The Daily Barometer, Tuesday, October 13, 2015

Page 1

VOL. CXVIII, No. 23

DailyBarometer.com

Tuesday, october 13, 2015 Oregon State University

Going in for the krill

contributed by Jeremy Goldbogen

Ari Friedlaender, associate professor of fisheries and wildlife at the Marine Mammal Institute, tags a blue whale off the the Oregon coast.

OSU researchers discover new details in blue whales’ hunting habits By Sean Bassinger Senior Beat Reporter

Contributed by Ari Friedlaender

Ari Friedlaender, associate professor of fisheries and wildlife at the Marine Mammal Institute, working in the field.

Blue whales are diving deep in retreaval of high-density krill populations and bypassing less filling options, according to a recent study. Based out of Hatfield Marine Science Center in Newport, Ari Friedlaender, a principle investigator and associate professor at Oregon State University’s Marine Mammal Institute and his colleagues study blue whales, their habitat and krillbased diet. In cooperation with the National Ocean and Atmospheric Administration (NOAA) and Stanford University, Friedlaender’s newest findings reveal how the whales feed in greater detail. Previously, it was thought that blue wales ate any time any krill were available. Highlighted in Tech Times and published in the journal Science Advances, the new research describes how the blue whale will target areas with more krill available to eat. If there are less available, the whales won’t dive down and instead conserve the energy and oxygen they would have otherwise used up. “What the data we’ve got shows is that the animals mediate their behavior,” Freidlaender said. Freidlaender and his associates collect the data with multi-

IN THIS ISSUE >>>

sensor recording tags attached to new whales. An echo sounder is then used to calculate depth, location and density of the food available. “From that we can infer where the animals are feeding,” he said. Since the animals migrate often, energy conservation remains essential. Daniel Palacios, an assistant professor at the Marine Mammal Institute who specializes in marine habitats, said more dense populations of krill tend to appear along areas in the west coast. “Sometimes the ocean floor can be very rugged or there are underwater canyons or island,” Palacios said. “That tends to stir up nutrients more. The whales go to target those areas.” Palacios described common blue whale feeding habits as an equivalent to wholesale bulk grocery store purchases. The whales are known to stock up on nutrients needed over time. “They need to have large amounts and large concentrations,” Palacios said. Bruce Mate, director at the Marine Mammal Institute, said some of the blue whales they’ve tagged have travelled thousands of kilometers since July. “There are some blue whales that have already, since early July, travelled four, five, or six thousand kilometers,” Mate said.

Blue whales tend to weigh between 60 and 80 tons, according to Mate. “These are some of the largest animals in the world,” he said. “There’s nothing for them to eat in Hawaii, so they’re fasting the whole time they migrate.” Part of the Marine Mammal Institutes whale tagging research, which Mate has helped pioneer, is a continuing effort to help conserve existing populations and minimize human impact on their environments. Blue whales are an endangered species primarily because of unnatural occurrences that take place within their environment. “They’re only endangered because of commercial whaling and other human activities,” Friedlaender said. Hunting has been one of the greatest impacts, with the number of blue whales in the Antarctic region alone going from 336,000 in the early 1900s to less than 2,000 today, Mate added. “We aren’t even back up to anything close that we could call recovered,” Mate said. Mate and other researchers work to find solutions to reduce human activity in areas populated by the whales. Additional information on programs and studies from the Marine Mammal Institute can be found at mmi.oregonstate.edu. news@dailybarometer.com

Police beat, NEWS, PAGE 2 Caleb Saulo does it right, SPORTS, PAGE 4 Vegan cooking, A&E, PAGE 8


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.
The Daily Barometer, Tuesday, October 13, 2015 by The Daily Barometer - Issuu