Natural entrainment without dawn and dusk: The case of the European ground squirrel (Spermophilus citellus)

Journal of Biological Rhythms

Volumn 14, Issue 4, 1999, Pages 290-299

  Hut, Roelof A ^a   Van Oort, Bob E H ^b   Daan, Serge ^a  

^a UNIVERSITY OF GRONINGEN   (Netherlands)

^b UNIVERSITY OF TROMSØ   (Norway)

Author keywords

Activity pattern; Burrow; Circadian system; Diurnal; Light sensitive telemetry; Sunlight; Twilight; Zeitgeber

Indexed keywords

ANIMALIA; CITELLUS; MAMMALIA; SCIURIDAE; SPERMOPHILUS CITELLUS;

EID: 0033181195     PISSN: 07487304     EISSN: None     Source Type: Journal    
DOI: 10.1177/074873099129000704     Document Type: Article

References (23)

1. Amir S and Steward J (1996) Resetting of the circadian clock by a conditioned stimulus. Nature 379:542-545.
2. Beersma DGM, Daan S, and Hut RA (1999) Accuracy of cir-cadian entrainment under fluctuating light conditions: Contributions of phase and period responses. J Biol Rhythms 14:320-329.
3. Boulos Z, Macchi M, and Terman M (1996a) Effects of twilights on circadian entrainment patterns and reentrainment rates in squirrel monkeys. J Comp Physiol A 179:687-694.
4. Boulos Z, Macchi M, and Terman M (1996b) Twilight transitions promote circadian entrainment to lengthening light-dark cycles. Am J Physiol 271:R813-R818.
5. Daan S and Aschoff J (1975) Circadian rhythms of locomotor activity in captive birds and mammals: Their variations with season and latitude. Oecologia 18:269-316.
6. De Groot MHM and Rusak B (1998) Responses of rat and hamster circadian systems to conditioned and unconditioned stimuli. Sixth meeting Society for Research on Biological Rhythms, Abstract 183, Amelia Island, Jacksonville, USA.
7. DeCoursey PJ (1986) Light-sampling behavior in photoentrainment of a rodent circadian rhythm. J Comp Physiol A 159:161-169.
8. DeCoursey PJ (1989) Photoentrainment of circadian rhythms: An ecologist's viewpoint. In Circadian Clocks and Ecology, T Hiroshige and K Honma, eds, pp 187-206, Hokkaido University Press, Sapporo, Japan.
9. Hut RA and Scharff A (1998) Endoscopic observations on tunnel blocking behaviour in the European ground squirrel (Spermophilus citellus). Z Säugetierkunde 63:377-380.
10. Kenagy GJ, Sharbaugh SM, and Nagy KA (1989) Annual cycle of energy and time expenditure in a goldenmantled ground squirrel population. Oecologia 78: 269-282.
11. Krüll F, Demmelmeyer H, and Remmert H (1985) On the circadian rhythm of animals in high polar latitudes. Naturwissenschaften 72:197-203.
12. Millesi E, Strijkstra AM, Hoffmann IE, Dittami JP, and Daan S (1999) Sex and age difference in mass, morphology, and annual cycle in European ground squirrels, Spermophilus citellus. J Mammol 80:218-231.
13. Nelson RJ and Zucker I (1981) Absence of extraocular photoreception in diumal and nocturnal rodents exposed to direct sunlight. Comp Biochem Physiol 69A:145-148.
14. Pittendrigh CS (1981) Circadian systems: Entrainment. In Handbook of Behavioral Neurobiology, vol. 4, Biological Rhythms, J Aschoff, ed, pp 95-124, Plenum, New York.
15. Pittendrigh CS and Daan S (1976) A functional analysis of circadian pacemakers in nocturnal rodents. IV. Entrainment: Pacemaker as clock. J Comp Physiol A 106:291-331.
16. Pohl H (1998) Temperature cycles as zeitgeber for the circadian clock of two burrowing rodents, the normothermic antelope ground squirrel and the heterothermic Syrian hamster. Biol Rhythms Res 29:311-325.
17. Rajaratnam SMW and Redman JR (1998) Entrainment of activity rhythms to temperature cycles in diurnal palm squirrels. Physiol Behav 63:271-277.
18. Roenneberg T and Foster RG (1997) Twilight times: Light and the circadian system. Photochem Photobiol 66:549-561.
19. Savides TJ, Messin S, Senger C, and Kripe DF (1986) Natural light exposure of young adults. Physiol Behav 38:571-574.
20. Schooley RL, Horne BV, and Burnham KP (1993) Passive integrated transponders for marking free-ranging Townsend's ground squirrels. J Mamm 74:480-484.
21. Von Schantz M, Argamaso-Hernan S, Szél A, and Foster RG (1997) Photopigments and photoentrainment in the Syrian golden hamster. Brain Res 770:131-138.
22. Voûte AM, Sluiter JW, and Grimm MP (1974) The influence of the natural light-dark cycle on the activity rhythm of pond bats (Myotis dasycneme Boie, 1825) during summer. Oecologia (Berl) 17:221-243.
23. Wever R (1967) Zum Einfluß der Dämmerung auf die circadiane Periodik. Z verl Physiol 55:255-277.