Images

Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.

Surficial sediment collection on Wilson Park Creek, Milwaukee, WI.

Sunset on the Milwaukee River at Estabrook Park.

Example excitation-emission spectra from analysis of raw wastewater and stream samples using a laboratory-based instrument.

A USGS scientist collecting a discrete water-quality sample.

Bad River Watershed, Wisconsin

Little Muskego Lake, WI sediment core mounted on sediment extrusion device.

USGS scientist inspects three sediment cores from Lake Mendota, WI prior to sediment extrusion.

0.50 cm section of lake sediment from Lake Mendota, WI.

USGS scientists prepare to sample lake bed sediment on Lake Mendota, WI.

This photomicrograph shows a liver of a frog with a severe Perkinsea infection.

USGS scientist collecting samples of aquatic species from the Pike River, Wis., for later analysis of mercury contamination

This microscopic image shows a sun-shaped area within turtle skin cells where chelonid herpesvirus 5 replicates. The virus capsids, or protein shells, are arrayed like a corona around the circle. ChHV5 is associated with fibropapillomatosisa tumor disease affecting endangered green turtles.

Monarch butterfly on a Joe Pyeweed plant.

A monarch butterfly on a hairy puccoon plant.

National Wildlife Health Center — Madison, Wisconsin. Digestive gland from a freshwater snail (Lymnaea stagnalis)

Milwaukee River flows through downtown Milwaukee, Wisconsin during an autumn sunset.

Scenic landscape from Hells Canyon Reservoir, Idaho

Fog surrounds the USGS Research Vessel Arcticus as it comes into port at Sturgeon Bay, Wisconsin.

Stream gage house at Honey Creek upstream of confluence with the Menomonee River (04087119).

Styrene-butadiene rubber (SBR) from automotive tires, artificial turf fields, or playgrounds collected from bed sediment on the Menomonee and Milwaukee Rivers.