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https://www.readbyqxmd.com/read/28202282/trends-in-nitrogen-isotope-ratios-of-juvenile-winter-flounder-reflect-changing-nitrogen-inputs-to-rhode-island-usa-estuarine-systems
#1
Richard J Pruell, Bryan K Taplin, Kenneth M Miller
Nitrogen isotope ratios (δ(15)N) in juvenile winter flounder, Pseudopleuronectes americanus, were used to examine changes in nitrogen inputs to several Rhode Island, USA estuarine systems. Fish were collected over two three-year periods with a ten-year interval between sampling periods (2002-2004 and 2012-2014). During that interval numerous changes to nutrient management practices were initiated in the watersheds of these estuarine systems including the upgrade of several major wastewater treatment facilities that discharge to Narragansett Bay, which significantly reduced nitrogen inputs...
February 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28187346/hydrologic-land-cover-and-seasonal-patterns-of-waterborne-pathogens-in-great-lakes-tributaries
#2
P L Lenaker, S R Corsi, M A Borchardt, S K Spencer, A K Baldwin, M A Lutz
Great Lakes tributaries are known to deliver waterborne pathogens from a host of sources. To examine the hydrologic, land cover, and seasonal patterns of waterborne pathogens (i.e. protozoa (2), pathogenic bacteria (4) human viruses, (8) and bovine viruses (8)) eight rivers were monitored in the Great Lakes Basin over 29 months from February 2011 to June 2013. Sampling locations represented a wide variety of land cover classes from urban to agriculture to forest. A custom automated pathogen sampler was deployed at eight sampling locations which provided unattended, flow-weighted, large-volume (120-1630 L) sampling...
February 7, 2017: Water Research
https://www.readbyqxmd.com/read/28177420/small-reservoirs-as-a-beneficial-management-practice-for-nitrogen-removal
#3
Raea M Gooding, Helen M Baulch
There are few beneficial management practices (BMPs) with demonstrated efficacy in snowmelt-dominated regions. Small reservoirs are a BMP that can help mitigate flooding and reduce sediment transport, while reducing export of dissolved nutrients. To understand controls on nitrate removal and assess how this ecosystem service can be optimized, denitrification activity was measured in reservoirs and stream pools of the Tobacco Creek Model Watershed (Manitoba, Canada) via the chloramphenicol-amended acetylene block technique...
January 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28177419/modeling-patterns-of-total-dissolved-solids-release-from-central-appalachia-usa-mine-spoils
#4
Elyse V Clark, Carl E Zipper, W Lee Daniels, Zenah W Orndorff, Matthew J Keefe
Surface mining in the central Appalachian coalfields (USA) influences water quality because the interaction of infiltrated waters and O with freshly exposed mine spoils releases elevated levels of total dissolved solids (TDS) to streams. Modeling and predicting the short- and long-term TDS release potentials of mine spoils can aid in the management of current and future mining-influenced watersheds and landscapes. In this study, the specific conductance (SC, a proxy variable for TDS) patterns of 39 mine spoils during a sequence of 40 leaching events were modeled using a five-parameter nonlinear regression...
January 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28177409/increased-soluble-phosphorus-loads-to-lake-erie-unintended-consequences-of-conservation-practices
#5
Helen P Jarvie, Laura T Johnson, Andrew N Sharpley, Douglas R Smith, David B Baker, Tom W Bruulsema, Remegio Confesor
Cumulative daily load time series show that the early 2000s marked a step-change increase in riverine soluble reactive phosphorus (SRP) loads entering the Western Lake Erie Basin from three major tributaries: the Maumee, Sandusky, and Raisin Rivers. These elevated SRP loads have been sustained over the last 12 yr. Empirical regression models were used to estimate the contributions from (i) increased runoff from changing weather and precipitation patterns and (ii) increased SRP delivery (the combined effects of increased source availability and/or increased transport efficiency of labile phosphorus [P] fractions)...
January 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28177403/release-from-streambed-to-water-column-during-baseflow-periods-a-modeling-study
#6
Yongeun Park, Yakov Pachepsky, Eun-Mi Hong, Daniel Shelton, Cary Coppock
Streambed sediments can harbor large populations that are released into the water column during high-flow events. Few studies have been conducted on the rates of transfer from streambed sediment to water column in low-flow conditions in natural streams. The aim of this work was to apply the watershed-scale model SWAT (Soil and Water Assessment Tool) to a natural stream to evaluate the need to account for the release from streambed sediments during baseflow periods and to compare the results of simulating such a release by assuming predominantly passive transport, driven by groundwater influx, against simulations assuming predominantly active transport of random or chemotaxis-driven bacteria movement...
January 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28161316/modeling-watershed-scale-137-cs-transport-in-a-forested-catchment-affected-by-the-fukushima-dai-ichi-nuclear-power-plant-accident
#7
Lezhang Wei, Tsuyoshi Kinouchi, Kazuya Yoshimura, Mark L Velleux
The Fukushima nuclear accident in 2011 resulted in (137)Cs contamination of large areas in northeast Japan. A watershed-scale (137)Cs transport model was developed and applied to a forested catchment in Fukushima area. This model considers (137)Cs wash-off from vegetation, movement through soils, and transport of dissolved and particulate (137)Cs adsorbed to clay, silt and sand. Comparisons between measurements and simulations demonstrated that the model well reproduced (137)Cs concentrations in the stream fed from the catchment...
February 2, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28160646/evaluating-the-significance-of-wetland-restoration-scenarios-on-phosphorus-removal
#8
Fariborz Daneshvar, A Pouyan Nejadhashemi, Umesh Adhikari, Behin Elahi, Mohammad Abouali, Matthew R Herman, Edwin Martinez-Martinez, Timothy J Calappi, Bridget G Rohn
Freshwater resources are vital for human and natural systems. However, anthropogenic activities, such as agricultural practices, have led to the degradation of the quality of these limited resources through pollutant loading. Agricultural Best Management Practices (BMPs), such as wetlands, are recommended as a valuable solution for pollutant removal. However, evaluation of their long-term impacts is difficult and requires modeling since performing in-situ monitoring is expensive and not feasible at the watershed scale...
February 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28135587/spatially-explicit-methodology-for-coordinated-manure-management-in-shared-watersheds
#9
Mahmoud Sharara, Apoorva Sampat, Laura W Good, Amanda S Smith, Pamela Porter, Victor M Zavala, Rebecca Larson, Troy Runge
Increased clustering and consolidation of livestock production systems has been linked to adverse impacts on water quality. This study presents a methodology to optimize manure management within a hydrologic region to minimize agricultural phosphorus (P) loss associated with winter manure application. Spatial and non-spatial data representing livestock, crop, soil, terrain and hydrography were compiled to determine manure P production rates, crop P uptake, existing manure storage capabilities, and transportation distances...
January 27, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28119006/assessing-anthropogenic-impacts-on-riverine-ecosystems-using-nested-partial-least-squares-regression
#10
A R L Ferreira, L F Sanches Fernandes, R M V Cortes, F A L Pacheco
The results of three Partial Least Squares (PLS) regression models were used to gain a holistic view on the consequences of natural processes and anthropogenic pressures for water quality degradation and biodiversity decline in a multi-use watershed. The processes were soil erosion and wildfire risk; the pressures comprised land use conflicts, leachates from domestic and industrial waste, arable farming intensity and livestock density. Water quality was characterized for concentrations of nutrients (nitrate, phosphate), oxygen demands (Biochemical Oxygen Demand - BOD5, Chemical Oxygen Demand - COD) and various metals (e...
January 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28116603/soil-land-use-time-and-sustainable-intensification-of-agriculture-in-the-brazilian-cerrado-region
#11
Kleber Trabaquini, Lênio Soares Galvão, Antonio Roberto Formaggio, Luiz Eduardo Oliveira E Cruz de Aragão
The Brazilian Cerrado area is in rapid decline because of the expansion of modern agriculture. In this study, we used extensive field data and a 30-year chronosequence of Landsat images (1980-2010) to assess the effects of time since conversion of Cerrado into agriculture upon soil chemical attributes and soybean/corn yield in the Alto do Rio Verde watershed. We determined the rates of vegetation conversion into agriculture, the agricultural land use time since conversion, and the temporal changes in topsoil (0-20 cm soil depth) and subsurface (20-40 cm) chemical attributes of the soils...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28104330/evaluation-of-individual-and-combined-management-practices-to-reduce-the-off-site-transport-of-pesticides-from-golf-course-turf
#12
Pamela J Rice, Brian P Horgan, Jennifer L Hamlin
The detection of pesticides, associated with turfgrass management, in storm runoff and surface waters of urban watersheds has raised concerns regarding their source, potential environmental effects and a need for strategies to reduce their inputs. In previous research we discovered that hollow tine core cultivation (HTCC) was more effective than other management practices for reducing the off-site transport of pesticides with runoff from creeping bentgrass turf managed as a golf course fairway. This was primarily the result of enhanced infiltration and reduced runoff volumes associated with turf managed with hollow tines...
January 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28092769/spatiotemporal-change-of-phosphorous-speciation-and-concentration-in-stormwater-in-the-st-lucie-estuary-watershed-south-florida
#13
Liguang Li, Zhenli He, Zhigang Li, Suli Li, Yongshan Wan, Peter J Stoffella
Phosphorous (P) concentration in stormwater runoff varies at different spatial and temporal scales. Excessive P loading from agriculture system into the St. Lucie Estuary (SLE) contributed to water quality deterioration in southern Indian River Lagoon. This study examines the spatial and temporal shifts of different P forms in runoff and storm water under different land use, water management, and rainfall conditions. Storm water samplings were conducted monthly between April 2013 and December 2014 in typical farmland and along the waterway (Canal C-24) that connects lands to the SLE...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28087074/quantifying-loading-toxic-concentrations-and-systemic-persistence-of-chloride-in-a-contemporary-mixed-land-use-watershed-using-an-experimental-watershed-approach
#14
J A Hubbart, E Kellner, L W Hooper, S Zeiger
A nested-scale experimental watershed study was implemented to quantify loading and persistence of chloride in an urbanizing, mixed-land-use watershed. A Midwest USA (Missouri) watershed was partitioned into five sub-basins with contrasting dominant land use. Streamwater was tested for chloride concentration four days per week from October 2009 through May 2014 at each site. Monitoring sites included co-located gauging and climate stations recording variables at 30-minute intervals. Results indicate significant (p<0...
January 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28078369/effectiveness-of-integrated-best-management-practices-on-mitigation-of-atrazine-and-metolachlor-in-an-agricultural-lake-watershed
#15
Richard Lizotte, Martin Locke, Ronald Bingner, R Wade Steinriede, Sammie Smith
The study examined the influence of land-use (cropping patterns) and integrated agricultural best management practices (BMPs) on spring herbicide levels in an agricultural watershed. Atrazine and metolachlor were applied for weed control during spring of 1998-2002, 2005, and 2007-2013. Watershed-wide mass of applied herbicides ranged from 12.7 to 209.2 g atrazine and 10.9-302.2 g metolachlor with greatest application during 1998, 2009-2010 (atrazine) and 2007-2013 (metolachlor). Spring herbicide concentrations in Beasley Lake water ranged from below detection to 3...
January 11, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28073478/mitigating-cyanobacterial-harmful-algal-blooms-in-aquatic-ecosystems-impacted-by-climate-change-and-anthropogenic-nutrients
#16
REVIEW
Hans W Paerl, Wayne S Gardner, Karl E Havens, Alan R Joyner, Mark J McCarthy, Silvia E Newell, Boqiang Qin, J Thad Scott
Mitigating the global expansion of cyanobacterial harmful blooms (CyanoHABs) is a major challenge facing researchers and resource managers. A variety of traditional (e.g., nutrient load reduction) and experimental (e.g., artificial mixing and flushing, omnivorous fish removal) approaches have been used to reduce bloom occurrences. Managers now face the additional effects of climate change on watershed hydrologic and nutrient loading dynamics, lake and estuary temperature, mixing regime, internal nutrient dynamics, and other factors...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28065545/geochemical-isotopic-composition-in-the-loess-plateau-and-corresponding-source-analyses-a-case-study-of-china-s-yangjuangou-catchment
#17
Yafeng Wang, Liding Chen, Yang Gao, Shibo Chen, Weiliang Chen, Zhuo Hao, Junjie Jia, Ning Han
Isotopic fractionation technology is widely used in identifying sources and the speciation of geochemical isotopic elements. With the increase in human activity, geochemical element transport by soil erosion has become the most critical environmental problem in the Loess Plateau, so tracing the geochemical element source would help in the identification and management of local soil erosion. In this study, we investigated the spatial distribution of carbon (C), nitrogen (N), oxygen (O), and hydrogen (H) isotopes in water and then further analyzed (13)C and (15)N in soil and vegetation to better understand the C and N sources and their biogeochemical cycling function in the Loess Plateau...
January 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28052389/infectious-hematopoietic-necrosis-virus-virological-and-genetic-surveillance-2000-2012
#18
Rachel Breyta, Ilana Brito, Gael Kurath, Shannon LaDeau
Surveillance records of the acute RNA pathogen of Pacific salmonid fish infectious hematopoietic necrosis virus are combined for the first time to enable landscape-level ecological analyses and modeling. The study area is the freshwater ecosystems of the large Columbia River watershed in the U.S. states of Washington, Oregon, and Idaho, as well as coastal rivers in Washington and Oregon. The study period is 2000-2012, and records were contributed by all five resource management agencies that operate conservation hatcheries in the study area...
January 2017: Ecology
https://www.readbyqxmd.com/read/28043701/unconventional-oil-and-gas-spills-materials-volumes-and-risks-to-surface-waters-in-four-states-of-the-u-s
#19
Kelly O Maloney, Sharon Baruch-Mordo, Lauren A Patterson, Jean-Philippe Nicot, Sally A Entrekin, Joseph E Fargione, Joseph M Kiesecker, Kate E Konschnik, Joseph N Ryan, Anne M Trainor, James E Saiers, Hannah J Wiseman
Extraction of oil and gas from unconventional sources, such as shale, has dramatically increased over the past ten years, raising the potential for spills or releases of chemicals, waste materials, and oil and gas. We analyzed spill data associated with unconventional wells from Colorado, New Mexico, North Dakota and Pennsylvania from 2005 to 2014, where we defined unconventional wells as horizontally drilled into an unconventional formation. We identified materials spilled by state and for each material we summarized frequency, volumes and spill rates...
December 30, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28040221/spatial-patterns-and-origins-of-heavy-metals-in-sheyang-river-catchment-in-jiangsu-china-based-on-geographically-weighted-regression
#20
Shan-Shan Wu, Hao Yang, Fei Guo, Rui-Ming Han
Multivariate statistical analyses combined with geographically weighted regression (GWR) were used to identify spatial variations of heavy metals in sediments and to examine relationships between metal pollution and land use practices in watersheds, including urban land, agriculture land, forest and water bodies. Seven metals (Cu, Zn, Pb, Cr, Ni, Mn and Fe) of sediments were measured at 31 sampling sites in Sheyang River. Most metals were under a certain degree enrichment based on the enrichment factors. Cluster analysis grouped all sites into four statistically significant cluster, severely contaminated areas were concentrated in areas with intensive human activities...
December 28, 2016: Science of the Total Environment
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