Quantitative computed tomography of humpback whale (Megaptera novaeangliae) mandibles : mechanical implications for rorqual lunge-feeding


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dc.contributor.author Field, Daniel J.
dc.contributor.author Campbell-Malone, Regina
dc.contributor.author Goldbogen, Jeremy A.
dc.contributor.author Shadwick, Robert E.
dc.date.accessioned 2010-08-27T16:31:01Z
dc.date.available 2010-08-27T16:31:01Z
dc.date.issued 2010-01-25
dc.identifier.uri http://hdl.handle.net/1912/3885
dc.description Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology 293 (2010): 1240-1247, doi:10.1002/ar.21165 en_US
dc.description.abstract Rorqual whales (Balaenopteridae) lunge at high speed with mouth open to nearly 90 degrees in order to engulf large volumes of prey-laden water. This feeding process is enabled by extremely large skulls and mandibles that increase mouth area, thereby facilitating the flux of water into the mouth. When these mandibles are lowered during lunge-feeding, they are exposed to high drag and therefore may be subject to significant bending forces. We hypothesized that these mandibles exhibited a mechanical design (shape and density distribution) that enables these bones to accommodate high loads during lunge-feeding without exceeding their breaking strength. We used quantitative computed tomography (QCT) to determine the three-dimensional geometry and density distribution of a pair of sub-adult humpback whale (Megaptera novaeangliae) mandibles (length = 2.10 m). QCT data indicated highest bone density and crosssectional area, and therefore high resistance to bending and deflection, from the coronoid process to the middle of the dentary, which then decreased towards the anterior end of the mandible. These results differ from the caudorostral trends of increasing mandibular bone density in mammals such as humans and the right whale, Eubalaena glacialis, indicating that adaptive bone remodeling is a significant contributing factor in establishing mandibular bone density distributions in rorquals. en_US
dc.description.sponsorship This work was funded by an NSERC undergraduate summer research award to Daniel J. Field, and by an NSERC discovery grant to Robert E. Shadwick. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1002/ar.21165
dc.subject Rorqual en_US
dc.subject Mandible en_US
dc.subject Lunge-feeding en_US
dc.subject Quantitative computed tomography en_US
dc.subject Flexural rigidity en_US
dc.title Quantitative computed tomography of humpback whale (Megaptera novaeangliae) mandibles : mechanical implications for rorqual lunge-feeding en_US
dc.type Preprint en_US

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