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First published online February 13, 2009
Journal of Experimental Biology 212, 610-619 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.025775
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Aerobic capacity and running performance across a 1.6 km altitude difference in two sciurid rodents

Mark A. Chappell* and Elizabeth M. Dlugosz

Biology Department, University of California, Riverside, CA 92521, USA


Figure 1
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  		Fig. 1. Representative examples of relationships between wheel-running speed and metabolic rate in (A) a least chipmunk (30.9 g male measured at SNARL) and (B) a golden-mantled ground squirrel (144.3 g female measured at Barcroft).

 

Figure 2
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  		Fig. 2. Maximum metabolic rates (Formula 2O2,max) during forced exercise in least chipmunks (left, squares) and golden-mantled ground squirrels (right, circles). Solid symbols and lines indicate measurements at SNARL (2165 m elevation), and open symbols and broken lines show measurements made at Barcroft (3800 m).

 

Figure 3
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  		Fig. 3. Frequency distributions of Formula 2O2 during running (left) and running speed (center), and the distance traveled at different speeds (right) for (A) least chipmunks and (B) golden-mantled ground squirrels during voluntary locomotion in running wheels. FIlled histograms show data obtained at SNARL (2165 m elevation), and open histograms show data obtained at Barcroft (3800 m). Downward-pointing arrows show mean speeds.

 

Figure 4
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  		Fig. 4. The energy cost of transport in least chipmunks (circles and solid lines) and golden-mantled ground squirrels (squares and broken lines). The lines were generated from mean values of the slope and intercept of the speed versus Formula 2O2 relationships. Filled symbols indicate values measured at SNARL (2165 m elevation), and open symbols indicate values measured at Barcroft (3800 m). Lines terminate at the highest observed running speed (1-min average) at each site. Triangles and diamonds are means of minimal resting metabolic rates (RMR) for least chipmunks and golden-mantled ground squirrels, respectively. Thin lines are predictions from the Taylor et al. (Taylor et al., 1982Go) allometric equations for metabolic rate during running (solid line=33.6 g least chipmunk, and broken line=144.5 g golden-mantled ground squirrel).

 

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© The Company of Biologists Ltd 2009