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) ...

• Main Authors: Fritz, Lowell, Sweeney, Kathryn, Lynn, Morgan, Gelatt, Thomas, Gilpatrick, James, Towell, Rodney
• Format: Dataset
• Language: unknown
• Published: NOAA National Centers for Environmental Information 2015
• Subjects: Bering Sea; Alaska; Aleutian Islands
• Online Access: https://dx.doi.org/10.7289/v54f1np1; https://www.ncei.noaa.gov/archive/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. ...