Filters: Tags: Bioaccumulation (X) > Extensions: Project (X)
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Robin Stewart's research is focused on identifying and understanding processes influencing the fate and bioavailability of selenium and mercury in food webs across a range of aquatic environments including estuaries, rivers, lakes and reservoirs.
Categories: Project;
Tags: Bioaccumulation,
Bioavailability,
Biogeochemistry,
Contaminants,
Ecology,
Research objectives: i) To determine whether metals, including dissolved, colloidal and particulate metals, are bioavailable and toxic to organisms; ii) To characterize and parameterize the physiological and geochemical processes governing metal bioaccumulation, toxicity and ultimately trophic transfer in aquatic ecosystems. iii) To model metal bioaccumulation and toxicity using kinetic models iv) To develop approaches that use isotopically modified metals, metal nanoparticles and metal bound to distinct mineral phases (such as Cu on ferric oxides) to quantify their bioavailability and toxicity to organisms, in particular invertebrates; v) To use enriched metal isotopes to gain mechanistic understanding of...
Description of Work This work will investigate linkages between sediment PCB concentrations and subsequent exposure in riparian organisms living on land next to the river and harbor. This is an extension of prior work at the site that has been used by the Manistique River and Harbor Remediation Team (comprised of managers and scientists from USEPA GLNPO, USEPA ORD, NOAA, USACOE, USGS and the state of Michigan) to guide plans for delisting activities. Riparian spiders are important mediators of contaminant flux from aquatic systems to nearby terrestrial habitats. Aquatic insects accumulate contaminants in their larval form, and transport these contaminants to terrestrial ecosystems in their adult bodies. Spiders...
Categories: Project;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Areas of concern,
Beneficial use impairment,
Bioaccumulation,
GLRI,
Great Lakes Restoration Initiative,
Description of Work U.S. Geological Survey (USGS) scientists are improving the health of the Great Lakes sport and commercial fisheries by documenting sources and the determining the processes that control mercury entering food webs, and helping to evaluate the implications for public health. Our scientists will provide decision-makers with a scientific understanding of mercury-source profiles, the relative importance of the various sources, and the expected environmental responses to Great Lakes wasters and fisheries to altered mercury loading and restoration actions. This information is intended to inform and maximize the benefit of the Great Lakes restoration program. The USGS will develop mercury and methylmercury...
Categories: Project;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Areas of concern,
Beneficial use impairment,
Bioaccumulation,
Deposition,
Ecosystem health,
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