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portada Decline of the Steller Sea Lion in Alaskan Waters. Untangling Food Webs and Fishing Nets
Type
Physical Book
Publisher
Author
Year
2003
Language
English
Pages
216
Format
Paperback
Dimensions
9x6 cm
ISBN13
9780309086325

Decline of the Steller Sea Lion in Alaskan Waters. Untangling Food Webs and Fishing Nets

National Research Council;Division On Earth And Life Studies;Polar Research Board;Ocean Studies Board;Committee On The Alaska Groundfish Fishery And Steller Sea Lions (Author) · National Academies Press · Paperback

Decline of the Steller Sea Lion in Alaskan Waters. Untangling Food Webs and Fishing Nets - National Research Council;Division on Earth and Life Studies;Polar Research Board;Ocean Studies Board;Committee on the Alaska Groundfish Fishery and Steller Sea Lions

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Synopsis "Decline of the Steller Sea Lion in Alaskan Waters. Untangling Food Webs and Fishing Nets"

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.

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