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Fig. 4. Typical example of the raw flight data and the methods used to calculate
kc over the flight period for (A) sunbirds and (B)
starlings. A linear regression was fitted before flight and
forward-extrapolated to the adjusted time when flight began (accounting for
time spent on perches). A polynomial regression was fitted to the enrichment
after flight and back-extrapolated to the adjusted time when the flight ended
(as described by Hambly et al.,
2002). The resulting gradient between these two points was the
isotope elimination rate (kc, min-1) over the
flight period.
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