"Putting some kind of noise deterrent on the ships isn't really an option, however," Mate added. "You don't really want to drive endangered whales out of their prime habitat and best feeding locations."
Moving the shipping lanes would not be unprecedented, the researchers note. Scientists brought concerns about right whale ship strikes in the Bay of Fundy to the International Maritime Organization, and the industry led the effort to modify shipping lanes in the North Atlantic more than a decade ago.
Daniel Palacios, also a co-author on the paper and a principal investigator with OSU's Marine Mammal Institute, said vessel traffic between Santa Barbara and Los Angeles moved south of its current location in the past to comply with the California Clear Air Act, but shifted back to its current location after getting an exemption to the legislation.
"It is not often that research results are so applicable to a policy decision." Palacios said, "It's not really our place to make management decisions, but we can inform policy-makers and in this case it is pretty straightforward. You will eliminate many of the ship strikes on blue whales by moving the shipping lanes south of the northern Channel Islands."
The solution for the San Francisco area is similar, the researchers note, though not quite as simple. Three separate shipping lanes are used in the region and all cross through the home range and core areas of blue whales tagged in this study.
"We did find that the northernmost shipping lanes crossed the area that was most heavily used by tagged whales," Irvine noted. "Restricting use of the northern lane during the summer and fall when more whales are present is one option; another would be to extend one lane further offshore before separating it into different trajectories, minimizing the overlap of the shipping lanes with the areas u
|Contact: Bruce Mate|
Oregon State University