Table 1.

Rates of oxygen consumption, carbon dioxide production and the respiratory exchange ratio (RER) during flights across a range of speeds

V̇O2 (ml O2 kg-1 s-1)
V̇CO2 (ml CO2 kg-1 s-1)
RER(V̇CO2/V̇O2)
Flight speed (m s-1)BudgerigarCockatielBudgerigarCockatielBudgerigarCockatiel
5 11.9±0.4 7.7±0.1  6.9±0.2  0.91±0.02 
6 10.8±0.3 7.2±0.1 7.8±0.3 5.5±0.2 0.75±0.02 0.76±0.07 
8 9.3±0.2 5.4±0.2 7.0±0.1 4.0±0.2 0.77±0.04 0.74±0.05 
10 9.1±0.2 5.1±0.2 6.9±0.1 3.8±0.2 0.75±0.04 0.75±0.07 
12 9.6±0.2 6.3±0.2 7.7±0.2 4.6±0.2 0.80±0.05 0.72±0.05 
14 10.9±0.9 6.6±0.3 9.2±1.3 4.6±0.1 0.88±0.01 0.71±0.04 
15  8.3±0.3  6.8±0.9  0.81±0.11 
V̇O2 (ml O2 kg-1 s-1)
V̇CO2 (ml CO2 kg-1 s-1)
RER(V̇CO2/V̇O2)
Flight speed (m s-1)BudgerigarCockatielBudgerigarCockatielBudgerigarCockatiel
5 11.9±0.4 7.7±0.1  6.9±0.2  0.91±0.02 
6 10.8±0.3 7.2±0.1 7.8±0.3 5.5±0.2 0.75±0.02 0.76±0.07 
8 9.3±0.2 5.4±0.2 7.0±0.1 4.0±0.2 0.77±0.04 0.74±0.05 
10 9.1±0.2 5.1±0.2 6.9±0.1 3.8±0.2 0.75±0.04 0.75±0.07 
12 9.6±0.2 6.3±0.2 7.7±0.2 4.6±0.2 0.80±0.05 0.72±0.05 
14 10.9±0.9 6.6±0.3 9.2±1.3 4.6±0.1 0.88±0.01 0.71±0.04 
15  8.3±0.3  6.8±0.9  0.81±0.11 

Budgerigars (N=4, body mass=36.7±2.1 g); cockatiels(N=3, body mass=80.5±5.6 g).

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