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This dataset contains the growth index from annual growth bands in the shells of two bivalve clam species (Astarte borealis and Liocyma fluctuosa) captured in the Chukchi Sea, Alaska. The growth index is based on a measurement of the annual growth increment width that has been detrended for age-related differences in growth.
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Polar bears (Ursus maritimus) are difficult to study because of logistical challenges. Satellite radio collars are an excellent tool for efficiently collecting information on the distribution and habitat use of polar bears because they can be deployed for multiple years. Radio collars can be constructed using materials and devices that result in the collar falling off an animal so that the animal does not retain a non-functional collar indefinitely. However, the performance of "drop-off" materials and devices has been sub-optimal for many years. For example, collar release timer units (RTU), which cause the collar to detach from an animal at a pre-programmed point in time, can fail to function. Similarly, collar...
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This study focuses on a 67 attribute lake cover classification scheme covering the Bering Land Bridge area of the Seward Peninsula, Alaska. The GIS dataset consists of 5170 lakes (which were extracted from a 5m resolution ifSAR/orthophoto image) and provides information on lake morphometry, hydrologic connectivity, surface area dynamics, surrounding terrestrial ecotypes, bedfast percentage, and other important conditions. The Seward Peninsula lake habitat study classification system provides lake specific information for a coastal peninsula area that will guide research and aid in the management of the natural environment.
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This study focuses on the development of a 20 attribute lake cover classification scheme for the Fish Creek Watershed (FCW), which is located in the National Petroleum Reserve-Alaska (NPR-A). The GIS dataset consists of 4,362 lakes (which were extracted from a 5m resolution IfSAR/orthophoto image) covering 18% of the 4,900 km2 FCW and provides information on lake morphometry, hydrologic connectivity, surface area dynamics, surrounding terrestrial ecotypes, and other important aquatic conditions. The FCW lake cover classification scheme provides lake specific information for an arctic watershed that will guide research and aid in the management of the natural and human-modified environment.
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These data are part of the Gulf Watch Alaska (GWA) long-term monitoring program and contain diet data from Black-legged Kittiwakes (BLKI), Rhinoceros Auklets (RHAU), and Tufted Puffins (TUPU) located on Middleton Island in the Gulf of Alaska. This data release consists of seabird diet sample data and prey identification and morphometrics. Version History: First release: March 2023 Revised: October 2024 (ver. 2.0) Revised: February 2025 (ver. 3.0)
This data set contains a single table of descriptions of benthic samples collected in 1998 at Nelson and Izembek lagoons, Alaska. This includes: the weight of the sample, the species or species group of benthic animals (also vegetation) and their number, size and weight, and the amount of sand and gravel. These data provide a basis for additional studies that includes sampling of the benthos in Nelson and/or Izembek lagoons. These data are important as historic information useful in examining long-term changes in the lagoons in light of changing climate.
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These were data collected from polar bears from the southern Beaufort Sea during the spring between 2004 and 2016. Data include individual bear identification, age and sex class, capture date, capture year, open water season lengths, melt season length, and diet composition (expressed as a percentage of prey species). These data were used to determine whether polar bear diets have recently changed or remained stable over time.
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These data were part of a pilot tracking study of three adult female caribou from the Fortymile Herd in Alaska. The dataset is comprised of two comma separated values (.csv) files. Data includes: 1) processed (i.e., erroneous locations removed) GPS locations for caribou, received once per hour for 6 months (October 1998 to April 1999), and 2) spatial, temporal, and biological attributes of three female caribou tracked during the study.
This dataset consists of the complete set of aerial imagery and data from walrus haulouts collected by unoccupied aerial system (UAS) surveys near Pt. Lay, Alaska, during the autumns of 2018 and 2019. The data include: 1) georeferenced digital aerial imagery and flight logs from UAS surveys, and 2) orthoimages derived from the aerial imagery and flight logs by standardized structure from motion algorithms.
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Since 1993 the U.S. Geological Survey (USGS) has worked with the Alaska Department of Transportation and Public Facilities (ADOT&PF) to provide hydraulic assessments of scour for bridges throughout Alaska. As part of this effort, repeat channel cross section surveys, or channel soundings, have been collected at either the upstream or downstream side of bridges on an annual or as needed basis. Streambed and bank elevations are measured using USGS sounding weights and reels, weighted measuring tapes, acoustic Doppler current profilers, multibeam echo sounders and light detection and ranging and are referenced to the datum of as-built plan set to provide context for the streambed elevations in relation to bridge structures....
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These were data collected from polar bears from the Southern Beaufort Sea during the spring between 2007 and 2014. Data include individual ID, capture date, sex and age class, whether individuals visited bowhead whale carrion sites, exposure status relative to five pathogens, and concentrations of certain persistent organic pollutants.
This data package contains 3 tables presenting site selection information, basin characteristics, subsidy to streamflow from glacier mass loss data, and other streamflow statistics for selected streamgages in Alaska that were used to evaluate the influence of glacier mass loss on streamflow in Alaska and conterminous basins in Canada. The first ("site_selection_outcomes.csv") contains streamgage identification and site selection or omission details for 728 streamgages. The second ("streamflow_statistics_eligible_gages.csv") includes observed mean annual streamflow for the period of record through September 30, 2022, observed or estimated mean annual streamflow for the period 2000-2019, and associated period of record...
Available here are tracking data of Caribou, a terrestrial mammal that ranges between the Alaska and Canada. These data were collected from animals marked in interior and northern Alaska to understand seasonal movement patterns and the effects of fire regime on the movements. USGS Alaska Science Center scientists collect data from wildlife tracking devices to: determine locations of animals throughout their annual cycles, understand patterns of habitat use, quantify time spent on various behaviors, and identify geographic areas repeatedly used by wildlife that may indicate sites of importance to species and populations. Tracking data from other wildlife species can be found at: https://doi.org/10.5066/P9VYSWEH.
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These were data collected from polar bears from the Southern Beaufort Sea during the spring between 2013 and 2015. Data include individual identification, demographic characteristics, year, status for the current and prior year regarding use of land, concentrations of stress response and reproductive hormones, blood-based biomarker measures indicative of fasting, body mass index, and body condition. These data were used to assess factors influencing variation in measures of innate immunity, physiological stress, and concentrations in stress-response and reproductive hormones in polar bears.
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This data release contains two tables of information on polar bear distributions in the southern Beaufort Sea during spring, from 2001 to 2016. One table provides location (classified into 5 broad regions) of individual bears during the spring. The other table presents the aerial search effort by year and area.
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This dataset contains measures of oxygen consumption and stroke frequency from 1 captive subadult female polar bear (166.5 kg) resting in the water (n = 7 sessions) and swimming and diving in a metabolic swim flume with water circulated at approximately 0.6 km/hr during swimming and diving measurements (n = 6 sessions) in September 2017.
This dataset includes 15-minute interval data on stream temperature from low-order streams and main-stem rivers in the Noatak and Kobuk River valleys in Northwestern Alaska, collected during the summer months. The water temperatures were determined using a HOBO Water Temp Pro v2 (Onset Computer Corporation, Bourne, MA, USA)with ±0.2 °C accuracy. Sensors were place in several locations within each stream as well as in the main river below the tributary junction in order to assess stream thermal state.
This dataset is one table with demographic, morphometric, and blood analyte measurements from whole blood and serum samples taken from a subset of polar bears sampled in Alaska's southern Beaufort Sea during 1989-2012. The measured blood analytes include: blood urea nitrogen, creatinine, glucose, total protein, hemoglobin, red blood cell count, packed cell volume, and hemoglobin A1c (HbA1c).
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This dataset is in five tables with data from ecophysiological studies of free-ranging polar bears of the Southern Beaufort Sea subpopulation. They were equipped with high-resolution activity sensors, body temperature loggers, and GPS satellite-telemetry collars, to compare physiological state and activity of bears during natural behavior with that experienced by bears during helicopter recapture events (n = 14 bears). The data include: rectal temperatures for comparison to temperatures recorded by implanted loggers, levels of blood biochemical markers (n = 50 bears) related to elevated body temperature and stress for testing whether these markers were influenced by the duration of helicopter operations, ambient...


map background search result map search result map Fish Creek Watershed Lake Classification, NPRA, Alaska, 2016 Bering Land Bridge Lake Classification; Seward Peninsula, Alaska, 2012-2016 Measures of Oxygen Consumption and Stroke Frequency of a Captive Subadult Female Polar Bear (Ursus maritimus) while Resting in Water and Swimming and Diving in a Metabolic Water Flume, Oregon Zoo, 2017 Multistate Capture and Search Data from the Southern Beaufort Sea Polar Bear Subpopulation in Alaska, 2001-2016 Innate Immunity and Stress and Reproductive Hormone Metrics for Southern Beaufort Sea Polar Bears, 2013-2015 Benthos Sample Data from Izembek and Nelson Lagoons, Alaska, 1998 Pathogen and Contaminant Exposure Data from Southern Beaufort Sea Polar Bears, 2007-2014 Sex and Age Composition of Walrus Groups Hauled Out on Ice Floes in the Bering and Chukchi Seas, 2013-2015 Data Used to Assess the Acute Physiological Response of Polar Bears to Helicopter Capture Seabird Diet Data Collected on Middleton Island, Gulf of Alaska Walrus Haulout Aerial Survey Data Near Point Lay Alaska, Autumn 2018 and 2019 Stream Temperatures in the Noatak River and Kobuk River Basins, Northwest Alaska, 2017-2019 Diet Estimates of Southern Beaufort Sea Polar Bears, 2004-2016 Tracking Data for Caribou (Rangifer tarandus granti) in Alaska GPS Tracking Data for Caribou (Rangifer tarandus granti) from the Fortymile Herd, Alaska, 1998-1999 Sounding Cross Section Surveys at Alaska Bridge Crossings Data on the Deterioration of Different Types of Attachment Hardware on Sham Satellite Radio Collars Bivalve Shell Growth Indices, Chukchi Sea, Alaska, 1867-2015 Streamgage Attributes, Basin Characteristics, Subsidies from Glacier Mass Loss, and Streamflow Statistics, Selected Streamgages in Alaska, 2000-2019 Southern Beaufort Sea Polar Bear Hemoglobin A1c Data Measures of Oxygen Consumption and Stroke Frequency of a Captive Subadult Female Polar Bear (Ursus maritimus) while Resting in Water and Swimming and Diving in a Metabolic Water Flume, Oregon Zoo, 2017 Walrus Haulout Aerial Survey Data Near Point Lay Alaska, Autumn 2018 and 2019 Data on the Deterioration of Different Types of Attachment Hardware on Sham Satellite Radio Collars Stream Temperatures in the Noatak River and Kobuk River Basins, Northwest Alaska, 2017-2019 Fish Creek Watershed Lake Classification, NPRA, Alaska, 2016 Seabird Diet Data Collected on Middleton Island, Gulf of Alaska Benthos Sample Data from Izembek and Nelson Lagoons, Alaska, 1998 Bering Land Bridge Lake Classification; Seward Peninsula, Alaska, 2012-2016 Bivalve Shell Growth Indices, Chukchi Sea, Alaska, 1867-2015 Data Used to Assess the Acute Physiological Response of Polar Bears to Helicopter Capture Multistate Capture and Search Data from the Southern Beaufort Sea Polar Bear Subpopulation in Alaska, 2001-2016 GPS Tracking Data for Caribou (Rangifer tarandus granti) from the Fortymile Herd, Alaska, 1998-1999 Diet Estimates of Southern Beaufort Sea Polar Bears, 2004-2016 Southern Beaufort Sea Polar Bear Hemoglobin A1c Data Sex and Age Composition of Walrus Groups Hauled Out on Ice Floes in the Bering and Chukchi Seas, 2013-2015 Pathogen and Contaminant Exposure Data from Southern Beaufort Sea Polar Bears, 2007-2014 Streamgage Attributes, Basin Characteristics, Subsidies from Glacier Mass Loss, and Streamflow Statistics, Selected Streamgages in Alaska, 2000-2019 Sounding Cross Section Surveys at Alaska Bridge Crossings Tracking Data for Caribou (Rangifer tarandus granti) in Alaska Innate Immunity and Stress and Reproductive Hormone Metrics for Southern Beaufort Sea Polar Bears, 2013-2015