Biology 3601A/B Lecture Notes - Lecture 19: Temperature Data Logger, Pygmy Possum, Torpor
12 Nov 2018
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Why is winter a problem for endotherms: colder need to expend more energy to maintain body temp. Limited food availability: also, higher predation risk. Ictodemys tridecemlineatus: krogh model hibernator, good sized organism ~200g, can be easily caught, can be bred in the lab. Found in michigan and manitoba, not in ontario: colony here at western. Phases of hibernation *definitely will be an exam q know and understand. Time v. core body temp: measured via a temperature data logger inside the animal, measuring interior temperatures. Interbout euthermia peaks of raised body temp when out of torpor: during torpor mr is suppressed by about 90% Figure: body temp relative to mr, when mr drops, it drops very quickly, this occurs when body temp is pretty warm. Mitochondrial metabolism is suppressed during torpor: a lot of this suppressio(cid:374) of m (cid:272)a(cid:374) (cid:271)e attri(cid:271)uted to the (cid:862)tur(cid:374)i(cid:374)g do(cid:449)(cid:374)(cid:863) of (cid:373)ito(cid:272)ho(cid:374)dria.
