Images

Unuk River waterfalls from old lava pipes. Volcanic lava pipes form as the result of violent eruptions of deep-origin volcanoes. The Unuk River is one of the transboundary watersheds of Southeast Alaska.

Blue River confluence with Unuk River in the volcanic Iskut-Unuk River Cones region. The Unuk River is one of the transboundary watersheds of Southeast Alaska.

Pelagic cormorant, sitting on a cliff on Gull Island, which is located at Kachemak Bay, Alaska.

Three thick-billed Murres perched on the Pribilof Islands, off the coast of the mainland, Alaska.

Ablation stakes on Gulkana Glacier, Alaska. Late summer fieldwork on Gulkana Glacier reveals ablation stakes emerging from the ice. Measurements of the change in the height of the snow and ice at these stakes is one aspect of determining glacier mass balance.

A Common Murre holds a Northern Ronquil in its bill. Photo taken at Gull Island in Kachemak Bay, Alaska.

Fairweather Range, Alaska. The mountain range spans across Alaska and the Canadian province of British Columbia. Photo taken while flying over range.

Variation of weathering and lichen growth on the rock surface reveals veins and segregated zones with different mineralogy. 

Brian Robinson (USGS) and Ben Weitzman (NOAA) record observations along nearshore transects in Kachemak Bay, Alaska. USGS is studying the migration strategies and movement ecology of Black Oystercatchers as part of the new tracking study.

USGS Biologist Caitlin Marsteller releases a Black Oystercatcher after assisting with the collection of morphometric data and tagging. Data were collected from Black Oystercatchers as part of a new study to better understand migration strategies and movement ecology of the species.

USGS Biologist Caitlin Marsteller prepares to release a Black Oystercatcher after assisting with the collection of morphometric data and tagging. Data were collected from Black Oystercatchers as part of a new study to better understand migration strategies and movement ecology of the species.

A group of Pacific walruses during summer in the Chukchi Sea

Glaucous-winged gull with externally attached GPS satellite transmitter, Soldotna, Alaska

Upstream view of the Middle Fork Fortymile River near U.S. Geological Survey streamgage 15331000, Middle Fork Fortymile River near mouth near Chicken, Alaska

Barry Arm of Harriman Fjord, Prince William Sound, Alaska. Included is Barry Glacier and Cascade Glacier.

Experimental tanks used in a juvenile Pacific salmon heat stress experiment for Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (Oncorhynchus kisutch).

A juvenile Chinook salmon (Oncorhynchus tshawytscha) used in a heat stress experiment. Alaska Department of Fish and Game’s William Jack Hernandez Sport Fish Hatchery, Anchorage, Alaska, USA.

Maps displaying the spatial-temporal variability in the NPPSD 3.0 dataset

This is a photo of a juvenile gull flying over water in the Aleutian Islands, Alaska.

Fig 1 map showing total sampling effort (strip transects) of marine bird surveys at sea in the North Pacific Pelagic Seabird Database (NPPSD).

Example of a photo from the USFWS fall aerial survey for geese at Izembek Lagoon. Inset shows a closer view of four Black Brant (bottom) with a Cackling Goose (top) foraging on eelgrass. Scientists from the USGS Alaska Science Center and the U.S.