Nonphotic Entrainment in a Diurnal Mammal, the European Ground Squirrel (Spermophilus citellus)
نویسندگان
چکیده
منابع مشابه
Nonphotic entrainment in a diurnal mammal, the European ground squirrel (Spermophilus citellus).
Entrainment by nonphotic, activity-inducing stimuli has been investigated in detail in nocturnal rodents, but little is known about nonphotic entrainment in diurnal animals. Comparative studies would offer the opportunity to distinguish between two possibilities. (1) If nonphotic phase shifts depend on the phase of the activity cycle, the phase response curve (PRC) should be about 180 degrees o...
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Observational data collected in the field and in enclosures show that diurnal, burrow-dwelling European ground squirrels (Spermophilus citellus) never were above ground during twilight at dawn or at dusk. The animals emerged on average 4.02 h (SD = 0.45) after civil twilight at dawn and retreated in their burrows on average 2.87 h (SD = 0.47) before civil twilight at dusk. Daily patterns of lig...
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The study describes the daily activity of the European ground squirrel in an experimental plot, situated in a heavily grazed pasture near the town of Knezha, Northwestern Bulgaria. Above ground activity was recorded with a visual scanning procedure in summer and autumn of 2006. In summer animals emerged on an average 1.94 h after the civil twilight at dawn and the active period lasted about 11 ...
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ژورنال
عنوان ژورنال: Journal of Biological Rhythms
سال: 1999
ISSN: 0748-7304,1552-4531
DOI: 10.1177/074873099129000812