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Title: Biting mechanics determines craniofacial morphology among extant diprotodont herbivores: Dietary predictions for the giant extinct short-faced kangaroo, Simosthenurus occidentalis.
Contributor(s): Mitchell, David (creator)orcid ; Wroe, Stephen  (supervisor)orcid 
Publication Date: 2018-12-31
Open Access: Yes
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Abstract/Context: Larger herbivores can act as keystone species which strongly influence their communities. During the Pliocene and Pleistocene, Australia was dominated by a number of large to gigantic marsupial herbivore taxa. Many of these have been understudied quantitatively with regards to their ecology; and identifying the diet of these species will improve our understanding of not only their ecologies, but also of past environments. Recent research has found that cranial morphology among kangaroos and wallabies corresponds with foraging behaviours and mechanical properties of preferred plant tissues. Here we apply shape analysis and computational biomechanics to test two hypotheses: that feeding ecology is associated with craniofacial morphology across a taxonomically broad sample of diprotodont herbivores, and that this association can then be used to predict the diet of an extinct short-faced kangaroo, Simosthenurus occidentalis. We find that biting behaviours are reflected in craniofacial morphology for all medium-large extant marsupial herbivores studied, but that these are more a reflection of the hardest bites required for their lifestyle, rather than diet composition alone. A combination of a very short face, robust musculoskeletal features, and dental arrangements predict that S. occidentalis was a browser, capable of consuming particularly resistant, bulky plant matter. These features were largely conserved among other short-faced kangaroos and may have offset the unpredictable availability of quality forage during the climatically variable Pleistocene epoch; contributing to their prolific diversification during this time.
Publication Type: Dataset
Grant Details: ARC/DP140102659
Field of Research (FOR): 060807 Animal Structure and Function
060809 Vertebrate Biology
Socio-Economic Outcome Codes: 970106 Expanding Knowledge in the Biological Sciences
Keywords: Herbivory, geometric morphometrics, finite element analysis, sthenurine, marsupial
HERDC Category Description: X Dataset
Description: Work was supported by ARC Discovery grant nos. DP140102659 and DP140102656 to Stephen Wroe.
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School of Environmental and Rural Science

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