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50%
6.25%
3.125%
25%
12.5%
100%
1 00%
12.5%
25%
3.125%
6.25%
50%
3.125%
6.25%
12.5%
25%
50%
100%
Figure 2.9. To p : h e let i gure shows the test arena used for assays of light
sensitivity based on the design of Jochen Erber. Bees were placed under the light
bucket and were exposed to light of increasing intensities. Lights of equal
intensities were on opposite sides of the chamber. Relative light intensities
increased serially from 3.125 percent to 100 percent. h e right i gure shows the
path of a tested bee. A light was turned on, and the bee was given time to orient to
the light and approach it. At er the bee reached the light, it was turned of , and the
light of the same intensity on the opposite side was turned on. h e bee would
then traverse the arena to the light on the other side until it made four complete
trips. h en the next light intensity was tested. h e bottom part shows how the
length of the path decreased with greater light intensities. Reprinted from
Behavioural Brain Research 205(1), Tsuruda JM, Page RE. “h e ef ects of foraging
role and genotype on light and sucrose responsiveness in honey bees ( Apis
mellifera L.),” 132-137, Fig. 1 (2009), with permission from Elsevier.
 
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