Abstract：
:The Mashona mole rat, Cryptomys darlingi, is a social, subterranean African rodent that is rarely, if ever, exposed to light, and that exhibits a regressed visual system. This study investigated locomotor activity patterns of Mashona mole rats (n=12) under different light cycles. Activity was measured using either infrared captors (n=8) or running wheels (n=4). The mole rats entrained their activity to a standard (LD 12:12) photoperiod. They displayed either a nocturnal or diurnal activity preference with one bout of activity and one bout of rest. Therefore, as a species, the Mashona mole rat did not show a clear nocturnal or diurnal activity preference. When the LD (12:12) light cycle was inversed, the animals switched their activity, too. Under constant dark (DD), most mole rats (73%) showed a free-running circadian activity rhythm, but under constant light (LL), only some (36%) did. The free-run period of the rhythm (tau) ranged from 23.83 to 24.10 h. The remaining animals were arrhythmic. There was large interindividual and intraindividual variations in the rate and extent of entrainment, time of activity preference, and activity patterns. Possible reasons for the observed variations are discussed. It is concluded that the Mashona mole rat has an endogenous activity rhythm which approximates 24 h, that the mole rat can distinguish between light and dark, and that the endogenous clock utilises this photic information as a zeitgeber.
journal_name
Physiol Behavjournal_title
Physiology & behaviorauthors
Vasicek CA,Oosthuizen MK,Cooper HM,Bennett NCdoi
10.1016/j.physbeh.2004.11.005subject
Has Abstractpub_date
2005-02-15 00:00:00pages
181-91issue
2eissn
0031-9384issn
1873-507Xpii
S0031-9384(04)00478-0journal_volume
84pub_type
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journal_title：Physiology & behavior
pub_type： 临床试验,杂志文章
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journal_title：Physiology & behavior
pub_type： 杂志文章,评审
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更新日期：1991-05-01 00:00:00
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pub_type： 杂志文章
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更新日期：2009-08-04 00:00:00
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1989-02-01 00:00:00
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