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Table 2.

Correlation (r) between daily energy expenditure of white-crowned sparrows breeding at Point Reyes Bird Observatory (PRBO) and Tioga Pass Meadow (TPM) and various measures of environmental temperature

PRBO (N=22)TPM (N=31)Both (N=53)
Temperature*RangerPRangerPRangerP
Mean Tes 9.8 -0.119 0.60 15.7 -0.290 0.11 26.4 -0.650 <0.001 
Mean Ta 5.3 -0.006 0.93 11.8 -0.275 0.13 17.3 -0.637 <0.001 
Tes bush, day 11.2 -0.047 0.82 14.0 -0.322 0.07 23.7 -0.608 <0.001 
Night Ta 6.0 -0.148 0.52 12.0 -0.064 0.73 20.5 -0.596 <0.001 
Ambient temperature 6.9 -0.006 0.93 13.2 -0.275 0.13 21.5 -0.644 <0.001 
PRBO (N=22)TPM (N=31)Both (N=53)
Temperature*RangerPRangerPRangerP
Mean Tes 9.8 -0.119 0.60 15.7 -0.290 0.11 26.4 -0.650 <0.001 
Mean Ta 5.3 -0.006 0.93 11.8 -0.275 0.13 17.3 -0.637 <0.001 
Tes bush, day 11.2 -0.047 0.82 14.0 -0.322 0.07 23.7 -0.608 <0.001 
Night Ta 6.0 -0.148 0.52 12.0 -0.064 0.73 20.5 -0.596 <0.001 
Ambient temperature 6.9 -0.006 0.93 13.2 -0.275 0.13 21.5 -0.644 <0.001 

Ta, ambient temperature; Tes,standard operative temperature.

*

See Materials and methods for descriptions of temperature measurements.

Temperature range during daily energy expenditure measurements.

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