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

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    Date
    2013-03
    Author
    van der Hoop, Julie  Concept link
    Moore, Michael J.  Concept link
    Fahlman, Andreas  Concept link
    Bocconcelli, Alessandro  Concept link
    George, Clay  Concept link
    Jackson, Katharine  Concept link
    Miller, Carolyn A.  Concept link
    Morin, David  Concept link
    Pitchford, Thomas  Concept link
    Rowles, Teresa K.  Concept link
    Smith, Jamison  Concept link
    Zoodsma, Barb  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6562
    As published
    https://doi.org/10.1111/mms.12042
    Keyword
     Disentanglement; Dtag; Drag; Energetics; Entanglement; Sedation; Right whale; Eubalaena glacialis 
    Abstract
    Protracted entanglement in fishing gear often leads to emaciation through reduced mobility and foraging ability, and energy budget depletion from the added drag of towing gear for months or years. We examined changes in kinematics of a tagged entangled North Atlantic right whale (Eg 3911), before, during and after disentanglement on 15 Jan 2011. To calculate the additional drag forces and energetic demand associated with various gear configurations, we towed three sets of gear attached to a load-cell tensiometer at multiple speeds. Tag analyses revealed significant increases in dive depth and duration; ascent, descent and fluke stroke rates; and decreases in root mean square fluke amplitude (a proxy for thrust) following disentanglement. Conservative drag coefficients while entangled in all gear configurations (mean ± SD Cd,e,go = 3.4x10-3 ± 0.0003, Cd,e,gb = 3.7x10-3 ± 0.0003, Cd,e,sl = 3.8x10-3 ± 0.0004) were significantly greater than in the nonentangled case (Cd,n = 3.2x10-3±0.0003; P = 0.0156, 0.0312, 0.0078 respectively). Increases in total power input (including standard metabolism) over the nonentangled condition ranged 1.6%-120.9% for all gear configurations tested; locomotory power requirements increased 60.0%-164.6%. These results highlight significant alteration to swimming patterns, and the magnitude of energy depletion in a chronically entangled whale.
    Description
    Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Society for Marine Mammalogy for personal use, not for redistribution. The definitive version was published in Marine Mammal Science 30 (2014): 282–307, doi:10.1111/mms.12042.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Biology
    Suggested Citation
    Preprint: van der Hoop, Julie, Moore, Michael J., Fahlman, Andreas, Bocconcelli, Alessandro, George, Clay, Jackson, Katharine, Miller, Carolyn A., Morin, David, Pitchford, Thomas, Rowles, Teresa K., Smith, Jamison, Zoodsma, Barb, "Behavioral impacts of disentanglement of a right whale under sedation and the energetic cost of entanglement", 2013-03, https://doi.org/10.1111/mms.12042, https://hdl.handle.net/1912/6562
     

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