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Table 2.

Kinetics of change in δ13Cbreath values over the course of the experiment for rufous (S. rufus) and Anna's (C. anna)hummingbirds

BirdIDSexki (min-1)kd (min-1)fexo
S. rufus      
 N43975 0.007 0.135 0.61 
 N43978 0.162 0.092 1.01 
 N44063 0.105 0.132 0.96 
 N44064 0.009 0.077 0.75 
 Mean ± s.d.  0.071±0.076 0.109±0.029 0.83±0.18 
C. anna      
 N44016 0.061 0.053 0.94 
 N44021 0.002 0.059 0.46 
 N44040 0.071 0.059 1.03 
 Mean ± s.d.  0.045±0.037 0.057±0.004 0.81±0.31 
BirdIDSexki (min-1)kd (min-1)fexo
S. rufus      
 N43975 0.007 0.135 0.61 
 N43978 0.162 0.092 1.01 
 N44063 0.105 0.132 0.96 
 N44064 0.009 0.077 0.75 
 Mean ± s.d.  0.071±0.076 0.109±0.029 0.83±0.18 
C. anna      
 N44016 0.061 0.053 0.94 
 N44021 0.002 0.059 0.46 
 N44040 0.071 0.059 1.03 
 Mean ± s.d.  0.045±0.037 0.057±0.004 0.81±0.31 

ki, fractional rate of isotope incorporation into pool of expired CO2; kd, fractional rate of isotope disappearance from pool of expired CO2; fexo,proportion of expired CO2 derived from oxidation of cane sugar[during period of availability of cane sucrose solution whenδ 13Cbreath values had reached a plateau (defined as period beginning 40 min after first feeding on cane sucrose)].

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