Untersuchungen zur Klinalen Variation des Diapauseverhaltens von Panorpa vulgaris unter Besonderer Berücksichtigung der Unterschiede Zwischen Berg- und Flachlandpopulationen

  • K. P. Sauer


Insects forced to outlast periods of pessimal environmental conditions must have inborn mechanisms which enable them to foresee changes in their environments. These species need signals (proximate factors) indicating adverse environmental conditions and inducing diapause in time. Daylength is the most important proximate factor. At a given geographical point weather conditions change in different years whereas the course of daylength remains constant. Therefore the genetic variability within a population, with respect to the threshold of daylength, appears as a result of changing natural selection. As daylength and weather conditions both vary geographically a species using daylength as a proximate factor should be devided into local populations each of which is adapted to the local environment. As the conditions of natural selection vary geographically dines are formed concerning the threshold of daylength.


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Copyright information

© Springer Science+Business Media Dordrecht 1976

Authors and Affiliations

  • K. P. Sauer
    • 1
  1. 1.Biologisches Institut I (Zoologie)78 FreiburgDeutschland

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