Author: Morgen CrowPublisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 124
Book Description
A Review of Proposed Fishery Management Actions and the Decline of Steller Sea Lions Eumetopias Jubatus in Alaska
Author: Morgen CrowPublisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 124
Book Description
Decline of the Steller Sea Lion in Alaskan Waters
Author: National Research CouncilPublisher: National Academies Press
ISBN: 0309086329
Category : Science
Languages : en
Pages : 217
Book Description
For an unknown reason, the Steller sea lion population in Alaska has declined by 80% over the past three decades. In 2001, the National Research Council began a study to assess the many hypotheses proposed to explain the sea lion decline including insufficient food due to fishing or the late 1970s climate/regime shift, a disease epidemic, pollution, illegal shooting, subsistence harvest, and predation by killer whales or sharks. The report's analysis indicates that the population decline cannot be explained only by a decreased availability of food; hence other factors, such as predation and illegal shooting, deserve further study. The report recommends a management strategy that could help determine the impact of fisheries on sea lion survival-establishing open and closed fishing areas around sea lion rookeries. This strategy would allow researchers to study sea lions in relatively controlled, contrasting environments. Experimental area closures will help fill some short-term data gaps, but long-term monitoring will be required to understand why sea lions are at a fraction of their former abundance.
Decline of the Steller Sea Lion in Alaskan Waters
Author: National Research CouncilPublisher: National Academies Press
ISBN: 0309168724
Category : Science
Languages : en
Pages : 216
Book Description
For an unknown reason, the Steller sea lion population in Alaska has declined by 80% over the past three decades. In 2001, the National Research Council began a study to assess the many hypotheses proposed to explain the sea lion decline including insufficient food due to fishing or the late 1970s climate/regime shift, a disease epidemic, pollution, illegal shooting, subsistence harvest, and predation by killer whales or sharks. The report's analysis indicates that the population decline cannot be explained only by a decreased availability of food; hence other factors, such as predation and illegal shooting, deserve further study. The report recommends a management strategy that could help determine the impact of fisheries on sea lion survival-establishing open and closed fishing areas around sea lion rookeries. This strategy would allow researchers to study sea lions in relatively controlled, contrasting environments. Experimental area closures will help fill some short-term data gaps, but long-term monitoring will be required to understand why sea lions are at a fraction of their former abundance.
Marine Fisheries Review
Author: Steller Sea Lion Protection Measures
Author: Final recovery plan for the steller sea lion (Eumetopias jubatus)
Author: Potential Interactions Between State-managed Fisheries and Steller Sea Lions (Eumetopias Jubatus)
Author: Nathan James SoboleffPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 248
Book Description
"Are spatial and temporal patterns of Steller sea lion declines consistent with development of certain state-managed commercial fisheries and vessel activity? This question motivated our analysis of data from the National Marine Fisheries Service count database and the Alaska Department of Fish and Game's (ADF & G) Fish Ticket database on state managed commercial fisheries from 1976 to 2002. Rookery groupings for Steller sea lions were formed based on spatial patterns of covariation of similar population declines. Using query reports from ADF & G, commercial fisheries statistical areas were selected within 50-nm radii of rookery groupings and analyzed for potential fisheries interactions. Negative correlations between state-managed fisheries for groundfish and salmon fisheries were found but few were statistically significant. Low statistical power constrained some of these tests. Many state-managed fisheries for shellfish (shrimp, king, and Tanner crab) were positively correlated with Steller sea lion declines, but again few were statistically significant. Rather than suggesting that somehow sea lions benefit from these fisheries, positive correlations are more likely to be indicative of covariation of sea lions and fisheries with common environmental factors. Field research into groundfish and salmon fisheries interactions, perhaps coupled with experimental management, is necessary to confirm causes of Steller sea lion declines"--Leaf iii.
Steller Sea Lion Protection Measures
Author: Programmatic Supplemental EIS for Alaska Groundfish Fisheries Implemented Under the Authority of the Fishery Management Plans for the Groundfish Fishery of the Gulf of Alaska and the Groundfish of the Bering Sea and Aleutian Islands Area
Author: Draft Environmental Impact Statement
Author: United States. Bureau of Land Management. Alaska State OfficePublisher:
ISBN:
Category : Alaska
Languages : en
Pages : 438
Book Description