Zusammenfassung
1. Gemischte Gruppen von Zebrafinken werden unter folgenden Bedingungen zwei Monate lang gehalten: a) Langtag ohne Wasser (Lt — D), b) Langtag mit Trinkwasser (Lt — K), c) Kurztag ohne Wasser (Kt — D), d) Kurztag mit Trinkwasser (Kt — K).
2. Zu Versuchsende war im Aussehen und allgemeinen Körperzustand zwischen den Gruppen kein Unterschied zu erkennen, außer daß die beiden D-Gruppen weniger Unterhautfett aufwiesen.
3. Bei den ♂ war zwischen den Gruppen bzgl. der Gonaden kein Unterschied festzustellen. Unter allen Bedingungen wiesen sie voll reife Hoden auf.
4. Bei den ♀ war ebenfalls kein Einfluß durch Tageslänge oder Durst an den Gonaden zu erkennen. Alle Gruppen hatten Ovarien in „halbentwickeltem Ruhezustand“.
5. Die Schilddrüsen beider Lt-Gruppen waren mäßig stimuliert. Die D-Gruppe hatte größere Drüsen mit weniger Kolloid, setzte also mehr Thyroxin um.
6. Die Besonderheiten in der Regulierung der Brutperiodik beim Zebrafinken werden ausführlich diskutiert.
Summary
1. Mixed groups of male and female Zebra Finches were kept under the following conditions: a) long days without water (Lt — D), b) long days with water (Lt — K), c) short days without water (Kt — D), d) short days with water (Kt — K).
2. At the end of the experiment, there was no difference in appearance and in the general physical conditions except in the presence of less amount of cuteaneous fat in the two D-groups.
3. There was no difference between the groups with regard to the gonads in the males. They all had fully mature testes under all conditions.
4. In the females, there was also no influence of day-length or thirst to be seen in the gonads. All groups had ovaries in a “half-developed resting-state“.
5. In both Lt-groups, the thyroids were slightly stimulated. In the D-group, there were larger thyroids with a lesser amount of colloids in them, indicating a greater turnover of thyroxine.
6. The particulars in the regulation of the breeding-periodicity in the Zebra Finch are discussed in detail.
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Sossinka, R. Der Einfluß von Durstperioden auf die Schilddrüsen- und Gonadenaktivität und ihre Bedeutung für die Brutperiodik des Zebrafinken (Taeniopygia castanotis Gould). J Ornithol 115, 128–141 (1974). https://doi.org/10.1007/BF01643286
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DOI: https://doi.org/10.1007/BF01643286