von tail__ » 21. Jan 2009 10:23
I doubt that Central European ants really NEED 4-6 months of hibernation. Sometimes they have to sleep so long because in their natural habitat the temperature is too low for activity, but it doesn't mean they will not be happy with shorter winter time. Anyway the same Lasius niger can be found in Moscow and Paris, and sometimes even in some highland areas in North Africa, where the winter time is totally different, and so their hibernation time varies. They need only some minimum time to turn on their season cycle program, as the queens usually stop or slow laying eggs in autumn and need hibernation to reactivate. I usually give my ants 2 months, plus a few weeks of cooler temperature (ca.15C) before.
I observed my Myrmica (probably rubra) colony, unlike all other species, doesn't slow colony development in winter at all. However, I still put them into the fridge to simulate season cycle in natural habitat.