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Table 3.

Activity records, cane sugar intake and energy expenditure for rufous(S. rufus) and Anna's (C. anna) hummingbirds

Cane sugar
SpeciesIDSexMass change* (g)Time spent hovering (%)Total energy expenditure (J)Volume consumed(ml)Amount ingested (μmol)Amount metabolized (μmol)% Ingested oxidized
S. rufus           
 N43975 3.27 3.91 4.4 1542 0.397 232.1 72.8 31.3 
 N43978 3.36 3.59 9.6 1637 0.909 531.4 155.2 29.2 
 N44063 3.29 3.48 3.0 1202 0.612 357.9 109.5 30.6 
 N44064 3.79 3.95 9.3 1820 0.483 282.3 100.4 35.6 
 Mean ± s.d.    6.6±3.4 1551±259 0.601±0.224 350.9±131.0 109.5±34.3 31.7±2.7 
C. anna           
 N44016 4.74 5.06 18.1 2737 0.578 501.4 244.1 48.7 
 N44021 5.59 5.78 5.3 2363 0.372 217.4 106.8 49.1 
 N44040 3.99 4.18 5.4 1297 0.612 338.0 130.7 38.7 
 Mean ± s.d.    9.6±7.4 2132±748 0.521±0.130 352.2±142.6 160.5±73.4 45.5±5.9 
Cane sugar
SpeciesIDSexMass change* (g)Time spent hovering (%)Total energy expenditure (J)Volume consumed(ml)Amount ingested (μmol)Amount metabolized (μmol)% Ingested oxidized
S. rufus           
 N43975 3.27 3.91 4.4 1542 0.397 232.1 72.8 31.3 
 N43978 3.36 3.59 9.6 1637 0.909 531.4 155.2 29.2 
 N44063 3.29 3.48 3.0 1202 0.612 357.9 109.5 30.6 
 N44064 3.79 3.95 9.3 1820 0.483 282.3 100.4 35.6 
 Mean ± s.d.    6.6±3.4 1551±259 0.601±0.224 350.9±131.0 109.5±34.3 31.7±2.7 
C. anna           
 N44016 4.74 5.06 18.1 2737 0.578 501.4 244.1 48.7 
 N44021 5.59 5.78 5.3 2363 0.372 217.4 106.8 49.1 
 N44040 3.99 4.18 5.4 1297 0.612 338.0 130.7 38.7 
 Mean ± s.d.    9.6±7.4 2132±748 0.521±0.130 352.2±142.6 160.5±73.4 45.5±5.9 
*

Mass change during period of cane sugar availability.

Volume of cane sugar solution consumed.

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