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Fig. 4. Relationship between the estimated half-life of isotopes in blood (A,B) and wing membrane (C,D) (filled circles, nitrogen isotopes; open circles, carbon isotopes; data from Voigt et al., 2003b). The estimated half-life of nitrogen isotopes was not significantly correlated with body mass loss (Table 2). The sample volume was too small in some cases to measure the nitrogen isotope ratio. Thus, we could not calculate individual t50 values for these individuals (one data point in A and C; two data points in B and D).





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