Aerial and Ship-Based Surveys of Steller Sea Lions ('Eumetopias jubatus') inSoutheast Alaska, the Gulf of Alaska, and Aleutian Islands during June and July 1994

摘要

Aerial and ship-based surveys of Steller sea lions (Eumetopias jubatus) wereconducted during June and July 1994 from Forrester Island in Southeast Alaska to Attu Island in the western Aleutian Islands. A total of 32,945 adults and juvenile Steller sea lions were counted at 95 trend rookery and haulout sites. This represents decreases of 5.5% from 1992 counts (34,844) and 13.7% from 1990 (38,154). Annual rates of change, as estimated by linear regression, were -3.7% from 1990 to 1994 (P = 0.008). In 1994, 23,452 adult and juvenile sea lions were counted on trend rookery sites throughout Alaska. This represents a decrease of 14.9% from 1990 counts (27,563) and a 9.3% decrease from 1992 counts (25,849).