatic factors and soil type being the dominant factors affecting vegetation distribution. The interaction between influencing factors was enhanced, and population density was found to have a significant impact on vegetation changes. The study also focused on the spatial differentiation of vegetation changes and influencing factors in sub-basins.