Images

Male and female mallard ducks swimming along at Blackwater National Wildlife Refuge near Cambridge, MD.  

Red Knots, a migratory shorebird, flying over a salt marsh in coastal Worcester County, Maryland

USGS scientist Vicki Blazer obtaining a blood sample and performing fish necropsy for fish health assessments

American kestrel used to assess anticoagulant hazard to non-target raptors. Development of a Physiologically-Based Pharmacokinetic Model for Rodenticides Modifications; Toxicity of biologically incorporated chlorophacinone; Sequential Exposures to First and Second Generation Rodenticides by Non-target Raptors 

A Lincoln's Sparrow wintering at the Patuxent Research Refuge with the Eastern Ecological Science Center.

 

Pine Warbler foraging on a cold spring day foraging on the ground.  Photo courtesy of Mikey Lutmerding, Wildlife Biologist.  Photo taken at Point Lookout State Park, Scotland, MD

Pine Warbler foraging on a cold spring day foraging on the ground.  Photo courtesy of Mikey Lutmerding, Wildlife Biologist.  Photo taken at Point Lookout State Park, Scotland, MD.

A juvenile Prairie Warbler at a stopover site along the Chesapeake Bay.  Photo courtesy of Michael Lutmerding of the EESC

USGS Scientists John Young (L), Jennifer Rapp (Center), and Kelly Maloney (R) take a break from collecting river bottom elevations on the Delaware River with GPS and boat-based sonar for a study investigating bathymetric lidar mapping capabilities.  

Experiment to determine if Eastern fence lizards can carry the Lyme disease spirochete

Assessing exposure to environmental contaminants in Chesapeake Bay ospreys.  Contaminant exposure, food chain transfer and potential health effects on fish and ospreys (Pandion haliaetus) in Chesapeake and Delaware Bays

Studies of environmental contaminant exposure in the osprey and their food web in Chesapeake Bay

Eastern screech owl used to study to assessment anticoagulant rodenticide hazards to non-target wildlife

Researchers counting and measuring stream fishes sampled as part of a multi-year study of the effects of streamflow variation on fish population dynamics.  This work was a component of the USGS WaterSMART, Apalachicola-Chattahoochee-Flint focal area study. Shown right to left: Rachel Katz (Univ. of GA), Paula Marcinek (GA DNR), and Mary Freeman (USGS).

An example of a disappearing marsh in the Eastern Shore of Maryland part of the  Mid-Atlantic USA.

Headwater stream

Blue Ridge Sculpin from Wikimedia Commons

USGS field crews tagging an adult male horseshoe crab (Limulus polyphemus) in Delaware Bay to study survival and movement.

Measuring marsh surface elevation to determine if marshes are keeping up with sea level rise

Box turtle with trail laying device designed by Dr. Lucille Stickel in the 1940s. To track turtle movements, Dr. Stickel improved on an earlier trailer design described in 1927 and noted, “Details of travels can be followed for weeks or months by attaching thread- laying devices to their carapaces.

A researcher measures the snout-vent length of a red eft (Notophthalmus viridescens). The snout-vent length is a measure of the length of a salamander from its snout to its cloaca (located just behind the hind legs).