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OAS accession Detail for 0128189, meta_version: 32. Current meta_version is: 37
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| accessions_id: | 0128189 | archive |
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| Title: | Counts of Steller sea lion pups collected from terrestrial, aerial, ship, and unoccupied aircraft surveys of rookeries and major haulouts in Alaska during the Steller sea lion aerial survey project from 1961-06-22 to 2019-07-04 (NCEI Accession 0128189) |
| Abstract: | As part of the Steller sea lion research project, the Alaska Fisheries Science Center (AFSC) conducted surveys of Steller sea lions in Alaska from 1961-06-22 to 2019-07-04. This dataset contains counts of Steller sea lion pups on rookery and haulout sites collected by observers from terrestrial, aerial, ship, and unoccupied aircraft surveys. Pups were counted from the ground (by walking along the rookery), from cliff-side overlooks, from near-shore vessels, and from aerial images. Pup counts conducted in late June-mid July are considered to represent a complete census of pups produced at each site during the year. |
| Date received: | 20210630 |
| Start date: | 19610622 |
| End date: | 20190704 |
| Seanames: | Bering Sea, Coastal Waters of Southeast Alaska and British Columbia, Gulf of Alaska, North Pacific Ocean |
| West boundary: | 172 |
| East boundary: | -131 |
| North boundary: | 63 |
| South boundary: | 51 |
| Observation types: | aerial photography, biological, in situ, marine mammal observation, survey - biological, visual estimate, visual observation |
| Instrument types: | camera, deprecated, photograph, visual observation |
| Datatypes: | ANIMALS - INDIVIDUAL - COUNTS, biological data, MARINE MAMMALS, VERTEBRATES |
| Submitter: | Fadely, Brian |
| Submitting institution: | US DOC; NOAA; NMFS; Alaska Fisheries Science Center; Marine Mammal Laboratory |
| Collecting institutions: | Alaska State Department of Fish and Game, US DOC; NOAA; NMFS; Alaska Fisheries Science Center; Marine Mammal Laboratory, US DOC; NOAA; NMFS; Southwest Fisheries Science Center, Washington State Department of Fish and Wildlife |
| Contributing projects: | STELLER SEA LION RESEARCH |
| Platforms: | AIRCRAFT (3191), SMALL BOAT (90UY), Tiglax (33A0), |
| Number of observations: | |
| Supplementary information: | In this Accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. STELLER SEA LION PUP COUNT DATABASE Last Updated: August, 2021 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 https://media.fisheries.noaa.gov/dam-migration/ssl_aerial_survey_2019_final_508.pdf STELLER SEA LION PUP COUNT DATABASE Last Updated: June 9, 2021 The file SSLpupcounts2019.csv contains counts of Steller sea lion pups on rookeries and major haulouts in Alaska from the NMML data base. The counts were made between 1961 and 2019. The pup count data file (SSLpupcounts2019.csv) is in ASCII text format and fields are comma delimited (.csv). It contains the following fields: SITENAME REGIONNUMB: 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 PUPCOUNT (live pups only, does not include pups dead at time of count) COUNTTYPE: 1 = aerial photo (35mm) 2 = medium-format (5 inch) aerial photo 3 = aerial photo (digital) 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 photos 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 the same survey, N otherwise. If there are replicate counts for a site, all counts for that site are marked R. Beginning in 2010, 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. Note that starting in 2002, individual countertype counts during beach/ground counts are listed in the Comments, and again Replicate is "N". COUNTER: initials of counter (photo) started in 2010) COMMENTS: (Clarification of COUNTTYPE, SOURCE, or COUNT as necessary); Data Quality Information: There are several issues with the data that users need to be aware of before using this database. 1. This database is continually being updated and modified. Users should check for the date the database was last modified. 2. This data set includes counts from all times year, some of which may not be appropriate for particular analyses. The number of sea lions at a given site is extremely seasonally dependent. Comparison of counts from November in one year and from July in another year is likely to produce confounded results. Population trend analyses typically are performed using data only from the breeding season June and July. 3. The most precise counts, and thus the counts preferred for population trend analyses, are aerial survey counts made from photographs. Counts made from skiffs or ships may be very accurate for small numbers of sea lions but imprecise for large groups. Visual estimates made from the air are best used as qualitative not quantitative data. 4. This data table includes counts of Steller sea lion pups, made during the breeding season (June and July) unless month unknown. 5. A zero in the pupcount field means the site was surveyed and no sea lions were present. If a site was not surveyed in a given year it is not included in the database; there are no records with the pupcount field blank. 6. Throughout the database "99" indicates that a day, month, platform, or source is unknown. 7. There are blanks in the comment field. This may cause problems when end users import the ASCII text file into their preferred software format. 8. Site names are not consistent throughout the database. Surveys prior to 1990 frequently combined separate haul-out sites on an island into a single count, whereas more recent surveys usually list sites separately (e.g., Agattu versus Agattu/Cape Sabak and Agattu/Gillon Point). Also, the NMML continues to refine the definition of individual sites and occasionally adds new sites. Background Information: 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). |
| Availability date: | |
| Metadata version: | 32 |
| Keydate: | 2015-05-20 21:35:04+00 |
| Editdate: | 2022-01-21 19:33:30+00 |