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  • Keyword = Nutrients.
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Records 1 to 25 of 2362

Characterization Of Nutrients And Fecal Indicator Bacteria At A Concentrated Swine Feeding Operation In Wake County, North Carolina, 2009-2011 (PUBLISHED REPORT)
Hydrologic and water-quality data were collected during October 2009 - January 2011 to characterize nutrient and bacteria concentrations in stormwater runoff from agricultural fields that receive wastewater originating at a swine facility at North CarolinaState University's Lake ...
How do nutrients affect Aedes aegypti and Zika infection in neighborhoods in San Juan, Puerto Rico? (PRESENTATION)
Inputs of detritus have been shown to be strong drivers of container mosquito production and life history traits, including for species that are of medical importance. During 2016, Zika infection swelled throughout the Caribbean and South and Central America, a disease vectored p...
LANDSCAPE INDICATORS FOR STREAM VULNERABILITY TO PESTICIDES AND TOXIC SUBSTANCES ()
Evaluating environmental conditions at community, watershed, regional, and national scales is a growing interest among Federal agencies, states, and the public. At the same time, the relatively high cost of collecting environmental data has limited the implementation of regional...
LINKING GREAT WATERSHEDS AND RIVERS TO FORECAST THE IMPACT OF NUTRIENTS ON LARGE RECEIVING WATERS (PRESENTATION)
Assessment of our nation's waters, as per sections 305(b) and 303(d) of the Clean Water Act, indicates that approximately 40% are impacted by chemical and non-chemical stressors that impair designated beneficial uses and ecological habitat. Excess nutrients are often listed as a ...
Summary of Briefing to the GLWQA Annex 4 Nutrients Subcommittee (Ann Arbor, Michigan, October 29, 2014) and Progress in Improving Data Representation. Lake Erie Objectives and Targets Task Team, Annex 4 Nutrients, Great Lakes Water Quality Agreement (PRESENTATION)
There is high potential that the body of work and data being conducted and used by this workgroup will become guidance under the Great Lakes Water Quality Agreement
PREDICTING PRESENCE OF NUTRIENTS AND PESTICIDES IN BASE FLOW CONDITIONS OF FIRST ORDER STREAMS IN THE MID-ATLANTIC COASTAL PLAIN (PRESENTATION)
Excess nutrients and pesticides in the environment can cause a variety of ecological and human-health effects. When nutrients are unused by plants, or pesticides remain after use on their intended target, these compounds can be transported to streams, either directly through over...
RESPONSE OF NUTRIENTS, BIOFILM, AND BENTHIC INSECTS TO SALMON CARCASS ADDITION (JOURNAL)
Salmon carcass addition to streams is expected to increase stream productivity at multiple trophic levels. This study examined stream nutrient (nitrogen, phosphorus, and carbon), epilithic biofilm (ash-free dry mass and chlorophyll a), leaf-litter decomposition, and macroinverte...
Can Biochar Covers Reduce Emissions from Manure Lagoons While Capturing Nutrients? (JOURNAL)
The unique physical and chemical properties of biochars make them promising materials for odor, gas, and nutrient sorption. Floating covers made from organic materials (biocovers) are one option for reducing odor and gas emissions from livestock manure lagoons. This study evaluat...
NAWQA RETROSPECTIVE DATABASE FOR NUTRIENTS IN GROUND WATER AND SURFACE WATER ()
The National Water-Quality Assessment (NAWQA) Program is designed to describe the status and trends in the quality of the Nations ground- and surface-water resources and to provide a sound understanding of the natural and human factors that affect the quality of these resources. ...
SOURCES AND TRANSPORT OF NUTRIENTS IN COASTAL PLAIN WATERSHEDS AND THE EFFECTS OF THESE NUTRIENTS ON ESTUARINE ECOSYSTEMS (PRESENTATION)
Poster for the EPA Science Forum.<br><br>This collaborative research effort assessed how changing coastal plain watershed land-uses influence the delivery of nutrients and sediments to estuaries and subsequently how estauries respond to increasing loads of pollutants. <br><br>
SPARROWs, Lakes, and Nutrients? (NEWSLETTER ARTICLE)
This is a blog post for EPA's public Blog, It All Starts with Science.
ADDING NUTRIENTS TO ENHANCE SALMON RUNS: DEVELOPING A COHERENT PUBLIC POLICY (JOURNAL)
One scheme to help restore salmon to the Pacific Northwest is the addition of nutrients (i.e., raw or processed salmon carcasses, and commercially produced organic or inorganic fertilizers) to headwaters (i.e., watersheds, lakes, or streams) that are now nutrient deficient becau...
ANALYSIS OF PARTICULATE BOUND NUTRIENTS IN URBAN STORMWATER (PRESENTATION)
Nutrients are important players in the degradation of waterbodies because they are often the elements that limit primary productivity and, hence, are the key factors controlling eutrophication. Eutrophication causes unsightly algal blooms leading to oxygen depletion, stress on o...
Anthropogenic Enrichment and Nutrients in Some Tropical Lagoons of Ghana, West Africa (JOURNAL)
As part of a larger study of demographic change in coastal Ghana, we measured the concentrations of major plant nutrients and phytoplankton chlorophyll in eight coastal lagoons with different land use and human population density. The purpose of our study was to relate human acti...
CHARACTERIZATION AND PREDICTION OF NUTRIENTS AND PESTICIDES IN BASE FLOW CONDITIONS OF FIRST ORDER STREAMS IN THE MID-ATLANTIC COASTAL PLAIN-A COLLABORATIVE EFFORT (PRESENTATION)
The Landscape Indicators for Pesticides Study in Mid-Atlantic Coastal Streams (LIPS-MACS) is a collaborative research effort between the U.S. Environmental Protection Agency's Office of Research and Development and the U.S. Geological Survey's National Water Quality Assessment Pr...
Environmental Trade-Offs of Stream Restoration for Managing Stormwater and Nutrients in Urban Ecosystems (PRESENTATION)
Hydrologic modifications in urban ecosystems impact water quality via soil compaction, impervious surface cover, drainage, and channelization. Urban stream restoration strategies that are designed to regain lost ecosystem function such as nutrient uptake may have unintended cons...
INFLUENCE OF TIDE AND WAVES ON WASHOUT OF DISSOLVED NUTRIENTS FROM THE BIOREMEDIATION ZONE OF A COARSE-SAND BEACH: APPLICATION IN OIL-SPILL BIOREMEDIATION (JOURNAL)
Successful bioremediation of oil-contaminated beaches requires maintenance of a sufficient quantity of growth-limiting nutrients in contact with the oiled beach materials. A conservative tracer study was conducted on a moderate-energy, sandy beach on Delaware Bay to estimate the...
Siletz River nutrients: Effects of biosolids application (PRESENTATION)
Stream water nutrients were measured in the Siletz River, Oregon, with the goal of comparing dissolved nutrient concentrations, primarily the nitrogenous nutrients nitrate and ammonium, with previously collected data for the Yaquina and Alsea Rivers for the nutrient criteria prog...
Classification of Regional Patterns of Environmental Drivers and Benthic Habitats in Pacific Northwest Estuaries (PUBLISHED REPORT)
While increased anthropogenic nutrient loading of coastal ecosystems is a growing ecological and economic problem both in the U.S. and globally, the extent of such excess nutrient loading in Pacific Northwest estuaries is poorly known. To help determine the vulnerability of Pacif...
Effects of sulfate deposition on pore water dissolved organic carbon, nutrients, and microbial enzyme activities in a northern peatland (JOURNAL)
Export of dissolved organic carbon from lakes and streams has increased throughout Europe and North America over the past several decades. One possible cause is altered deposition chemistry; specifically, decreasing sulfate inputs leading to changes in ionic strength and dissolve...
IMPACTS OF IRON, NUTRIENTS, AND MINERAL FINES ON ANAEROBIC BIODEGRADATION OF CANOLA OIL IN FRESHWATER SEDIMENTS (JOURNAL)
Factors affecting anaerobic biodegradation kinetics of canola oil in freshwater sediments were investigated. An optimum dose of ferric hydroxide (10.5 g Fe(III)·kg<SUP>-1</SUP> sediment) was found to stimulate anaerobic biodegradation of canola oil (18.6 g oil kg<SUP>-1</SUP>). ...
Nutrients and EPA’s Ecosystem Services Research Program (PRESENTATION)
Abstract for presentation at Gulf of Mexico Alliance Implementation Workshop August, 2010
Nutrients and the Great Lakes Nearshore, Circa 2002-2007 (PAPER IN NON-EPA PROCEEDINGS)
Nearshore nutrient impressions were largely limited to observations of local spatial trends from a few site-specific studies and some temporal trends at a set of Canadian water intake locations (later summarized in Nicholls et al. 1999). Lacking a systematic information base fo...
SELECTION OF NUTRIENTS TO ENHANCE BIODEGRADATION FOR THE REMEDIATION OF OIL SPILLED ON BEACHES ()
Laboratory studies were conducted to determine the fate of fertilizers proposed for application to the Alaska shoreline in support of the Alaskan Oil Spill EPA Bioremediation Project. ertilizer application is theorized to prove indigenous organisms with nutrients that appear to b...
DEVELOPMENT AND EVALUATION OF APPLICATION TECHNIQUES FOR DELIVERY OF NUTRIENTS TO CONTAMINATED SHORELINE IN PRINCE WILLIAM SOUND ()
The application of nutrients to assist and accelerate naturally occurring biodegradation processes was studied at field scale on contaminated shoreline in Prince William Sound as part of the effort to recover from the Exxon Valdez oil spill. election of fertilizer forms and means...