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https://www.readbyqxmd.com/read/28806705/multiparametric-monitoring-of-microbial-faecal-pollution-reveals-the-dominance-of-human-contamination-along-the-whole-danube-river
#1
A K T Kirschner, G H Reischer, S Jakwerth, D Savio, S Ixenmaier, E Toth, R Sommer, R L Mach, R Linke, A Eiler, S Kolarevic, A H Farnleitner
The microbial faecal pollution of rivers has wide-ranging impacts on a variety of human activities that rely on appropriate river water quality. Thus, detailed knowledge of the extent and origin of microbial faecal pollution is crucial for watershed management activities to maintain safe water use. In this study, the microbial faecal pollution levels were monitored by standard faecal indicator bacteria (SFIB) along a 2580 km stretch of the Danube, the world's most international river, as well as the Danube's most important tributaries...
July 22, 2017: Water Research
https://www.readbyqxmd.com/read/28806677/influence-of-the-residue-from-an-iron-mining-dam-in-the-growth-of-two-macrophyte-species
#2
F Bottino, J A M Milan, M B Cunha-Santino, I Bianchini
On November 5th, 2015 the worst environmental disaster in Brazil spilled 60 million m(3) of iron mining residue into Gualaxo do Norte River (Minas Gerais State), an affluent of the highest River Basin of the Brazilian Southeast (Doce River Basin), reaching the Atlantic Ocean. To assess the impact of the iron residue on the aquatic plant metabolism, we performed macrophyte growth experiments under controlled light and temperature conditions using two species (Egeria densa and Chara sp.). The plants' growth data were fitted in a kinetic model to obtain the biomass yields (K) and growth rates (μ)...
August 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806554/metal-bioaccumulation-and-biomarkers-of-effects-in-caged-mussels-exposed-in-the-athabasca-oil-sands-area
#3
M Pilote, C André, P Turcotte, F Gagné, C Gagnon
The Athabasca oil sands deposit is the world's largest known reservoir of crude bitumen and the third-largest proven crude oil reserve. Mining activity is known to release contaminants, including metals, and to potentially impact the aquatic environment. The purpose of this study was to determine the impacts of oil sands mining on water quality and metal bioaccumulation in mussels from the Fort McMurray area in northern Alberta, Canada. The study presents two consecutive years of contrasting mussel exposure conditions (low and high flows)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806551/effects-of-agricultural-land-use-on-fluvial-carbon-dioxide-methane-and-nitrous-oxide-concentrations-in-a-large-european-river-the-meuse-belgium
#4
A V Borges, F Darchambeau, T Lambert, S Bouillon, C Morana, S Brouyère, V Hakoun, A Jurado, H-C Tseng, J-P Descy, F A E Roland
We report a data-set of CO2, CH4, and N2O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013, 2014 and 2015), from yearly cycles in four rivers of variable size and catchment land cover, and from 111 groundwater samples. Surface waters of the Meuse river network were over-saturated in CO2, CH4, N2O with respect to atmospheric equilibrium, acting as sources of these greenhouse gases to the atmosphere, although the dissolved gases also showed marked seasonal and spatial variations...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806545/improvement-of-the-drought-indicators-system-in-the-j%C3%A3%C2%BAcar-river-basin-spain
#5
Tatiana Ortega-Gómez, Miguel A Pérez-Martín, Teodoro Estrela
Droughts are one of the gravest natural threats currently existing in the world and their occurrence and intensity might be exacerbated in the coming years due to climate change. The severe impacts that droughts cause to inland water resources and to the associated socio-economic activities justify the continuous monitoring of the drought. The case study presented shows a practical application of a distributed drought monitoring system implemented in a real river basin district, the Júcar River Basin District (43,000km(2)), where drought periods of marked intensity have occurred historically and the climate ranges from humid in the north to semiarid in the south...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806081/chlorination-kinetics-of-11-nor-9-carboxy-%C3%AE-9-tetrahydrocannabinol-effects-of-ph-and-humic-acid
#6
Allison L Mackie, Yuri Park, Graham A Gagnon
The main psychoactive compound in marijuana, Δ9-tetrahydrocannabinol (THC), and its metabolites are emerging organic contaminants that have been detected in waste and surface waters. As legalization of marijuana for medical and recreational use continues, the effects of increased use and potency of marijuana on water and wastewater treatment processes and the environment should be considered. This study examined degradation kinetics of the main urinary metabolite of THC, 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THC-COOH) with chlorine...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28805294/microplastics-alter-composition-of-fungal-communities-in-aquatic-ecosystems
#7
Marie Therese Kettner, Keilor Rojas-Jimenez, Sonja Oberbeckmann, Matthias Labrenz, Hans-Peter Grossart
Despite increasing concerns about microplastic (MP) pollution in aquatic ecosystems, there is insufficient knowledge on how MP affect fungal communities. In this study, we explored the diversity and community composition of fungi attached to polyethylene (PE) and polystyrene (PS) particles incubated in different aquatic systems in north-east Germany: the Baltic Sea, the River Warnow and a wastewater treatment plant. Based on next generation 18S rRNA gene sequencing, 347 different operational taxonomic units assigned to 81 fungal taxa were identified on PE and PS...
August 14, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28803424/nitrate-pollution-in-the-warta-river-poland-between-1958-and-2016-trends-and-causes
#8
Józef Górski, Krzysztof Dragon, Piotr Michał Jan Kaczmarek
The article presents analyses of long-term water quality data from the Warta River between 1958 and 2016. A clear increasing trend in nitrate concentrations was observed from 1958 to the early 1990s. This trend was mainly related to the increasing use of fertilizers in Poland in this period. Then, after the early 1990s, a slow decreasing trend related to improvements in water and sewage management and more rational fertilizer use was observed after political and economic changes in Poland. The influence of long-term hydrological droughts on nitrate concentrations was also investigated...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803200/ecological-state-of-a-mountain-river-before-and-after-a-large-flood-implications-for-river-status-assessment
#9
Hanna Hajdukiewicz, Bartłomiej Wyżga, Antoni Amirowicz, Paweł Oglęcki, Artur Radecki-Pawlik, Joanna Zawiejska, Paweł Mikuś
Assessment of the ecological status of rivers is key to monitoring the achievement of the environmental goal of the EU Water Framework Directive and the success of restoration projects. In summer of 2009 and 2010, repeated assessments of physical habitat conditions and of fish and benthic invertebrate communities were performed at low-flow conditions in 10 unmanaged and 10 channelized cross-sections of the Biała River, Polish Carpathians. Between the two surveys, an 80-year flood occurred, significantly affecting habitat characteristics and river communities...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28803193/a-detailed-risk-assessment-of-shale-gas-development-on-headwater-streams-in-the-pennsylvania-portion-of-the-upper-susquehanna-river-basin-u-s-a
#10
Kelly O Maloney, John A Young, Stephen P Faulkner, Atesmachew Hailegiorgis, E Terrence Slonecker, Lesley E Milheim
The development of unconventional oil and gas (UOG) involves infrastructure development (well pads, roads and pipelines), well drilling and stimulation (hydraulic fracturing), and production; all of which have the potential to affect stream ecosystems. Here, we developed a fine-scaled (1:24,000) catchment-level disturbance intensity index (DII) that included 17 measures of UOG capturing all steps in the development process (infrastructure, water withdrawals, probabilistic spills) that could affect headwater streams (<200km(2) in upstream catchment) in the Upper Susquehanna River Basin in Pennsylvania, U...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28803052/difference-in-attenuation-among-mn-as-and-fe-in-riverbed-sediments
#11
Saikat Sengupta, Ondra Sracek, Jiin-Shuh Jean, Huai-Jen Yang, Chung-Ho Wang, Sandeep Kar, Ondra Babek, Chi-Yuh Lee, Suvendu Das
We report, for the first time, a detailed study at river water and hyporheic zone systems through collection and analyses of shallow sediments and selected source rocks, pore water, and river water from forty-two locations at the Chianan Plain (CP), SW Taiwan. The study was focused to understand the possible changes in the river water and sediment chemistry as a consequence of high arsenic (mean±SD=71.28±16.24μg/L, n=46) groundwater discharge to three major rivers in the plain. The study shows, except few locations, As concentration in river sediments corresponds to average As concentration in soil and upper crustal abundance and of source rock...
July 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28802657/occurrence-of-pharmaceuticals-and-uv-filters-in-riverine-run-offs-and-waters-of-the-german-baltic-sea
#12
Kathrin Fisch, Joanna J Waniek, Detlef E Schulz-Bull
The occurrence of pharmaceuticals and personal care products (PPCPs) in the marine environment is of great concern. This study was done to determine the emergence of eight pharmaceuticals and eleven ultraviolet filters (UV-Filters) in 5 rivers/streams discharging into the Baltic Sea. Furthermore, a focus was put on the influence of wastewater treatment plant as indirect source and the occurrence of the PPCPs in close beach proximity. Two pharmaceuticals (sulfamethoxazole, salicylic acid) and two UV-filters (2-phenylbenzimidazole-5-sulfonic acid, octocrylene) were detected in all analyzed water samples, with concentration ranging from 0...
August 9, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28801585/inputs-of-humic-fluorescent-dissolved-organic-matter-via-submarine-groundwater-discharge-to-coastal-waters-off-a-volcanic-island-jeju-korea
#13
Jeonghyun Kim, Guebuem Kim
The abundance of fluorescent dissolved organic matter (FDOM) in the surface ocean plays a critical role in the growth of marine microorganisms and corals by affecting the optical properties (i.e., the penetration of UV radiation) of seawater. In general, it is known that rivers are the main source of FDOM to surface ocean waters. Here, however, we show that the concentrations of FDOM in coastal seawater off a volcanic island, Jeju, Korea, are dependent primarily on submarine groundwater discharge (SGD). Based on a significant correlation between (222)Rn and salinity in seawater, fresh groundwater was found to be the main source of groundwater as well as fresh water in the bay...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800911/distribution-profiles-of-per-and-poly-fluoroalkyl-substances-pfass-and-their-re-regulation-by-ocean-currents-in-the-east-and-south-china-sea
#14
Hongyuan Zheng, Feng Wang, Zhen Zhao, Yuxin Ma, Haizhen Yang, Zhibo Lu, Minggang Cai, Minghong Cai
We investigated the distribution of 17 individual per- and polyfluoroalkyl substances (PFASs) in 42 surface water samples collected from the East and South China Seas (7.0-36.0°N, 110.0°N-123.0°E). Concentrations of 7 individual PFASs, including perfluorobutane sulfonate (PFBS), perfluorohexane sulfonate (PFHxS), perfluoropentanoic acid (PFPA), perfluorohexanoate (PFHxA), perfluoroheptanoate (PFHpA), perfluorooctanoic acid (PFOA), and perfluorooctane sulfonamide (FOSA), were quantified in the East China Sea, but only concentrations of PFOA and FOSA were quantified in the South China Sea...
August 9, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28800685/occurrence-and-ecological-hazard-assessment-of-selected-antibiotics-in-the-surface-waters-in-and-around-lake-honghu-china
#15
Zhi Wang, Yun Du, Chao Yang, Xi Liu, Junqian Zhang, Enhua Li, Qing Zhang, Xuelei Wang
The occurrence and temporal-spatial distributions of 13 antibiotics (tetracyclines, sulfonamides, and fluoroquinolones) in the water of a high-intensity aquaculture lake, Honghu Lake, and its associated river network and ponds were investigated. Tetracycline, oxytetracycline, chlortetracycline, and sulfadiazine are the four dominant antibiotics in this region, with maximum and median concentrations of 1454.8 and 304.8ng/L, 2796.6 and 161.9ng/L, 1431.3 and 349.9ng/L, and 499.5 and 106.5ng/L, respectively. The median concentrations of the other nine antibiotics are lower than 57...
August 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28799935/effects-of-toxic-microcystis-genotypes-on-natural-colony-formation-and-mechanism-involved
#16
Xiangdong Bi, Wei Dai, Shulin Zhang, Shaojie Dong, Dajuan Zhang
The cyanobacterium Microcystis occurs as colonies of different sizes with varying abundance of toxic genotypes versus non-toxic genotypes under natural conditions. To investigate the effects of toxic Microcystis genotypes on natural colony formation, samples collected from the mainstream of Haihe River from July to October 2015 were sieved into four colony classes with sizes of <8 μm, 8-20 μm, 20-90 μm and >90 μm. Each colony size class was analyzed for the proportion of toxic Microcystis genotypes, and microcystins (MCs) cellular production of toxic genotypes...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28797668/salinity-stress-enhancing-basal-and-induced-immune-responses-in-striped-catfish-pangasianodon-hypophthalmus-sauvage
#17
Mélodie Schmitz, Tamar Ziv, Arie Admon, Sébastien Baekelandt, Syaghalirwa N M Mandiki, Maëlenn L'Hoir, Patrick Kestemont
In the Mekong Delta, striped catfish are faced with chronic salinity stress related to saltwater intrusion induced by global climatic changes. In this study, striped catfish juveniles were submitted to a prolonged salinity stress (up to 10ppt) over three weeks followed by infection with a virulent bacterial strain, Edwardsiella ictaluri. Osmoregulatory parameters were investigated. In addition, a label free quantitative proteomics workflow was performed on kidneys. The workflow consisted of an initial global profiling of relative peptide abundances (by LC/MS, peak area quantification based on extracted ion currents), followed by identification (by MS/MS)...
August 7, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28797521/increasing-chloride-in-rivers-of-the-conterminous-u-s-and-linkages-to-potential-corrosivity-and-lead-action-level-exceedances-in-drinking-water
#18
E G Stets, C J Lee, D A Lytle, M R Schock
Corrosion in water-distribution systems is a costly problem and controlling corrosion is a primary focus of efforts to reduce lead (Pb) and copper (Cu) in tap water. High chloride concentrations can increase the tendency of water to cause corrosion in distribution systems. The effects of chloride are also expressed in several indices commonly used to describe the potential corrosivity of water, the chloride-sulfate mass ratio (CSMR) and the Larson Ratio (LR). Elevated CSMR has been linked to the galvanic corrosion of Pb whereas LR is indicative of the corrosivity of water to iron and steel...
July 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28796943/forensic-analysis-of-polychlorinated-dibenzo-p-dioxin-and-furan-fingerprints-to-elucidate-dechlorination-pathways
#19
Lisa A Rodenburg, Yashika Dewani, Max M Haggblom, Lee Kerkhof, Donna E Fennell
Polychlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) are persistent organic pollutants whose main removal process in the environment is due to biodegradation, and particularly anaerobic reductive dechlorination. Since PCDD/F congeners that are substituted in the lateral 2, 3, 7, and 8 positions are the most toxic, removal of these chlorines is advantageous, but previous studies have only demonstrated their removal under laboratory conditions. We evaluated a concentration data set of PCDD/F congeners with four or more chlorines along with all 209 polychlorinated biphenyl (PCB) congeners in surface water, treated and untreated wastewater, landfill leachate, and biosolids (NY CARP dataset) to determine whether peri and peri/lateral dechlorination of PCDD/Fs occurs in these environments...
August 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28795469/bacterial-biomes-and-potential-human-pathogens-in-irrigation-water-and-leafy-greens-from-different-production-systems-described-using-pyrosequencing
#20
M Jongman, L Chidamba, L Korsten
AIMS: To investigate the influence of irrigation water microbial quality on leafy green vegetables produced in commercial and small-scale farms as well as homestead gardens using pyrosequencing. METHODS AND RESULTS: Next generation sequencing analysis of the V1-V3 hypervariable region of bacterial 16S rDNA was used to compare bacterial diversity in irrigation water sources and on leafy vegetables. In all samples (12) analyzed, the phylum Proteobacteria (64.5%), class Gammaproteobacteria (56...
August 9, 2017: Journal of Applied Microbiology
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