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Records 1 to 25 of 1692 records about 'Aquatic Ecosystems'

Aquatic Ecosystems, Water Quality, and Global Change: Challenges of conducting Multi-Stressor Vulnerability Assessments (External Review Draft)
(PUBLISHED REPORT) [Published : Feb 22, 2011]
This draft report investigates the issues and challenges associated with identifying, calculating, and mapping indicators of the relative vulnerability of water quality and aquatic ecosystems, across the United States, to the potential impacts of global change. Using a large set...
The Effects Of Mountaintop Mines And Valley Fills On Aquatic Ecosystems Of The Central Appalachian Coalfields (2011 Final)
(PUBLISHED REPORT) [Published : May 27, 2011]
EPA announced the availability of the final report, <em>The Effects of Mountaintop Mines and Valley Fills on Aquatic Ecosystems of the Central Appalachian Coalfields</em>. This report assesses the state of the science on the environmental impacts of mountaintop mines and valley ...
CONCEPTUAL MODELS AND METHODS TO GUIDE DIAGNOSTIC RESEARCH INTO CAUSES OF IMPAIRMENT TO AQUATIC ECOSYSTEMS
(PUBLISHED REPORT) [Published : Mar 01, 2006]
Methods and conceptual models to guide the development of tools for diagnosing the causes of biological impairment within aquatic ecosystems of the United States are described in this report. The conceptual models developed here address nutrients, suspended and bedded sediments (...
The Effects of Mountaintop Mines and Valley Fills on Aquatic Ecosystems of the Central Appalachian Coalfields (External Review Draft)
(PUBLISHED REPORT) [Published : Apr 01, 2010]
This report assesses the state of the science on the environmental impacts of mountaintop mines and valley fills (MTM-VF) on streams in the Central Appalachian Coalfields. Our review focused on the aquatic impacts of mountaintop removal coal mining, which, as its name suggests, ...
AIR POLLUTION EFFECTS ON AQUATIC ECOSYSTEMS: SUMMARY OF A SYMPOSIUM
[Published : Dec 31, 1984]
Summarizing presentations at a symposium on air pollutant effects on aquatic ecosystems, this document includes an overview of U.S. research programs, atmospheric emissions and deposition, cycling processes, and effects on plants and animals. Current U.S. research addresses ecosy...
AQUATIC ECOSYSTEMS,
(BOOK CHAPTER) [Published : Nov 15, 2007]
Aquatic ecosystems are a vital part of the urban water cycle (and of urban areas more broadly), and, if healthy, provide a range of goods and services valued by humans (Meyer 1997). For example, aquatic ecosystems (e.g., rivers, lakes, wetlands) provide potable water, food resou...
Relationships Among Exceedences Of Chemical Criteria Or Guidelines, The Results Of Ambient Toxicity Tests And Community Metrics In Aquatic Ecosystems (Final)
(PUBLISHED REPORT) [Published : Jun 30, 2007]
The EPA document, <i>Relationships Among Exceedances of Chemical Criteria or Guidelines, the Results of Ambient Toxicity Tests, and Community Metrics in Aquatic Ecosystems</i>, presents two studies where the three general approaches for the ecological assessment of contaminant ex...
Aquatic Ecosystems, Water Quality, and Global Change: Challenges of Conducting Multi-Stressor Vulnerability Assessments (Final Report)
(PUBLISHED REPORT) [Published : Jul 31, 2011]
EPA announced the availability of the final report, <i>Aquatic Ecosystems and Global Change: The Challenges of conducting Multi-Stressor Global Change Vulnerability Assessments</i>. This report investigates the issues and challenges associated with identifying, calculating, and ...
Factors influencing perceptions of aquatic ecosystems
(JOURNAL) [Published : Feb 01, 2021]
While factors influencing perceptions of drinking water have been well studied, those of aquatic ecosystems have been to lesser extent. We conducted a review to improve awareness of these factors. Environmental factors found to influence public perceptions of aquatic ecosystems w...
Riparian spiders as sentinels of PCB contamination across heterogeneous aquatic ecosystems
(JOURNAL) [Published : May 01, 2017]
Riparian spiders are being used increasingly to track spatial patterns of contaminants in and fluxing from aquatic ecosystems. However, our understanding of the circumstances under which spiders are effective sentinels of aquatic pollution is limited. The present study tests the ...
Linking post-fire ecosystem responses to catchment characteristics to map wildfire vulnerability of aquatic ecosystems across the Pacific Northwest
(PRESENTATION) [Presented : Mar 06, 2020]
Across the Pacific Northwest the size and frequency of wildfires has been steadily increasing over the last two decades, potentially further stressing the region&rsquo;s aquatic ecosystems. However, aquatic ecosystems vary widely in their responses to wildfire, with some systems ...
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...
Factors influencing social demands of aquatic ecosystems
(JOURNAL) [Published : Oct 25, 2019]
Aquatic ecosystems provide services essential to human health and economies. Therefore, resource management programs aim to ensure the sustainable flow of these services. Stakeholder engagement is often a critical tool in learning what services are of priority to the public and m...
A METHODOLOGY FOR INFERRING THE CAUSES OF OBSERVED IMPAIRMENTS IN AQUATIC ECOSYSTEMS
(JOURNAL) [Published : Jun 01, 2002]
Biological surveys have become a common technique for determining whether aquatic communities have been injured. However, their results are not useful for identifying management options until the causes of apparent injuries have been identified. Techniques for determining causa...
ANION MOBILITY IN SOILS: RELEVANCE TO NUTRIENT TRANSPORT FROM TERRESTRIAL TO AQUATIC ECOSYSTEMS
[Published : May 24, 2002]
Nutrient transport from terrestrial to aquatic ecosystems is strongly mediated by soil chemical interactions. Ions deposited on or biologically released within the soil can enter into a variety of exchange and precipitation reactions prior to (or instead of) entering aquatic ecos...
Delineating resource sheds in aquatic ecosystems (presentation)
(PRESENTATION) [Presented : May 26, 2008]
Analysis of spatially-explicit ecological phenomena in aquatic ecosystems is impeded by a lack of knowledge of, and tools to delimit, spatial patterns of material supply to point locations. Here we apply the concept of "resource sheds" to coasts and watersheds. Resource sheds ar...
Development of resource shed delineation in aquatic ecosystems
(JOURNAL) [Published : Jan 01, 2010]
Environmental issues in aquatic ecosystems of high management priority involve spatially explicit phenomena that occur over vast areas. A "landscape" perspective is thus necessary, including an understanding of how ecological phenomena at a local scale are affected by physical fo...
Endocrine-Disrupting Compounds in Aquatic Ecosystems.
(BOOK CHAPTER) [Published : Feb 04, 2010]
Endocrine disrupting chemicals (EDCs) are a ubiquitous issue of concern in our aquatic systems. Commonly detected EDCs include natural and synthetic hormones, surfactants, plasticizers, disinfectants, herbicides and metals. The potency of these chemicals varies substantially, as ...
Environmental fate of multiwalled carbon nanotubes and graphene oxide across different aquatic ecosystems
(JOURNAL) [Published : Jan 01, 2019]
The industrial use and widespread application of carbon-based nanomaterials have caused a rapid increase in their production over the last decades. However, toxicity of these materials is not fully known and still being investigated for potential human and ecological health risks...
FATE AND EFFECTS OF NITROGEN AND PHOSPHORUS IN SHALLOW VEGETATED AQUATIC ECOSYSTEMS
(PUBLISHED REPORT) [Published : Jul 01, 2006]
High levels of nitrogen and phosphorus concentrations are a common problem in many waters of the United States. Efforts to control these nutrients have been on-going for the last 30-40 years. The focus of these efforts over this time has been primarily to address the reduction ...
Feeling the burn: current research and emerging issues in fire, water quality, and aquatic ecosystems
(PRESENTATION) [Presented : Jun 12, 2020]
Although wildfire is a natural disturbance in many ecosystems, wildfire extent and frequency are increasing across much of North America, particularly in the western United States. There is an urgent need for researchers, managers and the general public to understand and anticipa...
INCORPORATION OF DNA BARCODES INTO ASSESSMENTS OF THE BIOLOGICAL INTEGRITY OF AQUATIC ECOSYSTEMS: PRECISION, ACCURACY AND COST
(PRESENTATION) [Presented : May 18, 2007]
Historically, water quality assessments in the United States primarily focused on water chemistry assays at or near discharge sources. As it has become clear that waters also can be highly impaired from dispersed (i.e., non-point source) chemicals and non-chemical impacts, direc...
PROBLEM FORMULATION REPORT: FOR THE ASSESSMENT OF THE CONSEQUENCES OF GLOBAL CHANGE FOR AQUATIC ECOSYSTEMS
(UNPUBLISHED REPORT) [Published : Dec 08, 2004]
Meyer (1995) describes land use as "the way in which, and the purposes for which, human beings employ the land and its resources; for example, farming, mining, or lumbering" and land cover as "the physical state of the land surface: as in cropland, mountains, or forests". The def...
Resilience of aquatic ecosystems in farming areas: Implementing nutrient recovery systems in concentrated animal feeding operations
(PRESENTATION) [Presented : Aug 13, 2019]
The uncontrolled releases of nutrients to the environment, as phosphates, from anthropogenic activities such as livestock, are one of the most critical environmental issues affecting the water bodies in the United States. The presence of substantial amounts of phosphate, together...
Risk Assessment Considerations for Veterinary Medicines in Aquatic Ecosystems
(BOOK CHAPTER) [Published : Apr 01, 2010]
This chapter provides a critical evaluation of prospective and retrospective risk assessment approaches for veterinary medicines in aquatic ecosystems and provides recommendations for possible alternative approaches for hazard characterization.