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Fig. 5. Predicted thoracic temperature (Tthx) during flight for
N. hybridus, the largest species, N. guttula and N.
investigator. Operative temperatures (Te) measured
throughout an entire day in late July 2001 were then used to predict the
flight Tthx for the three species using the regression of
post-flight Tthx against the Te
developed for each species. The bars represent possible flight times
throughout the day for the three species. Flight times were estimated based on
the minimum and maximum thoracic temperatures recorded for each species
following a flight trial.