Author: M.A. PASCUALPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The decline of the Steller sea lion in the northeast Pacific
Author: M.A. PASCUALDecline 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.
Correlates of the Decline of the Steller Sea Lion in the North Pacific
Author: Hans NessePublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 128
Book Description
Steller Sea Lion Decline
Author: Douglas P. DeMasterPublisher:
ISBN:
Category : Nature
Languages : en
Pages : 86
Book Description
The most likely cause of the moderate decline of western Alaska Steller sea lions, in the 1990s, is poor recruitment (reproduction and survival of young). Also implicated are nutritional stress, predation, and disease. In contrast, nutritional stress alone was the leading hypothesis for a steep decline in sea lions the 1980s. This book has 13 extended abstracts presented at a May 2001 workshop. Attendees included the nation's leading authorities on Alaska's Steller sea lions.
Recovery Plan for the Steller Sea Lion (Eumetopias Jubatus)
Author: Steller Sea Lion and Northern Fur Seal Research
Author: Steller Sea Lion Research
Author: I. L. BoydPublisher:
ISBN:
Category : Steller's sea lion
Languages : en
Pages : 186
Book Description
The Relationship of the Foraging Ecology of Steller Sea Lions (Eumetopias Jubatus) to Their Population Decline in Alaska
Author: Richard MerrickPublisher:
ISBN:
Category : Marine mammal populations
Languages : en
Pages : 438
Book Description
Steller Sea Lion and Northern Fur Seal Research: Purpose and need; Alternatives; Affected environment; Environmental consequences; National Environmental Policy Act compliance implementation and recommendations; List of preparers; List of agencies, organizations, and persons whom the draft EIS was sent; References; Index
Author: United States. National Marine Fisheries Service. Office of Protected Resources. Permits DivisionPublisher:
ISBN:
Category : Northern fur seal
Languages : en
Pages : 1124
Book Description