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Reviewing scientists say proposed conservation measures unlikely to help whales

Ocean sanctuaries are unlikely to fully protect whales, say three independent scientists charged by the International Whaling Commission (IWC) with reviewing their sanctuary program to manage whale populations.

In a Policy Forum article forthcoming in the January 28 issue of the journal Science, Arizona State University marine biologist Leah Gerber, Duke University marine biologist K. David Hyrenbach, and University of Victoria geographer Mark Zacharias argue that the current sanctuary plan is not scientifically sound because it does not sufficiently consider the migratory behavior of most whale species, does not factor in threats to whales besides whaling, and would be difficult to evaluate once implemented.

"The scientific basis for the sanctuary program is not really valid," said Gerber.

"The sanctuaries are arbitrary in their boundaries because they were designed largely based on political considerations rather than by scientific criteria. Our analysis shows that the science-based harvesting plan known as the Revised Management Procedure (RMP) would be much more effective in encouraging growth of whale populations."

Models developed by the group show that the RMP would likely result in significant increases in whale populations over a hundred years, regardless of whale behavior. If whales are largely not migratory in their behavior, then the sanctuary plan would work as well or better, but if at least 50 percent of a given population migrates, then the sanctuary plan would be significantly less effective. If most whales are migratory, then virtually no growth would occur in whale populations under the sanctuary plan.

The sanctuaries designated by the IWC are four large areas in the South Atlantic, South Pacific, Indian and Southern Oceans. While the areas are large, the scientists believe that the whales that the sanctuaries are meant to protect also spend part of the year in areas where they would be vulnerable to capt
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Contact: James Hathaway
hathaway@asu.edu
480-965-6375
Arizona State University
28-Jan-2005


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