Decline of the Steller Sea Lion in Alaskan Waters is popular PDF and ePub book, written by National Research Council in 2003-05-04, it is a fantastic choice for those who relish reading online the Science genre. Let's immerse ourselves in this engaging Science book by exploring the summary and details provided below. Remember, Decline of the Steller Sea Lion in Alaskan Waters can be Read Online from any device for your convenience.
Decline of the Steller Sea Lion in Alaskan Waters Book PDF Summary
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.
Detail Book of Decline of the Steller Sea Lion in Alaskan Waters PDF
- Author : National Research Council
- Release : 04 May 2003
- Publisher : National Academies Press
- ISBN : 9780309086325
- Genre : Science
- Total Page : 217 pages
- Language : English
- PDF File Size : 21,7 Mb
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