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Journal of comparative physiology

, Volume 127, Issue 3, pp 191–195 | Cite as

Longevity among blowfliesPhormia terraenovae R.D. kept in non-24-hour light-dark cycles

  • Ursula von Saint Paul
  • Jürgen Aschoff
Article

Summary

From the day of hatching, groups of about 150 blowfliesPhormia terraenovae R.D. were continuously subjected to light-dark cycles (LD) of constant duration, ranging from 20 to 28 h (Zeitgeber period T), or to constant illumination (LL). Survival was determined by the number of days after which only 10% of the flies in each group were still alive, and expressed as percent of the survival of a control group kept in T=24 h. With T equal to 25, 26 or 27 h, survival was 100%; it was reduced to about 90% in T=23 or 28 h, to 85% in T=22 h, and to 70% in T=20 h. In LL, survival was between 52% and 75%, depending on light intensity. From records of locomotor activity, obtained from a few flies in each group, it can be concluded that in all the LD-conditions the activity rhythms were entrained by the Zeitgeber. Several possible explanations of the reduction of survival in the non-24-h days and in LL are discussed.

Keywords

Light Intensity Locomotor Activity Activity Rhythm Constant Illumination Constant Duration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • Ursula von Saint Paul
    • 1
  • Jürgen Aschoff
    • 1
  1. 1.Max-Planck-Institut für VerhaltensphysiologieAndechsFederal Republic of Germany

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