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Figure 1


Fig. 1. Experiments consisted of three phases. In phase 1, broad-tailed hummingbirds (Selasphorus platycercus) were fed on a C3 diet for roughly 3 months. Phase 2 began on day 0 when the isotopic composition of the diet was changed from C3 to C4. Phase 2 lasted 20 days. Phase 3 began on day 20, when the isotopic composition of the hummingbirds' diet was shifted back to the original C3. Vertical lines denote the days we measured {delta}13C of exhaled CO2 in fasted and fed birds. We collected exhaled air from hummingbirds that were lightly restrained within a centrifuge tube that had been previously flushed with CO2-free air.





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