Journal of Comparative Physiology A

, Volume 161, Issue 5, pp 711–714 | Cite as

Crcadian rhythms — endogenous or exogenous?

  • John Brady


A recent paper (Martin and Martin 1987) proposes that the 24-h behavioural rhythmicity of honeybees is not controlled by an endogenous (i.e. circadian) clock but merely exogenously by, in particular, the bees' responses to diel changes in the local geomagnetic field. The evidence derives from experiments involving the transplantation of the mushroom bodies from bees trained to feed at noon in Seattle, USA, into untrained bees tested at Würzburg, West Germany. This and earlier evidence is here re-examined and shown to be consistent with the more accepted explanation of endogenous circadian rhythmicity — while acknowledging the probability that bees do use local magnetic time cues as entraining Zeitgebers.


Circadian Rhythmicity Early Evidence Mushroom Body Local Magnetic Time Accepted Explanation 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • John Brady
    • 1
  1. 1.Department of Pure and Applied BiologyImperial CollegeAscotEngland

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