Relationship of light intensity and photoperiod to circannual rhythmicity in the hibernating ground squirrel, Citellus lateralis.
D000818:Animals; D001835:Body Weight; D002940:Circadian Rhythm; D006605:Hibernation; D008027:Light; D010507:Periodicity; D012377:Rodentia / Q000502:physiology*; D012589:Sciuridae / Q000502:physiology*; D012621:Seasons; D013696:Temperature; D013997:Time Factors