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Figure 2


Fig. 2. Relationship between respiratory quotient (RQ=Formula 3CO2/Formula 3O2) and {delta}13C value of expired breath ({delta}13Cbreath, {per thousand} VPDB) during the same hover-feeding event in Anna's hummingbirds (C. anna; N=2) and rufous hummingbirds (S. rufus; N=10) as well as Pallas' long-tongued nectar bats (G. soricina; N=7). Data are pooled for each species. Pairwise comparisons reveal a significant correlation between these variables for each species (C. anna: r22=0.9767, P<0.0001; S. rufus: r81=0.9185, P<0.0001; G. soricina: r91=0.9374, P<0.0001).