𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Seasonal pattern and energetics of short daily torpor in the Djungarian hamster,Phodopus sungorus

✍ Scribed by Gerhard Heldmaier; Stephan Steinlechner

Publisher
Springer-Verlag
Year
1981
Tongue
English
Weight
638 KB
Volume
48
Category
Article
ISSN
0029-8549

No coin nor oath required. For personal study only.

✦ Synopsis

In Phodopus sungorus spontaneous shallow daily torpor occurred only during winter. Frequency of torpor was not affected by low ambient temperature but the seasonal cueing seems primarily dependent on photoperiodic control. Maximum torpor frequency was found in January with 30% of all hamsters living inside or outside being torpid at a time. It is calculated that torpor will reduce long term energy requirements of Phodopus by only 5%. Therefore it is concluded that torpor is not primarily aimed to reduce energy requirements but to guarantee survival of a fraction of a population during short periods of extreme cold load or inaccessability of food.

πŸ“œ SIMILAR VOLUMES

Daily torpor in the Djungarian hamster (
Daily torpor in the Djungarian hamster (Phodopus sungorus): photoperiodic regulation, characteristics and circadian organization
✍ R. Kirsch; A. Ouarour; P. PΓ©vet πŸ“‚ Article πŸ“… 1991 πŸ› Springer 🌐 English βš– 704 KB

1. The daily torpor was measured by oxygen uptake in Djungarian hamsters during adaptation to a short photoperiod (SP: 10L, 14D) at 20 degrees C. In these constant conditions the torpor presented metabolic characteristics and a daily time course independent of the duration of adaptations to SP. 2. T

Molting in the Djungarian hamster (Phodo
Molting in the Djungarian hamster (Phodopus sungorus Pallas): Seasonal or continuous process?
✍ Kuhlmann, Michael T. ;Clemen, GοΏ½nter ;Schlatt, Stefan πŸ“‚ Article πŸ“… 2003 πŸ› John Wiley and Sons 🌐 English βš– 485 KB

## Abstract After transfer into a short daylight regimen, the brownish summer pelage of the Djungarian hamster (__Phodopus sungorus__) changes into the whitish winter phenotype. Although changes in serum prolactin levels are identified as the initiating hormonal signal, morphological data about mol