Counts of Alaska Steller sea lion pups conducted on rookeries in Alaska from 1961-06-22 to 2015-07-18 (NCEI Accession 0128189)

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.

本数据库收录了1961年至2015年阿拉斯加州境内各北海狮（Steller sea lion）繁殖栖地的幼崽计数数据。幼崽计数工作均于每年6月末至7月期间开展，计数方式涵盖地面徒步遍历繁殖栖地、悬崖俯瞰观测，以及采用倾斜与垂直拍摄的航空影像开展统计。通常将6月末至7月中旬开展的幼崽计数视为对应年度各栖地当年新生幼崽的全面普查。