Stable carbon and nitrogen isotope analysis of avian uric acid.

  title={Stable carbon and nitrogen isotope analysis of avian uric acid.},
  author={Michael I Bird and Elaine Tait and Christopher M. Wurster and Robert W. Furness},
  journal={Rapid communications in mass spectrometry : RCM},
  volume={22 21},
We report results obtained using a new technique developed to measure the stable-isotope composition of uric acid isolated from bird excreta (guano). Results from a diet-switch feeding trial using zebra finches suggest that the delta(13)C of uric acid in the guano equilibrates with the diet of the bird within 3 days of a change in diet, while the equilibration time for delta(15)N may be longer. The average carbon isotope discrimination between uric acid and food before the diet switch was +0.34… CONTINUE READING

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