Scientists study tree swallows (Tachycineta bicolor) in the Great Lakes region to determine chemical exposure, physiological response, and reproductive success.
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Tree Swallow Chicks
Scientists study tree swallows (Tachycineta bicolor) in the Great Lakes region to determine chemical exposure, physiological response, and reproductive success.
Field sampling boat with USGS PFD in the Great Salt wetlands
Field sampling boat with USGS PFD in the Great Salt wetlandsWetland habitats, such as the Great Salt Lake wetlands, provide critical feeding areas for many fish and wildlife species.
Field sampling boat with USGS PFD in the Great Salt wetlands
Field sampling boat with USGS PFD in the Great Salt wetlandsWetland habitats, such as the Great Salt Lake wetlands, provide critical feeding areas for many fish and wildlife species.
A typical tree swallow (Tachycineta bicolor) studied by the scientists
A typical tree swallow (Tachycineta bicolor) studied by the scientistsA typical tree swallow (Tachycineta bicolor) studied by the scientists.
A typical tree swallow (Tachycineta bicolor) studied by the scientists
A typical tree swallow (Tachycineta bicolor) studied by the scientistsA typical tree swallow (Tachycineta bicolor) studied by the scientists.
A Tree Swallow - Tachycineta Bicolor
A typical tree swallow (Tachycineta bicolor) in the Great Lakes area. Tree swallows were studied by the scientists for contaminants in the eggs.
A typical tree swallow (Tachycineta bicolor) in the Great Lakes area. Tree swallows were studied by the scientists for contaminants in the eggs.
A U.S. Geological Survey chemist evaporating sample extracts
A U.S. Geological Survey chemist evaporating sample extractsOrganic Chemistry Research Laboratory — Sacramento, California. USGS chemist working with samples in a laboratory hood
A U.S. Geological Survey chemist evaporating sample extracts
A U.S. Geological Survey chemist evaporating sample extractsOrganic Chemistry Research Laboratory — Sacramento, California. USGS chemist working with samples in a laboratory hood
U.S. Geological Survey chemist homogenizes a tissue sample
U.S. Geological Survey chemist homogenizes a tissue sampleOrganic Chemistry Research Laboratory — Sacramento, California. USGS chemist homogenizes a tissue sample into a mortar and pestle
U.S. Geological Survey chemist homogenizes a tissue sample
U.S. Geological Survey chemist homogenizes a tissue sampleOrganic Chemistry Research Laboratory — Sacramento, California. USGS chemist homogenizes a tissue sample into a mortar and pestle
USGS Scientist Collecting a Liver Tissue Sample from a Wild-Caught Whi
USGS Scientist Collecting a Liver Tissue Sample from a Wild-Caught WhiA U.S. Geological Survey (USGS) scientist collecting a liver tissue sample from a wild-caught white sucker (Catostomus commersonii) from a river in the Great Lakes area.
USGS Scientist Collecting a Liver Tissue Sample from a Wild-Caught Whi
USGS Scientist Collecting a Liver Tissue Sample from a Wild-Caught WhiA U.S. Geological Survey (USGS) scientist collecting a liver tissue sample from a wild-caught white sucker (Catostomus commersonii) from a river in the Great Lakes area.
Lip tumor diagnosed as a papilloma on a white sucker
Lip tumor diagnosed as a papilloma on a white suckerA lip tumor diagnosed as a papilloma on a white sucker (Catostomus commersonii) collected from the Milwaukee River.
Lip tumor diagnosed as a papilloma on a white sucker
Lip tumor diagnosed as a papilloma on a white suckerA lip tumor diagnosed as a papilloma on a white sucker (Catostomus commersonii) collected from the Milwaukee River.
Surface Tumor on White Sucker
Body surface tumor diagnosed as a squamous cell carcinoma on a white sucker fish
Body surface tumor diagnosed as a squamous cell carcinoma on a white sucker fish
Dairy cows in an animal feeding operation in New York
Dairy cows in an animal feeding operation in New YorkDairy cows in an animal feeding operation in New York
Dairy cows in an animal feeding operation in New York
Dairy cows in an animal feeding operation in New YorkDairy cows in an animal feeding operation in New York
Remnants of a spruce forest
Remnants of a spruce forest complex following a severe wildfire in the Yukon Flats National Wildlife Refuge, Alaska. Wildfires are the dominant landscape-scale disturbance operating at annual time scales in Alaska, and fires play a major role in the rate and extent of vegetation growth and productivity of a site.
Remnants of a spruce forest complex following a severe wildfire in the Yukon Flats National Wildlife Refuge, Alaska. Wildfires are the dominant landscape-scale disturbance operating at annual time scales in Alaska, and fires play a major role in the rate and extent of vegetation growth and productivity of a site.
Cedar Creek in Congaree National Park, South Carolina
Cedar Creek in Congaree National Park, South CarolinaCedar Creek in Congaree National Park, SC, showing old growth bottomland hardwood forest
Cedar Creek in Congaree National Park, South Carolina
Cedar Creek in Congaree National Park, South CarolinaCedar Creek in Congaree National Park, SC, showing old growth bottomland hardwood forest
Photograph Showing White-Faced Ibis Nesting
Photograph showing white-faced ibis nesting at Bear River Migratory Bird Refuge, Great Salt Lake, Utah. U.S.
Photograph showing white-faced ibis nesting at Bear River Migratory Bird Refuge, Great Salt Lake, Utah. U.S.
USGS scientists measured the concentrations of EDCs in Spirit Creek
USGS scientists measured the concentrations of EDCs in Spirit CreekUSGS scientists measured the concentrations of select endocrine disrupting chemicals (EDCs) in Spirit Creek, Georgia, as part of an assessment of the effects of the closure of a wastewater treatment plant. Sprit Creek is typical of a stream in coastal environments.
USGS scientists measured the concentrations of EDCs in Spirit Creek
USGS scientists measured the concentrations of EDCs in Spirit CreekUSGS scientists measured the concentrations of select endocrine disrupting chemicals (EDCs) in Spirit Creek, Georgia, as part of an assessment of the effects of the closure of a wastewater treatment plant. Sprit Creek is typical of a stream in coastal environments.
Winter Time Water Quality Sampling
U.S. Geological Survey (USGS) hydrologist making field notes during winter water quality sampling from a stream in north central Iowa.
U.S. Geological Survey (USGS) hydrologist making field notes during winter water quality sampling from a stream in north central Iowa.
Freshwater snail used in the laboratory exposure tests
Freshwater snail used in the laboratory exposure testsPicture of the freshwater snail (Lymnaea stagnalis) used in the laboratory exposure tests to understand metal uptake and bioavailability.
Freshwater snail used in the laboratory exposure tests
Freshwater snail used in the laboratory exposure testsPicture of the freshwater snail (Lymnaea stagnalis) used in the laboratory exposure tests to understand metal uptake and bioavailability.
Stream Mycotoxin Concentrations were Highest During Spring Snowmelt
Stream Mycotoxin Concentrations were Highest During Spring SnowmeltHighest stream mycotoxin concentrations were observed during spring snowmelt conditions in agricultural settings such as pictured in this Iowa stream.
Stream Mycotoxin Concentrations were Highest During Spring Snowmelt
Stream Mycotoxin Concentrations were Highest During Spring SnowmeltHighest stream mycotoxin concentrations were observed during spring snowmelt conditions in agricultural settings such as pictured in this Iowa stream.
The mayfly is an insect scientists use to study bioaccumulation
The mayfly is an insect scientists use to study bioaccumulationThe mayfly (Cinygmula) is one of the insects scientists use to study the bioaccumulation of dissolved and dietary metals.
The mayfly is an insect scientists use to study bioaccumulation
The mayfly is an insect scientists use to study bioaccumulationThe mayfly (Cinygmula) is one of the insects scientists use to study the bioaccumulation of dissolved and dietary metals.
Laboratory approaches for quantifying microbial process rates and analyte concentrations
Laboratory approaches for quantifying microbial process rates and analyte concentrationsLeft: Distillation rig used in the measurement of microbial sulfate reduction rates associated with a method based on the incubation of sediment samples with radioactively labeled sulfate. Photographer: M. Marvin-DiPasquale. Date: 3/5/2001.
Laboratory approaches for quantifying microbial process rates and analyte concentrations
Laboratory approaches for quantifying microbial process rates and analyte concentrationsLeft: Distillation rig used in the measurement of microbial sulfate reduction rates associated with a method based on the incubation of sediment samples with radioactively labeled sulfate. Photographer: M. Marvin-DiPasquale. Date: 3/5/2001.
USGS Hydrographers Collecting Water-Quality Sample at the Zumbro River
USGS Hydrographers Collecting Water-Quality Sample at the Zumbro RiverUSGS hydrographers collecting a water-quality sample at the Zumbro River near Rochester, Minnesota
USGS Hydrographers Collecting Water-Quality Sample at the Zumbro River
USGS Hydrographers Collecting Water-Quality Sample at the Zumbro RiverUSGS hydrographers collecting a water-quality sample at the Zumbro River near Rochester, Minnesota
Testing Coal-Tar Sealcoats for Toxic PAH Emissions
Testing Coal-Tar Sealcoats for Toxic PAH EmissionsA professional applicator applies coal-tar-based sealcoat to a test plot used to measure emission of polycyclic aromatic carbons (PAHs) into the air.
Testing Coal-Tar Sealcoats for Toxic PAH Emissions
Testing Coal-Tar Sealcoats for Toxic PAH EmissionsA professional applicator applies coal-tar-based sealcoat to a test plot used to measure emission of polycyclic aromatic carbons (PAHs) into the air.