Author: Publisher:
ISBN:
Category : Rare mammals
Languages : en
Pages : 108
Book Description
Recovery Plan for the Steller Sea Lion (Eumetopias Jubatus)
Author: Aerial and Land-based Surveys of Steller Sea Lions (Eumetopias Jubatus) in Alaska, June and July 1999 and 2000
Author: John L. SeasePublisher:
ISBN:
Category : Mammal populations
Languages : en
Pages : 130
Book Description
Steller Sea Lions (Eumetopias Jubatus)
Author: Andrew W. TritesPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 52
Book Description
Presents the changes in the Steller sea lion's diet over time (from a diverse diet including fatty fishes to one dominated by pollock), which has resulted in negative reproductive and survival consequences
Species Account
Author: Donald Gary CalkinsPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 12
Book Description
A report on Steller sea lions living in the North Pacific Ocean off of the coast of Alaska.
Status of the Steller Sea Lion (Eumetopias Jubatus) and California Sea Lion (Zalophus Californianus) in British Columbia
Author: Michael A. BiggPublisher: Fisheries and Oceans, Scientific Information and Publications Branch
ISBN:
Category : California sea lion
Languages : en
Pages : 32
Book Description
Aerial censuses were undertaken for Steller sea lions (Eumetopias jubatus) and California sea lions (Zalophus californianus) during 1971-84, and a review was made of published and unpublished data on numbers seen and numbers killed since 1913. These data were used to describe the location of haulout sites, season of occupation at haulout sites, regional movement patterns, and trends in numbers seen for each species during this century.
Present Abundance of Steller Sea Lions (Eumetopias Jubatus) in the U.S.S.R.
Author: A. S. PerlovPublisher:
ISBN:
Category : Eared seals
Languages : en
Pages : 34
Book Description
Steller Sea Lion Research
Author: I. L. BoydPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 186
Book Description
Winter Ecology of Steller Sea Lions (Eumetopias Jubatus) in Alaska
Author: Boyd PorterPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 106
Book Description
Population Dynamics of Steller Sea Lions, Eumetopias Jubatus, in the Eastern Gulf of Alaska
Author: John Michael ManiscalcoPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 268
Book Description
Steller sea lions (Eumetopias jubatus) were listed as endangered following a collapse of the western population beginning in the late 1970s. Low juvenile survival and reduced reproductive rates (natality) have been implicated as important factors in the decline. I conducted separate mark-recapture analyses to estimate juvenile survival and natality in an area of the western population where Steller sea lions have begun to show signs of recovery since the early 2000s. I then used these vital-rate estimates in a population matrix to estimate the strength of the recovery and assess which rates pose the greatest threats to recovery. First year survival was estimated at 80% for both males and females, but second-year survival dropped to a low of 40.6% for males and 64.2 % for females that were weaned at age 1. In contrast, survival was greatly improved (88.2%) for males and females that continued to suckle between ages 1 and 2. Cumulative survival to age 4 was double (35.7%) that estimated during the population decline. Natality was also higher in recent years (70%) than during the height of the decline in the 1980s (55%). The mean rate of population growth, based on matrix modeling of vital rates estimated in this study, was 4.1% per year between 2003 and 2013. By projecting these trends into the future, I estimated that the population in the study area may be fully recovered within 14 years, if density independent growth is to be expected in the near future. If density dependent factors come into play, the population will need another 37 years to fully recover. As would be expected from a long-lived, K-selected species, population growth rate was most sensitive to variation in adult survival, less sensitive to juvenile survival, and least sensitivity to natality. The findings of this study have important implications for Steller sea lion population management and suggest research priorities should be shifted from an emphasis on natality to an emphasis on survival rates and causes of mortality.
Aerial and Ship-based Surveys of Steller Sea Lions (Eumetopias Jubatus) in Southeast Alaska, the Gulf of Alaska, and Aleutian Islands During June and July 1991
Author: Richard L. MerrickPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 62
Book Description