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Figure 2


Fig. 2. Relationship between respiratory quotient (RQ=VCO2/VO2) and {delta}13C value of expired CO2 ({delta}13Cbreath) during the same hover-feeding event in Anna's (Calypte anna) and rufous (Selasphorus rufus) hummingbirds. Data are pooled for each species. Pairwise comparisons reveal a significant correlation between these variables for each species (S. rufus: r20=0.9494, P<0.0001; C. anna: r17=0.9065; P<0.0001).