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

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This dataset contains taxonomic information, counts, and lengths of macroinvertebrates collected from rivers in northwest Alaska using drift and kick nets during summer and fall 2015-2019. Version History: First release: February 2024 Revised: August 2024 (ver. 1.1) Revised: December2024 (ver. 1.2)
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This data are a single table of nest records from a multi-year study of Pacific Common Eider (Somateria mollissima v-nigrum) biology that was conducted along the lower Kashunuk River, Kigigak Island, and the mouth of the Tutakoke River on the Yukon-Kuskokwim Delta from 1991-2004.
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This data package includes 2 child items with data from Pacific Black Brant (Branta bernicla nigricans) during winter and migration periods. Child Item 1: "Body mass, Morphological Measurements, Flock Counts, and Age-Ratios from Black Brant Overwintering in Three Lagoons Along the Baja California Peninsula, Mexico". The data include: (1) body mass and morphological measurements from sport hunter harvested brant, and (2) census counts of brant in Bahia de San Quintin, (3) counts for flock age ratio determination, and (4) behavior. Child Item 2: "Black Brant (Branta bernicla nigricans) Radio Detection and Migration Timing Alaska to Mexico". Data from brant tagged with VHF radio transmitters in July 1999 on the Yukon...
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Fragment data from 11 nuclear microsatellite loci and sequence data from the mitochondrial cytochrome b gene were gathered from Arctic cod (Boreogadus saida) in the Beaufort and Chukchi seas. Mitogenomic analyses of Arctic cod and three other co-distributed gadoids (Polar cod [Arctogadus glacialis], Saffron cod [Eleginus gracilis], Walleye Pollock [Gadus chalcogrammus]) were also completed. Transcriptomic analyses of Arctic cod were used to identify genes associated with environmental perturbations. Genome-wide scans using RAD-Seq of Arctic cod and the co-distributed Polar Cod were collected.
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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 dataset includes measures collected on polar bears captured in the Chukchi and Beaufort Seas, 1981-2017 by the U.S. Geological Survey and U.S. Fish and Wildlife Service. Data collected include body length, body mass, axillary girth, skull width and tail lengths. Bears were also aged as described in the methods. For some bears, an adipose tissue sample was collected and percent lipid content was measured, percent body fat was measured via bioelectrical impedance analysis, and/or recent feeding behavior was assessed via gut palpitation or blood urea and creatinine levels, all of which are further described in the methods. Version History: First release: July 2020 Revised: October 2024 (ver. 2.0)
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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 data release includes 2 child items with tracking data for Thick-billed Murres, a seabird species found in the Arctic and regions of the North Pacific and North Atlantic oceans. Child Item 1: "Argos Satellite Tracking Data for Thick-billed Murres (Uria lomvia) - Processed Data" Quality-controlled data collected from Argos satellite transmitters. Child Item 2: "Argos Satellite Tracking Data for Thick-billed Murres (Uria lomvia) - Raw Data" All raw data collected from Argos satellite transmitters, provided for completeness of the archive. The "Argos Processed Data" (Child Item 1) are better suited for most analytical purposes.
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This data release includes 1 child item with tracking data for Pacific Loons, a species that breeds throughout much of Alaska and winters throughout the Pacific Ocean basin, along the coasts of East Asia and North America. Child Item 1: "Argos Satellite Tracking Data for Pacific Loons (Gavia pacifica) - Processed Data" Quality-controlled data collected from Argos satellite transmitters.
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This data release includes 2 child items with tracking data for Red-throated Loons, a species that breeds in coastal areas throughout Alaska and winters along the Pacific coasts of North America and Eurasia. Child Item 1: "Argos Satellite Tracking Data for Red-throated Loons (Gavia stellata) - Processed Data" Quality-controlled data collected from Argos satellite transmitters. Child Item 2: "Argos Satellite Tracking Data for Red-throated Loons (Gavia stellata) - Raw Data" All raw data collected from Argos satellite transmitters, provided for completeness of the archive. The "Argos Processed Data" (Child Item 1) are better suited for most analytical purposes. Version History: First release: December 2017 Revised:...
Categories: Data, Data Release - Revised; Tags: Alaska, Animal tracking, Animals/Vertebrates, Argos, Biota, All tags...
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These data are estimates of den emergence date, den site departure dates, and duration at den sites as well as post-emergence observations for female polar bears sampled in the southern Beaufort Sea subpopulation 1985-2016 and the Chukchi Sea subpopulation 2008-2017. The data were used to better understand the importance of time spent at the den site post-emergence. Emergence dates and departure dates were determined using collar temperature sensor data.
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These data are part of the Gulf Watch Alaska (GWA) long term monitoring program, nearshore monitoring component. Specifically, these data describe sea otter (Enhydra lutris) aerial survey observations from the waters around Katmai National Park and Preserve from surveys conducted in 2008, 2012, 2015, and 2018. Sea otters are a keystone predator, well known for structuring the nearshore marine ecosystem through their consumption of invertebrate prey. The dataset consists of 3 comma-delimited files (CSV) exported from Microsoft Excel. The data consists of (1) Strip transect counts, (2) Intensive Search Unit (ISU) counts, and (3) Transect coordinates. For each aerial survey, a pilot flew an airplane at an altitude...
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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 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 data release includes 4 child items with geospatial datasets that characterize the distribution of eelgrass (Zostera marina) and seaweeds in waters of southwestern Alaska and Baja California, Mexico. Child Item 1: "Mapping Data of Eelgrass (Zostera marina) Distribution, Alaska Peninsula and Nunivak Island" Child Item 2: "Mapping Data of Eelgrass (Zostera marina) Distribution, Togiak National Wildlife Refuge, Alaska" Child Item 3: "Mapping Data of Eelgrass (Zostera marina) Distribution, Baja California, Mexico" Child Item 4: "Habitat Classification Data of Five Bays Along the West Coast of Baja California, Mexico"
Categories: Data; Tags: Alaska, Alaska Peninsula National Wildlife Refuge, Angiosperms (flowering plants), Animal and plant census, Animals/Invertebrates, All tags...
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These data are serum urea nitrogen and creatinine levels for polar bears captured in the southern Beaufort Sea 1983-2016 and the Chukchi Sea 1987-1993 and 2008-2017. The dataset includes relevant information about the bears that were captured including the latitude and longitude of their capture location, capture date, age class and sex, the age and number of cubs accompanying an adult female, and whether the bear denned during the previous winter or exhibited signs of being engaged in mating behavior at the time of or just prior to capture. Version History: First release: October 2017 Revised: January 2021 (ver. 2.0)
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This data package includes 2 child items with tracking data of buff-breasted sandpiper, a shorebird species that breeds only in Arctic Alaska and Canada, spending the winter in the grasslands of Brazil, Uruguay, and Argentina after a lengthy migration. Child Item 1: "Argos and GPS Satellite Tracking Data for Buff-breasted Sandpipers (Calidris subruficollis) - Processed Data" Quality-controlled data collected from Argos and Argos-linked GPS satellite transmitters. Child Item 2: "Argos and GPS Satellite Tracking Data for Buff-breasted Sandpipers (Calidris subruficollis) - Raw Data" All raw data collected from Argos and Argos-linked GPS satellite transmitters, provided for completeness of the archive. The "Processed...
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This data release includes 2 child items with tracking data for Blue-winged Teal, a duck species that breeds throughout much of North America and whose wintering range includes neotropical areas of the Caribbean and Central and South America, thus providing a migratory link between the continents of North and South America. Child Item 1: "Argos Satellite Tracking Data for Blue-winged Teal (Anas discors) - Processed Data" Quality-controlled data collected from Argos satellite transmitters. Child Item 2: "Argos Satellite Tracking Data for Blue-winged Teal (Anas discors) - Raw Data" All raw data collected from Argos satellite transmitters, provided for completeness of the archive. The The "Argos Processed Data"...
Categories: Data; Tags: Alberta, Anas discors, Animal tracking, Animals/Vertebrates, Argos, All tags...
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This dataset includes tables summarizing image information and bird counts from the aerial digital images taken over open water at Izembek Lagoon in Alaska in fall 2017-2019. These summaries list one record per image and provide the camera parameters, latitude, longitude, altitude, and automated and manual counts representing the total number of birds in each taxon (brant, white-cheeked geese, emperor geese, gulls, and other birds) identified in the image. The original images (.JPG format) and annotations are provided in an accompanying USGS data release (Weiser et al. 2022).


map background search result map search result map Gulf Watch Alaska Nearshore Component: Sea Otter Aerial Survey Data Katmai National Park and Preserve, 2008-2018 Genetic Data from Arctic, Polar, and Saffron Cod and Walleye Pollock, Alaska and Canada, 2011-2017 Tracking Data for Blue-winged Teal (Anas discors) Tracking Data for Red-throated Loons (Gavia stellata) Tracking Data for Pacific Loons (Gavia pacifica) Measurement Data of Polar Bears Captured in the Chukchi and Southern Beaufort Seas, 1981-2017 Pacific Common Eider (Somateria mollissima v-nigrum) Nest Records, Yukon-Kuskokwim Delta, Alaska, 1991-2004 Serum Urea and Creatinine Levels of Spring-Caught Polar Bears (Ursus maritimus) in the Southern Beaufort and Chukchi Seas Genetic Data from Cooper's Hawks (Accipiter cooperii), North America Data from Black Brant (Branta bernicla nigricans) Overwintering in Three Lagoons Along the Baja California Peninsula, Mexico Mapping Data of Eelgrass (Zostera marina) Distribution, Alaska and Baja California, Mexico Cryptosporidium and Giardia Occurrence Data in Wildlife from Arctic Alaska, 2012-2017 Tracking Data for Buff-breasted Sandpipers (Calidris subruficollis) Estimated Post-Emergence Period for Denning Polar Bears of the Chukchi and Beaufort Seas 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 Counts of Birds in Aerial Photos from Fall Waterfowl Surveys, Izembek Lagoon, Alaska, 2017-2019 Tracking Data for Thick-billed Murres (Uria lomvia) Data on the Deterioration of Different Types of Attachment Hardware on Sham Satellite Radio Collars Bivalve Shell Growth Indices, Chukchi Sea, Alaska, 1867-2015 Data on the Deterioration of Different Types of Attachment Hardware on Sham Satellite Radio Collars Counts of Birds in Aerial Photos from Fall Waterfowl Surveys, Izembek Lagoon, Alaska, 2017-2019 Pacific Common Eider (Somateria mollissima v-nigrum) Nest Records, Yukon-Kuskokwim Delta, Alaska, 1991-2004 Gulf Watch Alaska Nearshore Component: Sea Otter Aerial Survey Data Katmai National Park and Preserve, 2008-2018 Bivalve Shell Growth Indices, Chukchi Sea, Alaska, 1867-2015 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 Tracking Data for Pacific Loons (Gavia pacifica) Cryptosporidium and Giardia Occurrence Data in Wildlife from Arctic Alaska, 2012-2017 Tracking Data for Thick-billed Murres (Uria lomvia) Genetic Data from Cooper's Hawks (Accipiter cooperii), North America Serum Urea and Creatinine Levels of Spring-Caught Polar Bears (Ursus maritimus) in the Southern Beaufort and Chukchi Seas Tracking Data for Blue-winged Teal (Anas discors) Data from Black Brant (Branta bernicla nigricans) Overwintering in Three Lagoons Along the Baja California Peninsula, Mexico Mapping Data of Eelgrass (Zostera marina) Distribution, Alaska and Baja California, Mexico Measurement Data of Polar Bears Captured in the Chukchi and Southern Beaufort Seas, 1981-2017 Estimated Post-Emergence Period for Denning Polar Bears of the Chukchi and Beaufort Seas Genetic Data from Arctic, Polar, and Saffron Cod and Walleye Pollock, Alaska and Canada, 2011-2017 Tracking Data for Red-throated Loons (Gavia stellata) Tracking Data for Buff-breasted Sandpipers (Calidris subruficollis)