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Figure 7


Fig. 7. The average rates of information transmission (in bits s–1) in the photoreceptors of the nocturnal and diurnal sweat bees Megalopta genalis (blue curves, N=8 cells) and Lasioglossum leucozonium (red curves, N=8 cells). (A) When the photoreceptors alone are considered (via a light source calibration in `effective photons' absorbed by the photoreceptor per second), it is evident that at all intensities Lasioglossum has a higher information rate than Megalopta. (B) When light sources are instead calibrated to external ambient intensities (a normalised intensity of 100 corresponds to the light intensity on an overcast day, or around 180 cd m–2), Megalopta has a higher information rate in dim light. This, however, is due to its 27 times more sensitive optics and is not due to an intrinsic adaptation present within the photoreceptors. Error bars show ±s.d. Both panels adapted with kind permission from Frederiksen et al. (Frederiksen et al., 2008).





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