[MARMAM] New paper - Shape analysis of odontocete mandibles

Celia Barroso barrosocel at gmail.com
Tue Aug 14 13:01:05 PDT 2012

Dear colleagues,

We are pleased to announce the publication of the following paper in
Journal of Morphology:

Barroso, C., Cranford, T. W., and Berta, A. (2012). Shape analysis of
odontocete mandibles: Functional and evolutionary implications. J.
Morphol., 273: 1021–1030. doi: 10.1002/jmor.20040

Abstract. Odontocete mandibles serve multiple functions, including feeding
and hearing. We consider that these two major functions have their primary
influence in different parts of the mandibles: the anterior feeding
component and the posterior sound reception component, though these
divisions are not mutually exclusive. One hypothesis is that sound enters
the hearing apparatus via the pan bone of the posterior mandibles (Norris,
Evolution and Environment,1968<http://onlinelibrary.wiley.com/doi/10.1002/jmor.20040/abstract#bib41>,
pp 297–324). Another viewpoint, based on finite element models, suggests
that sound enters primarily through the gular region and the opening
created by the absent medial lamina of the posterior mandibles. This
unambiguous link between form and function has catalyzed this study, which
uses Geometric Morphometrics to quantify mandibular shape across all major
lineages of Odontoceti. The majority of shape variation was found in the
anterior (feeding) region: Jaw Flare (45.0%) and Symphysis Elongation
(35.5%). Shape differences in the mandibular foramen, within the posterior
(sound reception) region, also accounted for a small portion of the total
variation (10.9%). The mandibles are an integral component of the sound
reception apparatus in toothed whales and the geometry of the mandibular
foramen likely plays a role in hearing. Furthermore, model goodness-of-fit
tests indicate that mandibular foramina shapes, which appear conserved,
evolved under a selective regime, possibly driven by sound reception
requirements across Odontoceti. J. Morphol. © 2012 Wiley Periodicals, Inc.

Celia Barroso
San Diego State University
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