Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/89692
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Type: Journal article
Title: Blood flow for bone remodelling correlates with locomotion in living and extinct birds
Author: Allan, G.
Cassey, P.
Snelling, E.
Maloney, S.
Seymour, R.
Citation: Journal of Experimental Biology, 2014; 217(16):2956-2962
Publisher: Company of Biologists
Issue Date: 2014
ISSN: 0022-0949
1477-9145
Statement of
Responsibility: 
Georgina H. Allan, Phillip Cassey, Edward P. Snelling, Shane K. Maloney and Roger S. Seymour
Abstract: Nutrient arteries enter limb bones through discrete foramina on the shafts. They are required for bone remodelling in response to mechanical loading and dynamic forces imposed by locomotion. The cross-sectional area of the nutrient foramen of the femur represents an index of blood flow rate to the shaft and thus provides insight into the animal's level of activity. Morphometric data on femoral length, mass and foramen size from 100 extant bird species and eight extinct moa species were analysed allometrically and phylogenetically. The nutrient foramen blood flow index (Qi) and femur mass (Mf) increase with body mass (Mb). At 1 kg body mass, cursorial species have approximately 2.1 times higher Qi and 1.9 times heavier Mf than volant species. The scaling of Qi on Mf is independent of the primary mode of locomotion, but the ratio Qi/Mf decreases significantly in larger birds, although absolute Qi increases. The overall avian equation for Qi on Mb is not significantly different from previous data from mammals, but when differences in blood pressure are accounted for, estimated blood flow to the femur is approximately 1.9 times higher in cursorial birds than in mammals, possibly in relation to bipedalism and quadrupedalism, respectively. Femoral bone blood flow in both endothermic groups is estimated to be 50-100 times higher than in ectothermic reptiles.
Keywords: Bird; Locomotion; Blood flow; Bone remodelling; Nutrient foramen; Allometry
Rights: © 2014. Published by The Company of Biologists Ltd.
RMID: 0030012746
DOI: 10.1242/jeb.102889
Grant ID: http://purl.org/au-research/grants/arc/DP120102081
Appears in Collections:Earth and Environmental Sciences publications

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