Many seem to doubt if  the of day lengt has any effect   to bees. 

In Apimondia in Montpellier 2009 I was listening for a talk by frensh 
engineer who was a hobby beekeeper. He had set up a system to record the voices 
of beehive. Or actualy just the vibrations that the noices caused to the hive 
walls, this way his microphone did not get wax / propolis on it. 



One of his findings was thet every morning there was a noticeable , special 
buzz in the hive for about 3 minutes. After little thinking he noticed that the 
time of the buzz changed daily by about a minute and quite soon he realized 
that it happened just when sun come up.  This also happened in cloudy days when 
no sun was visible by human eyes.



In my eyes quite a good proof that at least the bees note carefully when the 
sun comes up. 



Ari Seppälä

Finland

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