Exogene und endogene Steuerung der Fortpflanzungsaktivität bei männlichen Ruineneidechsen

(Lacerta sicula campestris Betta)
  • Klaus Fischer
Chapter
Part of the Journal of Neuro-Visceral Relations book series (NEURAL SUPPL, volume 10)

Summary

  1. 1.

    The function of the gonads has been studied in male lizards (Lacerta sicula campestris Betta) obtained from Bologna, Italy. The animals were kept at room temperature and were exposed to the normal seasonal variations of day and night (Göttingen, Germany: φ = 51,32°). Under these conditions there is an annual reproductive cycle. From the middle of March to the end of June to the beginning of July there is a phase of spermiohistogenetic activity (progressive phase). The mature spermatozoa are expelled from the seminal tubules at some time from May up to July; the progressive phase then comes to an end and the testes collapse (regressive phase). From June–August onwards the germinal epithelium begins to prepare for the reproductive period in the following spring, and there is a proliferation of spermatogonia (regenerative phase; refractory-period). During hibernation, which starts early in October, there is a cessation of activity, involving both the proliferation of spermatogonia, and the transformation of the products of their division into spermatocytes I. and II. In the following spring, as soon as hibernation is ended, there is a rapid resumption of spermiohistogenesis.

     
  2. 2.

    From experiments and related hypotheses, an attempt is made to explain how certain factors control the course of events in the reproductive system, so that spermiohistogenesis occurs at a particular season of the year. These factors include exposure to light for short or for long periods, raising or lowering the temperature, and endogenous factors.

     
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Copyright information

© Springer-Verlag Wien 1971

Authors and Affiliations

  • Klaus Fischer
    • 1
  1. 1.I. Zoologisches InstitutUniversität GöttingenDeutschland

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