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To "enhance the propagation of the [vibrational] signal' of dancing, the bees chew away the side and bottom edges of a comb to make a comb that is better able to resonate:
http://jeb.biologists.org/content/199/12/2585.full.pdf
Yes, Jurgen Tauz yet again, but also Lindauer:
"The poor vibrational performance of large commercial combs and far better
performance of combs with free edges led us to direct our attention to combs
that had been used by bees over the summer and in which they had removed
cells between the comb and the frame... Transmission along cell rows in
areas fused to the frame is, as in all large frames, tuned to frequencies
around 20 Hz and no frequencies beyond 120 Hz are conducted far from the
source. However, 20 Hz signals passing across cells opposite an area of
comb freed from the frame are amplified, and although 250 Hz signals are
attenuated, the bandpass profile of the small wild combs can again be
recognized. Displacements of the rim of a cell in an area of comb freed of
the frame can be recorded in cells up to 30 cells away, suggesting that bees
dancing in a frameless area could broadcast signals over a much greater
distance than those dancing on framed combs."
This is one of many reasons why I still use wax foundation in the brood chamber, and only use the plastic foundation in honey supers.
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