Behavioral impacts of disentanglement of a right whale under sedation and the energetic cost of entanglement

Authors: 

van der Hoop, J., Moore, M., Fahlman, A., Bocconcelli, A., George, C. et al.

Year: 

2013

Journal/Publisher Name: 

Marine Mammal Science

Publisher Address: 

Volume (Issue #): 

30

Page #s: 

282-307

Contact information: 

Biology Department, Woods Hole Oceanographic Institution, Massachusetts, U.S.A jvanderhoop@whoi.edu
Summary: 

The kinematics of a tagged entangled North Atlantic right whale, before, during and after disentanglement were examined. Three sets of gear attached to a load-cell tensiometer at multiple speeds were used to calculate additional drag forces and energetic demand. Tag analyses revealed significant increases in dive depths and duration; ascent, descent and fluke stroke rates; and decreases in rot mean square fluke amplitude were significantly greater than in the non-entangled case. Increases in total power input over the non-entangled condition ranged from 1.6% to 120.9% for all gear configurations tested. Locomotory power requirements increased 60-164.6%. These results suggest significant alteration to swimming patterns and the magnitude of energy depletion in a chronically entangled whale.