5,308 results match your criteria stream regions


The spatiotemporal variations and propagation of droughts in Plateau Mountains of China.

Sci Total Environ 2021 Sep 10;805:150257. Epub 2021 Sep 10.

Center for Hydrometeorology and Remote Sensing (CHRS), The Henry Samueli School of Engineering, Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697, USA.

Drought incidents and the pressure on water resources have increased in recent years, which has threatened sustainable development. Recently, research has been conducted on drought propagation. However, few studies have investigated the characteristics and mechanisms of drought propagation in plateau mountainous regions with complex topography, which limits the efforts to mitigate drought. Read More

View Article and Full-Text PDF
September 2021

Reexamining the Neural Network Involved in Perception of Facial Expression: A Meta-analysis.

Neurosci Biobehav Rev 2021 Sep 15. Epub 2021 Sep 15.

State Key Laboratory of Brain and Cognitive Science, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101, China; Department of Psychology, University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address:

Perception of facial expression is essential for social interactions. Although a few competing models have enjoyed some success to map brain regions, they are also facing difficult challenges. The current study used an updated activation likelihood estimation (ALE) method of meta-analysis to explore the involvement of brain regions in facial expression processing. Read More

View Article and Full-Text PDF
September 2021

OTNet: A CNN Method Based on Hierarchical Attention Maps for Grading Arteriosclerosis of Fundus Images with Small Samples.

Interdiscip Sci 2021 Sep 18. Epub 2021 Sep 18.

China Aerospace Science and Industry Corporation, Beijing, China.

The severity of fundus arteriosclerosis can be determined and divided into four grades according to fundus images. Automatically grading of the fundus arteriosclerosis is helpful in clinical practices, so this paper proposes a convolutional neural network (CNN) method based on hierarchical attention maps to solve the automatic grading problem. First, we use the retinal vessel segmentation model to separate the important vascular region and the non-vascular background region from the fundus image and obtain two attention maps. Read More

View Article and Full-Text PDF
September 2021

Land use/land cover change and ecosystem services in the Bagmati River Basin, Nepal.

Environ Monit Assess 2021 Sep 15;193(10):651. Epub 2021 Sep 15.

Centre for Planetary Health and Food Security, Griffith School of Environment and Science, Griffith University, Nathan, QLD, 4111, Australia.

Delivery of ecosystem services is strongly affected by changes in the land use/land cover (LULC) of an area. In this study, we analyze spatiotemporal changes in LULC of the rapidly changing Bagmati River Basin (BRB) of Nepal during 1988-2018 using Landsat satellite images. We also quantify carbon storage in different physiographic regions and LULC classes using the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model and assess economic valuation of carbon using the benefit transfer method. Read More

View Article and Full-Text PDF
September 2021

Taxon-specific sensitivities to flow intermittence reveal macroinvertebrates as potential bioindicators of intermittent rivers and streams.

Sci Total Environ 2021 Aug 31;804:150022. Epub 2021 Aug 31.

Department of Biology and Ecology, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia. Electronic address:

As complex mosaics of lotic, lentic, and terrestrial habitats, intermittent rivers and ephemeral streams (IRES) support high biodiversity. Despite their ecological importance, IRES are poorly represented in routine monitoring programs, but recent recognition of their considerable-and increasing-spatiotemporal extent is motivating efforts to better represent IRES in ecological status assessments. We examine response patterns of aquatic macroinvertebrate communities and taxa to flow intermittence (FI) across three European climatic regions. Read More

View Article and Full-Text PDF

Delta variant and black fungal invasion: A bidirectional assault might worsen the massive second/third stream of COVID-19 outbreak in South-Asia.

Ethics Med Public Health 2021 Dec 4;19:100722. Epub 2021 Sep 4.

Department of Pharmacy, BGC Trust University Bangladesh, Chittagong 4381, Bangladesh.

Background: Here, we have shortly reported the recent updates on the disastrous progressions of the deadly delta variant and a virulent coinfection or post-COVID-19 infection of black fungus in India and its neighbouring countries.

Methodology: We searched by utilizing appropriate keywords in Google Scholar, PubMed and other scholarly databases alongside several national and international newspapers to collect the latest data regarding the targeted topic.

Results: Recently, the delta variant is wreaking havoc in India, UK, and other countries around the globe and has also exhibited successful infections in around 20 to 55% of the people who have already recovered from COVID-19 originating from the different strains. Read More

View Article and Full-Text PDF
December 2021

Metabolomics of lung microdissections reveals region- and sex-specific metabolic effects of acute naphthalene exposure in mice.

Toxicol Sci 2021 Sep 8. Epub 2021 Sep 8.

Genome Center, University of California Davis, Davis, California.

Naphthalene is a ubiquitous environmental contaminant produced by combustion of fossil fuels and is a primary constituent of both mainstream and side stream tobacco smoke. Naphthalene elicits region-specific toxicity in airway club cells through cytochrome P450 (P450)-mediated bioactivation, resulting in depletion of glutathione and subsequent cytotoxicity. While effects of naphthalene in mice have been extensively studied, few experiments have characterized global metabolomic changes in the lung. Read More

View Article and Full-Text PDF
September 2021

EXPRESS: Estimating the Effects of Trait Knowledge on Social Perception.

Q J Exp Psychol (Hove) 2021 Sep 7:17470218211047447. Epub 2021 Sep 7.

Department of Psychology, Macquarie University, Sydney, NSW 2109, Australia 7788.

Research in social cognition has predominantly investigated perceptual and inferential processes separately, however real-world social interactions usually involve integration between person inferences (e.g., generous, selfish) and the perception of physical appearance (e. Read More

View Article and Full-Text PDF
September 2021

Determining the microbial and chemical contamination in Ecuador's main rivers.

Sci Rep 2021 Sep 3;11(1):17640. Epub 2021 Sep 3.

Instituto de Microbiología, Colegio de Ciencias Biológicas y Ambientales (COCIBA), Universidad San Francisco de Quito (USFQ), Diego de Robles y Vía Interoceánica, Campus Cumbayá, Casilla Postal 17-1200-841, Quito, 170901, Ecuador.

One major health issue is the microbial and chemical contamination of natural freshwater, particularly in Latin American countries, such as Ecuador, where it is still lacking wastewater treatment plants. This study analyzed the water quality in twelve rivers of Ecuador (Coastal, Andean, and Amazonian regions). All rivers showed levels of E. Read More

View Article and Full-Text PDF
September 2021

The threat of freshwater input on sandy beaches: A small-scale approach to assess macrofaunal changes related to salinity reduction.

Mar Environ Res 2021 Aug 26;171:105459. Epub 2021 Aug 26.

Oceanographic Institute - University of São Paulo (IO-USP), Praça do Oceanográfico, 191, 05508-120, Cidade Universitária, São Paulo, SP, Brazil.

Increased rainfall has become a key threat in recent decades for subtropical coastal regions. On sandy beaches that are associated with streams and rivers, the intensification of freshwater inputs is expected to reduce the salinity of interstitial waters and affect benthic biodiversity. Large freshwater gradients are promoted by river mouths and also change beach morphodynamic and sediment organic contents, which are covariates that have hindered the understanding of salinity-specific effects on benthic species in previous studies. Read More

View Article and Full-Text PDF

How EU policies could reduce nutrient pollution in European inland and coastal waters.

Glob Environ Change 2021 Jul;69:102281

Seidor, Barcelona, Spain.

Intensive agriculture and densely populated areas represent major sources of nutrient pollution for European inland and coastal waters, altering the aquatic ecosystems and affecting their capacity to provide ecosystem services and support economic activities. Ambitious water policies are in place in the European Union (EU) for protecting and restoring aquatic ecosystems under the Water Framework Directive and the Marine Strategy Framework Directive. This research quantified the current pressures of point and diffuse nitrogen and phosphorus emissions to European fresh and coastal waters (2005-2012), and analysed the effects of three policy scenarios of nutrient reduction: 1) the application of measures currently planned in the Rural Development Programmes and under the Urban Waste Water Treatment Directive (UWWTD); 2) the full implementation of the UWWTD and the absence of derogations in the Nitrates Directive; 3) high reduction of nutrient, using best technologies in wastewaters treatment and optimal fertilisation in agriculture. Read More

View Article and Full-Text PDF

Long-term data reveal unimodal responses of ground beetle abundance to precipitation and land use but no changes in taxonomic and functional diversity.

Sci Rep 2021 Sep 1;11(1):17468. Epub 2021 Sep 1.

Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum Frankfurt, Gelnhausen, Germany.

While much of global biodiversity is undoubtedly under threat, the responses of ecological communities to changing climate, land use intensification, and long-term changes in both taxonomic and functional diversity over time, has still not been fully explored for many taxonomic groups, especially invertebrates. We compiled time series of ground beetles covering the past two decades from 40 sites located in five regions across Germany. We calculated site-based trends for 21 community metrics representing taxonomic and functional diversity of ground beetles, activity density (a proxy for abundance), and activity densities of functional groups. Read More

View Article and Full-Text PDF
September 2021

Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon.

PLoS One 2021 1;16(9):e0256273. Epub 2021 Sep 1.

United States Forest Service, Missoula, Montana, United States of America.

Illegal cannabis cultivation on public lands has emerged as a major threat to wildlife in California and southern Oregon due to the rampant use of pesticides, habitat destruction, and water diversions associated with trespass grow sites. The spatial distribution of cultivation sites, and the factors influencing where they are placed, remain largely unknown due to covert siting practices and limited surveillance funding. We obtained cannabis grow-site locality data from law enforcement agencies and used them to model the potential distribution of cultivation sites in forested regions of California and southern Oregon using maximum entropy (MaxEnt) methods. Read More

View Article and Full-Text PDF
September 2021

Individual differences in representational similarity of first and second languages in the bilingual brain.

Hum Brain Mapp 2021 Sep 1. Epub 2021 Sep 1.

Brain and Mind Institute, The University of Western Ontario, London, Canada.

Current theories of bilingualism disagree on the extent to which separate brain regions are used to maintain or process one's first and second language. The present study took a novel multivariate approach to address this question. We examined whether bilinguals maintain distinct neural representations of two languages; specifically, we tested whether brain areas that are involved in processing word meaning in either language are reliably representing each language differently, and whether language representation is influenced by individual differences in proficiency level and age of acquisition (AoA) of L2. Read More

View Article and Full-Text PDF
September 2021

Genomic data and multi-species demographic modelling uncover past hybridization between currently allopatric freshwater species.

Heredity (Edinb) 2021 Aug 30. Epub 2021 Aug 30.

cE3c-Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal.

Evidence for ancient interspecific gene flow through hybridization has been reported in many animal and plant taxa based on genetic markers. The study of genomic patterns of closely related species with allopatric distributions allows the assessment of the relative importance of vicariant isolating events and past gene flow. Here, we investigated the role of gene flow in the evolutionary history of four closely related freshwater fish species with currently allopatric distributions in western Iberian rivers-Squalius carolitertii, S. Read More

View Article and Full-Text PDF

Visualization of the Anisotropy of the Velocity Dispersion and Characteristics of the Multi-Velocity Continuum in the Regions of Multi-Stream Flows of Gas-Dust Media with Polydisperse Dust.

J Imaging 2020 Sep 17;6(9). Epub 2020 Sep 17.

Institute of Mathematics and Information Technology, Volgograd State University, Universitetskij Prospekt, 100, 400062 Volgograd, Russia.

Collisionless media devoid of intrinsic stresses, for example, a dispersed phase in a multiphase medium, have a much wider variety of space-time structures and features formed in them than collisional media, for example, a carrier, gas, or liquid phase. This is a consequence of the fact that evolution in such media occurs in phase space, i.e. Read More

View Article and Full-Text PDF
September 2020

Physical and chemical control on CO gas transfer velocities from a low-gradient subtropical stream.

Water Res 2021 Aug 15;204:117564. Epub 2021 Aug 15.

Key Laboratory of Karst Dynamics, MNR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China.

CO exchanges across the water-air interface in rivers and lakes are currently believed to be responsible for the dominant share of global aquatic CO emissions. The gas transfer velocity (k) is the key factor that constrains the CO fluxes. It is also the most problematic to establish because of its high spatial and temporal variability. Read More

View Article and Full-Text PDF

The complete chloroplast genome sequence of (bambusodae).

Mitochondrial DNA B Resour 2021 24;6(9):2748-2749. Epub 2021 Aug 24.

College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, PR China.

(local name: Hua Zhu) is found in Zhejiang, Jiangxi, Fujian, Taiwan, and Guangdong provinces of China, and is often cultivated on low hills, flatlands, and along streams and rivers. Due to its long internodes and flexible material, it is used as timber wood in China. In the current research, the complete chloroplast (CP) genome of was sequenced and reported for the first time. Read More

View Article and Full-Text PDF

Environmental Surveillance and Characterization of Antibiotic Resistant at Coastal Beaches and Rivers on the Island of Hawai'i.

Antibiotics (Basel) 2021 Aug 13;10(8). Epub 2021 Aug 13.

Marine Science Department, University of Hawai'i at Hilo, Hilo, HI 96720, USA.

are human facultative pathogenic bacteria and can be found as contaminants in the environment. The aim of our study was to determine whether methicillin-resistant (MRSA) and methicillin-susceptible (MSSA) isolated from coastal beach and river waters, anchialine pools, sand, and wastewater on the island of Hawai'i, Hawai'i, are a potential health risk. Samples were collected from three regions on Hawai'i Island from July to December 2020 during the COVID-19 pandemic and were characterized using whole-genome sequencing (WGS). Read More

View Article and Full-Text PDF

Chronological Trends and Mercury Bioaccumulation in an Aquatic Semiarid Ecosystem under a Global Climate Change Scenario in the Northeastern Coast of Brazil.

Animals (Basel) 2021 Aug 13;11(8). Epub 2021 Aug 13.

CESAM-Centre for Environmental and Marine Studies, Department of Biology, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal.

Due to global warming, in the northeastern semiarid coastal regions of Brazil, regional and global drivers are responsible for decreasing continental runoff and increasing estuarine water residence time, which promotes a greater mobilization of bioavailable mercury (Hg) and allows increasing fluxes and/or bioavailability of this toxic trace element and an acceleration of biogeochemical transformation of Hg. In this work, an application of dendrochemistry analysis (annular tree rings analysis) was developed for the reconstruction of the historical pattern of mercury contamination in a contaminated area, quantifying chronological Hg contamination trends in a tropical semiarid ecosystem (Ceará River Estuary, northeastern coast of Brazil) through registration of mercury concentration on growth rings in specimens of L. and using the assessment in sediments as a support for the comparison of profiles of contamination. Read More

View Article and Full-Text PDF

Effects of Mining Activities on the Distribution, Controlling Factors, and Sources of Metals in Soils from Xikuangshan South Mine, Hunan Province.

Integr Environ Assess Manag 2021 Aug 26. Epub 2021 Aug 26.

School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China.

In this study, we analyzed 53 topsoil samples from Xikuangshan South Mine in Hunan Province to investigate the distribution characteristics of pH and the concentrations of selected metals, to determine the controlling factors and identify their sources. Kriging interpolation, correlation analysis, principal component analysis, the index of the geoaccumulation index, and Hakanson's potential ecological risk were applied. The results show that the mean values of Pb, As, Cd and Sb in the study area were larger than the background value of mountain soil in Hunan Province, and only the average Cr concentration was slightly lower than the background value. Read More

View Article and Full-Text PDF

Predicted distribution of a rare and understudied forest carnivore: Humboldt marten ().

PeerJ 2021 21;9:e11670. Epub 2021 Jul 21.

Pacific Northwest Region, USDA Forest Service, Corvallis, OR, United States of America.

Background: Many mammalian species have experienced range contractions. Following a reduction in distribution that has resulted in apparently small and disjunct populations, the Humboldt marten () was recently designated as federally Threatened and state Endangered. This subspecies of Pacific marten occurring in coastal Oregon and northern California, also known as coastal martens, appear unlike martens that occur in snow-associated regions in that vegetation associations appear to differ widely between Humboldt marten populations. Read More

View Article and Full-Text PDF

Nonlinear shifts in infectious rust disease due to climate change.

Nat Commun 2021 08 24;12(1):5102. Epub 2021 Aug 24.

Department of Environmental Science Policy and Management, University of California, Berkeley, Berkeley, CA, USA.

Range shifts of infectious plant disease are expected under climate change. As plant diseases move, emergent abiotic-biotic interactions are predicted to modify their distributions, leading to unexpected changes in disease risk. Evidence of these complex range shifts due to climate change, however, remains largely speculative. Read More

View Article and Full-Text PDF

Metal lability and environmental risk in anthropogenically disturbed Antarctic melt streams.

Environ Pollut 2021 Oct 19;287:117627. Epub 2021 Jun 19.

CSIRO Land and Water, Lucas Heights, NSW, Australia.

Antarctic melt streams are important ecosystems that increasingly face contaminant pressures from anthropogenic sources. Metal contaminants are often reported in the limno-terrestrial environment but their speciation is not well characterised, making environmental risk assessments difficult. This paper characterises labile metal concentrations in five melt streams and three shallow lakes around the Casey and Wilkes research stations in East Antarctica using chemical extracts and field deployments of diffusive gradients in thin-film (DGT) samplers. Read More

View Article and Full-Text PDF
October 2021

A comparative review of microplastics in lake systems from different countries and regions.

Chemosphere 2021 Aug 5;286(Pt 2):131806. Epub 2021 Aug 5.

Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, Henan, 450001, China. Electronic address:

Microplastics, as defined here as plastics with a diameter of <5 mm, can impose severely detrimental impacts on the environment and can now be commonly found in different water bodies. To date, the status of microplastics in limnic systems, which have different hydrologic systems compared to other water bodies such as oceans or rivers, has rarely been reviewed. In the present study, the microplastic pollutants in different countries and regions were comparatively investigated in terms of their abundances, morphologies, and polymer types in the water and sediments of lakes. Read More

View Article and Full-Text PDF

SARS-CoV-2 in a stream running through an underprivileged, underserved, urban settlement in São Paulo, Brazil: A 7-month follow-up.

Environ Pollut 2021 Aug 19;290:118003. Epub 2021 Aug 19.

Department of Infectious Diseases and Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, Brazil.

COVID-19 pandemic has led to concerns on the circulation of SARS-CoV-2 in the environment, its infectivity from the environment and, the relevance of transmission via environmental compartments. During 31 weeks, water samples were collected from a heavily contaminated stream going through an urban, underprivileged community without sewage collection. Our results showed a statistically significant correlation between cases of COVID-19 and SARS in the community, and SARS-CoV-2 concentrations in the water. Read More

View Article and Full-Text PDF

[Temporal and Spatial Variations in Water Quality of Hanjiang River and Its Influencing Factors in Recent Years].

Huan Jing Ke Xue 2021 Sep;42(9):4211-4221

Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

Hanjiang River is the main water source and influence area of the Middle Route of the South to North Water Transfer Project. In recent years, the water quality and ecological environment in the middle and lower reaches of the Hanjiang River has become seriously degraded and water blooms occur frequently. Scientific identification of the temporal and spatial variations in water environment quality (and the main driving factors) has become an important management requirement for optimizing the upstream water transfer project. Read More

View Article and Full-Text PDF
September 2021

Nitrogen processing by treatment wetlands in a tropical catchment dominated by agricultural landuse.

Mar Pollut Bull 2021 Aug 14;172:112800. Epub 2021 Aug 14.

Australian Rivers Institute, Griffith University, Nathan 4111, QLD, Australia. Electronic address:

Agriculture is a major contributor to marine nitrogen pollution, and treatment wetlands can be a strategy to reduce it. However, few studies have assessed the potential of treatment wetlands to mitigate nitrogen pollution in tropical regions. We quantify the nitrogen removal rates of four recently constructed treatment wetlands in tropical Australia. Read More

View Article and Full-Text PDF

Multiple in-stream stressors degrade biological assemblages in five U.S. regions.

Sci Total Environ 2021 Jul 31;800:149350. Epub 2021 Jul 31.

U.S. Geological Survey, Texas Water Science Center, Austin, TX 78754, USA.

Biological assemblages in streams are affected by a wide variety of physical and chemical stressors associated with land-use development, yet the importance of combinations of different types of stressors is not well known. From 2013 to 2017, the U.S. Read More

View Article and Full-Text PDF

Self-fulfillment degree of construction and demolition waste management capability based on the Triple-balance theory: A case study of Guangdong-Hong Kong-Macao Greater Bay Area.

Waste Manag 2021 Sep 11;133:99-109. Epub 2021 Aug 11.

School of Architecture and Built Environment, The University of Adelaide, Room 472, SA 5001, Australia. Electronic address:

Construction and demolition waste (C&DW) has become part of the largest waste stream globally and many cities are facing the shortage of management capability to treat C&DW. These cities seek to transport their C&DW to their neighbor cities for recycling or landfilling, which is recognized as the cross-regional management of C&DW. However, there were few studies to investigate the mechanism of cross-regional mobility in C&DW field. Read More

View Article and Full-Text PDF
September 2021