Aerial and ship-based surveys of northern sea lions (Eumetopias jubatus) in the Gulf of Alaska and Aleutian Islands during June and July 1990
Merrick RL, Ferm LM, Everitt RD, Ream RR, Lessard LA. 1991. Aerial and ship-based surveys of northern sea lions (Eumetopias jubatus) in the Gulf of Alaska and Aleutian Islands during June and July 1990. NOAA Technical Memorandum. US National Marine Fisheries Service. Alaska Fisheries Science Center. Seattle, WA
(Adapted from authors' abstract.) Aerial and ship-based surveys of northern sea lions conducted during June and July 1990 from the Kenai Peninsula to Kiska Island reconfirm findings of the 1989 survey that the area's population has declined significantly since 1956. Declines occurred at all regions and sites during the 1956-89 period. The total number of sea lions counted in the Kenai to Kiska study area, however, did not change significantly between 1989 and 1990. Adults and juveniles counted at 77 trend sites decreased from 105,289 in 1956-59 to 55,824 in 1985 and then to 23,064 and 22,754 in 1989 and 1990, respectively. Numbers of live pups counted at 19 major rookeries located from Chirikof Island to Kiska Island decreased from 21,391 in 1985 to 6,871 in 1990. At the only three rookeries counted in 1989, pup numbers increased by 29% between 1989 and 1990 at Bogoslof and Seguam Islands, while decreasing by 25% at Kiska Island.
- Type
- Published Report
- Authors
- Merrick, R; Ferm, L; Everitt, R; Ream, R; Lessard, L
- Date of Issue
- 1991
- Publisher
- US National Marine Fisheries Service. Alaska Fisheries Science Center
- Units
- KATM , KEFJ
- Keywords
- Alaska Peninsula, Aleutian Islands, Animal Studies, Aquatic Studies, Eumetopias jubatus, Gulf Of Alaska, Katmai National Park And Preserve, Kenai Fjords National Park, Kenai Peninsula, Mammalia (Mammals), Marine Mammals, Marine Studies, Northern sea lions, Population, Population Trends, Surveys