Images

A three year study was conducted in seasonal wetlands to determine if a deep and shallow water pool resulted in a reduction of methylmercury in caged fish and surface water.

Graphical depiction of a seasonal wetland engineered to have a deeper pool and more open water on the downstream side of the wetland. This management strategy was tested during a 3-year period to determine if it resulted in a reduction of methylmercury in caged fish and surface water.

Sediment core sample taken at Grubers Grove Bay on the Wisconsin River, Wisconsin.

(A). Algal bloom magnitude in Florida lakes in 2011 before normalization and (B) after normalization by lake surface area. Area-normalized magnitude (km⁻²) of selected lakes provided as part of bar labels in parenthesis.

Map of the study region showing the location of lakes in (A) Florida and (B) Ohio. In total, 135 lakes in Florida and 21 lakes in Ohio, were resolvable with the full resolution MERIS data and are used in this study. Land and lakes are shown in gray and blue colors respectively.

USGS Mercury research team collecting fish in Everglades National Park, Florida.

Scientists filtering water in the field at Everglades National Park, Florida.

Internal look at the MC-ICP-MS flight tube when magnet is removed.

This photo show runoff from an experimental plot through a weir.  Scientists carried out the study at the Oklahoma State University South Central Research Station in Chickasha, Oklahoma. Its a good example of rain induced runoff. 

Row of lab bubblers sample purging prior to analysis at the Mercury Research Laboratory in Middleton, WI.

Graphical depiction of three sources of variation that can affect accumulation of methylmercury in black rails: habitat (sediment) biogeochemistry, food web structure and biomagnification, and diet composition. Methylmercury moves from the sediment into the wetland food web and accumulates in rail tissues.

Methylmercury photodecomposition experiment on the roof of USGS building in Middleton, WI.

The cyanobacteria Gleotrichia shown under a microscope from a water sample collected at Ek Lake Trail, a popular recreational area in Kabetogama Lake where algal blooms frequently occur. Gleotrichia  can produce microcystin.

An algal bloom forming in Kabetogama Lake near Kabetogama Visitor Center, Voyageurs National Park

Erie pier pond in the Saint Louis River estuary in Duluth, MN.

Collecting a sediment core with the freezing drive shoe technology on a hollow stem auger drill rig at Bemidji oil spill site.

Groundwater sampling along the north well transect at the Bemidji site.

Group photo of USGS Bemidi oil spill research team meeting in June of 2019 at Ruttgers Birchmont Lodge in Bemidji, MN.

Fishing on Hells Canyon Reservoir, Snake River, Idaho-Oregon. Photo Credit: Austin Baldwin

Scientist in field assessing soil sampling locations at the Badger Army Ammunition Plant site in Sauk County, WI.

A hyperpigmented melanistic skin lesion on a Smallmouth Bass from the Chesapeake Bay Watershed.