Two juvenile broad whitefish (Coregonus nasus) from the Beaufort Sea, Alaska. This study will evaluate the nearshore marine feeding areas of breeding adult red-throated loons and assess the response of loon reproductive success and nutritional content of nearshore fish communities.
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Two juvenile broad whitefish
Two juvenile broad whitefish (Coregonus nasus) from the Beaufort Sea, Alaska. This study will evaluate the nearshore marine feeding areas of breeding adult red-throated loons and assess the response of loon reproductive success and nutritional content of nearshore fish communities.
View of fog and clouds in the Aaron Creek valley, Alaska
View of fog and clouds in the Aaron Creek valley with tail of R66 helicopter in right foreground.
View of fog and clouds in the Aaron Creek valley with tail of R66 helicopter in right foreground.
Ice floating in the Beaufort Sea, Alaska
Chucks of ice floats in the Beaufort Sea, Alaska. This study site will evaluate the nearshore marine feeding areas of breeding adult red-throated loons and assess the response of loon reproductive success and nutritional content of nearshore fish communities.
Chucks of ice floats in the Beaufort Sea, Alaska. This study site will evaluate the nearshore marine feeding areas of breeding adult red-throated loons and assess the response of loon reproductive success and nutritional content of nearshore fish communities.
USGS Biologist Ashley Stanek pulls a small mesh trawl net by hand
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,
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,
Surface trawl retrieval
The field crew pulls in a surface trawl net in the Beaufort Sea, Alaska on the back deck of the R/V Proteus.
The field crew pulls in a surface trawl net in the Beaufort Sea, Alaska on the back deck of the R/V Proteus.
Looking for fish in the 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.
Vanessa von Biela (USGS – ASC) examines the empty cod end of a surface trawl net while looking for fish in the Beaufort Sea, Alaska.
Saffron cod and Arctic cod
A saffron cod (front, Eleginus gracilis) and an Arctic cod (behind, Boreogadus saida) from the Beaufort Sea, Alaska.
A saffron cod (front, Eleginus gracilis) and an Arctic cod (behind, Boreogadus saida) from the Beaufort Sea, Alaska.
USGS Geologist approaches an old exploration trench
Geologist George Case approaches an old exploration trench exposing stratiform Ag-Sn-Pb-Zn mineralization in the Groundhog Basin deposit area.
Geologist George Case approaches an old exploration trench exposing stratiform Ag-Sn-Pb-Zn mineralization in the Groundhog Basin deposit area.
USGS geologist approaches helicopter with samples
USGS geologist George Case approaches an R66 helicopter with samples collected from mineralized rocks near the Groundhog Basin Ag-Sn-Pb-Zn deposit.
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
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.
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 breaks mineralized rocks for examination and sample collection
USGS geologist George Case breaks mineralized rocks for examination and sample collection at the Groundhog Basin Ag-Sn-Pb-Zn deposit.
USGS geologist George Case breaks mineralized rocks for examination and sample collection at the Groundhog Basin Ag-Sn-Pb-Zn deposit.
Banding a red-throated loon
Alaska Native Science and Engineering Program (ANSEP) student Austin Bergerson attaching a coded metal band to the leg of red-throated loon (Gavia stellata).
Alaska Native Science and Engineering Program (ANSEP) student Austin Bergerson attaching a coded metal band to the leg of red-throated loon (Gavia stellata).
Trawl catch processing
Biologist Dan Donnelly processes fish caught in a midwater trawl aboard the USGS Alaskan Gyre.
Biologist Dan Donnelly processes fish caught in a midwater trawl aboard the USGS Alaskan Gyre.
Happy harbor seal
A harbor seal rests in a bed of seaweed at low tide in Prince William Sound, Alaska.
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
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 Gull Island in Kachemak Bay, Alaska
A Bald Eagle flies off with a Black-legged Kittiwake, Alaska
A Bald Eagle flies off with a Black-legged Kittiwake from a colony on 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
Filtering phytoplankton from lake water
Phytoplankton is filtered from lake water for analysis of mercury content. Photo courtesy of U.S. National Park Service, Public Domain.
Phytoplankton is filtered from lake water for analysis of mercury content. Photo courtesy of U.S. National Park Service, Public Domain.
Water collection, Alaska
Biologist collects water from a lake in Lake Clark National Park. 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, Alaska
Juvenile sockeye salmon (Oncorhynchus nerka) captured in Lake Clark National Park as part of a study examining mercury in lake food webs.
Juvenile sockeye salmon (Oncorhynchus nerka) captured in Lake Clark National Park as part of a study examining mercury in lake food webs.
Scientist holding lake trout
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
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
Caribou eating tussock cottongrass heads
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.
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.