Northern Sea Lion Distribution and Abundance: 1956-80
Loughlin TR, Rugh DJ, Ficus CH. 1984. Northern Sea Lion Distribution and Abundance: 1956-80. The Journal of Wildlife Management. 48(3):729-740
The present distribution and abundance of the northern sea lion (Eumetopias jubatus) was determined from surveys made between 1975 and 1980 and compared to estimates made approximately 20 years earlier. The previous population estimate of 240,000-300,000 is similar to our estimate of 245,000-290,000. Declines appear to have occurred in the eastern Aleutian Islands, Pribilof Islands, and near Kodiak Island in the Gulf of Alaska. Increases may have occurred principally in the western and central Aleutians and west of Kodiak Island. Seasonal movements and indirect and direct effects by humans are considered the likely causes for regional changes in distribution and abundance.
- Type
- Journal Article
- Authors
- Loughlin, Thomas; Rugh, David; Ficus, Clifford
- Units
- GLBA , SEAN
- Keywords
- Abundance, Distribution, Marine Mammal, Pinniped