Table 1.

Metabolic rates and dive performance of muskrats prior to and following 9–11 weeks acclimation to a holding tank that restricted aquatic activity either to surface swimming (controls) or to diving

Surface swimmers (N=12)
Divers (N=12)
Pre-trainingPost-trainingPre-trainingPost-trainingP
Resting O2 in air (ml g-1 h-10.83±0.04 0.68±0.02 0.85±0.03 0.77±0.04 0.040* 
Diving O2 (ml g-1 h-12.49±0.18 1.94±0.21 2.05±0.22 2.22±0.18 0.277* 
Cumulative dive time (s) 430.6±35.5 441.0±44.3 486.0±23.8 431.7±37.7 0.438 
Total number of dives 16.5±1.7 17.5±1.5 17.3±1.6 17.4±2.0 0.478 
Mean dive duration (s)      
All exploratory dives 27.5±1.7 25.1±1.8 30.7±2.9 25.9±2.4 0.388 
Five longest exploratory dives 40.0±2.2 37.4±2.4 48.8±4.8 39.1±4.2 0.369 
Longest exploratory dive 56.4±6.0 46.9±2.8 90.3±22.9 54.4±10.5 0.295 
Surface swimmers (N=12)
Divers (N=12)
Pre-trainingPost-trainingPre-trainingPost-trainingP
Resting O2 in air (ml g-1 h-10.83±0.04 0.68±0.02 0.85±0.03 0.77±0.04 0.040* 
Diving O2 (ml g-1 h-12.49±0.18 1.94±0.21 2.05±0.22 2.22±0.18 0.277* 
Cumulative dive time (s) 430.6±35.5 441.0±44.3 486.0±23.8 431.7±37.7 0.438 
Total number of dives 16.5±1.7 17.5±1.5 17.3±1.6 17.4±2.0 0.478 
Mean dive duration (s)      
All exploratory dives 27.5±1.7 25.1±1.8 30.7±2.9 25.9±2.4 0.388 
Five longest exploratory dives 40.0±2.2 37.4±2.4 48.8±4.8 39.1±4.2 0.369 
Longest exploratory dive 56.4±6.0 46.9±2.8 90.3±22.9 54.4±10.5 0.295 

Dive performance was based on a 15 min observation session in the diving tank (see text for details).

P values are for post-training comparisons of surface swimmers and divers. Asterisks denote two-tailed P values; all other Pvalues are for one-tailed comparisons.

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