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Table 1.

Mean physiological and meteorological variables during doubly labeled water measurements of white-crowned sparrows breeding at Point Reyes Bird Observatory (sea level) and Tioga Pass Meadow (montane) sites

Population
VariableSea level (N=22)Montane (N=31)t51(P)*
Body mass (g) 28.2±1.7 28.3±1.7 1.03 (0.31) 
Mass change (%) 0.02±2.02 -1.27±1.94 2.33 (0.02) 
Rate of CO2 production (ml CO2 g-1h-15.20±0.56 6.56±0.86 6.49 (<0.001) 
Daily energy expenditure (kJ day-183.7±9.6 103.6±12.2 6.33 (<0.001) 
Water efflux (ml H2O kg-1 day-1450±78 572±172 3.05 (0.004) 
Shade air temperature (°C) 15.6±1.6 9.0±2.6 10.8 (<0.001) 
Standard operative temperature (°C) 11.4±2.9 1.1±3.9 10.6 (<0.001) 
Wind speed (ms-10.98±0.38 1.70±0.37 9.45 (<0.001) 
Population
VariableSea level (N=22)Montane (N=31)t51(P)*
Body mass (g) 28.2±1.7 28.3±1.7 1.03 (0.31) 
Mass change (%) 0.02±2.02 -1.27±1.94 2.33 (0.02) 
Rate of CO2 production (ml CO2 g-1h-15.20±0.56 6.56±0.86 6.49 (<0.001) 
Daily energy expenditure (kJ day-183.7±9.6 103.6±12.2 6.33 (<0.001) 
Water efflux (ml H2O kg-1 day-1450±78 572±172 3.05 (0.004) 
Shade air temperature (°C) 15.6±1.6 9.0±2.6 10.8 (<0.001) 
Standard operative temperature (°C) 11.4±2.9 1.1±3.9 10.6 (<0.001) 
Wind speed (ms-10.98±0.38 1.70±0.37 9.45 (<0.001) 

Values are means±S.D.

*

Student's t value with probability in parentheses.

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