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https://www.readbyqxmd.com/read/28454067/assessment-of-the-swat-model-to-simulate-a-watershed-with-limited-available-data-in-the-pampas-region-argentina
#1
Martín Romagnoli, Margarita Portapila, Alfredo Rigalli, Gisela Maydana, Martín Burgués, Carlos M García
Argentina has been among the world leaders in the production and export of agricultural products since the 1990s. The Carcarañá River Lower Basin (CRLB), a cropland of the Pampas region supplied by extensive rainfall, is located in an area with few streamgauging and other hydrologic/water-quality stations. Therefore, limited hydrologic data are available resulting in limited water-resources assessment. This work explores the application of Soil and Water Assessment Tool (SWAT) model to the CRLB in the Santa Fe province of the Pampas region...
April 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448941/geochemistry-and-microbial-diversity-of-cave-waters-in-the-gypsum-karst-aquifers-of-emilia-romagna-region-italy
#2
Ilenia M D'Angeli, Diana I Serrazanetti, Chiara Montanari, Lucia Vannini, Fausto Gardini, Jo De Waele
Fifty-seven control points of waters (sinking streams, rivers in caves, and resurgences) hosted in gypsum karst areas in Emilia Romagna region (N-Italy) were sampled in the framework of a Project LIFE+08NAT/IT/000369 "Gypsum" in the period 2010-2014. The microbiology and chemistry of these waters have been analyzed to evaluate the impact of human activities or natural factors, in the gypsum karst systems. Waters have been analyzed for major chemistry (Ca, Mg, Na, K, SO4, HCO3, Cl, NO3) and some minor constituents (F, Br, NH4 and PO4), measuring pH, electric conductivity (EC), total dissolved solids (TDS) and temperature (T) in situ...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448938/choice-modeling-of-system-wide-or-large-scale-environmental-change-in-a-developing-country-context-lessons-from-the-para%C3%A3-ba-do-sul-river
#3
James R Kahn, William F Vásquez, Carlos Eduardo de Rezende
The Rio Paraiba do Sul is a highly polluted river in south central Brazil, that is contaminated by industrial, agricultural and municipal wastes, as well as being impacted by dams, water withdrawals and deforestation in the watershed. Since only very intensive and farreaching environmental policies could result in water quality improvements, valuing the restoration of the river presents many unique challenges. We develop a choice-modeling approach to valuation of the restoration of this river, with general tightening of environmental policy as the policy, and an increase in prices as the payment vehicle...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448918/erosion-of-the-alberta-badlands-produces-highly-variable-and-elevated-heavy-metal-concentrations-in-the-red-deer-river-alberta
#4
Jason G Kerr, Colin A Cooke
Erosion is important in the transport of heavy metals from terrestrial to fluvial environments. In this study, we investigated riverine heavy metal (Cd, Cu, Hg and Pb) dynamics in the Red Deer River (RDR) watershed at sites upstream (n=2) and downstream (n=7) of the Alberta badlands, an area of naturally high erosion. At sites draining the badlands, total water column Cd, Cu, Hg and Pb concentrations frequently exceeded guidelines for the protection of freshwater biota. Furthermore, peak concentrations of total Cd (9...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448914/reconciling-agriculture-and-stream-restoration-in-europe-a-review-relating-to-the-eu-water-framework-directive
#5
REVIEW
H M Flávio, P Ferreira, N Formigo, J C Svendsen
Agriculture is widespread across the EU and has caused considerable impacts on freshwater ecosystems. To revert the degradation caused to streams and rivers, research and restoration efforts have been developed to recover ecosystem functions and services, with the European Water Framework Directive (WFD) playing a significant role in strengthening the progress. Analysing recent peer-reviewed European literature (2009-2016), this review explores 1) the conflicts and difficulties faced when restoring agriculturally impacted streams, 2) the aspects relevant to effectively reconcile agricultural land uses and healthy riverine ecosystems and 3) the effects and potential shortcomings of the first WFD management cycle...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448912/effects-of-low-levels-of-ultraviolet-radiation-on-antioxidant-mechanisms-of-japanese-medaka-oryzias-latipes
#6
Wilson F Ramírez-Duarte, Tomofumi Kurobe, Swee J Teh
Extreme weather events like drought are expected to increase with climate change, which will increase exposure of freshwater fish to ultraviolet (UV) radiation. Compared to fully grown adult fish, fish in early life stages are more susceptible to UV radiation due to the lack of well-developed pigmentation. Even though several studies have described affectation of fish health after exposure to UV radiation, most of the studies have used intensities that are only found on the surface of the earth crust or at shallow depths in water bodies, and little is known about impacts of weaker UV radiation, which can be found in deep water...
April 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448746/pharmaceutical-chemicals-steroids-and-xenoestrogens-in-water-sediments-and-fish-from-the-tidal-freshwater-potomac-river-virginia-usa
#7
Golala Arya, Sara Tadayon, James Sadighian, Jennifer Jones, Kim de Mutsert, Thomas B Huff, Gregory D Foster
Selected pharmaceutical chemicals, steroids and xenoestrogens (PCSXs) consisting of 29 endocrine modulators, therapeutic drugs, pesticides, detergents, plastics, and active ingredients in household products were measured in water, riverbed sediments and fish collected in a tributary embayment of the Potomac River (Hunting Creek, Alexandria, VA, USA) in the vicinity of wastewater discharge. A total of 17 PCSXs were found in the Hunting Creek samples, with steroid hormones (e.g., progesterone and 17α-ethinylestradiol), triclosan, dextromethorphan and bisphenol A being the most prominent micropollutants detected...
April 27, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28448613/water-temperature-dependent-degradation-of-environmental-dna-and-its-relation-to-bacterial-abundance
#8
Satsuki Tsuji, Masayuki Ushio, Sho Sakurai, Toshifumi Minamoto, Hiroki Yamanaka
Environmental DNA (eDNA) is DNA shed by organisms into surrounding environments such as soil and water. The new methods using eDNA as a marker for species detection are being rapidly developed. Here we explore basic knowledge regarding the dependence of the eDNA degradation rate on time and water temperature, and the relationship between eDNA degradation and bacterial abundance. This subject has not been well clarified, even though it is essential for improving the reliability of eDNA analysis. To determine the time- and water temperature-dependent degradation of eDNA, river water was sampled and eDNA concentrations were determined for ayu sweetfish (Plecoglossus altivelis altivelis) and common carp (Cyprinus carpio) at seven time points, over a 48-h period, and at three different water temperatures...
2017: PloS One
https://www.readbyqxmd.com/read/28448165/phytoremediation-of-organochlorine-and-pyrethroids-pesticides-by-aquatic-macrophytes-and-algae-in-freshwater-system
#9
Ghazala Riaz, Amtul Bari Tabinda, Shakir Iqbal, Abdullah Yasar, Mateen Abbas, Abdul Muqeet Khan, Yusra Mahfooz, Mujtaba Baqar
Pesticides application in agriculture and their runoff in river water is a major environmental issue. Present study evaluated the phytoremediation potential of Eichornia crassipes, Pistia strateotes and algae (chaetomorphasutoria, sirogoniumsticticum and zygnema sp.) for organochlorine and pyrethroids pesticides. Water and plant sample were extracted by liquid phase and solid phase extraction respectively and analyzed by high performance liquid chromatography (HPLC). Eleven treatments (T1-T11) with and without plant were used for phytoremediation of organochlorine and pyrethroids pesticides...
April 27, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28447172/selenium-speciation-in-the-fountain-creek-watershed-and-its-effects-on-fish-diversity
#10
James Carsella, Igor Melnykov, Sandra Bonetti, Irma Sánchez-Lombardo, Debbie C Crans
Se is an environmental concern as it can be toxic if present in high concentrations even though it is a dietary requirement for all animals. Se levels are a special concern in the Fountain Creek Watershed located in southeastern Colorado whose geological source is the Se-rich Pierre Shale. Segments of Fountain Creek have Se water levels that exceed the current EPA limit of 5 µg/l. In the studies described here, the effects of river water containing selenium were examined on fish populations at different sites along the Fountain Creek Watershed...
April 26, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28444620/environmental-pollution-with-antimicrobial-agents-from-bulk-drug-manufacturing-industries-in-hyderabad-south-india-is-associated-with-dissemination-of-extended-spectrum-beta-lactamase-and-carbapenemase-producing-pathogens
#11
Christoph Lübbert, Christian Baars, Anil Dayakar, Norman Lippmann, Arne C Rodloff, Martina Kinzig, Fritz Sörgel
PURPOSE: High antibiotic and antifungal concentrations in wastewater from anti-infective drug production may exert selection pressure for multidrug-resistant (MDR) pathogens. We investigated the environmental presence of active pharmaceutical ingredients and their association with MDR Gram-negative bacteria in Hyderabad, South India, a major production area for the global bulk drug market. METHODS: From Nov 19 to 28, 2016, water samples were collected from the direct environment of bulk drug manufacturing facilities, the vicinity of two sewage treatment plants, the Musi River, and habitats in Hyderabad and nearby villages...
April 26, 2017: Infection
https://www.readbyqxmd.com/read/28442137/enhanced-surface-ozone-during-the-heat-wave-of-2013-in-yangtze-river-delta-region-china
#12
X Pu, T J Wang, X Huang, D Melas, P Zanis, D K Papanastasiou, A Poupkou
Under the background of global warming, occurrence of heat waves has increased in most part of Europe, Asia and Australia along with enhanced ozone level. In this paper, observational air temperature and surface ozone in the Yangtze River Delta (YRD) region of China during summer of 2013, and the regional chemistry-climate model (RegCM-CHEM4) were applied to explore the relationship between heat wave and elevated ground-level ozone. Observations indicated that YRD experienced severe heat waves with maximum temperature up to 41...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28441436/environmental-dna-assays-for-the-sister-taxa-sauger-sander-canadensis-and-walleye-sander-vitreus
#13
Joseph C Dysthe, Kellie J Carim, Michael Ruggles, Kevin S McKelvey, Michael K Young, Michael K Schwartz
Sauger (Sander canadensis) and walleye (S. vitreus) are percid fishes that naturally co-occur throughout much of the eastern United States. The native range of sauger extends into the upper Missouri River drainage where walleye did not historically occur, but have been stocked as a sport fish. Sauger populations have been declining due to habitat loss, fragmentation, and competition with non-native species, such as walleye. To effectively manage sauger populations, it is necessary to identify areas where sauger occur, and particularly where they co-occur with walleye...
2017: PloS One
https://www.readbyqxmd.com/read/28440966/lead-levels-in-vegetables-from-artisanal-mining-sites-of-dilimi-river-bukuru-and-barkin-ladi-north-central-nigeria-cancer-and-non-cancer-risk-assessment
#14
Orish Ebere Orisakwe, Emmanuel Ayuba Dagur, Herbert Orji Chidi Mbagwu, Nnaemeka Arinze Udowelle
Lead (Pb) contamination of foods and especially of frequently consumed vegetables is a growing public health concern worldwide. Although levels of exposure in developed countries have declined over the past decades, the same cannot be said of developing countries. Health risk assessment has increasingly been employed to determine the potential hazard of heavy metal exposure to humans. In this study vegetable samples (tomatoes, red pepper, brown beans, lettuce, cabbage, Irish potatoes, onions, green beans and carrot), soil samples, irrigation water and sediment samples were collected from the Dilimi River, Bukuru and Barkin Ladi communities in north central Nigeria and analyzed for Pb content using atomic absorption spectroscopy...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28440628/edaphic-conditions-regulate-denitrification-directly-and-indirectly-by-altering-denitrifier-abundance-in-wetlands-along-the-han-river-china
#15
Ziqian Xiong, Laodong Guo, Quanfa Zhang, Guihua Liu, Wenzhi Liu
Riparian wetlands play a critical role in retaining nitrogen (N) from upland runoff and improving river water quality, mainly through biological processes such as soil denitrification. However, the relative contribution of abiotic and biotic factors to riparian denitrification capacity remains elusive. Here we report the spatio-temporal dynamics of potential and unamended soil denitrification rates in 20 wetlands along the Han River, an important water source in central China. We also quantified the abundance of soil denitrifying microorganisms using nirK and nirS genes...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28439264/benthic-diatom-based-indices-for-water-quality-assessment-in-two-subtropical-streams
#16
Xiang Tan, Quanfa Zhang, Michele A Burford, Fran Sheldon, Stuart E Bunn
Benthic diatoms have been universally used as indicators to assess water quality in lotic ecosystems. However, most diatom-based indices developed in Europe have not been widely used or tested in other continents such as Asia or Oceania. This study compared the performance of 14 widely-applied diatom indices in assessing ecological conditions in subtropical streams in South East Queensland (SEQ) in Australia and in the upper Han River in China. Most water quality variables in the upper Han River including dissolved organic carbon (DOC), total nitrogen (TN), and soluble reactive phosphorus (SRP) had strong relationships with at least one diatom index, with the exception of IDAP (Index Diatom Artois-Picardie), and TDI (Trophic Diatom Index)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28438916/nearly-400-million-people-are-at-higher-risk-of-schistosomiasis-because-dams-block-the-migration-of-snail-eating-river-prawns
#17
Susanne H Sokolow, Isabel J Jones, Merlijn Jocque, Diana La, Olivia Cords, Anika Knight, Andrea Lund, Chelsea L Wood, Kevin D Lafferty, Christopher M Hoover, Phillip A Collender, Justin V Remais, David Lopez-Carr, Jonathan Fisk, Armand M Kuris, Giulio A De Leo
Dams have long been associated with elevated burdens of human schistosomiasis, but how dams increase disease is not always clear, in part because dams have many ecological and socio-economic effects. A recent hypothesis argues that dams block reproduction of the migratory river prawns that eat the snail hosts of schistosomiasis. In the Senegal River Basin, there is evidence that prawn populations declined and schistosomiasis increased after completion of the Diama Dam. Restoring prawns to a water-access site upstream of the dam reduced snail density and reinfection rates in people...
June 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28438356/rainfall-increases-the-abundance-of-antibiotic-resistance-genes-within-a-riverine-microbial-community
#18
Andrea Di Cesare, Ester M Eckert, Michela Rogora, Gianluca Corno
Infections with antibiotic resistant bacteria are among the major threats for human health. Studies elucidating the role of the environment in their spread are still in their infancy, it, however, seems that different environments might function as a long-term reservoir of antibiotic resistance genes (ARGs) that reside within their microbial communities. An increasing number of studies target the presence and the persistence of ARGs in waters and soils that are exposed to human activities; they, however, rarely consider the spatial/temporal variability that predominate in these environments...
April 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#19
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437896/variability-of-apparent-and-inherent-optical-properties-of-sediment-laden-waters-in-large-river-basins-lessons-from-in-situ-measurements-and-bio-optical-modeling
#20
Sylvain Pinet, Jean-Michel Martinez, Sylvain Ouillon, Bruno Lartiges, Raul Espinoza Villar
We investigated the relationships between inherent and apparent optical properties (IOP and AOP, respectively) and suspended sediment concentrations (SSC) in the main Amazonian river waters. In situ measurements of SSC, remote sensing reflectance (R<sub>rs</sub>), the diffuse light attenuation coefficient (K<sub>d</sub>) and the total and non-algal particle (NAP) absorption coefficients (a<sub>TOT</sub> and a<sub>NAP</sub>, respectively) were conducted during three sampling trips along different streams of the Amazon River catchment (104 stations)...
April 17, 2017: Optics Express
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