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Records 1 to 25 of 1697 records about 'Ecosystems and Watersheds'

Climate Impacts on Watersheds, Water Quality, and Ecosystems Project (CIVA-2), Summary Report: FY16 – FY2019 (October 1, 2015 – September 30, 2019)
(SUMMARY) [Published : Sep 30, 2019]
Climate change poses unique challenges for protecting environmental resources upon which our society depends. Adapting to changing climate hinges on knowing the regional and local vulnerabilities and impacts to water resources and ecosystem services. Determining social and ecolo...
Building Capacity for Collaborative Decisions, Resilient Ecosystems, and Sustainable Practices: Water, Land, Communtiy and People in Estuarine Watersheds
(PRESENTATION) [Presented : Jul 19, 2009]
Population growth, urban expansion, and the warming climate have and will continue to stress our coastal ecosystems. Decisions on how and when to respond with stewardship, adaptation, and mitigation are made by individuals, municipalities, states, and agencies. These decisions ...
CHARACTERIZE INTERACTIONS BETWEEN ECOSYSTEM FUNCTIONING AND CHANGES IN CLIMATE, UV, AND LAND USE
[Published : Sep 30, 2004]
Assessments of the long-term impacts of global changes in climate, ultraviolet (UV) radiation and land use on ecosystems require scientific data, concepts and models that describe the responses of ecosystem health to stresses related to the changes as well as information and mode...
EFFECTS OF LAND USE CHANGES ON THE FUNCTIONING OF SOILS AND WATERSHEDS OF CENTRAL BRAZIL SAVANNAS: PHASE 2, IMPACTS ON NUTRIENT AND CARBON CYCLES AND TRACE GAS EXCHANGE
[Published : Sep 30, 2004]
This research is funded through an interagency agreement with NASA. The research in this project is contributing to assessments of the effects of land use in central Brazil on: 1) the stocks and cycling rates of carbon and nutrient cycling; 2) the function and structure of soil ...
ECOLOGICAL FORECASTING FOR WATERSHEDS
[Published : Sep 30, 2002]
To effectively manage watersheds, the assessment of watershed ecological response to physicochemical stressors such as nutrients, sediments, pathogens, and toxics over broad spatial and temporal scales is needed. Assessments at this level of complexity requires the development of...
ECOLOGICAL SUSTAINABILITY IN RAPIDLY URBANIZING WATERSHEDS: EVALUATING STRATEGIES DESIGNED TO MITIGATE IMPACTS ON STREAM ECOSYSTEMS
[Published : Apr 30, 2008]
<p>Urbanization has profound impacts on the hydrology and ecology of streams via alteration in water temperatures, peak and base flows, and nutrient, sediment, and contaminant inputs. Storm water management (SWM) is commonly used to reduce these impacts; however, comprehensive w...
EFFECTS OF SUCCESSION ON NITROGEN EXPORT IN THE WEST-CENTRAL CASCADES, OREGON
(JOURNAL) [Published : Aug 01, 2005]
Conceptual models predict that unpolluted, aggrading forest ecosystems tightly retain available nitrogen (N) until declining productivity by mature trees and storage in detritus reduces the demand for essential nutrients, and N export increases to equal input. Short-term nitrate ...
MINEBANK RUN PROJECT AS AN APPROACH FOR RESTORING DEGRADED URBAN WATERSHEDS AND RIPARIAN ECOSYSTEMS
(PRESENTATION) [Presented : May 16, 2005]
Elevated nitrate levels in streams and groundwater pose human and ecological threats. Minebank Run, an urban stream in Baltimore MD, will be restored in 2004/2005 using various techniques including reshaping stream banks to reconnect stream channel to flood plain, stream bank r...
SUSTAINABLE SOLUTIONS FOR RESTORING DEGRADED WATERSHEDS AND RIPARIAN ECOSYSTEMS: IMPLEMENTATION, EVALUATION, AND AMELIORATION
(PRESENTATION) [Presented : May 16, 2005]
The objective of the Office of Research and Development (ORD) ecosystem restoration research strategy is to evaluate the effectiveness of restoration and management practices for achieving desired environmental conditions that protect and enhance ecosystem services for society. T...
DIAGNOSTIC TOOL DEVELOPMENT AND APPLICATION THROUGH REGIONAL CASE STUDIES
[Published : May 01, 2006]
Case studies are a useful vehicle for developing and testing conceptual models, classification systems, diagnostic tools and models, and stressor-response relationships. Furthermore, case studies focused on specific places or issues of interest to the Agency provide an excellent ...
ECOSYSTEM PROCESSES AND WATERSHED STRESSORS
[Published : Oct 01, 2002]
The objective of the proposed study is to assess the responsiveness of indicators of ecosystem function to three intensities of watershed disturbance in four regions. An integrated assessment of abiotic and biotic condition of streams will be conducted to assess streams affected...
MERCURY FATE AND EXPOSURE IN WATERSHEDS
[Published : Sep 30, 2004]
Mercury is released from a variety of sources and exhibits a complicated chemistry. The primary exposure pathway for humans and wildlife is the consumption of contaminated fish. The goal of this research is to provide the scientific information needed for EPA to assess and manag...
METABOLIC RESPONSES OF AQUATIC ECOSYSTEMS TO CLIMATE WARMING
[Published : Aug 31, 2015]
<p>There is increasing evidence that stream metabolic processes that increase CO2 flux to the atmosphere will be highly sensitive to rising temperatures, changing precipitation patterns and shifts in carbon loading from watersheds. In addition, preliminary data suggest that th...
Across Hydrological Interfaces from Coastal Watersheds to the Open Lake: Finding Landscape Signals in the Great Lakes Coastal Zone
(PRESENTATION) [Presented : Dec 06, 2011]
Over the past decade, our group has been working to bring coastal ecosystems into integrated basin-lakewide monitoring and assessment strategies for the Great Lakes. We have conducted a wide range of research on coastal tributaries, coastal wetlands, semi-enclosed embayments an...
ERD WATERSHED AND WATER QUALITY MODEL DEVELOPMENT AND TECHNICAL SUPPORT PROGRAM
[Published : Jul 21, 2004]
The ERD has a long history in providing model research and development and technical support to Regions, States and the Office of Water for watersheds/water quality ecosystem research. The ERD efforts are described in major subtasks comprising the Program. Briefly, these are:<b...
MODELING MINERAL NITROGEN EXPORT FROM A FOREST TERRESTRIAL ECOSYSTEM TO STREAMS
(JOURNAL) [Published : Jul 01, 2004]
Terrestrial ecosystems are major sources of N pollution to aquatic ecosystems. Predicting N export to streams is a critical goal of non-point source modeling. This study was conducted to assess the effect of terrestrial N cycling on stream N export using long-term monitoring da...
ASSESSING EFFECTS OF ALTERNATIVE AGRICULTURAL PRACTICES ON WILDLIFE HABITAT IN IOWA, USA
(JOURNAL) [Published : Feb 01, 2006]
A habitat-change model was used to compare past, present, and future land cover and management practices to assess potential impacts of alternative agricultural practices on wildlife in two agricultural watersheds, Walnut Creek and Buck Creek, in central Iowa, USA. This approach ...
DEVELOPMENT OF LANDSCAPE INDICATORS FOR USE IN REGIONAL ECOLOGICAL RISK ASSESSMENTS
[Published : Apr 21, 2010]
There is a growing need for cost effective ways to assess conditions of and risks to ecological resources at a variety of scales over broad regions. Indicators, models and assessment tools are needed to evaluate water bodies at risk to non-point source pollution and to be able t...
ENVIRONMENTAL MONITORING AND ASSESSMENT PROGRAM (EMAP): NATIONAL COASTAL ASSESSMENT, GULF OF MEXICO, AND INDICATOR DEVELOPMENT
[Published : Nov 10, 2003]
The estuaries and coastal waters of the U.S. represent a complex set of ecosystems along the coasts of the Atlantic Ocean, Gulf of Mexico and Pacific Ocean. These ecosystems are affected by effluents and nutrients entering the coastal waters, as well as global stressors and anthr...
FIELD RESEARCH PROGRAM
[Published : Sep 30, 2004]
Recent trends in current and evolving environmental regulatory strategies dictate that EPA will have to rely more heavily on predictive modeling technologies in carrying-out the increasingly complex array of exposure and risk assessments necessary to develop scientifically defens...
HOW FAR TO THE NEAREST ROAD?
(JOURNAL) [Published : Oct 27, 2003]
Ecological impacts from roads may be the rule rather than the exception in most watersheds of the conterminous United States. We measured total area, and forestland area located within nine distances of the nearest road of any type in each of 2,108 watersheds nationwide. Overall,...
Healthy Watersheds Integrated Assessments Workshop Synthesis
(PUBLISHED REPORT) [Published : Feb 24, 2012]
The U.S. Environmental Protection Agency, in partnership with others, is embarking on the new Healthy Watersheds Initiative to protect our remaining healthy watersheds, prevent them from becoming impaired, and accelerate our restoration successes. In November 2010, a Healthy Wate...
INVASION DYNAMICS OF RED SHINER (CYPRINELLA LUTRENSIS) ACROSS SOUTHEASTERN U.S. WATERSHEDS
[Published : Apr 14, 2004]
Biological invasions are one of the foremost threats to the integrity of aquatic ecosystems in the U.S., but little is known regarding the invasion dynamics of non-indigenous fishes in streams. Southeastern streams, renowned for their exceptional levels of fish endemism and dive...
LANDSCAPE INDICATORS FOR STREAM VULNERABILITY TO PESTICIDES AND TOXIC SUBSTANCES
[Published : Feb 21, 2002]
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...
NITROUS OXIDE CONCENTRATIONS IN SMALL STREAMS OF THE GEORGIA PIEDMONT
(PRESENTATION) [Presented : Nov 10, 2002]
We are measuring the dissolved nitrous oxide concentration in 17 headwater streams in the South Fork Broad River, Georgia watershed on a monthly basis. The selected small streams drain watersheds dominated by forest, pasture, developed, or mixed land uses. Nitrous oxide concentr...