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15-year analysis of blue whale range off California finds conflict with shipping lanes
Date:7/23/2014

NEWPORT, Ore. -- A comprehensive 15-year analysis of the movements of satellite-tagged blue whales off the West Coast of the United States found that their favored feeding areas are bisected by heavily used shipping lanes, increasing the threat of injury and mortality.

The researchers note that moving the shipping lanes off Los Angeles and San Francisco to slightly different areas at least, during summer and fall when blue whales are most abundant could significantly decrease the probability of ships striking the whales. A similar relocation of shipping lanes in the Bay of Fundy off eastern Canada lowered the likelihood of vessels striking endangered right whales an estimated 80 percent.

Results of the study which was supported by the Office of Naval Research, the National Geographic Society, the National Science Foundation, private gifts to the Oregon State University Marine Mammal Institute and others are being published this week in the journal PLOS ONE.

The analysis is the most comprehensive study of blue whales movements ever conducted. It was led by researchers at Oregon State University's Marine Mammal Institute, who tracked the movement of blue whales off the West Coast to identify important habitat areas and environmental correlates, and subsequently to understand the timing of their presence near major ports and shipping traffic.

"The main areas that attract blue whales are highly productive, strong upwelling zones that produce large amounts of krill which is pretty much all that they eat," said Ladd Irvine, a researcher with OSU's Marine Mammal Institute and lead author on the PLOS ONE study. "The whales have to maximize their food intake during the summer before they migrate south for the winter, typically starting in mid-October to mid-November."

"It appears that two of their main foraging areas are coincidentally crossed by shipping lanes," Irvine added.

In their study, the
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Contact: Bruce Mate
bruce.mate@oregonstate.edu
541-867-0202
Oregon State University
Source:Eurekalert  

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