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Table 1.

Individual parameters for the single-pool exponential regression model calculated for the fractional incorporation rate of ingested proteins into the pool of metabolized substrates in six Myotis myotis

Individualδ13Cbreath(∞) (‰)δ13Cbreath(0)–δ13Cbreath(∞)(‰)k (min)r2corrt50 (min)
–24.2 –6.8 26.4 0.963 18.3 
–25.1 –5.8 29.4 0.949 20.4 
–24.2 –5.8 14.7 0.973 10.2 
–25.7 –3.6 17.9 0.975 12.4 
–24.9 –4.9 45.7 0.822 31.7 
–23.8 –6.2 53.0 0.930 36.7 
Mean ± 1 s.d. –24.6±0.7 –5.5±1.1 31.2±15.2  21.6±10.5 
Individualδ13Cbreath(∞) (‰)δ13Cbreath(0)–δ13Cbreath(∞)(‰)k (min)r2corrt50 (min)
–24.2 –6.8 26.4 0.963 18.3 
–25.1 –5.8 29.4 0.949 20.4 
–24.2 –5.8 14.7 0.973 10.2 
–25.7 –3.6 17.9 0.975 12.4 
–24.9 –4.9 45.7 0.822 31.7 
–23.8 –6.2 53.0 0.930 36.7 
Mean ± 1 s.d. –24.6±0.7 –5.5±1.1 31.2±15.2  21.6±10.5 

δ13Cbreath(∞), asymptotic stable carbon isotope ratio of exhaled CO2 when animals are equilibrated to the stable carbon isotope signature of their diet;δ 13Cbreath(0), stable isotope ratio of exhaled CO2 at time 0; k, residence time of isotopes in the pool of metabolized substrates; and t50, time at which 50% of carbon isotopes were exchanged in the animal's breath

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