Humpback whales are known for the complexity¹ of their feeding techniques, which include "trapping" krill and other prey² within bubble nets they produce and gulping³（狼吞虎咽地吃） up to two-thirds their weight in prey-laden water. Now, scientists have confirmed that humpback whales in the southern Gulf⁴ of Maine are spending more feeding time on the ocean floor than in any of these other feeding behaviors. Because entanglement⁵ in fishing gear is a major risk to humpbacks, these findings have implications on bottom-set gear like those used in lobster⁶ traps. "Humpbacks have not been known as bottom-feeders, yet this is their dominant⁷ feeding mode in this region," says University of New Hampshire professor of data visualization⁸ Colin Ware⁹, lead author of a paper published in the journal Marine¹⁰ Mammal Science. "You've got this prominent species, and until now nobody knew how they were doing most of their feeding."

 

Ware, of UNH's Center for Coastal¹¹ and Ocean Mapping, and his collaborators, including David Wiley of the Stellwagen Bank National Marine Sanctuary¹² of the National Oceanic and Atmospheric¹³ Administration (NOAA) and Ari Friedlaender of Duke University Marine Laboratory and Pratt School of Engineering, gathered data from 52 humpback whales in the Stellwagen Bank National Marine Sanctuary and the Great South Channel near Cape¹⁴ Cod¹⁵, Mass.

 

By affixing¹⁶ DTAGs -- synchronous¹⁷ motion and acoustic¹⁸ recording¹⁹ tags -- to the whales' backs via four suction cups（吸杯，吸盘）, the researchers could track for the first time the movements of the whales below the ocean's surface. TrackPlot, a custom software tool developed by Ware, translated the tags' data into a three-dimensional ribbon that illustrated²⁰ the whales' paths as they repeatedly dove to the bottom of the ocean, rolled onto their sides, tilted²¹ their heads down, and feasted on sand lance, a favorite food that is abundant there.

 

From this data, collected between 2004 and 2009, Ware and his collaborators identified three distinct types of behavior during what they call bottom side-roll feeding: simple side-rolls, side-roll inversions²², and repetitive scooping²³. The tag data confirms the bottom-feeding that scientists had suspected from visible scarring along some whales' jaws²⁴.

 

Not only did the data show that these humpbacks, "by far the most acrobatic of all baleen²⁵ whales," Ware says, were performing bottom side-rolls and seafloor scooping, it indicates that this bottom feeding does not include lunging, previously²⁶ assumed to be the humpbacks' primary feeding behavior.

 

In lunge feeding, whales accelerates to propel water full of prey into their enlarged mouths; they then filter the water out through the hair-like filaments²⁷ of their baleens（鲸须） and retain the prey. Tag data showed that the bottom-feeding humpbacks were moving at too low a speed to characterize this behavior as lunge feeding.

 

While a Crittercam™ -- a National Geographic²⁸ Society video camera that gives a whale's-eye view -- attached to a humpback provides additional insight into the whales' time at the seafloor, Ware cautions that there's plenty to learn about what the whales are doing in the deep.

 

"The big mystery is we still don't know exactly how they're feeding. We don't know the mechanism," he says.

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