Assessment of Net Entanglement on Northern Sea Lions in the Aleutian Islands, 25 June-15 July 1985 PDF Download
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Author:
Publisher:
ISBN:
Category : Sea lions
Languages : en
Pages : 66
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Author:
Publisher:
ISBN:
Category : Sea lions
Languages : en
Pages : 66
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Author:
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ISBN:
Category :
Languages : en
Pages : 518
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Author:
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ISBN:
Category : Rare mammals
Languages : en
Pages : 108
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Author:
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ISBN:
Category :
Languages : en
Pages : 536
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Author:
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Category : Electronic journals
Languages : en
Pages : 620
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Author:
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ISBN:
Category : Fishery management
Languages : en
Pages : 186
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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309086329
Category : Science
Languages : en
Pages : 217
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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.
Author: United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Coast Guard and Navigation
Publisher:
ISBN:
Category : Marine pollution
Languages : en
Pages : 216
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Author: Thomas R. Loughlin
Publisher:
ISBN:
Category : Sea lions
Languages : en
Pages : 60
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 1314
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