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)

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.

作为斯特勒海狮（Steller sea lion）研究项目的组成部分，阿拉斯加渔业科学中心（Alaska Fisheries Science Center, AFSC）于1961年6月22日至2019年7月4日期间，在阿拉斯加州开展了斯特勒海狮调查。本数据集收录了观测人员通过地面、航空、船舶及无人驾驶航空器调查，在繁殖栖息群地（rookery）与临时停靠点（haulout site）采集的斯特勒海狮幼崽计数数据。幼崽计数可通过沿繁殖栖息群地步行、悬崖俯瞰、近岸船舶观测及航空影像判读四种方式完成。6月下旬至7月中旬开展的幼崽计数工作，被认为可代表当年各站点所产幼崽的完整普查数据。