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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 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 ...

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...

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...

Freshwater impoundments, like all inland aquatic systems, are sites of intense carbon processing and transport. They receive carbon in several forms (coarsely aggregated into dissolved and particulate fractions of both inorganic and organic forms), convert one C species to anothe...

The Groundwater Technical Support Center (GWTSC) is part of the Groundwater, Watershed, and Ecosystem Restoration Division (GWERD), which is based in the Robert S. Kerr Environmental Research Center in Ada, Oklahoma. The GWERD is a research division of EPA&rsquo;s National Risk M...

A presentation to be given at the 2018 APHL Annual Meeting and Twelfth Government Environmental Laboratory Conference. Harmful algal blooms or HABs are overgrowth of cyanobacteria in water bodies. These bacteria produce several harmful toxins (called cyanotoxins) that have detri...

Harmful algal blooms (HABs) were a topic of great interest at the 2018 ASLO Summer Meeting in Victoria, B.C., Canada (Fig. 1). This was no surprise, since HABs may become &ndash; and already are in some areas &ndash; the greatest water quality threat to public health and aquatic ...

Benthic invertebrates support numerous ecosystem functions and services including shellfish production, energy flow to fishes, and biogeochemical cycles. The decline of marine biodiversity worldwide has raised concerns about effects on ecosystems. To examine biodiversity trends o...

While the effects of urbanization on stream ecosystems have been well-documented, little is known regarding the impact of burying streams within culverts. Our project aims to explore the ecological impacts of stream burial at a fine spatial scale. Two culverted urban streams in C...

Land use and environmental stressors, such as drought and deteriorating water infrastructure, can accelerate the depletion of freshwater resources that support humans and ecosystem services. As global demand for water and environmental stressors increase, the quality and availab...

Anthropogenic activities, such as mining/smelting, result in the release and accumulation of heavy metal(loid)s in soil, posing serious human health and ecological risks. Due to the persistence of metal(loid)s, not undergoing any chemical and biological degradation, they can only...

Biological assessments (surveying the presence, number, size and condition of fish, coral and other biota) provide important information about the health and integrity of coral reef ecosystems. Biological criteria are one means under the Clean Water Act (CWA) that managers can us...

Atmospheric deposition remains one of the largest loadings of nutrients to the Chesapeake Bay Watershed (CBW). The interplay between future climate and emission changes, however, will cause shifts in the future nutrient deposition abundance and regime (e.g., oxidized vs. reduced...

Ecological restoration has traditionally been planned by evaluating ecosystem conditions, biodiversity, and production of ecosystem services, whereas evaluating the social benefits of restoration is uncommon. We present a decision-making approach to evaluate the social benefits o...

Forest disturbance regimes are beginning to show evidence of climate-mediated shifts associated with global climate change, and these patterns will likely continue due to continuing changes in environmental conditions. Tree growth is largely controlled by the physiological const...

Biogenic isoprene emissions play a very important role in atmospheric chemistry. They are strongly dependent on various environmental conditions, such as temperature, solar radiation, plant water stress, ambient ozone and CO2 concentrations, and soil moisture. Current biogenic ...

This paper addresses United States Environmental Protection Agency (EPA) operational and research challenges for the next decade in the utilization of space-based observations for the assessment of terrestrial properties affecting land, water, and air resources, and human health....

AQUATOX is an ecosystem simulation model that predicts the environmental fate of various pollutants, such as excess nutrients and organic chemicals, and their effects on aquatic ecosystems, including fish, invertebrates, and aquatic plants. AQUATOX is one of the preeminent tools ...