Pacific walrus group hauled-out on sea ice in the Chukchi Sea. The photo was captured during a survey of the age structure of the population to evaluate population status. Observers assign each animal in a group to an age/sex category according to published criteria. USFWS Permit No. 33776D.
Images
Browse images from a wide range of science topics covered by USGS. All items in this gallery are considered public domain unless otherwise noted.
Pacific walrus group hauled-out on sea ice in the Chukchi Sea. The photo was captured during a survey of the age structure of the population to evaluate population status. Observers assign each animal in a group to an age/sex category according to published criteria. USFWS Permit No. 33776D.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
Orange streams are increasingly common in the Brooks Range of northern Alaska. The orange stream color reflects oxidized iron, but also often indicates elevated heavy metal concentrations. Our ongoing study aims to document these occurrences and the timing of their onset.
![Effects of the North Pacific Marine Heatwave on Ocean Food Webs infographic](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/media/images/Effects_Heatwave_FoodWebs.jpg?itok=V7Wtzj3D)
Infograph describing the effects of North Pacific marine heatwave on ocean food webs.
Infograph describing the effects of North Pacific marine heatwave on ocean food webs.
Chester Creek streamgage along the Lanie Fleischer Chester Creek Trail.
Chester Creek streamgage along the Lanie Fleischer Chester Creek Trail.
The USGS Alaska Science Center is working with healthy, captive walruses in the U.S.
The USGS Alaska Science Center is working with healthy, captive walruses in the U.S.
An infographic that highlights a study describing four main mechanisms by which marine heatwaves affect seabirds and marine ecosystems, i.e., (1) habitat modification, (2) physiological forcing, (3) behavioral responses, and (4) ecological processes or species interactions. Study findings indicate that marine heatwaves can affect seabirds directly by creating
An infographic that highlights a study describing four main mechanisms by which marine heatwaves affect seabirds and marine ecosystems, i.e., (1) habitat modification, (2) physiological forcing, (3) behavioral responses, and (4) ecological processes or species interactions. Study findings indicate that marine heatwaves can affect seabirds directly by creating
![Crosshatching in map shows the general area along Alaska's west coast where the Norseman II may sail to observe walruses.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/media/images/ResearchCruiseOperations2023_0.jpg?itok=MaohZOvz)
Map of area where USGS and USFWS may observe Pacific walrus during marine cruises of the Norseman II starting in summer of 2023
linkCrosshatching in the map shows the general area where the Norseman II may sail to observe walruses from June 5 to July 2, 2023, as part of a USGS and USFWS project to study Pacific walrus population dynamics.
Map of area where USGS and USFWS may observe Pacific walrus during marine cruises of the Norseman II starting in summer of 2023
linkCrosshatching in the map shows the general area where the Norseman II may sail to observe walruses from June 5 to July 2, 2023, as part of a USGS and USFWS project to study Pacific walrus population dynamics.
This figure shows flow rates in Chester Creek (Anchorage, Alaska) by month for 2022 (black line) and the range of water flow rates (above and below normal flows shown by different colors) for the entire 44 years of data collection at Chester Creek.
This figure shows flow rates in Chester Creek (Anchorage, Alaska) by month for 2022 (black line) and the range of water flow rates (above and below normal flows shown by different colors) for the entire 44 years of data collection at Chester Creek.
![Graphic showing oil pipeline next to road with trucks and semi traffic. Caribou near road with Alaska oil field building.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/media/images/Caribou_Graphic.jpg?itok=taZ9x2Vz)
This is a graphical abstract for the publication by Severson et al. (2023) that investigated the influence of vehicle traffic in Northern Alaska oil fields on summer space use and road crossings of female caribou in the Central Arctic Herd.
This is a graphical abstract for the publication by Severson et al. (2023) that investigated the influence of vehicle traffic in Northern Alaska oil fields on summer space use and road crossings of female caribou in the Central Arctic Herd.
Comparison of the body area of walruses in human care in two positions (head up and flat) used for estimating body mass.
Comparison of the body area of walruses in human care in two positions (head up and flat) used for estimating body mass.