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Journal of Mammalian Evolution

, Volume 17, Issue 3, pp 193–209 | Cite as

Comparative Scaling of Humeral Cross-Sections of Felids and Canids Using Radiographic Images

  • Julie Meachen-SamuelsEmail author
Original Paper

Abstract

The cortical thickness of long bones can be an effective indicator of locomotor modes and other stresses encountered by bone. Felids and canids are two carnivoran families that have similar levels of phylogenetic diversity and overlap in body size, but differ in their locomotor habits. Many canids and felids are cursorial, but felids also climb more frequently than canids. Felids also display a secondary use for their forelimbs not observed in any canids: they use their forelimbs to grasp and subdue prey. Large felids use their forelimbs much more extensively to subdue prey than do large canids and, therefore, should have proportionately greater forces applied to their forelimbs. This study uses a non-invasive radiographic approach to examine the differences in cortical thickness in the humerus between the Felidae and Canidae, as well as between size groups within these two families. Results show few significant differences between the two families, with a slight trend toward more positive allometry in the felids. Overall, radiographic measurements were found to be better predictors of body mass than either prey killing behavior or locomotor mode in these two carnivoran families. One canid that demonstrated exceptionally high cortical area was the bush dog, Speothos venaticus. The rarely observed bush dog has been postulated to swim and dig regularly, and it may be that the thickened cortical bone reflects these behaviors.

Keywords

Humerus x-rays Cortical thickness Carnivore Body mass Allometry 

Notes

Acknowledgments

The following curators and collection managers kindly allowed access to specimens (and digital radiographic equipment) in their care: J. Dines (Museum of Natural History of Los Angeles County), C. Shaw and S. Cox (George C. Page Museum), K. Molina (Donald R. Dickey Collection of the University of California, Los Angeles), and L. Gordon and J. Jacobs (U.S. National Museum of Natural History). Discussion with and comments by B. Van Valkenburgh, J. Samuels, W. Binder, X. Wang, D. Jacobs, R. Wayne, P. J. Brantingham, K. Koepfli, V.L. Roth, T. Roberts, P. Durst, and two anonymous reviewers greatly improved this paper. This project was partially funded by a U.S. Dept. of Education Graduate Assistance in Areas of National Need (GAANN) fellowship from UCLA and partially funded by NESCent NSF Grant # EF-0423641.

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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.National Evolutionary Synthesis Center (NESCent)DurhamUSA

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