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UBC researcher reveals humpback whales' dining habits -- and costs
Date:11/26/2008

3 dives and 362 lunges while the other executed 15 dives and 89 lunges.

The team found that lunge-feeding requires a large amount of energy compared to other behaviours humpback whales breathe three times harder after returning to the surface from a foraging dive than from singing. Lunge-feeding whales also spent half as much time under water compared to singing whales.

Not surprisingly, the team found that the longer the dive, the more lunges were taken and more time and breaths were required before the next dive. The whales also stuck to the uppermost level of dense krill patches to maximize prey catch for its energy expenditure, according to the study.

By integrating tag data and hydrodynamic theory inspired from parachute inflation studies, Goldbogen now plans to compare lunge-feeding performance among blue, fin and humpback whales to determine whether the energy cost of a lunge is higher for bigger rorquals.

"We believe lunge feeding is related to the overall evolutionary and ecological success of rorquals, but the high energy cost may impose a physical limit on how big, and also how small, a whale can get."


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Contact: Brian Lin
brian.lin@ubc.ca
604-822-2234
University of British Columbia
Source:Eurekalert

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