Aerial Survey Counts of Harbor Seals in Coastal Alaska (1998-2002)

Metadata Updated: March 26, 2021

This dataset supports efforts to estimate the abundance and trends in population size of Alaska harbor seals. Annual surveys of harbor seal populations are fundamental to estimation of seal abundance, distribution, and trends, which in turn are essential for stock assessment, conservation, and management. The most feasible approach to determining harbor seal distribution and abundance is to use aircraft to count seals when they haul out of the water and are visible. Harbor seals in Alaska occupy a geographically extensive range from approximately long. 172��E to 130��W (over 3,500 km east to west) and from lat. 51��N to 61.5��N (over 1,000 km north to south). Estimation of the abundance of harbor seals statewide requires broad-scale aerial surveys and these surveys have been conducted by NOAA Fisheries, the Alaska Department of Fish and Game, and other collaborators since the early 1980s. This dataset reflects counts of harbor seals from surveys conducted in Alaska between 1998 and 2002.

During this period, the range of Alaska harbor seals was divided into five survey regions and only one region was surveyed each year. This approach allowed observers to survey the entire coastline of each region, sometimes twice per year, to identify new harbor seal haul-out sites, and for individual haul-out sites to be surveyed multiple times in a given year, weather permitting. This intensive effort produced a lot of data for each region in a given year, but surveying the entire range to produce state-wide abundance and trend estimates required a period of 5 years.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date March 18, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date March 26, 2021
Reference Date(s) (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NMFS AFSC

Additional Metadata

Resource Type Dataset
Metadata Date March 18, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date March 26, 2021
Reference Date(s) (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:26740
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: Aerial Survey Counts of Harbor Seals in Coastal Alaska (1998-2002) [Data Date Range], https://www.fisheries.noaa.gov/inport/item/26740., Access Constraints: The data set is in the process of being archived with the NOAA National Centers for Environmental Information. Once the archival process is complete and verified, the data set will be publicly available. | Use Constraints: User must read and fully comprehend the metadata prior to use. Applications or inferences derived from the data should be carefully considered for accuracy. While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. Acknowledge NOAA/NMFS/AFSC or the specified citation as the source from which these data were obtained in any publications and/or other representations of these data. Communication and collaboration with dataset authors is strongly encouraged. | Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Bbox East Long -130
Bbox North Lat 61.5
Bbox South Lat 51
Bbox West Long 172
Coupled Resource
Frequency Of Update asNeeded
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[172.0, 51.0], [-130.0, 51.0], [-130.0, 61.5], [172.0, 61.5], [172.0, 51.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1998
Temporal Extent End 2002

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