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Scaling of rotational inertia in murine rodents and two species of lizard

Rebecca M. Walter* and David R. Carrier

Department of Biology, 201 South Biology Building, University of Utah, Salt Lake City, UT 84112, USA



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  		Fig. 1. Cladogram illustrating phylogenetic relationships and body shapes of representative synapsids. The phylogeny is compiled from Sidor and Hopson (1998Go), Sidor (1996Go), and Wilkinson (1999Go). Spacing along cladogram does not represent a timeline. Figures of body configuration are from Benton (1997Go).

 


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  		Fig. 2. Illustration of the arrangement for measuring rotational inertia. Animals were videotaped at 120 Hz while being oscillated as pendulums about each of two axes. Position data, obtained from digitizing a reflective marking on the animal, were used to determine the period of ocillation (see Materials and methods).

 


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  		Fig. 3. Logarithmic plot of rotational inertia versus body mass for Iguana iguana (gray triangles), Varanus exanthematicus (filled circles) and murine rodents (open diamonds). Broken lines indicate extrapolation beyond the measured data set. The scaling relationships shown were determined from reduced major axis slopes. Rotational inertia values from two 9 g iguanas were averaged (mean 1.44x10-5±5.01x10-7 kg m2), as were those from four 10 g iguanas (mean 1.83x10-5±1.45x10-6 kg m2).

 




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