Counts of Alaska Steller sea lion adult and juvenile (non-pup) conducted on rookeries and haul-outs in Alaska Aleutian Islands, Bering Sea, and others from 1904-01-01 to 2015-07-18 (NCEI Accession 0128190)
This dataset contains counts of adult and juvenile (non-pup) Steller sea lions on rookeries and haul-outs in Alaska made between 1904 and 2015. Non-pup counts have been conducted throughout the year. Breeding season (June-mid July) non-pup counts are used for population trend analysis, while counts at other times are used for analyses of distribution and for other purposes. Non-pups are counted from the ground (by walking along the rookery), from cliff-side overlooks, and from aerial imagery (oblique and vertical orientation). Non-pup counts represent only a fraction of the total number of animals that may use a site. Sea lions haulout less frequently in winter than in summer; thus, winter counts represent a smaller fraction of the total population than summer counts.
Dataset Citation
- Cite as: Fritz, Lowell; Sweeney, Kathryn; Lynn, Morgan; Gelatt, Thomas; Gilpatrick, James; Towell, Rodney (2015). Counts of Alaska Steller sea lion adult and juvenile (non-pup) conducted on rookeries and haul-outs in Alaska Aleutian Islands, Bering Sea, and others from 1904-01-01 to 2015-07-18 (NCEI Accession 0128190). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v54f1np1. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0128190
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 1904-01-01 to 2015-07-18 |
Spatial Bounding Box Coordinates |
West: 172
East: -131
South: 52
North: 63
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-251.pdf http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-321.pdf The file "SSLnonpupcounts2016.csv" contains counts from Alaska of non-pup (adult and juvenile) Steller sea lions in the NMML database. The counts were made between 1904 and 2015. This file includes counts obtained during breeding season aerial surveys, as well as counts obtained during winter aerial surveys, boat surveys, cliff counts, and other miscellaneous counts. The non-pup count data file (SSLnonpupcounts2016.csv) is in ASCII text format and fields are comma-delimited (.csv). It contains the following fields: SITENAME REGIONNUMB: 4 = British Columbia, Canada 5 = Southeast Alaska, 6 = Eastern Gulf of Alaska 7 = Central Gulf of Alaska 8 = Western Gulf of Alaska 9 = Eastern Aleutian Islands 10 = Central Aleutian Islands 11 = Western Aleutian Islands 12 = Bering Sea TRENDSITE 0 - not a trend site, 1 - is a trend site ROOKERY 0 - not a rookery, 1 - is a rookery, 2 - special case, rookery but not a trend rookery. MONTH 1-12, 99 is unknown/missing DAY 1-31, 99 is unknown/missing YEAR COUNT: (Does not include newborn pups during the breeding season) COUNTTYPE: 1 = aerial photo (35mm) oblique 2 = medium-format (5 inch) vertical aerial photo 3 = aerial photo (digital) vertical 4 = aerial, visual estimate 5 = beach/ground count 6 = viewpoint observations 7 = count from skiff nearshore 8 = count from ship offshore 9 = other (explain in comments) 10 = UAV 99 = unknown or not specified SOURCE: 1 = NMFS/National Marine Mammal Laboratory 2 = Alaska Department of Fish and Game 3 = Oregon Department of Fish and Wildlife 4 = Washington Department of Fish and Wildlife 5 = NMFS/Southwest Fisheries Science Center 6 = Canada Department of Fisheries and Oceans 7 = other (explain in comments) 99 = unknown or not specified REPLICATE: R if replicate count (different day) during same survey, N otherwise. If there are replicate counts for a site, all counts for that site are marked R. There are multiple counts at the same site with the same date. These are the raw counts of more than one counter using aerial photos, and in these cases, the replicate field is marked N. COUNTER: initials of counter (photo, slide, from skiff etc...) COMMENTS: (Clarification of COUNTTYPE, SOURCE, or COUNT as necessary) In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. |
Purpose | Counts of Steller sea lions pups, adults, and juveniles are used to monitor trends in the population and used in the development of population models. |
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Data Center keywords | NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords |
Platform keywords | NODC PLATFORM NAMES THESAURUS |
Instrument keywords | NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords |
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Project keywords | NODC PROJECT NAMES THESAURUS |
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Last Modified: 2024-06-10T12:38:40Z
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For questions about the information on this page, please email: ncei.info@noaa.gov