Daily rhythmicity and hibernation in the Anatolian ground squirrel under natural and laboratory conditions.
We studied daily rhythmicity of body temperature (T(b)) before and during hibernation in Anatolian ground squirrels (Spermophilus xanthoprymnus) under natural and laboratory conditions using surgically implanted temperature loggers. Under both conditions, robust daily T(b) rhythmicity with parameters comparable to those of other ground squirrel species was observed before but not during hibernation. Euthermic animals had robust daily T(b) rhythms with a mean of 37.0 degrees C and a range of excursion of approximately 4 degrees C. No T(b) rhythm was detected during torpor bouts, either because T(b) rhythmicity was absent or because the daily range of excursion was smaller than 0.2 degrees C. The general patterns of hibernation that we observed in Anatolian ground squirrels were similar to those previously observed by other investigators in other species of ground squirrels.
Kart Gür
Mutlu
M
Department of Biology, Faculty of Science, Hacettepe University, Beytepe 06800, Ankara, Turkey.
Refinetti
Roberto
R
Gür
Hakan
H
D000818:Animals; D001831:Body Temperature; D002940:Circadian Rhythm / Q000502:physiology*; D006605:Hibernation / Q000502:physiology*; D012589:Sciuridae / Q000502:physiology*; D013686:Telemetry; D014421:Turkey
Oecologia. 1992 Mar;89(3):397-406
28313089
J Comp Physiol B. 1998 Dec;168(8):631-8
9871346
Ann N Y Acad Sci. 2005 Jun;1048:60-8
16154921
J Exp Zool. 1996 May 1;275(1):67-70
8708632
Annu Rev Physiol. 2004;66:239-74
14977403
Naturwissenschaften. 2007 Jun;94(6):483-7
17252241
Am J Physiol Regul Integr Comp Physiol. 2002 Apr;282(4):R1086-95
11893613
Chronobiologia. 1979 Oct-Dec;6(4):305-23
548245
J Biol Rhythms. 2003 Aug;18(4):275-86
12932080
J Theor Biol. 2004 Apr 21;227(4):571-81
15038991
Chronobiol Int. 2000 Mar;17(2):103-28
10757457
J Comp Physiol B. 2002 Jan;172(1):47-58
11824403
J Neurosci. 2002 Jan 1;22(1):357-64
11756519
Biol Rhythm Res. 2007;38(4):275-325
23710111
Oecologia. 1990 Jul;83(4):504-511
28313184
J Comp Physiol B. 1997 May;167(4):270-9
9203368
Mol Phylogenet Evol. 2007 Jun;43(3):916-35
17500011
Am J Physiol. 1994 Apr;266(4 Pt 2):R1251-8
8184969
J Comp Physiol B. 1995;165(3):171-82
7665733