Periodicity Fade-Out; Initiation by External Factors

  • Erwin Bünning
Part of the Heidelberg Science Library book series (HSL)


It was mentioned earlier that animals and plants will show an endogenous diurnal rhythm even if they have not been exposed to diurnal cycles of environmental factors during their embryonic development. One more point has to be added: very often these organisms do not show any periodicity at first, but a single stimulus is then sufficient to initiate the rhythm (Bünning, 1931, 1935a, b; Ball and Dyke; Fig. 25 to 27). Since the necessary single stimulus can be compared with the stimulus required for the re-initiation of a rhythm which has faded out, the phenomenon of a rhythm fading out will be discussed first.


Diurnal Cycle Dark Period Continuous Light Single Stimulus Unicellular Organism 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1964

Authors and Affiliations

  • Erwin Bünning
    • 1
  1. 1.University of TübingenGermany

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