Two-step photoperiodic and hormonal control of reproduction in the female beetle, Pterostichus nigrita |
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Authors: | Hans-Jörg Ferenz |
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Affiliation: | Zoologisches Institut der Universität Köln, Lehrstuhl für Physiologische Ökologie. Weyertal 119, 5000 Köln 41, Federal Republic of Germany |
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Abstract: | The carabid P. nigrita is a short-day/long-day insect. Short days with less than 15.0 hr of light per day induce pre-vitellogenesis. Vitellogenesis only takes place in subsequent long days with more than 13,1 hr of light. In the range from ld 13:11 to ld 16:8 egg production is possible without a change in photoperiod. Pre-vitellogenesis is induced by the corpus allatum hormone. Implantation of active corpora allata or injection of juvenile hormone substitutes for short-day photoperiods. Histological investigations and implantation experiments revealed that for vitellogenesis some neurosecretion is necessary. Ecdysterone cannot replace this neurosecretion. |
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