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

  • K. P. Sauer

Abstract

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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Literatur

  1. DANILEVSKIJ, A.S. (1965): Photoperiodism and Seasonal Development of Insects. First English Edition, Oliver and Boyd, Edinburgh and London.Google Scholar
  2. HUXLEY, J.S. (1939): Clines: An Auxiliary Method in Taxonomy. Bijdr. Dierk. 27: 491–520.Google Scholar
  3. HUXLEY, J.S. ( 1942 ): Evolution, the modern synthesis.Allen and Unwin, London.Google Scholar
  4. IMMELMANN, K. (1972): Erörterungen zur Definition und Anwendbarkeit der Begriffe „Ultimate Factor“, „Proximate Factor” und „Zeitgeber“. Oecologia (Berl.) 9: 259–264.CrossRefGoogle Scholar
  5. MASAKI, S. (1961): Geographic Variation of Diapause in Insects. Bull. Fac. Agric. Hirosaki Univ. 7: 66–98.Google Scholar
  6. MÜLLER, H.J. (1957): Die Wirkung exogener Faktoren auf die zyklische Formenbildung der Insekten, insbesondere der Gattung Euscelis. Zool. Jb. Syst. 85: 317–430.Google Scholar
  7. SAUER, K.P. (1970): Zur Monotopbindung einheimischer Arten der Gattung Panorpa (Mecoptera) nach Untersuchungen im Freiland und im Laboratorium. Zool. Jb. Syst. Bd. 97: 201–284.Google Scholar

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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