The Reactions of Hydra Attenuata Pall. to Various Photic Stimuli

  • Pierre Tardent
  • Ernst Frei
  • Markus Borner


According to various investigations and occasional observations (Trembley, 1744; Wilson, 1891; Haase-Eichler, 1931; Haug, 1933; Singer et al., 1963; Passano and McCullough, 1965; Tardent and Frei, 1969) the freshwater Hydra perceives photic stimuli and reacts to them. The reaction-patterns to sudden light-intensity changes consist of extensions and/or contractions of the body and the tentacles or of phototactically motivated locomotory activities oriented to or from a permanent light source.


Spectral Sensitivity Complete Darkness Spontaneous Contraction Fast Contraction Occasional Observation 
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Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • Pierre Tardent
    • 1
  • Ernst Frei
    • 1
  • Markus Borner
    • 1
  1. 1.Zoological InstituteUniversity of ZurichZurichSwitzerland

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