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Land cover changes associated with urbanization have negative effects on downstream ecosystems. Contemporary urban development attempts to mitigate these effects by designing stormwater infrastructure to mimic predevelopment hydrology, but their performance is highly variable. Th...

Atmospheric nitrogen deposition is predicted to have measurable impacts on the primary production of biomass in the northwestern Atlantic Ocean and the north Pacific Ocean. Both ocean regions are located downwind of high population densities with elevated sources of airborne nitr...

Reservoirs are a globally significant source of methane (CH4) to the atmosphere. However, emission rate estimates may be biased low due to inadequate monitoring during brief periods of elevated emission rates (i.e. hot-moments). Here we investigate CH4 bubbling (i.e. ebullition...

Over the last several years, chemical monitoring of the Colorado River near Moab, UT, has detected a variety of chemicals of emerging concern (CECs). However, given the lack of available effects data for most of the compounds detected, potential ecological risks, if any, associat...

It has been hypothesized that ecosystem health describes the state in which all processes operating within an ecosystem are functioning at a level of optimum efficiency to maximize system empower. In this study, systems analysis of networks and information flows is used within th...

Environmental geochemists frequently use archives of sediment, peat, and glacial ice to reconstruct historical trends in atmospheric mercury (Hg) deposition to ecosystems. We used a long-term fish archive, measuring Great Lakes whole fish Hg stable isotope ratios, to relate tempo...

Interactive web tools provide rich learning experiences for students of all levels. U.S. EPA&rsquo;s EnviroAtlas contains two primary tools for exploring ecosystem goods and services: An Interactive Map, which provides access to 300+ maps at multiple extents for the U.S., and an ...

Due to the large quantity of new chemicals being developed and potentially introduced into aquatic ecosystems, there is a need to prioritize chemicals with the greatest likelihood of ecological hazard for further research. To this end, a useful in silico estimation of ecotoxicity...

The industrial use and application of carbon-based nanomaterials (CNMs) have caused a rapid increase in their production over the last two decades. Current analytical methods for detecting CNMs in the environment are lacking, making environmental fate and transport modeling a pra...

Environmental geophysics investigates the geophysical response to natural and anthropogenic materials, processes, and alterations, which impact human health and ecosystems within the near surface of the earth. This presentation will cover biogeophysics, geophysical monitoring an...

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...

The Environmental Effects Assessment Panel (EEAP) is one of three Panels of experts that inform the Parties to the Montreal Protocol. The EEAP focuses on the effects of UV radiation on human health, terrestrial and aquatic ecosystems, air quality, and materials, as well as on the...

Headwater ephemeral tributaries are key external interfaces between uplands and downstream waters. Terrestrial coarse particulate organic matter (CPOM) is vital in fueling aquatic ecosystems, but the extent to which ephemeral tributaries are functionally connected to downstream w...

The South Platte River near Denver Colorado ranks among one of the most highly contaminated streams examined in a recent nationwide survey. The present research characterizes the distribution of three classes of biologically-active contaminants along a waste water impacted reach ...

The enzyme iodotyrosine deiodinase (dehalogenase, IYD) catalyzes iodide recycling and promotes iodide retention in thyroid follicular cells. Loss of function or chemical inhibition of IYD reduces available iodide for thyroid hormone synthesis, which leads to hormone insufficiency...

The St. Louis River watershed has been profoundly changed by over 150 years of human development that resulted in widespread pollution and habitat degradation, especially around the St. Louis River &ldquo;estuary&rdquo; near Lake Superior. In 1987, the river was designated as an ...

While there is a substantial literature on the importance of non-use values, the specification of ecosystem metrics best associated with those values is not well developed. Specification of such metrics is important for communicating the quality of a resource, and in evaluating h...

Aquatic ecosystems are affected by changes in both temperature and resource availability. While higher temperatures may result in increased food consumption and increased mercury (Hg) accumulation, they may also increase growth and reduce Hg tissue concentration through somatic d...

In the complex arena of sustainability, where the costs of failure can be high and stakeholders have multiple and sometimes conflicting interests, communities need measurement tools to characterize their current state, develop meaningful goals and quantifiable objectives for the ...

The report is a six volume series on the socioeconomics of visitor use of Puerto Rico&rsquo;s coral reef ecosystems. EPA is developing decision-support tools to evaluate restoration alternatives in Puerto Rico and elsewhere. The decision support tools include consideration or ass...

Surface water bodies adjacent to sites with contaminated groundwater may receive impacts that impair otherwise functional ecosystems and create new exposure pathways, increasing human health risks. Optimizing site characterization protocols to improve the remedy design effort is...

Gasoline composition in the U.S. varies due to market, technical and regulatory factors. Technical factors include seasonal and elevation adjustments for drivability, and needed anti-knock properties. Regulatory factors derive from the Clean Air Act and its amendments. The Clean ...

Disruption of thyroid hormone signaling is a form of endocrine disruption that is of concern to both human health and ecosystems. Research is being conducted to define the biological targets chemicals may interact with to disrupt thyroid hormone signaling and the stages in develo...

Disruption of thyroid hormone signaling is a form of endocrine disruption that is of concern to both human health and ecosystems. Research is being conducted to define the biological targets chemicals may interact with to disrupt thyroid hormone signaling and the stages in develo...

Non-invasive or minimally invasive near surface geophysics can yield three-dimensional maps of subsurface physical properties and aid high resolution site characterization. This presentation will demonstrate the application of geophysical methods for various site objectives such...