Hi Uta,
the Temnotorax nylanderi need hibernate. We give warranty that a queen is contained in the colony. If there is more, then it's luck.
T. nylanderi is monogynous, see here:
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In a few colonies more than one dealate gyne may be found, usually in the fall and until early spring. In these instances a couple of unmated gynes have dealated and remain in the nest over winter. Sometimes there are only such virgins and no mated, egg-laying queen. So, to get a colony with 2 or more gynes isn't luck, but risk!
They need 5-6 months hibernation at temperatures below 10 C. If kept too warm during the summer, i.e. in constant room temperature (20-25 C) the development is too fast, so that the next hibernation must begin much earlier than in October. In nature they have a lot of cool nights even in the summer which reduce the speed of colony and brood development.
It's true that they need only very small formicaries: 10 x 10 cm x 3 cm hight is sufficient. But provide different soil and air humidities within the formicary, a humidity gradient! In the field they settle at densities of up to 10, 20 or even 30 colonies on one single square metre!
Buschinger, A. 1967: Verbreitung und Auswirkungen von Mono- und Polygynie bei Arten der Gattung Leptothorax MAYR (Hymenoptera, Formicidae). Inaugural-Dissertation, Würzburg, 114 p.
Buschinger, A. 1968: Mono- und Polygynie bei Arten der Gattung Leptothorax Mayr (Hymenoptera Formicidae). Insectes Sociaux 15, 217-226.
Regards,
Earlant