Keeling plots for hummingbirds: a method to estimate carbon isotope ratios of respired CO2 in small vertebrates

@article{Carleton2004KeelingPF,
  title={Keeling plots for hummingbirds: a method to estimate carbon isotope ratios of respired CO2 in small vertebrates},
  author={Scott A. Carleton and Blair O Wolf and Carlos Rio},
  journal={Oecologia},
  year={2004},
  volume={141},
  pages={1-6}
}
The carbon isotope composition of an animal’s breath reveals the composition of the nutrients that it catabolizes for energy. Here we describe the use of Keeling plots, a method widely applied in ecosystem ecology, to measure the δ13C of respired CO2 of small vertebrates. We measured the δ13C of Rufous Hummingbirds (Selasphorus rufus) in the laboratory and of Mourning (Zenaida macroura) and White-winged (Z. asiatica) Doves in the field. In the laboratory, when hummingbirds were fed a sucrose… CONTINUE READING