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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Comp+Physiol+B
2015 ; 185
(8
): 931-9
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How to spend the summer? Free-living dormice (Glis glis) can hibernate for 11
months in non-reproductive years
#MMPMID26293446
Hoelzl F
; Bieber C
; Cornils JS
; Gerritsmann H
; Stalder GL
; Walzer C
; Ruf T
J Comp Physiol B
2015[Dec]; 185
(8
): 931-9
PMID26293446
show ga
Edible dormice are arboreal rodents adapted to yearly fluctuations in seed
production of European beech, a major food source for this species. In years of
low beech seed abundance, dormice skip reproduction and non-reproductive dormice
fed ad libitum in captivity can display summer dormancy in addition to winter
hibernation. To test whether summer dormancy, that is, a very early onset of
hibernation, actually occurs in free-living dormice, we monitored core body
temperature (Tb) over ~12 months in 17 animals during a year of beech seeding
failure in the Vienna Woods. We found that 8 out of 17 dormice indeed re-entered
hibernation as early as in June/July, with five of them having extreme
hibernation durations of 11 months or more (total range: 7.8-11.4 months). Thus,
we show for the first time that a free-living mammal relying on natural food
resources can continuously hibernate for >11 months. Early onset of hibernation
was associated with high body mass in the spring, but the distribution of
hibernation onset was bimodal with prolonged hibernation starting either early
(prior to July 28) or late (after August 30). This could not be explained by
differences in body mass alone. Animals with a late hibernation onset continued
to maintain high nocturnal Tb's throughout summer but used short, shallow torpor
bouts (mean duration 7.44 ± 0.9 h), as well as occasional multiday torpor for up
to 161 h.