Images

The field crew pulls in a surface trawl net in the Beaufort Sea, Alaska on the back deck of the R/V Proteus. 

USGS Alaska Science Center Biologist Ashley Stanek pulls a small mesh trawl net by hand to examine forage fish prey available for red-throated loons in Foggy Island Bay, Beaufort Sea, Alaska,

Vanessa von Biela (USGS – ASC) examines the empty cod end of a surface trawl net while looking for fish in the Beaufort Sea, Alaska.

A saffron cod (front, Eleginus gracilis) and an Arctic cod (behind, Boreogadus saida) from the Beaufort Sea, Alaska.

Geologist George Case approaches an old exploration trench exposing stratiform Ag-Sn-Pb-Zn mineralization in the Groundhog Basin deposit area.

USGS geologist George Case approaches an R66 helicopter with samples collected from mineralized rocks near the Groundhog Basin Ag-Sn-Pb-Zn deposit.

Rock hammer shows meter-scale width of a felsic sill associated with zinnwaldite-bearing Sn-granite at the Groundhog Basin Ag-Sn-Pb-Zn deposit. The layered host rocks to the sill are garnet-quartz-biotite gneiss.

USGS geologist George Case breaks mineralized rocks for examination and sample collection at the Groundhog Basin Ag-Sn-Pb-Zn deposit.

Alaska Native Science and Engineering Program (ANSEP) student Austin Bergerson attaching a coded metal band to the leg of red-throated loon (Gavia stellata).

Biologist Dan Donnelly processes fish caught in a midwater trawl aboard the USGS Alaskan Gyre.

A harbor seal rests in a bed of seaweed at low tide in Prince William Sound, Alaska.

A Bald Eagle flies off with a Black-legged Kittiwake from Gull Island in Kachemak Bay, Alaska

A Bald Eagle flies off with a Black-legged Kittiwake from a colony on Gull Island in Kachemak Bay, Alaska

Phytoplankton is filtered from lake water for analysis of mercury content. Photo courtesy of U.S. National Park Service, Public Domain.

Biologist collects water from a lake in Lake Clark National Park. Photo courtesy of U.S. National Park Service, Public Domain.

Juvenile sockeye salmon (Oncorhynchus nerka) captured in Lake Clark National Park as part of a study examining mercury in lake food webs.

Adult female caribou in the Porcupine herd equipped with a GPS-enabled video camera collar that shows the caribou’s point-of-view while consuming Eriophorum vaginatum (tussock cottongrass) heads within the coastal plain of the USFWS Arctic National Wildlife Refuge.

Lake trout (Salvelinus namaycush). Lake trout captured in Lake Clark National Park as part of a study to examine mercury biomagnification in lake food webs. Photo courtesy of U.S. National Park Service, Public Domain

USGS staff measuring streamflow at the Solomon Gulch Tailrace with a tethered Acoustic Doppler Current Profiler. This is one of 12 streamgages that the USGS Alaska Science Center operates in cooperation with hydropower providers across Alaska. Data are used for operation, regulation, and planning purposes.

USGS staff measuring discharge at the Solomon Gulch Hydropower tailrace, Valdez Alaska.

USGS biologists Steve Matsuoka, Lauren Hitt, and Rachel Richardson search for landbird nests in Denali National Park and Preserve.