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Table 2.

Metabolism (oxygen consumption, O2) during forced and voluntary exercise at the two test sites

TraitMean ± s.e.m. SNARLMean ± s.e.m. BarcroftF massP massF altitudeP altitude
Least chipmunk       
   Mass 32.0±0.47 31.3±0.71   0.52 0.48 
   O2,max 7.08±0.18 5.36±0.22 18.9 <0.0001* 46.4 <0.0001* 
   ADMR 49.5±1.7 46.5±2.9 0.60 0.45 0.63 0.44 
   RMR 0.742±0.045 0.791±0.069 0.88 0.36 0.33 0.57 
   O24.88±0.30 5.38±0.45 10.9 0.00376* 0.79 0.39 
   O24.64±0.23 4.76±0.35 10.6 0.00410* 0.08 0.79 
   O24.20±0.15 3.83±0.23 4.67 0.0437 1.73 0.20 
Golden-mantled ground squirrel       
   Mass 131.7±5.9 163.3±5.1  16.3 0.00018*  
   O2,max 19.3±0.82 19.3±0.70 18.1 <0.0001* 0.003 0.96 
   ADMR 165±9.0 131±8.7 12.4 0.0016* 6.70 0.016* 
   RMR 2.51±0.10 2.28±0.09 3.42 0.076 2.74 0.110 
   O218.0±0.81 15.0±0.78 7.08 0.0132* 6.45 0.0174* 
   O217.2±0.81 14.3±0.78 6.56 0.0166* 5.93 0.0221* 
   O216.4±0.68 13.0±0.65 13.4 0.00114* 12.2 0.00173* 
TraitMean ± s.e.m. SNARLMean ± s.e.m. BarcroftF massP massF altitudeP altitude
Least chipmunk       
   Mass 32.0±0.47 31.3±0.71   0.52 0.48 
   O2,max 7.08±0.18 5.36±0.22 18.9 <0.0001* 46.4 <0.0001* 
   ADMR 49.5±1.7 46.5±2.9 0.60 0.45 0.63 0.44 
   RMR 0.742±0.045 0.791±0.069 0.88 0.36 0.33 0.57 
   O24.88±0.30 5.38±0.45 10.9 0.00376* 0.79 0.39 
   O24.64±0.23 4.76±0.35 10.6 0.00410* 0.08 0.79 
   O24.20±0.15 3.83±0.23 4.67 0.0437 1.73 0.20 
Golden-mantled ground squirrel       
   Mass 131.7±5.9 163.3±5.1  16.3 0.00018*  
   O2,max 19.3±0.82 19.3±0.70 18.1 <0.0001* 0.003 0.96 
   ADMR 165±9.0 131±8.7 12.4 0.0016* 6.70 0.016* 
   RMR 2.51±0.10 2.28±0.09 3.42 0.076 2.74 0.110 
   O218.0±0.81 15.0±0.78 7.08 0.0132* 6.45 0.0174* 
   O217.2±0.81 14.3±0.78 6.56 0.0166* 5.93 0.0221* 
   O216.4±0.68 13.0±0.65 13.4 0.00114* 12.2 0.00173* 

ANCOVA with altitude as a fixed effect and body mass as covariate

For least chipmunks, sample sizes were 32 at SNARL (2165 m elevation) and 19 at Barcroft (3800 m) for O2,max, and 15 at SNARL and 7 at Barcroft for other traits. Sample sizes for golden-mantled ground squirrels were 22 at SNARL and 29 at Barcroft for O2,max, and 14 at SNARL and 15 at Barcroft for other traits

All metabolic variables are shown after adjusted to common masses (for least chipmunks, 31.0 g for O2,max and 33.6 g for other traits; for golden-mantled ground squirrels, 150.5 g for O2,max and 145.5 g for other traits). Symbols and units as in Table 1. P<0.05 are in bold; P values that remained significant after an FDR test are indicated with asterisks (*)

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