Translator Disclaimer
1 March 2013 Comparative Humeral Microanatomy of Terrestrial, Semiaquatic, and Aquatic Carnivorans using Micro-Focus CT Scan
Author Affiliations +
Abstract

In order to investigate the relationship between limb bone internal structure and the aquatic adaptation, we examined humeri of multiple carnivoran species of various lifestyles (terrestrial, semiaquatic, and aquatic) using micro-focus CT scanner. The transverse section image passing through the inferred center of ossification is analyzed in order to estimate the structural remodeling in periosteal bone. Meanwhile, structural characteristics in sagittal section images of proximal end were described in order to assess the characteristics in endochondral bone. The degree of cancellousness around the center of ossification, which is interpreted as the amount of resorption in periosteal compact bone, is the lowest in the semiaquatic group and the highest in terrestrial groups. This suggests that the ratio of periosteal bone resorption in limb bones decreases in the first stage of the aquatic adaptation, possibly due to the less need for skeletal lightening in semiaquatic taxa than the terrestrial taxa, and then increases as the limb bones reduces their support function on land, presumably in relation to the deep diving. The bone trabecular architecture in humeral head is fine and well-oriented in terrestrial to semiaquatic carnivorans, while that of aquatic carnivorans is rather coarse and randomly oriented.

© The Mammal Society of Japan
Yasuhisa Nakajima and Hideki Endo "Comparative Humeral Microanatomy of Terrestrial, Semiaquatic, and Aquatic Carnivorans using Micro-Focus CT Scan," Mammal Study 38(1), 1-8, (1 March 2013). https://doi.org/10.3106/041.038.0101
Received: 20 June 2012; Accepted: 1 July 2012; Published: 1 March 2013
JOURNAL ARTICLE
8 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top