Optimal body size with respect to maximal speed for the yellow-spotted monitor lizard (Varanus panoptes; varanidae)

Clemente, Christofer J., Withers, Philip C. and Thompson, Graham (2012) Optimal body size with respect to maximal speed for the yellow-spotted monitor lizard (Varanus panoptes; varanidae). Physiological and Biochemical Zoology, 85 3: 265-273. doi:10.1086/665275

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Author Clemente, Christofer J.
Withers, Philip C.
Thompson, Graham
Title Optimal body size with respect to maximal speed for the yellow-spotted monitor lizard (Varanus panoptes; varanidae)
Journal name Physiological and Biochemical Zoology   Check publisher's open access policy
ISSN 1522-2152
Publication date 2012-05
Year available 2012
Sub-type Article (original research)
DOI 10.1086/665275
Open Access Status File (Publisher version)
Volume 85
Issue 3
Start page 265
End page 273
Total pages 9
Place of publication Chicago, IL United States
Publisher University of Chicago Press
Collection year 2013
Language eng
Formatted abstract
Studies of locomotor performance often link variation in morphology with ecology. While maximum sprint speed is a commonly used performance variable, the absolute limits for this performance trait are not completely understood. Absolute maximal speed has often been shown to increase linearly with body size, but several comparative studies covering a large range of body sizes suggest that maximal speed does not increase indefinitely with body mass but rather reaches an optimum after which speed declines. Because of the comparative nature of these studies, it is difficult to determine whether this decrease is due to biomechanical constraints on maximal speed or is a consequence of phylogenetic inertia or perhaps relaxed selection for lower maximal speed at large body size. To explore this issue, we have examined intraspecific variations in morphology, maximal sprint speed, and kinematics for the yellowspotted monitor lizard Varanus panoptes, which varied in body mass from 0.09 to 5.75 kg. We show a curvilinear relationship between body size and absolute maximal sprint speed with an optimal body mass with respect to speed of 1.245 kg. This excludes the phylogenetic inertia hypothesis, because this effect should be absent intraspecifically, while supporting the biomechanical constraints hypothesis. The relaxed selection hypothesis cannot be excluded if there is a size-based behavioral shift intraspecifically, but the biomechanical constraints hypothesis is better supported from kinematic analyses. Kinematic measurements of hind limb movement suggest that the distance moved by the body during the stance phase may limit maximum speed. This limit is thought to be imposed by a decreased ability of the bones and muscles to support body mass for larger lizards.
Keyword Alligator Alligator Mississippiensis
Quadrupedal Locomotion
Stride Frequency
3 Dimensional Kinematics
Terrestrial Locomotion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 6 times in Scopus Article | Citations
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Created: Sun, 14 Apr 2013, 23:29:52 EST by Gail Walter on behalf of School of Biological Sciences