Exposure Pathways
Exposure Pathways
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New Method Improves Measurement of Bullet Fragments in Culled Varmints
A creative combination of radiography and techniques borrowed from meat processing and gold prospecting led to a better method for determining the lead content in ground squirrels shot by hunters to evaluate potential exposure risk to avian scavengers such as golden eagles ( Aquila chrysaetos ).
Low Levels of Contaminants Found in Great Lakes Tree Swallow Nestlings
Tree swallow nestlings at most study sites in the Great Lakes basin were minimally exposed to organic contaminants.
Presidential Early Career Award Given to Environmental Health Researcher Diann Prosser
Dr. Diann J. Prosser was awarded the Presidential Early Career Awards for Scientists and Engineers (PECASE).
Frequent Fliers—Web-Based Tool Aids in Understanding the Role of Wild Birds in Transmission of Avian Influenza
This visualization tool helps researchers and public health officials see how relations between poultry density and waterfowl migration routes affect the threat of avian influenza to people and the poultry industry.
Assessing Contaminant Hazards Without a Critter—Advancements in Alternatives to Animal Toxicity Testing
During the past two decades, great strides have been made toward the development and use of ecotoxicity testing methods that reduce animal use or replace animals altogether with in vitro tests or in silico models.
Fish Diets Switch From Aquatic to Terrestrial Insects in Streams Effected By Metal Contamination
A riparian zone rich in terrestrial insects can provide an alternate food source for fish in metal-impacted watersheds.
Is White Sucker Tumor Prevalence in some Wisconsin Rivers Related to Environmental Contaminant Exposures or Other Factors?
The incidence of particular skin and liver tumors on white suckers collected from some Wisconsin rivers corresponded to the degree of urban development within the watershed. Further research is needed to understand the relationship between exposure to urban-sourced contaminants and the initiation, promotion, and potential for population-level effects of these tumors.
Organic Contaminant Levels and the Reproductive Success of Ospreys in Chesapeake Bay
Changes in the regulation and use of some organic chemicals have caused environmental concentrations to stabilize or decline during the past 35 years coincident with a rebound in the osprey ( Pandion haliaetus ) population of the Chesapeake Bay.
Synthesis of Mercury Distribution and Bioaccumulation Across Western North America
The unique combination of natural processes and human activities present in western North America can strongly affect the exposure of fish and birds to methylmercury, the most toxic form of mercury (Hg).
Low Levels of Contaminants Found in Great Lakes Tree Swallow Eggs
Tree swallow eggs at most study sites in the Great Lakes basin were minimally exposed to legacy organic contaminants and brominated flame retardants.
New Hepatitis B Virus Discovered in White Sucker (Catostomus commersonii)
The first known hepatitis B virus to infect fish (white sucker; Catostomus commersonii ) has been discovered by U.S. Geological Survey (USGS) scientists.
New Sediment-Toxicity Benchmarks Available for Pesticides in Whole Sediment
U.S. Geological Survey (USGS) scientists developed 129 sediment-toxicity benchmarks for use in evaluating currently used pesticides in whole sediment.