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Folders: ROOT > ScienceBase Catalog > Alaska Science Center (ASC) ( Show direct descendants )

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These data are part of the Gulf Watch Alaska (GWA) long-term monitoring program, nearshore monitoring component. The dataset has one comma separated values (.csv) table with estimates of eelgrass (Zostera marina) percent cover. Eelgrass cover was estimated from sonar and video drop cameras deployed from boats following prescribed survey transects.
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This dataset contains drainage basin boundaries for 253 U.S. Geological Survey (USGS) streamgages in Alaska that had at least 5 years of daily streamflow through September 30, 2017, three of which were delineated for alternate basin conditions. This compilation includes selected boundaries produced in 2014 (https://doi.org/10.5066/P143KNEJ). Additional basin boundaries were delineated from the streamgage location to the nearest USGS Watershed Boundary Dataset (WBD) HUC boundary and along HUC boundaries from that intersection to the basin headwaters. Streamgages selected for drainage basin delineation included streamgages in Alaska that met selection criteria for a statewide study of seasonal flow regimes (Curran...
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This dataset consists of sample descriptions and radiocarbon age data from coastal environments on Montague Island, Alaska, analyzed at the National Ocean Sciences Accelerator Mass Spectrometry Facility.
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This dataset consists of one table with sample collection locations and results of screening resident wildlife for Cryptosporidium and Giardia in the Alaskan Arctic, 2012-2017. We analyzed feces collected from polar bear, Pacific walrus, Arctic fox, and caribou with MERIFLUOR direct immunofluorescence assay to determine the presence of Cryptosporidium oocysts and Giardia cysts.
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This data set describes nuclear microsatellite genotypes derived from six autosomal loci (AgCA222, Age7.1JT, BV13, BV20, NVH206, NVH195-2) in Cooper's Hawks. Samples originated from blood samples collected from live trapped birds. Version History: First release: December 2020 Revised: February 2022 (ver. 2.0)
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This data release has been SUPERSEDED. No data are provided here. The geospatial outlines and herd size estimates of Chukchi Sea autumn walrus haulouts, interpreted from Satellite imagery, have been combined into a single updated U.S. Geological Survey data release: https://doi.org/10.5066/P9CSM0KN This data release contains maps, geospatial files, and a table of the satellite imagery types with the dates when they were collected and examined to interpret the presence of, and area occupied by, walruses at terrestrial haulouts. Estimates of the land area occupied by walruses are provided based on interpretation by experienced image reviewers. The images are from a variety of Earth observing satellite imagery sources...
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These data are in seven tables relating to surveys of eelgrass (Zostera marina) and widgeongrass (Ruppia maritima) beds in embayments of the north Pacific coast of Baja California, Mexico. The tables provide environmental conditions, eelgrass and widgeongrass abundance, and measurements used to estimate their aboveground biomass. These tables also provide information on percent cover, location, and tide height of eelgrass, widgeongrass and seaweeds, and water conditions during the survey. Version History: First release: March 2022 Revised: April 2023 (ver. 2.0)
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This dataset provides shapefiles and tabular data representing river channel geometries measured on photogrammetric imagery and extracted from a photogrammetric digital elevation model (acquired August 2021) along the Totatlanika River in central Alaska. This is a child item of the USGS Data Release: https://doi.org/10.5066/F7X63KF2
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These data are comprised of two tables, one table containing wolverine (Gulo gulo) sample and genetic information for 20 microsatellite loci (Gg10-1, Gg25, Gg37-2, Gg42-1, Gg192-1, Gg443, Gg452, Gg454, Gg465, Gg471, Gg473, Gg-3-1, Gg-4, Gg-7-1, Ggu_216-1, Lut604, Ma-3-1, Mvis075, Tt-1, and Tt-4) and genetic sex determination results from North America and one Russian wolverine. All samples were obtained from collections at the University of Alaska Museum of the North or the University of New Mexico’s Museum of Southwestern Biology. The second table provides complete primer information for the genetic markers since several were redesigned from their originally-published sequences for this study.
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This dataset provides cycle threshold (Ct) values achieved during qPCR for 6 sex-linked genes, and two autosomal genes, for individuals from 60 species and across 13 orders of birds.
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This dataset consists of fossil diatom counts from sediment cores collected in coastal environments on Montague Island, Alaska, and analyzed at Virginia Tech University.
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This dataset is one table with results of tests to determine exposure of Chukchi Sea polar bears to a suite of pathogens. Results are serological tests for antibodies and tests of fecal samples for presence of parasites. Serologic assays were conducted for Toxoplasma gondii, Neospora caninum, Francisella tularensis, Coxiella burnetii, Leptospira spp., Brucella canis, Brucella abortus/suis, and canine distemper virus. Parasitology analyses were conducted for presence of Giardia cysts and Cryptospiridium oocysts in fecal samples. Polar bears were sampled on sea ice in the Chukchi Sea between mid-March and early May 1987-1994 and 2008-2017. The dataset includes relevant information about the bears that were captured...
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This dataset is one table with data collected and derived from polar bears sampled in Alaska's southern Beaufort Sea during 1983-2018. Collected data includes demographic and morphometric information. Derived data includes blood-based analyte values determined from whole blood and serum samples. Serum samples were analyzed on an Abaxis VS2 Biochemistry Analyzer and whole blood samples were analyzed on an Abaxis HM5 Diagnostic Analyzer. VS2 analysis quantified values of 13 biochemistry analytes for the period 1983-2016. Complete blood count (CBC) analyte values were quantified from the HM5 analysis for the period 2005-2018. These data were used to (i) generate reference ranges of serum biochemistry analyte values...
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This data package includes 17,014 pairs of raster geotiffs. Each pair is made up of two geotiff rasters derived from historical observations from Landsat satellites (04-09) over the Yukon, Kuskokwim, and Tanana rivers in Alaska. One raster reports estimated mid-day water surface temperature (ST) in degrees Celsius (deg_Cc). The second raster reports the surface temperature quality assessment (sST_QA_c) and provides the ST product uncertainty (also in degrees). The period of observation is May through October for the years 1984-2022.
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This dataset consists of sample details and radiocarbon age data of tree-ring samples collected near Girdwood, Alaska, and analyzed at the National Ocean Sciences Accelerator Mass Spectrometry Facility.
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This dataset consists of three tables related to abundance and distribution of northern sea otters (Enhydra lutris kenyoni) in lower Cook Inlet and the outer Kenai Peninsula, Alaska, based on data collected during a series of aerial surveys from May-Aug 2002. The dataset consists of: (1) sea otter counts along strip transects, (2) sea otter counts in Intensive Search Unit (ISU) within the transects, and (3) transect coordinates. **NOTE: 2002 data from survey sections in Kenai Fjords National Park are also included in another USGS data release available at https://doi.org/10.5066/F7CJ8BN7


map background search result map search result map Genetic Data from Wolverine (Gulo gulo) of North America Genetic Data from Cooper's Hawks (Accipiter cooperii), North America Point Sampling Data for Eelgrass (Zostera marina) and Widgeongrass (Ruppia marina) Abundance in Embayments of the North Pacific Coast of Baja California, Mexico Southern Beaufort Sea Polar Bear Blood Based Analyte Data, 1983-2018 Cryptosporidium and Giardia Occurrence Data in Wildlife from Arctic Alaska, 2012-2017 Pathogen Exposure Data for Chukchi Sea Polar Bears 1988-1994 and 2008-2017 Radiocarbon Data for Tree Ring Samples from Girdwood, Alaska Macroinvertebrates from Rivers in Northwest Alaska, 2015-2019 Radiocarbon Data from Coastal Environments on Montague Island, Alaska Historical Landsat-Derived Water Surface Temperature for Three Large Alaska Rivers 1984-2022 Diatom Data from Coastal Environments on Montague Island, Alaska Water Temperature, Electrical Conductivity, and Salinity of Lagoons in the Beaufort Sea, Alaska, 2017-2019 Selected Basin Boundaries for USGS Streamgages in Alaska through 2019 Tracking Data for Black Brant (Branta bernicla nigricans) Eelgrass (Zostera marina) Percent Cover Data from Katmai National Park and Preserve, Kenai Fjords National Park, and Prince William Sound, Alaska SUPERSEDED: Pacific Walrus Coastal Haulout Occurrences Interpreted from Satellite Imagery, 2023 Sea Otter Aerial Survey Data from Lower Cook Inlet and the Outer Kenai Peninsula, Alaska, 2002 Channel Geometry Data Collected Along the Totatlanika River, Alaska, August 2021 Radiocarbon Data for Tree Ring Samples from Girdwood, Alaska Diatom Data from Coastal Environments on Montague Island, Alaska Channel Geometry Data Collected Along the Totatlanika River, Alaska, August 2021 Radiocarbon Data from Coastal Environments on Montague Island, Alaska Water Temperature, Electrical Conductivity, and Salinity of Lagoons in the Beaufort Sea, Alaska, 2017-2019 Sea Otter Aerial Survey Data from Lower Cook Inlet and the Outer Kenai Peninsula, Alaska, 2002 Point Sampling Data for Eelgrass (Zostera marina) and Widgeongrass (Ruppia marina) Abundance in Embayments of the North Pacific Coast of Baja California, Mexico SUPERSEDED: Pacific Walrus Coastal Haulout Occurrences Interpreted from Satellite Imagery, 2023 Macroinvertebrates from Rivers in Northwest Alaska, 2015-2019 Eelgrass (Zostera marina) Percent Cover Data from Katmai National Park and Preserve, Kenai Fjords National Park, and Prince William Sound, Alaska Southern Beaufort Sea Polar Bear Blood Based Analyte Data, 1983-2018 Cryptosporidium and Giardia Occurrence Data in Wildlife from Arctic Alaska, 2012-2017 Historical Landsat-Derived Water Surface Temperature for Three Large Alaska Rivers 1984-2022 Genetic Data from Cooper's Hawks (Accipiter cooperii), North America Genetic Data from Wolverine (Gulo gulo) of North America Selected Basin Boundaries for USGS Streamgages in Alaska through 2019 Pathogen Exposure Data for Chukchi Sea Polar Bears 1988-1994 and 2008-2017 Tracking Data for Black Brant (Branta bernicla nigricans)