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    • Alaska Steller Sea Lion Pup Count Database

    Metadata Updated: June 1, 2025

    This database contains counts of Steller sea lion pups on rookeries in Alaska made between 1961 and 2019. Pup counts are conducted in June-July. Pups are counted from the ground (by walking along the rookery), from cliff-side overlooks, and from aerial images (vertical orientation). Pup counts conducted in late June-mid July are considered to represent a complete census of pups produced at each site during the year.

    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 May 15, 2025
    Metadata Created Date October 28, 2022
    Metadata Updated Date June 1, 2025
    Reference Date(s) April 23, 2015 (creation), June 9, 2021 (revision), 2021 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NMFS AFSC

    Other Data Resources

    Graphic Preview

    Graphic Preview

    Additional Metadata

    Resource Type Dataset
    Metadata Date May 15, 2025
    Metadata Created Date October 28, 2022
    Metadata Updated Date June 1, 2025
    Reference Date(s) April 23, 2015 (creation), June 9, 2021 (revision), 2021 (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:24573
    Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: Alaska Steller Sea Lion Pup Count Database [Data Date Range], https://www.fisheries.noaa.gov/inport/item/24573., Access Constraints: There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed., 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. Data must be cited as directed. Communication and collaboration with data set authors is strongly encouraged., Distribution Liability: 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.
    Bbox East Long -131
    Bbox North Lat 63
    Bbox South Lat 51
    Bbox West Long 172
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview File https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0128189
    Harvest Object Id a0b82b06-7112-455b-bb40-afe300069c56
    Harvest Source Id 26a29bb9-50b0-47fd-920b-edc74aa6ec76
    Harvest Source Title NMFS AFSC
    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.
    Lineage The Marine Mammal Laboratory (MML) conducted aerial surveys to photograph and count Steller sea lion (Eumetopias jubatus) pups (~1 month old) on known terrestrial rookery and haulout sites in Alaska in June-July 2019 (Sweeney et al. 2019). On odd years, MML focuses their survey effort on the Gulf of Alaska (southeast Alaska towards the western Gulf of Alaska) portion of the Steller sea lion range in Alaska. The occupied aircraft survey team conducted their survey from 24 June to 4 July from southeast Alaska (Dixon Entrance, 132°W) through the western Gulf of Alaska (Sanak Islands, 163°W). On even years, MML focuses their survey effort in the Aleutian Islands (from the western through the eastern Aleutian Islands regions), and sometimes into the western Gulf of Alaska region if not surveyed the previous year. The ship-based survey team on board the R/V Tiĝlâx did not conduct visual counts or collect aerial imagery using an unoccupied aircraft system (UAS or drone) during the cruise from 20 June to 2 July. The survey team did travel the Aleutian Islands between Adak Island (176°W) and Attu Island (172°E) focusing on other research priorities. No surveys were conducted in 2020 due to global COVID-19 pandemic. For surveys back to 2008, see discussions in Fritz et al. (2013), Fritz et al. (2016), Sweeney et al. (2016), Sweeney et al. (2017), and Sweeney et al. (2018).
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[172.0, 51.0], [-131.0, 51.0], [-131.0, 63.0], [172.0, 63.0], [172.0, 51.0]]]}
    Progress underDevelopment
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1961

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