Science & Data

This dataset contains counts of adult and juvenile (non-pup) Steller sea lions on rookeries and haulouts in Alaska Aleutian Islands, Bering Sea, and other areas made between that beginning of 1904 and June 18, 2015.

This database contains counts of Steller sea lion pups in Alaska between June 22, 1961 and July 4, 2019. Pup counts are conducted from the ground (by walking along the rookery), cliff-side overlooks, and aerial images (oblique and vertical orientation).

Spacial data and maps of critical habitat and Endangered Species Act (ESA) threatened and endangered marine mammals under NOAA Fisheries jurisdiction in Alaska.

The Marine Mammal Laboratory (MML) conducted aerial, ship, and land-based surveys to count Steller sea lion (Eumetopias jubatus) pups and non-pups on terrestrial rookery and haulout sites in Alaska in June to July 2017.

Aerial, ship, and land-based surveys to count Steller sea lion (Eumetopias jubatus) pups and non-pups on terrestrial rookery and haul-out sites in Alaska were conducted by the Marine Mammal Laboratory (MML) in June to July 2016.

This dataset contains site names with corresponding geographic coordinates of 472 consistently-used and known Steller sea lion haul sites.

This file contains counts from the Alaska Fisheries Science Center's Marine Mammal Laboratory database of Steller sea lion pups on rookeries in Alaska.

This database contains counts of adult and juvenile (non-pup) Steller sea lions on rookeries and haulouts 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.

This database contains counts of Steller sea lion pups on rookeries in Alaska made between 1961 and 2015. Pup counts are conducted in late June-July. Pups are counted from the ground (by walking along the rookery), from cliff-side overlooks, and from aerial images (oblique and 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.

Aerial, ship, and land-based surveys to count Steller sea lion (Eumetopias jubatus) adults, juveniles, and pups on terrestrial rookery and haulout sites in Alaska were conducted by the Marine Mammal Laboratory (MML) in June to July 2015.