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

researchers attached transmitters to 171 blue whales off California at different times between 1993 and 2008 and tracked their movements via satellite. Their study looked at seasonal as well as individual differences in whale distribution, documenting a high degree of variability but also a strong fidelity to the upwelling zones that coincide with ship traffic to and from the major ports of Los Angeles and San Francisco.

Blue whales can grow to the length of a basketball court, weigh as much as 25 large elephants combined, and their mouths could hold 100 people, though their diet is primarily krill tiny shrimp-like creatures less than two inches in length. The blue whale is the largest creature to ever inhabit the Earth, yet little was known about their range or where they went to breed until Oregon State's Bruce Mate led a series of tracking studies featured in the popular 2009 National Geographic documentary, "Kingdom of the Blue Whale."

An estimated 2,500 of the world's 10,000 blue whales spend time in the waters off the West Coast of the Americas and are known as the eastern North Pacific population. The huge whales can travel from the Gulf of Alaska all the way down to an area near the equator known as the Costa Rica Dome.

The majority of the population spends the summer and fall in the waters off the U.S. West Coast, with the areas most heavily used by the tagged whales occurring off California's Santa Barbara and San Francisco, which puts them in constant peril from ship strikes.

"During one year, while we were filming the documentary, five blue whales were hit off of southern California during a seven-week period," said Mate, who directs the Marine Mammal Institute at OSU's Hatfield Marine Science Center in Newport, Ore. "Blue whales may not be as acoustically aware as species that rely on echolocation to find prey and there is some evidence that the location of the engines in the rear of the ship creates something of a
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Contact: Bruce Mate
bruce.mate@oregonstate.edu
541-867-0202
Oregon State University
Source:Eurekalert  

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15-year analysis of blue whale range off California finds conflict with shipping lanes
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